Title page

Nortel Communication Server 1000

Nortel Communication Server 1000 Release 4.5

ISDN Primary Rate Interface

Installation and Configuration
Document Number: 553-3001-201
Document Release: Standard 3.00
Date: August 2005

Year Publish FCC TM

Copyright © Nortel Networks Limited 2005
All Rights Reserved

Produced in Canada

Information is subject to change without notice. Nortel Networks reserves the right to make changes in design
or components as progress in engineering and manufacturing may warrant.

Nortel, Nortel (Logo), the Globemark, This is the Way, This is Nortel (Design mark), SL-1, Meridian 1, and
Succession are trademarks of Nortel Networks.
4

Page 3 of 396

Revision history
August 2005
Standard 3.00. This document is up-issued to support Communication
Server 1000 Release 4.5.

September 2004
Standard 2.00. This document is up-issued for Communication Server 1000
Release 4.0.

October 2003
Standard 1.00. This document is a new NTP for Succession 3.0. It was created
to support a restructuring of the Documentation Library, which resulted in the
merging of multiple legacy NTPs. This new document consolidates
information previously contained in the following legacy documents, now
retired:
• ISDN Primary Rate Interface: Installation (553-2901-201)
• 1.5Mb DTI/PRI: Description, Installation and Maintenance (553-3011-
310) (Content from 1.5Mb DTI/PRI: Description, Installation and
Maintenance (553-3011-310) also appears in ISDN Primary Rate
Interface: Maintenance (553-3001-517).)
• 2.0Mb DTI/PRI: Description, Installation and Maintenance (553-3011-
315) (Content from 2.0Mb DTI/PRI: Description, Installation and
Maintenance (553-3011-315) also appears in ISDN Primary Rate
Interface: Maintenance (553-3001-517).)

ISDN Primary Rate Interface Installation and Configuration

Page 4 of 396 Revision history

553-3001-201 Standard 3.00 August 2005

10

Page 5 of 396

Contents
List of procedures . . . . . . . . . . . . . . . . . . . . . . . . . . 11

About this document . . . . . . . . . . . . . . . . . . . . . . . 15

Subject .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Applicable systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Intended audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Related information .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
How to get Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

ISDN Primary Rate Interface

equipment overview . . . . . . . . . . . . . . . . . . . . . . . . 19
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Primary Rate Interface (PRI) hardware requirements .. . . . . . . . . . . . . 21
ISDN Signaling Link (ISL) hardware . . . . . . . . . . . . . . . . . . . . . . . . . . 23
D-Channel Handler description .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
NT6D11 DCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
QPC757 DCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
NT6D80 MSDL .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
NTBK51 Downloadable D-Channel Daughterboard . . . . . . . . . . . . . . 32
Standard PRI cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
NT8D72 PRI2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
QPC720 PRI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

ISDN Primary Rate Interface Installation and Configuration

Page 6 of 396 Contents

Disk drive hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

NT5D97 Dual-port DTI2/PRI2 card .. . . . . . . . . . . . . . . . . . . . . . . . . . 44
NT5D12 Dual-port DTI/PRI .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

DCH installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103
Install the NT6D11AB, NT6D11AE, NT6D11AF DCH . . . . . . . . . . . 103
Set up the NT6D11AB, NT6D11AE, NT6D11AF DCHI . . . . . . . . . . 104
Install the NT6D11AB, NT6D11AE, NT6D11AF DCHI . . . . . . . . . . 112
Remove the NT6D11AB, NT6D11AE, NT6D11AF DCH . . . . . . . . . 113
Install the QPC757 DCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

NTBK51 DDCH installation and removal . . . . . . . 119

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Introduction .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Install NTBK51 DDCH on NT5D97 dual-port DTI2/PRI2 card . . . . . 120
Remove NTBK51 DDCH from NT5D97 dual-port
DTI2/PRI2 card .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Install NTBK51 DDCH on NT5D12 dual-port DTI/PRI . . . . . . . . . . . 121
Remove NTBK51 DDCH from NT5D12 dual-port DTI/PRI . . . . . . . 122

MSDL installation for all systems . . . . . . . . . . . . . 125

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Install the MSDL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Replace the MSDL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

NT8D72 and QPC720 PRI card installation . . . . . 131

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Introduction .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
PRI circuit pack locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151

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 Contents Page 7 of 396

Install NT8D72 and QPC720 PRI cards on Large Systems . . . . . . . . . 154

Remove NT8D72 and QPC720 PRI cards from Large Systems .. . . . . 156
Install an additional network shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

NT5D97 Dual-port DTI2/PRI2

installation and removal . . . . . . . . . . . . . . . . . . . . . 159
Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
NT5D97 circuit card locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Port definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Case Scenarios for replacing a digital trunk NT8D72BA, QPC536E, or
NTCK43 by a DDP2 card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
NT5D97AA/AB DIP switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . 161
NT5D97AD DIP switch settings .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 168
Install the NT5D97 DDP2 .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Remove the NT5D97 DDP2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Configure the NT5D97 DDP2 .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

NT5D12 Dual-port DTI/PRI card installation . . . . . 179

Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
NT5D12 circuit card locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Port definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Scenarios for replacement of a digital trunk card (QPC720/QPC472)
by a DDP card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
NT5D12 switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Install the NT5D12 DDP .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Remove the NT5D12 DDP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Configure the NT5D12 DDP .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Clock Controller description and installation . . . . 193

Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

ISDN Primary Rate Interface Installation and Configuration

Page 8 of 396 Contents

Introduction .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Installation procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

ISL installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
ISL configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
DCHI switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
MSDL switch settings .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
Shared mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Dedicated mode using leased line .. . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Dedicated mode using dial-up modem . . . . . . . . . . . . . . . . . . . . . . . . . 227
ISL installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234

Echo canceller installation . . . . . . . . . . . . . . . . . . 237

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
Introduction .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
Echo canceller operating parameters . . . . . . . . . . . . . . . . . . . . . . . . . . 237
Echo canceller initialization procedures . . . . . . . . . . . . . . . . . . . . . . . . 238
PRI to Echo canceller pin assignments .. . . . . . . . . . . . . . . . . . . . . . . . 238
Electromagnetic Interference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

1.5 Mb PRI implementation . . . . . . . . . . . . . . . . . . 241

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Overview .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Hardware requirements .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Install PRI hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254

1.5 Mb DTI implementation . . . . . . . . . . . . . . . . . . 275

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
Overview .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275

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 Contents Page 9 of 396

Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276

Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
Install DTI hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
Software enable the DTI/PRI cards .. . . . . . . . . . . . . . . . . . . . . . . . . . . 278

1.5 Mb ISL implementation . . . . . . . . . . . . . . . . . . . 285

Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Basic ISL implementation .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

2.0 Mb DTI implementation . . . . . . . . . . . . . . . . . . . 301

Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
NTAK10 2.0 Mb DTI card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
Install DTI hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
DTI software implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

2.0 Mb PRI implementation . . . . . . . . . . . . . . . . . . . 333

Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333
Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334
Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
Install the NTAK79 PRI card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339
Install the NTBK50 PRI card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
PRI software implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356

2.0 Mb ISL implementation . . . . . . . . . . . . . . . . . . . 371

Contents .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
ISL hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372

ISDN Primary Rate Interface Installation and Configuration

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ISL hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375

ISL software implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376

Non-standard cables . . . . . . . . . . . . . . . . . . . . . . . 385

Contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385
Introduction .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386
NT5K40AA, NT5K41AA, NT5K86AA . . . . . . . . . . . . . . . . . . . . . . . 386
NT8D7206, NT8D7207 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
QCAD128 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
QCAD129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388
QCAD133 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389
NT8D7205 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390
QCAD328 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391
NT8D74 Clock Controller to InterGroup cable . . . . . . . . . . . . . . . . . . 392
NT8D75 Clock Controller to Clock Controller cable .. . . . . . . . . . . . . 393
NT8D79 PRI/DTI to Clock Controller cable . . . . . . . . . . . . . . . . . . . . 393
NT8D83 PRI/DTI to I/O cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393
NT8D85 Network to IPE cable .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
NT8D86 Network to I/O cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
NT8D97AX PRI/DTI I/O to MDF cable . . . . . . . . . . . . . . . . . . . . . . . 395
NT9J93AD PRI/DTI Echo Canceller to I/O cable . . . . . . . . . . . . . . . . 395
NTND26 PRI to MSDL cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395
NTND27 MSDL to I/O panel cables . . . . . . . . . . . . . . . . . . . . . . . . . . 395
NTND98 PRI to I/O panel cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396

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List of procedures
Procedure 1
Install the NT6D11AB, NT6D11AE, NT6D11AF DCH . . . 112

Procedure 2
Remove the NT6D11AB, NT6D11AE, NT6D11AF DCH . 113

Procedure 3
Install the QPC757 DCHI . . . . . . . . . . . . . . . . . . . . . . . . . 114

Procedure 4
Remove the QPC757 DCH . . . . . . . . . . . . . . . . . . . . . . . 118

Procedure 5
Install the NTBK51 on the NT5D97 dual-port
DTI2/PRI2 card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120
Procedure 6
Remove the NTBK51 from the NT5D97 dual-port
DTI2/PRI2 card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
Procedure 7
Install the NTBK51 DDCH on the NT5D12
dual-port DTI/PRI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 122
Procedure 8
Remove the NTBK51 from the NT5D12
dual-port DTI/PRI card . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Procedure 9
Install the MSDL card . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

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Procedure 10
Replace the MSDL card . . . . . . . . . . . . . . . . . . . . . . . . . 129
Procedure 11
Install the NT8D72 and QPC720 PRI
on Large Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155
Procedure 12
Remove NT8D72 and QPC720 PRI cards
from Large Systems . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156
Procedure 13
Install an additional network shelf on Half Group
and Single Group systems . . . . . . . . . . . . . . . . . . . . . . . 157

Procedure 14
Install the NT5D97 on Large Systems . . . . . . . . . . . . . . 174

Procedure 15
Remove the NT5D97 from Large Systems . . . . . . . . . . 176

Procedure 16
Install the NT5D12 on Large Systems . . . . . . . . . . . . . . 188

Procedure 17
Remove the NT5D12 DDP . . . . . . . . . . . . . . . . . . . . . . . . 190

Procedure 18
Install a clock controller for Half Group
and Single Group Systems. . . . . . . . . . . . . . . . . . . . . . . 212

Procedure 19
Install a Clock Controller on a Single Group
and Multi Group System . . . . . . . . . . . . . . . . . . . . . . . . . 214

Procedure 20
Remove old equipment . . . . . . . . . . . . . . . . . . . . . . . . . . 216

Procedure 21
Installing new equipment . . . . . . . . . . . . . . . . . . . . . . . . 217

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 List of procedures Page 13 of 396

Procedure 22
Install ISL in dedicated mode . . . . . . . . . . . . . . . . . . . . . 234
Procedure 23
Install ISL in shared mode . . . . . . . . . . . . . . . . . . . . . . . 235

Procedure 24
Mounting the NTAK20 daughterboard
on the NTRB21 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254

Procedure 25
Inserting the NTRB21 TMDI card . . . . . . . . . . . . . . . . . . 256

Procedure 26
Removing the NTRB21 TMDI card . . . . . . . . . . . . . . . . . 257

Procedure 27
Mounting the daughterboards on the NTAK09 . . . . . . . 257

Procedure 28
Removing the daughterboards from the NTAK09 . . . . 258
Procedure 29
Installing the NTAK09 . . . . . . . . . . . . . . . . . . . . . . . . . . . 260

Procedure 30
Connecting the cables . . . . . . . . . . . . . . . . . . . . . . . . . . 261

Procedure 31
Enabling the NTRB21 TMDI card . . . . . . . . . . . . . . . . . . 262
Procedure 32
Enabling the NTAK09 DTI/PRI card . . . . . . . . . . . . . . . . 263

Procedure 33
Implementing basic PRI . . . . . . . . . . . . . . . . . . . . . . . . . 264

Procedure 34
Enabling the NTRB21 TMDI card . . . . . . . . . . . . . . . . . . 278

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Procedure 35
Enabling the NTAK09 card . . . . . . . . . . . . . . . . . . . . . . . 279
Procedure 36
Implementing DTI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280

Procedure 37
Installing ISL hardware . . . . . . . . . . . . . . . . . . . . . . . . . . 289

Procedure 38
Implementing dedicated mode . . . . . . . . . . . . . . . . . . . 292
Procedure 39
Connecting the cables . . . . . . . . . . . . . . . . . . . . . . . . . . 307

Procedure 40
Connecting the cables . . . . . . . . . . . . . . . . . . . . . . . . . . 344

Procedure 41
Inspecting the NTBK50 circuit card . . . . . . . . . . . . . . . 347

Procedure 42
Installing the NTAK02 . . . . . . . . . . . . . . . . . . . . . . . . . . . 375

Procedure 43
Setting up the D-channel . . . . . . . . . . . . . . . . . . . . . . . . 376

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Page 15 of 396

About this document

This document is a global document. Contact your system supplier or your
Nortel representative to verify that the hardware and software described are
supported in your area.

Subject
Note on legacy products and releases
This NTP contains information about systems, components, and features that
are compatible with Nortel Communication Server 1000 Release 4.5
software. For more information on legacy products and releases, click the
Technical Documentation link under Support & Training on the Nortel
home page:
www.nortel.com

Applicable systems
This document applies to the following systems:
• Communication Server 1000S (CS 1000S)
• Communication Server 1000M Chassis (CS 1000M Chassis)
• Communication Server 1000M Cabinet (CS 1000M Cabinet)
• Communication Server 1000M Half Group (CS 1000M HG)
• Communication Server 1000M Single Group (CS 1000M SG)
• Communication Server 1000M Multi Group (CS 1000M MG)
• Communication Server 1000E (CS 1000E)

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Page 16 of 396 About this document

Note: When upgrading software, memory upgrades may be required on

the Signaling Server, the Call Server, or both.

System migration
When particular Meridian 1 systems are upgraded to run CS 1000
Release 4.5 software and configured to include a Signaling Server, they
become CS 1000M systems. Table 1 lists each Meridian 1 system that
supports an upgrade path to a CS 1000M system.

Table 1
Meridian 1 systems to CS 1000M systems

This Meridian 1 system... Maps to this CS 1000M system

Meridian 1 PBX 11C Chassis CS 1000M Chassis

Meridian 1 PBX 11C Cabinet CS 1000M Cabinet

Meridian 1 PBX 51C CS 1000M Half Group

Meridian 1 PBX 61C CS 1000M Single Group

Meridian 1 PBX 81 CS 1000M Multi Group

Meridian 1 PBX 81C CS 1000M Multi Group

For more information, see one or more of the following NTPs:

• Communication Server 1000M and Meridian 1: Small System Upgrade
Procedures (553-3011-258)
• Communication Server 1000M and Meridian 1: Large System Upgrade
Procedures (553-3021-258)
• Communication Server 1000S: Upgrade Procedures (553-3031-258)
• Communication Server 1000E: Upgrade Procedures (553-3041-258)

Intended audience
This document is intended for individuals responsible for installing and
configuring ISDN PRI.

553-3001-201 Standard 3.00 August 2005

 About this document Page 17 of 396

Related information
This section lists information sources that relate to this document.

NTPs
The following NTPs are referenced in this document:
• Features and Services (553-3001-306)
• Software Input/Output: Administration (553-3001-311)
• Software Input/Output: Maintenance (553-3001-511)

Online
To access Nortel documentation online, click the Technical Documentation
link under Support & Training on the Nortel home page:
www.nortel.com

CD-ROM
To obtain Nortel documentation on CD-ROM, contact your Nortel customer
representative.

How to get Help

Getting Help from the Nortel Web site

The best source of support for Nortel products is the Nortel Support Web site:
www.nortel.com/support

This site enables customers to:

• download software and related tools
• download technical documents, release notes, and product bulletins
• sign up for automatic notification of new software and documentation
• search the Support Web site and Nortel Knowledge Base
• open and manage technical support cases

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Page 18 of 396 About this document

Getting Help over the phone from a Nortel Solutions Center

If you have a Nortel support contract and cannot find the information you
require on the Nortel Support Web site, you can get help over the phone from
a Nortel Solutions Center.

In North America, call 1-800-4NORTEL (1-800-466-7865).

Outside North America, go to the Web site below and look up the phone
number that applies in your region:
www.nortel.com/callus

When you speak to the phone agent, you can reference an Express Routing
Code (ERC) to more quickly route your call to the appropriate
support specialist. To locate the ERC for your product or service, go to:
www.nortel.com/erc

Getting Help through a Nortel distributor or reseller

If you purchased a service contract for your Nortel product from a distributor
or authorized reseller, you can contact the technical support staff for that
distributor or reseller.

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ISDN Primary Rate Interface

equipment overview

Contents
The section contains information on the following topics:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Primary Rate Interface (PRI) hardware requirements. . . . . . . . . . . . . . 21
ISDN Signaling Link (ISL) hardware . . . . . . . . . . . . . . . . . . . . . . . . . . 23
64 Kbit/s Clear Data Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
D-Channel Handler description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
NT6D11 DCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
DCH/PRI interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
DCH faceplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
QPC757 DCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
DCH/PRI interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
QPC757 faceplate. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
NT6D80 MSDL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
MSDL/PRI interface. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
MSDL faceplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
NTBK51 Downloadable D-Channel Daughterboard . . . . . . . . . . . . . . 32
Standard PRI cards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
NT8D72 PRI2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

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Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
NT8D72 faceplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Carrier interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Echo canceller interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
QMT21 High Speed Data Module . . . . . . . . . . . . . . . . . . . . . . . . . . 37
QPC720 PRI for 1.5/2.0 Mb gateway . . . . . . . . . . . . . . . . . . . . . . . 37
Clock operation for the NT8D72 . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
QPC720 PRI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
QPC720 faceplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
QPC720 Cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Carrier interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Echo Canceller interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
64 T-link version 2 protocol. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Disk drive hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
NT5D97 Dual-port DTI2/PRI2 card. . . . . . . . . . . . . . . . . . . . . . . . . . . 44
External D-Channel Interface DCH or MSDL . . . . . . . . . . . . . . . . 45
NT5D97 faceplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
System capacity and performance . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Testability and diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Cable diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Clock for the NT5D97 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
NT5D12 Dual-port DTI/PRI. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
D-Channel and MSDL interface . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
NT5D12 faceplate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
System capacity and performance . . . . . . . . . . . . . . . . . . . . . . . . . . 83
Power requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84
Testability and diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
NT5D12 Cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Trunk Tip/Ring cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Reference clock cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88
MSDL/DCHI cables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Cable diagrams. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

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Reference clock errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93

Automatic clock recovery. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
Automatic clock switching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
Clock configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Introduction
This chapter describes the basic hardware needed to equip ISDN PRI on
CS 1000 and Meridian 1 systems.

Primary Rate Interface (PRI) hardware requirements

The following hardware is required to equip ISDN PRI on a Large System:
• NT6D11(AB/AE/AF) D-Channel Interface (DCH) card (for 2.0 Mb PRI)
• QPC757 D-channel Interface (DCH) for (1.5 Mb PRI)
• NT6D80 Multipurpose Serial Data Link (MSDL) card
• NTBK51 Downloadable D-Channel Daughterboard (DDCH), the
NT5D97 dual-port DTI2/PRI2 card, or the NT5D12 dual-port 1.5 Mb
DTI/PRI card
• NT8D72 (AB/BA) PRI2 card
• NT5D97 dual-port DTI2/PRI2 card
• QPC720 1.5 Mb PRI card
• NT5D12 dual-port 1.5 DTI/PRI card
• QPC775 or NTRB53 Clock Controller

Note: The NTRB53 Clock Controller cannot be combined with a

QPC775 or a QPC471 card in one system

Additional hardware is also required for PRI capability and applications.

Installation instructions are given in other Nortel publications, or supplied by
the manufacturer. This additional hardware includes:
• QPC414 Network card
• Channel Service Unit (CSU)

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• Echo canceller
• ROM circuit card requirements:
— the QPC939A for a CS 1000M HG
— the QPC939A for CS 1000M SG
Note: CS 1000M MG ROM requirements are fulfilled by the NT6D66
Call Processor (CP) card.

• QMT8 Asynchronous Data Module (ADM)

See Figure 1 for a representation of the basic PRI system hardware.

Note: Figure 1 shows a basic configuration, not the dual-port NT5D12

DTI/PRI card, nor the associated dual-port NTBK51AA Downloadable
D-Channel daughterboard.

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Figure 1
PRI hardware (shown without downloadable PRI and DCH cards)

PRIClock
PRI
Controllers

Interface to the
CEPT external digital
carrier (2Mb/s
PRI PCM carrier)
PRI DCHI
Loop

QPC414 DCHI
PRI
Network PRI
Card

553-7332

ISDN Signaling Link (ISL) hardware

The following hardware is required for ISDN Signaling Link (ISL) capability
and applications.

Equipment required for shared mode capability:

• NT6D11(AB/AE/AF) D-Channel (DCH) card (for 2.0 Mb PRI)
• QPC757 D-channel (DCH) for (1.5 Mb PRI)
• NT6D80 Multipurpose Serial Data Link (MSDL) card
• NTBK51 Downloadable D-Channel Daughterboard (DDCH), the
NT5D97 dual-port DTI2/PRI2 card, or the NT5D12 dual-port 1.5 Mb
DTI/PRI card

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• NT8D72 (AB/BA) PRI2 card

• NT5D97 dual-port DTI2/PRI2 card
• QPC720 1.5 Mb PRI card
• NT5D12 dual-port 1.5 DTI/PRI card
• QPC775 Clock Controller or NTRB53

Equipment required for dedicated mode using leased lines:

• NT6D11(AB/AE/AF) D-Channel (DCH) card (for 2.0 Mb PRI)
• QPC757 D-channel (DCH) for (1.5 Mb PRI)
• NT6D80 Multipurpose Serial Data Link (MSDL) card
• NTBK51 Downloadable D-Channel Daughterboard (DDCH), used as an
option to the NT6D80 MSDL
• modem set in synchronous mode

Equipment required for dedicated mode using a dial-up modem:

• NT6D11(AB/AE/AF) D-Channel (DCH) card (for 2.0 Mb PRI)
• QPC757 D-channel (DCH) for (1.5 Mb PRI)
• NT6D80 Multipurpose Serial Data Link (MSDL) card
• NTBK51 Downloadable D-Channel Daughterboard (DDCH), used as an
option to the NT6D80 MSDL
• modem with auto-dial capability

Note: This configuration is the least reliable due to lockup problems

inherent in Smart Modems from power spikes and noisy lines. To
increase the reliability on this configuration, use a constant power source
when powering the modems. Also, verify that TIE lines meet data grade
specifications. Nortel takes no responsibility for ISL D-Channel outages
due to modem lockup.

• 500 set line card

• QPC71 2W TIE, or QPC237 4W TIE E&M

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Equipment required for dedicated mode using a DTI/DTI2 trunk:

• NT6D11(AB/AE/AF) D-Channel (DCH) card (for 2.0 Mb PRI)
• QPC757 D-channel (DCH) for (1.5 Mb PRI)
• NT6D80 Multipurpose Serial Data Link (MSDL) card
• NTBK51 Downloadable D-Channel Daughterboard (DDCH), used as an
option to the NT6D80 MSDL
• NT5D97 dual-port DTI2/PRI2 card
• QPC472 1.5 Mb DTI card or NT5D12 dual-port 1.5 DTI/PRI card
• QMT8 Asynchronous Data Module (ADM), QMT11
Asynchronous/Synchronous Interface Module (ASIM) or QMT21 High
Speed Data Module (HSDM)
• Data line card

64 Kbit/s Clear Data Hardware

The QMT21 High Speed Data Module (HSDM) is required in the clear-data
pathway to support the 64Kbit/s clear-data function. One module is required
at each system end of any connection.

D-Channel Handler description

This section provides descriptions of the D-Channel (DCH) cards, the MSDL
card, and the Downloadable D-Channel Daughterboard.

NT6D11 DCH

Power requirements
The power requirements for the NT6D11AB/11AE/AF DCH are:
• +5 volts at 3 amperes
• +12 volts at 75 milliamperes
• -12 volts at 75 milliamperes

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DCH/PRI interface
The NT6D11AB/AE/AF DCHs connect to the PRI2 cards by means of a
special RS422 cable, the QCAD328A, which is a special RS422 cable; refer
to “QCAD328” on page 391 of the Cabling chapter for more details.

DCH faceplate
NT6D11AB/AE/AF DCHs have one Light Emitting Diode (LED), to indicate
an active or inactive state, and two external connectors:
• Port J1 is a standard asynchronous port providing an interface for
non-PRI applications.
Note: This connection will not support an Add-on Data Module (ADM)
terminal.

• Port J2 is the D-Channel Interface port.

Figure 2 on page 27 shows the faceplate layout.

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Figure 2
NT6D11 DCH faceplate layout

Status LED
The DCHI LED indicates the statusof
both ports on the DCHI card. If both
ports are configured, the LED is lit only
when both ports are disabled.

J1

Asynchronous port
This port is used for non-PRA
applications. Port J1 is always an even
number(0, 2, 4, ...14).

J2

D-channel interface
This port is connected to port J5 ona
PRI card. The D-channel is always
channel 16 on a PRI2.Port J2 is always
an odd number(1, 3, 5...15).

553-7334

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QPC757 DCH

Power requirements
The power requirements for the QPC757 DCH are:
• +5 volts at 3 amperes
• +12 volts at 50 milliamperes
• –12 volts at 50 milliamperes

DCH/PRI interface
The QPC757 DCH connects to the QPC720 PRI via a RS-422 cable. The
following signals are transmitted across the interface:
• RCV DATA
• RCV CLOCK
• XMIT CLOCK
• XMIT READY
• PRI READY
• DCH READY

PRI READY and DCH READY are handshake signals.

QPC757 faceplate
The QPC757 DCH, as shown in Figure 3 on page 29 has one LED to indicate
an active or inactive state and two external connectors as follows:
• Port J1 is a standard asynchronous port in LD 48
Note: This connection does not support an Add-on Data Module (ADM)
terminal.

• Port J2 is the D-Channel Interface port.

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Note: A QPC757 vintage C is required if the ISL Revert to Conventional

Signaling feature is configured. The QPC757 vintage D is recommended
for combination ISL/PRI networks using NACD or Network Message
Services and ISL networks using modems.

Figure 3
QPC757 DCH faceplate layout

Q
Status LED
P The DCHI LED indicates the status of both
C ports on the DCHI card.
7
If both ports are configured, the LED is lit only
5 when both ports are disabled.
7
J1
Asynchronous port
This port is used for non-PRI applications.
Print the configuration record to determine how
the port is configured.
Port J1 is always an even number
(0, 2, 4, ...14).
Check the async port status with
LD48
STAT ESDI N
J2

D-channel interface
This port is connected to port J5 on a PRI card.
The D-channel is always channel 24 on a PRI.
Port J2 is always an odd number
(1, 3, 5 … 15).
Check the D-channel port status with
LD96
STAT DCHI N

553-1373

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NT6D80 MSDL
The NT6D80 MSDL card can be used in conjunction with, or independent of,
the QPC757, or NT6D11AB/AE/AF DCH.

Power requirements
The NT6D80 MSDL power requirements are:

Voltage Current Power Heat

(VAC) (Amps) (Watts) (BTUs)
+5 3.20 16.00 55.36
+12 0.10 1.20 4.15
-12 0.10 1.20 4.15

MSDL/PRI interface
MSDL can connect to PRI trunks through RS-422 or RS-232 interfaces. The
interfaces are switch configured.

MSDL faceplate
The NT6D80 MSDL has one LED to indicate an active or inactive state and
four external connectors. Each port can be RS-422 or RS-232 connectors,
with either DCE or DTE interfaces. Refer to Figure 4 on page 31.

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Figure 4
NT6D80 MSDL faceplate layout

Care Locking Device

Card Address Select Switches
Ones Tens
23 23

456

456
901

901
78 78

S9 S10
LED
DCE DTE
O1 2 3 4 5 6 7 8
N
O 1 2 3 4 5 6 7 8 9 10
N Setting for an RS-232
S4 S8 interface DTE/DCE are
Port 0 software configured

DCE DTE
Port 1
O1 2 3 4 5 6 7 8
N
O 1 2 3 4 5 6 7 8 9 10
N Setting for an RS-422
S3 S7 DTE interface

Port 2 DCE DTE

O1 2 3 4 5 6 7 8
N
O 1 2 3 4 5 6 7 8 9 10
N Setting for an RS-422
S2 S6 DCE interface

Port 3

DCE DTE
Monitor O1 2 3 4 5 6 7 8
N Setting for an RS-232
O 1 2 3 4 5 6 7 8 9 10
N

Port S1 S5 interface DTE/DCE are

software configured

I/O Port Interface

DIP switch configuration 553-AAA1102

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NTBK51 Downloadable D-Channel Daughterboard

The NTBK51 is a two port Downloadable D-Channel Daughterboard
(DDCH) that has been introduced as an option to the NT6D80 MSDL, the
NT5D97 dual-port DTI2/PRI2 card, or the NT5D12 dual-port 1.5 Mb
DTI/PRI card.

The NTBK51 supports all the features of the existing 4 port MSDL
(NT6D80), and eliminates the need for an external DCH card and associated
cables for MSDL applications. The NTBK51 can support a maximum of 32
(16*2) MSDL type D-Channels per system, unlike the MSDL which can
support a maximum of 64.

Note 1: Only one version, the NTBK51AA, can be used with the
NT5D97, or the NT5D12. The NTBK51BA version has only 30+30 pin
connectors (instead of 40+30 pins in the AA version). The missing 10
pins in the BA version prohibits the use of port 0 on the NT5D97, or
NT5D12 card.

Note 2: The software allocation for NTBK51AA DDCH is similar to the

MSDL. It is both physical and logical, and supports D-Channel
functionality only.

Note 3: Port 0 has to be an even loop on the DDP2, and Port 1 has to be
an odd loop. Port 2 and Port 3 should not be configured.

The connection between the dual-port cards and the DDCH daughterboard is
made using two headers: one 30 pin and one 40 pin connector.

Standard PRI cards

This section provides a description of the standard ISDN PRI cards, namely
the NT8D72 (AB/BA) PRI2 card, and the QPC720 1.5 Mb PRI card.

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NT8D72 PRI2

Power requirements
The NT8D72AB and NT8D72BA PRI use power and ground connections
from the backplane. Power requirements are:
+5 volts at 4 amperes

+12 volts at 50 milliamperes

-12 volts at 50 milliamperes

NT8D72 faceplate
The NT8D72 contains five LEDs and six external connectors. Figure 5 on
page 34 shows the faceplate layout.

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Figure 5
NT8D72 PRI faceplate layout

OOS: Card is out of service

ACT: Card is enabled
LOCAL: Local alarm - local card or transmission fault
RAI: Remote alarm - far end fault
LBK: Loop -back test - see PRI tests

J1 RCV MON: Access point to regenerated CEPT signal from

RCV the external network
XMT MON: Access pont to CEPT signal being transmitted
XMT

J2
J1 and J2: Buffered recovered clocks derived from external
J4
carrier facility (Ref 1 & 2)

J4: CEPT interface to the external digital carrier

J5

J3
J5: D-channel interface (DCHI) for common channel signaling

J3: Standard 18-pair connector to Core Switch Network Loop

J6

J6: RS-232 interface to echo canceller (satellite

transmission only). Test port only.

553-7336

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Table 2 gives information about the external connectors located on the

NT8D72 PRI2 faceplate.

Table 2
NT8D72 PRI External connectors

Faceplate Destination Type Description

J1 9-pin female, D-connector Reference Clock 0 interface

J2 9-pin female, D-connector Reference Clock 1 interface

J3 36-pin connector Loop interface

J4 15-pin male, D-connector External digital trunk

J5 15-pin male, D-connector D-Channel interface

J6 15-pin female, D-connector Echo Canceller/RS-232 interface

RCV MON Miniature bantam jack Monitor DSI from network

XMT MON Miniature bantam jack Monitor DSI from PRI

Cable requirements
Table 3 lists the types of cable used and the lengths required for internal and
external NT8D72 PRI2 connections.

Note: No additional cabling is required for nB+D configurations.

Multiple PRIs and the D-Channel are associated at the PRI prompt in
LD 17.

Table 3
NT8D72AB and NT8D72BA PRI: Cables and cable lengths (Part 1 of 2)

Maximum length
Cable Type From To (meters)

NT8D79AA PRI card Clock controller (CC-0) 2.13

NT8D79AA PRI card Clock controller (CC-1) 2.13

QCAD328A PRI card DCH card 1.8

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Table 3
NT8D72AB and NT8D72BA PRI: Cables and cable lengths (Part 2 of 2)

QCAD328B PRI card DCH card 5.5

QCAD328C PRI card DCH card 10.67

QCAD328D PRI card DCH card 15.24

NTND26AA PRI card MSDL 1.8

NTND26AB PRI card MSDL 5.5

NTND26AC PRI card MSDL 10.67

NTND26AD PRI card MSDL 15.24

NT8D85AB PRI card Network Network Card 15.24

RS-232 PRI card Echo canceller 15.24

NT8D7207 PRI card I/O panel 3.05

NT8D7205 I/O panel crossconnect 15.24

Carrier interface
The NT8D72 PRI2 provides an interface to the 2Mb external digital line
either directly or through an office repeater, echo canceller or line terminating
unit (LTU).

Echo canceller interface

Echo cancellers are required only on satellite transmission circuits. The echo
canceller detects the length of the loop, and then cancels out reflected
transmission. (Callers will not hear echoes of their own voices reflecting
back to them from the far end of the call.)

The echo canceller’s control protocol must conform with that of the Tellabs
Model 251. Both the echo canceller and the PRI circuit card act as Data
Terminal Equipment (DTE).

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QMT21 High Speed Data Module

The QMT21 High Speed Data Module supports the 64K Clear Data feature.
(It allows data terminating equipment (DTE) to send and receive 64-Kb/s
clear data.) The QMT21B is required for Large System to Large System
configurations.

QPC720 PRI for 1.5/2.0 Mb gateway

Systems which are being used as a 1.5/2.0 Mb Gateway, one or more QPC720
(1.5 Mb) Primary Rate Interface circuit cards will also be needed.

Note: Older vintages of the QPC720 PRI cannot be used for Gateway
applications. The 1.5/2.0 Mb Gateway feature requires the use of a
QPC720 circuit card with firmware updated to provide modified PAD
values.

Clock operation for the NT8D72

There are two types of clock operation—tracking mode and free-run mode.

Tracking mode
In tracking mode, the PRI loop supplies an external clock reference to a clock
controller. Two PRI loops can operate in tracking mode, with one defined as
the primary reference source for clock synchronization, the other defined as
the secondary reference source. The secondary reference acts as a back-up to
the primary reference.

As shown in Figure 6 on page 38, a system with dual CPUs can have two
clock controllers (CC-0 and CC-1). One clock controller acts as a back-up to
the other. The clock controllers should be completely locked to the reference
clock.

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Figure 6
Clock controller primary and secondary tracking

Clock
Controller 0

J1
Primary
Primary REF 1 J2
clocking
source Primary J3
Reference
Primary
REF 2
Clock Controller
Secondary Backup
Secondary REF 1
clocking
source Secondary Clock
Reference Controller 1

Secondary
REF 2 J1

J2

J3

553-7401

Free run (non-tracking) mode

The clock synchronization of the system can operate in free-run mode if:
• no loop is defined as the primary or secondary clock reference,
• the primary and secondary references are disabled, or
• the primary and secondary references are in local alarm

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Reference clock errors

The system software checks at intervals of 1 to 15 minutes to see if a clock
controller or reference-clock error has occurred. (The interval of this check
can be configured in LD 73.)

In tracking mode, at any one time, there is one active clock controller which
is tracking on one reference clock. If a clock-controller error is detected, the
system switches to the back-up clock controller, without affecting which
reference clock is being tracked.

A reference-clock error occurs when there is a problem with the clock driver
or with the reference clock at the far end. If the clock controller detects a
reference-clock error, the reference clocks are switched.

Automatic clock recovery

A command for automatic clock recovery can be selected in LD 60 with the
command EREF.

A PRI loop is disabled when it enters a local-alarm condition. If the local

alarm is cleared, the loop is enabled automatically. When the loop is enabled,
clock tracking is restored in the following conditions:
1 If the loop is assigned as the primary reference clock but the clock
controller is tracking on the secondary reference or in free-run mode, it
is restored to tracking on primary.
2 If the loop is assigned as the secondary reference clock but the clock
controller is in free-run mode, it is restored to tracking on secondary.
If the clock check indicates the switch is in free-run mode:
1 Tracking is restored to the primary reference clock if defined.
2 If the primary reference is disabled or in local alarm, tracking is restored
to the secondary reference clock if defined.

Note: If the switch is put into free-run mode by the craftsperson, it will
resume tracking on a reference clock unless the clock-switching option
has been disabled (LD 60, command MREF), or the reference clock has
been "undefined" in the database.

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Automatic clock switching

If the EREF command is selected in LD 60, tracking on the primary or
secondary reference clock is automatically switched in the following manner:
1 If software is unable to track on the assigned primary reference clock, it
switches to the secondary reference clock and sends appropriate DTC
maintenance messages.
2 If software is unable to track on the assigned secondary reference clock,
it switches to free run.

QPC720 PRI
The QPC720 PRI card is required for PRI operation in all machine types.

Power requirements
The QPC720 PRI uses power and ground from the backplane. This card does
not require an intelligent bus. Power requirements are:
• +5 volts at 6 amperes
• +12 volts at 50 milliamperes
• –12 volts at 50 milliamperes

QPC720 faceplate
QPC720 PRI contains five LEDs and six external connectors. Figure 7 on
page 41 shows the QPC720 PRI faceplate layout. Table 4 on page 41 gives
information about the external connectors located on the QPC720 PRI
faceplate.

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Figure 7
QPC720 PRI faceplate layout

Q DIS: Card is disabled

P
C ACT: Card is enabled
7
2 RED: Red alarm (local alarm)-card or transmission fault
0
YEL: Yellow alarm (remote alarm)-far end fault
LBK: Loop -back test - see PRI tests

J1 RCV MON: Access point to regenerated DS-1

RCV signal from the external network
XMT MON: Access pont to DS-1 signal being transmitted
XMT

J2
J1 and J2: Recovered reference clocks derived from and
J4
received (RCV) DS-1 signal

J4: T1 interface to the external digital carrier

J5

J3
J5: D-channel interface (DCHI) cable connection
to QPC757 or MSDL card
J3: Network loop cable connector to QPC414 Network Card
J6

J6: RS-232 interface to echo canceller (satellite

transmission only)

553-AAA0084

Table 4
QPC720 PRI external connectors

Faceplate destination Type

J1 9-pin female, D-connector

J2 9-pin female, D-connector

J3 36-pin connector

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Faceplate destination Type

J4 15-pin male, D-connector

J5 15-pin male, D-connector

J6 15-pin female, D-connector

RCV MON Miniature bantam jack

XMT MON Miniature bantam jack

QPC720 Cable requirements

Table 5 on page 43 lists the types of cable used and the lengths required for
external QPC720 PRI connections.

Note: No additional cabling is required for nB+D configurations.

Multiple PRIs and the D-channel are associated through software in
LD 17, prompt PRI.

Carrier interface
The QPC720 PRI provides an interface to the DS-1 Channel either directly,
through an office repeater, or through an Echo Canceller.

The T1 Channel Service Units listed below are compatible with the QPC720
PRI card and the 64K Clear Data feature as well as with PRI connection
parameters such as the Superframe format, the Extended superframe format,
and the B7 and B8ZS Alternate Mark Inversion (AMI) line coding.
• Digital Link 551A
• Digital Link 551C
• Digital Link 551E
• Tellabs Model 441
• Verilink Model 551V ST

In the U.S.A., FCC Part 68 regulations require Network Channel Terminating

Equipment (for example, the NT QRY551 Channel Service Unit) installed at

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 ISDN Primary Rate Interface equipment overview Page 43 of 396

of the point of connection between a system and a registered common carrier

trunk.

Echo Canceller interface

Echo Cancellers are required only with satellite transmission. The Echo
Canceller detects the length of the loop, then cancels the reflected
transmission (callers do not hear their own voices echoed).

The QPC720 PRI provides both a T1 line interface and a control interface to
link to a signal format compatible with EIA standard RS-232-C. Both the PRI
and the Echo Canceller act as Data Terminal Equipment (DTE). The Echo
Canceller’s control protocol must conform to that of the Tellabs Model 251.

64 T-link version 2 protocol

The QPC720 card supports the 64 T-link version 2 protocol. The QPC720
together with the QMT21 High Speed Data Module supports the 64K Clear
Data feature. The QPC720 card provides a trunk that ties two switches
together. This trunk allows 64K Clear Data to pass from the system to an
outside network. The QMT21 module allows Data Terminal Equipment
(DTE) to send and receive 64K Clear Data. See Meridian Link ISDN/AP
General Guide (553-2901-100) for more information about the 64K Clear
Data feature.

Table 5
QPC720 PRI cables and cable lengths (Part 1 of 2)

Maximum
Maximum length
Cable type From To length (feet) (meters)

QCAD130 QPC720 QPC471/QPC775 (CC-0) 7 2.13

QCAD130 QPC720 QPC471/QPC775 (CC-1) 7 2.13
QCAD328A QPC720 QPC757 DCHI 6 1.8
QCAD328B QPC720 QPC757 DCHI 18 5.5
QCAD328C QPC720 QPC757 DCHI 35 10.67

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Table 5
QPC720 PRI cables and cable lengths (Part 2 of 2)

Maximum
Maximum length
Cable type From To length (feet) (meters)

QCAD328D QPC720 QPC757 DCHI 50 15.24

QCAD124 QPC720 QPC414 Network 50 15.24
QCAD128 QPC720 Bulkhead I/O panel 25 7.62
RS-232 QPC720 Echo Canceller 50 15.24
NTND26AA QPC720 NT6D80 MSDL 6 1.8
NTND26AB QPC720 NT6D80 MSDL 18 5.5
NTND26AC QPC720 NT6D80 MSDL 35 10.67
NTND26AD QPC720 NT6D80 MSDL 50 15.24
NTND98 QPC720 Input/output panel 6 1.8
22AWG ABAM Echo Canceller DSX-1 655 199.64

Note: The QPC775 Clock Controller is not available in the U.S.A. There
can be no mixing of QPC775 and QPC471 in one system.

Disk drive hardware

The following hardware is required for Large System upgrades:
• 3.5-inch disk drive unit
• disk drive controller for above
• cable for above

NT5D97 Dual-port DTI2/PRI2 card

The NT5D97 is a dual-port 2.0 Mb DTI2/PRI2 card (the DDP2 firmware
functions in DTI2 or PRI2 mode, depending on DIP switch settings) that

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integrates the functionality of two NT8D72BA PRI2 cards, and one QPC414
ENET card into a single CE card. The NT5D97 occupies a single slot in the
Network shelf and provides two DTI2/PRI2 network connections: an
interface to an external D-Channel Handler (the NT6D11AF) or the NT6D80
Multi-purpose Serial Data Link card, and an optional plug-on NTBK51AA
Downloadable D-Channel daughterboard (DDCH) with two DCH interface
ports.

The NT5D97 DDP2 card can be mixed in the same machine with PRI2
NT8D72BA cards.

The NT5D97 DDP2 card hardware design uses a B57 ASIC E1/T1 framer.
The carrier specifications comply with the ANSI TI.403 specification. The
NT5D97 provides an interface to the 2.048 Mbps external digital line either
directly or through an office repeater, Network Channel Terminating
Equipment (NCTE), or Line Terminating Unit (LTU).

DANGER OF ELECTRIC SHOCK

The NT5D97 DDP2 card is not designed to be
connected directly to the Public Switched Network,
or other exposed plant networks. Such a connection
should only be done using an isolating-type
networking terminating device that provides voltage
surge protection, such as a Line Terminating Unit
(LTU), Network Channel Terminating Equipment
(NCTE), or Network Termination 1 (NT1), as
certified by your local, regional, or national safety
agency and telecommunications authority.

External D-Channel Interface DCH or MSDL

The connection between the DDP2 card and the external DCH or MSDL is
through a 26 pin female D type connector. The data signals conform to the
electrical characteristics of the EIA standard RS-422.

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Two control signals are used to communicate the D-channel link status to the
DCH or MSDL. These are:
• Receiver Ready (RR), originating at the DDP2 card, to indicate to the
DCH or MSDL that the D-channel link is operational.
• Transmitter Ready (TR), originating at the DCH or MSDL, to indicate to
the DDP2 card that the DCH are ready to use the D-channel link.

Table 6 indicates how the RR control signal operates with regard to the DDP2
status.

Table 6
DCH/MSDL Receiver Ready control signals

RR State Condition

ON D-Channel data rate selected at 64 Kbps

and

PRI2 loop is enabled

and

PRI2 link is not in OOS or Local Alarm mode state

and

PRI2 link is not transmitting a Remote Alarm pattern

and

PRI2 link is not receiving a Remote Alarm Indication

from a remote facility

OFF All other conditions

NT5D97 faceplate
Figure 8 on page 48 illustrates the faceplate layout for the NT5D97 DDP
card. The faceplate contains an enable/disable switch; a DDCH status LED;
6 x 2 trunk port status LEDs; and six external connectors. Table 7 on page 49
shows the name of each connector, its designation with respect to the

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faceplate and the name and description of the card it is connected to. Also
shown are the names of the LEDs.

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Figure 8
NT5D97 faceplate

D-Channel LED

Enb
ENET LED Dis
Trunk Disable LED
Trunk Out of Service LED
Near End Alarm LED
Far End Alarm LED
Loop Back LED
Recovered Clock0#1
Recovered Clock0#2
Recovered Clock1#1
Recovered Clock1#2
Trunk0 / Trunk1

External DCHI/MSDL

553-7380

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Table 7
External connectors and LEDs

Faceplate
Function Designator Type Description

Switch ENB/DIS Plastic, ESD protected Card Enable/disable switch

Connectors Unit 0 Clock 0 RJ11 Connector Connects reference clock 0 to

Clock Controller card 0

Unit 0 Clock 1 RJ11 Connector Connects reference clock 0 to

Clock Controller card 1

Unit 1 Clock 0 RJ11 Connector Connects reference clock 1 to

Clock Controller card 0

Unit 1 Clock 1 RJ11 Connector Connects reference clock 1 to

Clock Controller card 1

J5 TRK 9 Pin Two external E1 Trunk 0 and

Female D Connector Trunk 1

J6 DCH 26 Pin Connects to external DCH or

Female D Connector MSDL

LEDs ENET 2 Red LEDs ENET 0 or ENET 1 is disabled

DIS 2 Red LEDs Trunk 0 or Trunk 1 is disabled

OOS 2 Yellow LEDs Trunk is out of service

NEA 2 Yellow LEDs Local (Near End) Alarm

FEA 2 Yellow LEDs Far End Alarm

LBK 2 Yellow LEDs Loop Back test being

performed on Trunk 0 or
Trunk 1

DCH Bicolor Red/Green LED NTBK51AA status

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The following is a brief description of each element on the faceplate.

Enable/Disable Switch
This switch is used to disable the card prior to insertion or removal from the
network shelf. While this switch is in disable position, the card will not
respond to the system CPU.

ENET LEDs
Two red LEDs indicate if the “ENET0” and “ENET1” portions of the card are
disabled. These LEDs are lit in the following cases:
• When the enable/disable switch is in disabled state (lit by hardware).
• After power-up, before the card is enabled.
• When the ENET port on the card is disabled by software.

Trunk Disable (DIS) LEDs

Two red LEDs indicate if the “trunk port 0” or “trunk port 1” portions of the
card are disabled. These LEDs are lit in the following cases:
• upon reception of the “disable loop” message from the software
• after power-up

OOS LEDs
Two yellow LEDs indicate if the “trunk port 0” and “trunk port 1” portions
of the card are out-of-service.

NEA LEDs
Two yellow LEDs indicate if the near end detects absence of incoming signal
or loss of synchronization in “trunk port 0” or “trunk port 1” respectively. The
Near End Alarm causes a Far End Alarm signal to be transmitted to the far
end.

FEA LEDs
Two yellow LEDs indicate if a Far End Alarm has been reported by the far
end (usually in response to a Near End Alarm condition at the far end) on
“trunk port 0” or “trunk port 1”.

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LBK LEDs
Two yellow LEDs indicate if a remote loopback test is being performed on
trunk port 0 or trunk port 1. The loopback indication is active when the digital
trunk is in remote loopback mode. Normal call processing is inhibited during
the remote loopback test.

DCH LED
When the dual colored LED is red, it indicates the on-board DDCH is present
but disabled. When the dual colored LED is green, it indicates the on-board
DDCH is present and enabled. If a DDCH is not configured on the DDP2
card, this lamp is not lit.

Unit 0 Clk Connectors

Two RJ11 connectors for connecting:
• Digital trunk unit 0 recovered clock to primary or secondary reference
source on clock controller card 0.
• Digital trunk unit 0 recovered clock to primary or secondary reference
source on clock controller card 1.

Unit 1 Clk Connectors

Two RJ11 connectors for connecting:
• Digital trunk unit 1 recovered clock to primary or secondary reference
source on clock controller card 0.
• Digital trunk unit 1 recovered clock to primary or secondary reference
source on clock controller card 1.

Connector J5 (TRK)
A 9 pin D-Type connector used to connect:
• Digital trunk unit 0 receive and transmit Tip / Ring pairs
• Digital trunk unit 1 receive and transmit Tip / Ring pairs

Connector J6 (DCH)
A 26-pin D-type connector is used to connect the DDP2 card to the external
MSDL or D-channel handler.

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System capacity and performance

Physical capacity
Each NT5D97 DDP2 card occupies one slot on the network shelf. Each card
supports two digital trunk circuits and two network loops. The total number
of DDP2 cards per system is limited by the number of network loops, physical
capacity of the shelf, number of DTI2/PRI2 interfaces allowed by the
software and the range of DCH addresses.

D-Channel capacity
The software configuration for the NTBK51AA DDCH is similar to the
MSDL and only supports D-channel functionality.

The system has a total capacity of 16 addresses (Device Addresses or

DNUM) that can be reserved for DCH card, MSDL card or DDCH card. One
exception is DNUM 0 which is commonly assigned to the TTY terminal.

No two different D-Channel providers can share the same DNUM. Hence, the
combined maximum number of DCH, MSDL and DDCH cards in the system
is 16.

The DCH has one D-Channel unit, the DDCH has two D-Channel units, and
the MSDL has a maximum of four units. Therefore, the total number of
D-Channel is derived by the following formula:
Total_Num_DCH-Units = Num_DCHx1 + Num_DDCHx2 + Num_MSDLx4

Therefore, Total_Num_DCH-Units in any given system is between 0-63.

CPU capacity
Using a NT5D97 DDP2 card instead of DTI2/PRI2 cards does not increase
the load on the system CPU. The DDP2 replaces an ENET card and two
DTI2/PRI2 cards. Emulating the ENET card and the overall CPU capacity is
not impacted by using a DDP2 card instead of a DTI2/PRI2 card.

Power requirements
Table 8 on page 53 lists the power requirements for the NT5D97 DDP2 card.

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Table 8
NT5D97 DDP2 power requirements

Voltage Source Current

DDP2 DDP2
(without (with
NTBK51AA) NTBK51AA)

+5V Backplane 3A 3.8A

+12V Backplane 25mA 75mA

-12V Backplane 25mA 75mA

Total Power (Maximum) 15.6W 20.8W

Testability and diagnostics

The DDP2 card supports testing and maintenance functions through the
following procedures:
• Self test upon power up or reset
• Signalling test performed in the LD 30
• Loopback tests, self tests, and continuity tests performed by LD 60 and
LD 45
• The D-Channel (DCH, MSDL, DDCH) maintenance is supported by
LD 96.

Note: The MSDL selftest is not applicable to the NTBK51AA

D-Channel daughterboard.

Cable requirements
This section lists the types of cable used and the lengths required for internal
and external NT5D97 DDP2 connections.

Note: No additional cabling is required for nB+D configurations.

Multiple DDP2 cards and the D-channel are associated through software
in LD 17.

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DDP2 cable assemblies include:

• E1 carrier cables
— NTCK45AA (A0407956)
— NT8D7217 (A0617192)
— NTCK78AA (A0618294)
— NTCK79AA (A0618296)

• DDP2 to QPC471/QPC775 Clock Controller Cables

— NTCG03AA
— NTCG03AB
— NTCG03AC
— NTCG03AD

• DDP2 to DCH cables

— NTCK46AA
— NTCK46AB
— NTCK46AC
— NTCK46AD

• DDP2 to MSDL cables

— NTCK80AA
— NTCK80AB
— NTCK80AC
— NTCK80AD

A description of each type of DDP2 cable follows.

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E1 carrier cables

NTCK45AA (A0407956)
The NTCK45AA (8 ft.) is an 120Ω cable for systems equipped with an I/O
filter panel, connecting the TRK port (P1, D-type 9 pin male) on the DDP2
faceplate to the I/O filter (P2, P3 D-type 9 pin males).

Figure 9
NTCK45AA

P2
P1
P3
D-type D-type
9 pin, males 15 pin, males
553-7385

Table 9 lists the pin attributes for the NTCK45AA cable.

Table 9
NTCK45AA cable pins (Part 1 of 2)

DDP2 I/O Panel

Cable Name Description Color pins pins

0 T-PRI0TX Trunk 0 Transmit Tip Black P1-1 P2-6

0 R-PRI0TX Trunk 0 Transmit Ring Red P2-2 P2-7

0 T-PRI0RX Trunk 0 Receive Tip Black P1-3 P2-2

0 R-PRI0RX Trunk 0 Receive Ring White P1-4 P2-3

0 GND Shield Wire Bare N/C Case P2

0 GND Shield Wire Bare N/C Case P2

0 Standard Wire (3”) Bare Case P2 P2-5

0 Standard Wire (3”) Bare Case P2 P2-9

1 T-PRI1TX Trunk 1 Transmit Tip Black P1-5 P3-6

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Table 9
NTCK45AA cable pins (Part 2 of 2)

DDP2 I/O Panel

Cable Name Description Color pins pins

1 R-PRI1TX Trunk 1 Transmit Ring Red P1-6 P3-7

1 T-PRI1RX Trunk 1 Receive Tip Black P1-7 P3-2

1 R-PRI1RX Trunk 1 Receive Ring White P1-8 P3-3

1 GND Shield Wire Bare N/C Case P3

1 GND Shield Wire Bare N/C Case P3

1 Standard Wire (3”) Bare Case P3 P3-5

1 Standard Wire (3”) Bare Case P3 P3-9

NT8D7217 (A0617192)
The NT8D7217 (50 ft.) is a 120Ω cable for systems equipped with an I/O
filter panel, connecting the 9 pin I/O filter connector to the 9 pin NCTE
connector.

Figure 10
NT8D7217

P1 P2
I/O Panel Trunk Multiplexer Trunk
D-type 9 pin, female D-type 9 pin, male

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Table 10 which follows lists the pin attributes for the NT8D7217 cable.

Table 10
NT8D7217 cable pins

DDP2 I/O Panel

Cable Name Description Color pins pins

0 T-PRI0TX Trunk 0 Transmit Tip Black P1-6 P2-6

0 R-PRI0TX Trunk 0 Transmit Ring White P1-7 P2-7

0 T-PRI0RX Trunk 0 Receive Tip Black P1-2 P2-2

0 R-PRI0RX Trunk 0 Receive Ring Red P1-3 P2-3

0 GND Shield Wire Bare P1-5 N/C

0 GND Shield Wire Bare P1-9 N/C

1 T-PRI1TX Trunk 1 Transmit Tip Black P1-6 P2-6

1 R-PRI1TX Trunk 1 Transmit Ring White P1-7 P2-7

1 T-PRI1RX Trunk 1 Receive Tip Black P1-2 P2-2

1 R-PRI1RX Trunk 1 Receive Ring Red P1-3 P2-3

1 GND Shield Wire Bare P1-5 N/C

1 GND Shield Wire Bare P1-9 N/C

NTCK78AA (A0618294)
The NTCK78AA (50 ft.) is a 120Ω cable for connecting the TRK port on the
DDP2 faceplate (P1, D-type 9 pin male) to the Main Distribution Frame
(MDF) (P2, P3 D-type 15-pin males). The NTCK78AA is used for systems
not equipped with an I/O filter panel.

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Figure 11
NTCK78AA

P2
P1
P3
D-type D-type
9 pin, males 15 pin, males
553-7385

Table 11 lists the pin attributes for the NTCK78AA cable.

Table 11
NTCK78AA cable pins

DDP2
Cable Name Description Color pins NCTE pins

0 T-PRI0TX Trunk 0 Transmit Tip Black P1-1 P2-1

0 R-PRI0TX Trunk 0 Transmit Ring Red P1-2 P2-9

0 T-PRI0RX Trunk 0 Receive Tip Black P1-3 P2-3

0 R-PRI0RX Trunk 0 Receive Ring White P1-4 P2-11

0 GND Shield Wire Bare P1 Case P2-2

0 GND Shield Wire Bare P1 Case P2-4

1 T-PRI1TX Trunk 1 Transmit Tip Black P1-5 P3-1

1 R-PRI1TX Trunk 1 Transmit Ring Red P1-6 P3-9

1 T-PRI1RX Trunk 1 Receive Tip Black P1-7 P3-3

1 R-PRI1RX Trunk 1 Receive Ring White P1-8 P3-11

1 GND Shield Wire Bare P1 Case P3-2

1 GND Shield Wire Bare P1 Case P3-4

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NTCK79AA (A0618296)
The NTCK79AA (40 ft) is a 75Ω coaxial cable for connecting the TRK port
on the DDP2 faceplate (P1, D-type 9 pin male) to the Line Terminating Unit
(LTU) (P2, P3, P4, P5 BNC males).

Figure 12
NTCK79AA

P2: Unit 0 Tx
P3: Unit 0 Rx
P1
P4: Unit 1 Tx
D-type P5: Unit 1 Rx
9 pin, male BNC
males
553-7388

Table 12 lists the pin attributes for the NTCK79AA cable.

Table 12
NTCK79AA cable pins (Part 1 of 2)

DDP2
Cable Name Description Color pins NCTE pins

0 T-PRI0TX Trunk 0 Transmit Tip Red P1-1 P2 inner

conductor

0 R-PRI0TX Trunk 0 Transmit Ring Red P1-2 P2 shield

0 T-PRI0RX Trunk 0 Receive Tip Green P1-3 P3 inner

conductor

0 R-PRI0RX Trunk 0 Receive Ring Green P1-4 P3 shield

1 T-PRI1TX Trunk 1 Transmit Tip Red P1-5 P4 inner

conductor

1 R-PRI1TX Trunk 1 Transmit Ring Red P1-6 P4 shield

1 T-PRI1RX Trunk 1 Transmit Tip Green P1-7 P5 inner

conductor

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Table 12
NTCK79AA cable pins (Part 2 of 2)

DDP2
Cable Name Description Color pins NCTE pins

1 R-PRI1RX Trunk 1 Receive Ring Green P1-8 P5 shield

1 Outer metalized PVC Bare N/C P1 Case

shield

1 3 stranded wire Bare N/C P1 Case

Reference clock cables

The NTCG03AA (14 ft), NTCG03AB (2.8 ft), NTCG03AC (4.0 ft), or
NTCG03AD (7 ft), is a DDP2 card to Clock Controller cable, connecting
each of the CLK0 or CLK1 ports on the DDP2 faceplate to the primary or
secondary source ports on Clock Controller card 0 or 1.

Figure 13
NTCG03AA/AB/AC/AD

2.8, 4, 7 or 14 ft.
P1 P2

Connector P1 - 4 pin, male, RJ11 (DDP2 faceplate)

Connector P2 - 9 pin, male, D-type (Clock Controller)

Note: Includes a 9 pin D-type adaptor.

553-7384

MSDL/DCH cables

External DCH cable

The NTCK46 cable connects the DDP2 card to the
NT6D11AF/NT5K75AA/NT5K35AA D-Channel Handler card. The cable is
available in four different sizes:
• NTCK46AA (6 ft.) - DDP2 to DCH cable

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• NTCK46AB (18 ft.) - DDP2 to DCH cable

• NTCK46AC (35 ft.) - DDP2 to DCH cable
• NTCK46AD (50 ft.) - DDP2 to DCH cable

Figure 14
NTCK46AA/AB/AC/AD

P2
P1
D-type P3
9 pin, males D-type
15 pin, males
553-7387

External MSDL cable

The NTCK80 cable connects the DDP2 card to the NT6D80 MSDL card. The
cable is available in four different sizes:
• NTCK80AA (6 ft) - DDP2 to MSDL cable
• NTCK80AB (18 ft) - DDP2 to MSDL cable
• NTCK80AC (35 ft) - DDP2 to MSDL cable
• NTCK80AD (50 ft) - DDP2 to MSDL cable

Figure 15
NTCK80AA/AB/AC/AD

P2
P1
D-type P3
9 pin, males D-type
15 pin, males
553-7387

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Cable diagrams
Figure 16 on page 63 and Figure 17 on page 64 provide examples of typical
cabling configurations for the DDP2.

Figure 16 on page 63 shows a typical DDP2 cabling for a system with an I/O
panel, with the connection between the I/O panel and a Network Channel
Terminating Equipment (NCTE).

Figure 17 on page 64 shows cabling for a system without an I/O panel. Here,
the DDP2 faceplate is cabled directly to the NCTE.

Note: Since several clock cabling options exist, none has been
represented in the diagrams. Refer to “Clock configurations” on page 68
for a description on each available option.

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Figure 16
DDP2 cable for systems with an I/O panel

Enb
Switch Dis
Clock Controllers

LEDs

clk0
Port 0
clk1
clk0
Port 1 NCTE
(MDF or LTU) NCTE
clk1
NT8D7217 cable
Trunk NTCK78AA/NTCK79AA cable
NT8D7217 cable

DCH NTCK80 cable to MSDL or

NTCK48 cable to DCHI

NT6D80 MSDL or
NT6D11AF/NT5K75AA/
NT5K35AA DCHI

Note: For possible clock cabling options, refer to the

"Clocking configurations" chapter.

553-AAA1104

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Figure 17
DDP2 cable for systems without an I/O panel

Enb
Switch Dis
Clock Controllers
NTCG03 cables

LED's

clk0
Unit 0
clk1
clk0 NCTE
Unit 1 (MDF or LTU)
clk1

Trunk NTCK78AA/NTCK79AA cable

DCH NTCK80 cable to MSDL or

NTCK48 cable to DCHI

NT6D80 MSDL or
NT6D11AF/NT5K75AA/
NT5K35AA DCHI

Note: for possible clock cabling options, refer to the

"Clocking configurations" chapter

553-7400

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Clock for the NT5D97

Clock operation
There are two types of clock operation — tracking mode and free-run mode.

Tracking mode
In tracking mode, the DDP2 loop supplies an external clock reference to a
clock controller. Two DDP2 loops can operate in tracking mode, with one
defined as the primary reference source for clock synchronization, the other
defined as the secondary reference source. The secondary reference acts as a
back-up to the primary reference.

As shown in Figure 18 on page 66, a system with dual CPUs can have two
clock controllers (CC-0 and CC-1). One clock controller acts as a back-up to
the other. The clock controllers should be completely locked to the reference
clock.

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Figure 18
Clock Controller primary and secondary tracking

Clock
Controller 0

J1
Primary
Primary REF 1 J2
clocking
source Primary J3
Reference
Primary
REF 2
Clock Controller
Secondary Backup
Secondary REF 1
clocking
source Secondary Clock
Reference Controller 1

Secondary
REF 2 J1

J2

J3

Free run (non-tracking) mode

The clock synchronization of the system can operate in free-run mode if:
• no loop is defined as the primary or secondary clock reference,
• the primary and secondary references are disabled, or
• the primary and secondary references are in local (near end) alarm

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Reference clock errors

The system software checks at intervals of 1 to 15 minutes to see if a clock
controller or reference-clock error has occurred. (The interval of this check
can be configured in LD 73).

In tracking mode, at any one time, there is one active clock controller which
is tracking on one reference clock. If a clock controller error is detected, the
system switches to the back-up clock controller, without affecting which
reference clock is being tracked.

A reference-clock error occurs when there is a problem with the clock driver
or with the reference clock at the far end. If the clock controller detects a
reference-clock error, the reference clocks are switched.

Automatic clock recovery

A command for automatic clock recovery can be selected in LD 60 with the
command EREF.

A DDP2 loop is disabled when it enters a local-alarm condition. If the local

alarm is cleared, the loop is enabled automatically. When the loop is enabled,
clock tracking is restored in the following conditions:
• If the loop is assigned as the primary reference clock but the clock
controller is tracking on the secondary reference or in free-run mode, it
is restored to tracking on primary.
• If the loop is assigned as the secondary reference clock but the clock
controller is in free-run mode, it is restored to tracking on secondary.
• If the clock check indicates the switch is in free-run mode:

— Tracking is restored to the primary reference clock if defined.

— If the primary reference is disabled or in local alarm, tracking is
restored to the secondary reference clock if defined.
Note: If the system is put into free-run mode by the craftsperson, it
resumes tracking on a reference clock unless the clock-switching option
is disabled (LD 60, command MREF), or the reference clock is
“undefined” in the database.

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Automatic clock switching

If the EREF command is selected in LD 60, tracking on the primary or
secondary reference clock is automatically switched in the following manner:
• If software is unable to track on the assigned primary reference clock, it
switches to the secondary reference clock and sends appropriate DTC
maintenance messages.
• If software is unable to track on the assigned secondary reference clock,
it switches to free run.

Clock configurations
Clock Controllers can be used in a single or a dual CPU system.

A single CPU system has one Clock Controller card. This card can receive
reference clocks from two sources referred to as the primary and secondary
sources. These two sources can originate from a PRI2, DTI2, etc. PRI2 cards
such as the NT8D72BA are capable of supplying two references of the same
clock source. These are known as Ref1 (available at J1) and Ref2 (available
at J2) on the NT8D72BA.

The NT5D12 card is capable of supplying two references from each clock
source, i.e., four references in total. NT5D12 can supply Clk0 and Clk1 from
Unit 0 and Clk0 and Clk1 from Unit 1. Either Unit 0 or Unit 1 can originate
primary source, as shown in Figure 19 through Figure 22 on pages 66 to 74.

There is one Clock Controller cable required for the DDP2 card, which is
available in four sizes; this is the NTCG03AA/AB/AC/AD. Refer to
“Reference clock cables” on page 60 for more information.

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Table 13 summarizes the clocking options. Table 14 on page 70 explains the

options in more detail.

Table 13
Clock Controller options - summary

CC Option CPU Type Notes

Option 1 Single Ref from P0 on Clk0

Ref from P1 on Clk0

Option 2 Dual Ref from P0 on Clk0

Ref from P0 on Clk1

Option 3 Dual Ref from P1 on Clk0

Ref from P1 on Clk1

Option 4 Dual Ref from P0 on Clk0

Ref from P0 on Clk1

Ref from P1 on Clk0

Ref from P1 on Clk1

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Table 14
Clock Controller options - description

Clock Notes
Option

Option 1 This option provides a single CPU system with 2 clock

sources derived from the 2 ports of the DDP2.

Connector Clk0 provides a clock source from Unit 0.

Connector Clk0 provides a clock source from Unit 1.

Refer to Figure 19 on page 71.

Option 2 This option provides a Dual CPU system with 2 references

of a clock source derived from port 0 of the DDP2.

Connector Clk0 provides a Ref 1 clock source from Unit 0.

Connector Clk1 provides a Ref 2 clock source from Unit 0.

Refer to Figure 20 page 72

Option 3 This option provides a Dual CPU system with 2 references

of a clock source derived from port 1 of the DDP2.
Connector Clk0 provides a Ref 1 clock source from Unit 1.

Connector Clk1 provides a Ref 2 clock source from Unit 1.

Refer to Figure 21 page 73

Option 4 This option provides a Dual CPU system with 2 references

from each clock source derived from the DDP2.

Connector Clk0 provides a Ref 1 clock source from Unit 0.

Connector Clk1 provides a Ref 2 clock source from Unit 0.

Connector Clk0 provides a Ref 1 clock source from Unit 1.

Connector Clk1 provides a Ref 2 clock source from Unit 1.

Refer to Figure 22 page 74.

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Figure 19
Clock Controller – Option 1

Clock
Controller 0

J1
Primary
Primary REF 1 J2
clocking
source Primary J3
Reference
Primary
REF 2
Clock Controller
Secondary Backup
Secondary REF 1
clocking
source Secondary Clock
Reference Controller 1

Secondary
REF 2 J1

J2

J3

553-7401

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Figure 20
Clock Controller – Option 2

Clock Controller
for CPU 0

DDP2 J1 Sec.
Primary Ref 1
Primary clk 0 J2 Prim.
Reference
Port 0
Primary Ref 2
clk 1

Clk0

Port 1
Clk1 Secondary Ref 1

DDP2
Secondary Ref 1
Secondary clk 0 Clock Controller
Reference for CPU 1
Port 0
Secondary Ref 2
clk 1 J1 Sec.

J2 Prim.
Clk0

Port 1
Clk1

J1 Ref 1
An NT8D72BA may Secondary Ref 2
NT8D72BA
be configured as an
alternate to DDP2 J2 Ref 2

Both references from port 0 553-7403

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Figure 21
Clock Controller – Option 3

DDP2
clk 0
Clock Controller
Port 0 for CPU 0
clk 1
J1 Sec.
Primary Primary Ref 1
Clk0 J2 Prim.
Reference
Port 1
Primary Ref 2
Clk1

Secondary Ref 1

DDP2 Clock Controller

clk 0 for CPU 1

Port 0
J1 Sec.
clk 1
J2 Prim.
Secondary Secondary Ref 1
Clk0
Reference
Port 1
Secondary Ref 2
Clk1

J1 Ref 1
An NT8D72BA may
NT8D72BA
be configured as an
alternate to DDP2 J2 Ref 2
Secondary Ref 2

Both references from port 1 553-7404

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Figure 22
Clock Controller – Option 4

Clock Controller
for CPU 0

DDP2
J1 Sec.
Primary Ref 1
Primary clk 0 J2 Prim.
Reference
Port 0
Primary Ref 2
clk 1

Secondary Ref 1
Secondary Clk0 Clock Controller
Reference for CPU 1
Port 1
Secondary Ref 2
Clk1 J1 Sec.

J2 Prim.

Both references from both ports

553-7402

NT5D12 Dual-port DTI/PRI

The NT5D12 is a dual-port 1.5 DTI/PRI card (the DDP firmware functions in
DTI or PRI mode) integrating the functionality of two QPC472 DTI/DDP2
PRI cards and one QPC414 ENET into one card. The NT5D12 occupies a
single Network shelf slot and provides two DTI/PRI network connections, an
optional connection to an external D-Channel Handler, the QPC757
D-Channel Handler Interface (DCHI) or NT6D80 Multi-purpose Serial Data
Link (MSDL), and an optional plug-on NTBK51AA Downloadable
D-Channel daughterboard (DDCH.)

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The NT5D12 DDP card supports all features (except the echo canceller and
protocol conversion) of the QPC720. In addition, it maintains the backward
compatibility of QPC720.

The NT5D12 DDP card hardware design uses a B57 ASIC E1/T1 framer. The
carrier specifications comply with the ANSI TI.403 specification. The
NT5D12 provides an interface to the 1.5 Mb external digital line either
directly or through an office repeater, Line Terminating Unit (LTU), or
Channel Service Unit (CSU).

D-Channel and MSDL interface

The connection between the DDP card and the DCHI or MSDL is via a 26 pin
female D type connector. The data signals conform to the electrical
characteristics of the EIA standard RS-422.

Two control signals are used to communicate the D-Channel link status to the
DCHI or MSDL. These are:
• Receiver Ready (RR), originating at the DDP card, to indicate to the
DCHI or MSDL that the D-channel link is operational.
• Transmitter Ready (TR), originating at the DCHI or MSDL, to indicate
to the DDP card that the DCHI or MSDL are ready to use the D-Channel
link.

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Table 15 indicates how the RR control signal operates with regard to the DDP
status.

Table 15
DCHI/MSDL Receiver Ready control signals

RR State Condition

ON D-Channel data rate selected at 64 Kbps or 56 Kbps or

64 Kbps inverted

and

PRI loop is enabled

and

PRI link is not in RED alarm mode state

and

PRI link is not transmitting a yellow alarm pattern

and

PRI link is not receiving a Remote Alarm Indication

from the remote facility

and
PRI link is not in FA3 mode

and

Transmitter Ready (TR) control signal from the

DCHI/MSDL is ON

OFF All other conditions

NT5D12 faceplate
Figure 23 on page 78 and Figure 24 on page 79 illustrate the faceplate layout
for the NT5D12 DDP card. The faceplate contains an enable/disable switch;
a DDCH status LED; 6 x 2 trunk port status LEDs; and six external
connectors. Table 7 on page 49 shows the name of each connector, its

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designation with respect to the faceplate and the name and description of the
card it is connected to. Also shown are the names of the LEDs.

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Figure 23
NT5D12 faceplate - general view

Dual PRI

DCH

Enb

Dis

p0 p1
OOS
DIS
ACT
RED
YEL
LBK

clk0
Port 0
clk1

clk0
Port 1
clk1

J5
Trk

J6
DCH

NT5D12AA
Rlse 01

P0 P1
Loop Loop

DCH DCH

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Figure 24
DDP faceplate - detailed view

Dual PRI
D-Channel LED DCH
ENB
Card Enable / Disable Switch
DIS
P0 P1
Port Out Of Service LED OOS
Trunk Port Disable LED DIS
Trunk Port Active LED ACT
Red Alarm LED RED
Yellow Alarm LED YEL
Loop Back LED LBK

Recovered Clock0 #1 clk0

Port 0
Recovered Clock0 #2 clk1

Recovered Clock1 #1 clk0

Port 1
Recovered Clock1 #2 clk1

Trunk0 / Trunk1 J5
TRK

MSDL / DCHI J6
DCH

NT5D12
P0 P1
Blank, can be used Loop Loop
to label associated equipment DCH DCH

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Table 16
External connectors and LEDs

Faceplate
Function Designator Type Description

Switch ENB/DIS Plastic, ESD Card Enable/disable switch

protected

Port 0 Clock 0 RJ11 Connector Connects reference clock to

Clock Controller card

Port 0 Clock 1 RJ11 Connector Connects reference clock to

Clock Controller card

Port 1 Clock 0 RJ11 Connector Connects reference clock to

Clock Controller card

Port 1 Clock 1 RJ11 Connector Connects reference clock to

Connectors Clock Controller card

J5 TRK 9 Pin Female Two external DS-1 Trunk 0

and Trunk 1
D Connector

J6 DCH 26 Pin Female Connects to DCHI or MSDL

D Connector

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Faceplate
Function Designator Type Description

OOS 2 Red LEDs ENET 0 or ENET 1 disabled

DIS 2 Red LEDs Trunk 0 or Trunk 1 disabled

ACT 2 Green LEDs Trunk 0 or Trunk 1 lines

active

RED 2 Red LEDs Red Alarm on Trunk 0 or

Trunk 1

YEL 2 Yellow LEDs Yellow Alarm on Trunk 0 or

LEDs Trunk 1

LBK 2 Green LEDs Loop Back test being

performed on Trunk 0 or
Trunk 1

DCH Bicolor Red/Green NTBK51AA status

LED

The following is a brief description of each element on the faceplate:

Enable/Disable Switch
This switch is used to disable the card prior to insertion or removal from the
network shelf; while this switch is in disable position, the card will not
respond to system CPU.

Port Out of Service LEDs

Two red LEDs indicate if the “ENET0” and “ENET1” portion of the card are
disabled. These LEDs are lit in the following cases:
• When the enable/disable switch is in state disable (lit by hardware)
• After power-up, before the card is enabled
• When the ENET port on the card is disabled by software.

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Trunk Port Disable LEDs

Two red LEDs indicate if the “trunk port 0” and “trunk port 1” portion of the
card are disabled. These LEDs are turned on in the following cases:
• When the enable/disable switch is in state disable (lit by hardware).
• After power-up, before the card is enabled.
• When digital trunk interface on the card is deactivated by software.

ACT LEDs
Two green LEDs indicate if the “trunk port 0” and “trunk port 1” portion of
the card is active.

RED LEDs
Two red LEDs indicate if the near end detects absence of incoming signal or
loss of synchronization in “trunk port 0” or “trunk port 1” respectively. The
Near End Alarm causes a Far End Alarm signal to be transmitted to the far
end.

YEL LEDs
Two yellow LEDs indicate if a Far End Alarm has been reported by the far
end (usually in response to a Near End Alarm condition at the far end) on
“trunk port 0” or “trunk port 1”.

LBK LEDs
Two green LEDs indicate the remote loopback test is being performed on
trunk port 0 or trunk port 1. The loopback indication is active when the digital
trunk is in remote loopback mode (T1 signals received from the far end are
regenerated and transmitted to the far end.) Normal call processing is
inhibited during remote loopback test.

DCH LED
A dual color red/green LED indicates that the on-board DDCH is present but
disabled (red), or is present and enabled (green). If a DDCH is not configured
on the DDP card, this lamp is not lit.

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Port 0 Clk Connectors

Two RJ11 connectors for connecting:
• Digital trunk port 0 recovered clock to primary or secondary reference
source on clock controller card 0.
• Digital trunk port 0 recovered clock to primary or secondary reference
source on clock controller card 1.

Port 1 Clk Connectors

Two RJ11 connectors for connecting:
• Digital trunk port 1 recovered clock to primary or secondary reference
source on clock controller card 0.
• Digital trunk port 1 recovered clock to primary or secondary reference
source on clock controller card 1.

Connector J5 (TRK)
A 9 pin D-Type connector used to connect:
• Digital trunk port 0 receive and transmit Tip / Ring pairs.
• Digital trunk port 1 receive and transmit Tip / Ring pairs.

Connector J6 (DCH)
A 26 pin D-type connector, used to connect the DDP card to MSDL or
QPC757 external D-channel handlers.

System capacity and performance

Physical capacity
Each DDP card occupies one slot on the network shelf. It supports two digital
trunk circuits and two network loops. The total number of DDP cards per
system is limited by the number of network loops, physical capacity of the
shelf, number of DTI/PRI interfaces allowed by the software and the range of
DCH addresses.

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D-Channel capacity
The software configuration for the NTBK51AA DDCH is similar to the
MSDL. It is both physical and logical, and supports D-Channel functionality
only.

The system has a total capacity of 16 addresses (Device Addresses or

DNUM) that can be reserved for DCHI card, MSDL card or DDCH card. One
exception is DNUM 0 which is commonly assigned to the System Monitor.

No two different D-Channel providers can share the same DNUM. Hence, the
combined maximum number of DCHI, MSDL and DDCH cards in the system
is 16.

The DCHI and DDCH have two D-Channel units, the MSDL has four.
Therefore the total number of D-Channels is derived by the following
formula:
Total_Num_DCH-Units = Num_DCHIx2 + Num_DDCHx2 + Num_MSDLx4

Therefore, Total_Num_DCH-Units in any given system is between 0-63.

CPU capacity
Using a NT512 DDP card instead of DTI/PRI cards does not increase the load
on the system CPU. The DDP replaces an ENET card and two DTI/PRI cards,
it emulates the ENET card and the overall CPU capacity is not impacted by
usage of DDP card instead of a DTI/PRI card.

Power requirements
Table 17 on page 85 lists the power requirements for the DDP card.

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Table 17
DDP power requirements

Voltage Source Current

DDP (without DDP (with

NTBK51AA) NTBK51AA)

+5V Backplane 3A 3.8A

+12V Backplane 25mA 75mA

-12V Backplane 25mA 75mA

Total Power (Maximum) 15.6W 20.8W

Testability and diagnostics

The DDP card supports all current QPC720 testing and maintenance
functions through the following procedures:
• Self test upon power up or reset;
• Signaling test performed in the LD 30;
• Loopback tests, self tests, and continuity tests performed by LD 60 and
LD 45;
• The D-Channel (MSDL, DCHI, DDCH) maintenance is supported by
LD 96.

NT5D12 Cable requirements

This section lists the types of cable used and the lengths required for internal
and external NT5D12 DDP connections.

Note 1: No additional cabling is required for nB+D configurations.

Multiple DDPs and the D-channel are associated through software in
LD 17.

Note 2: A detailed discussion of each type of DDP cable listed below

follows.

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New DDP cable assemblies include:

• System Trunk Tip/Ring Cables
— NT5D16AA
— NT5D17AA
— QCAD133

• DDP to QPC471/QPC775 Clock Controller Cables

— NTCG03AA
— NTCG03AB
— NTCG03AC
— NTCG03AD

• DDP to DCHI cables

— NTCK46AA
— NTCK46AB
— NTCK46AC
— NTCK46AD

• DDP to MSDL cables

— NTCK80AA
— NTCK80AB
— NTCK80AC
— NTCK80AD

Trunk Tip/Ring cables

NT5D16AA
The NT5D16AA (8 ft.) is a 100Ω cable for systems equipped with an I/O
filter panel, connecting the 9 pin D-type TRK port on the DDP faceplate to
the I/O filter.

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Note: On the I/O panel side, this cable is equipped with a monitor
bantam plug and a 15 pin D-type trunk connector mounted on a small
PCB. There are no bantam plugs on the DDP faceplate.

Figure 25
NT5D16AA

J3
P0
P5

J2
J3
P1
8 ft.
J2

Connector P5 - 9-pin, male, D-type (J5 on the DDP faceplate)

Connector P0: J2 - Monitor Bantam Plug, J3 - 15-pin, male, D-type
Connector P1; J2 - Monitor Bantam Plug, J3 - 15-pin, male D-type

Note:
This cable is only used in systems
equipped with I/O filter.

Table 18 lists the pin attributes for the NT5D16AA cable.

Table 18
NT5D16AA cable pins (Part 1 of 2)

DDP I/O Panel

Cable Name Description Color pins (J5) pins (J2, J3)

0 T-PRI0TX Trunk 0 Transmit Tip Black J5-1 P0J3-1

P0J2-3

0 R-PRI0TX Trunk 0 Transmit Ring Red J5-2 P0J3-9

P0J2-9

0 T-PRI0RX Trunk 0 Receive Tip Black J5-3 P0J3-3

P0J2-4

0 R-PRI0RX Trunk 0 Receive Ring White J5-4 P0J3-11

P0J2-10

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Table 18
NT5D16AA cable pins (Part 2 of 2)

DDP I/O Panel

Cable Name Description Color pins (J5) pins (J2, J3)

0 GND Shield Wire Bare N/C Case P0

0 GND Shield Wire Bare N/C Case P0

1 T-PRI1TX Trunk 1 Transmit Tip Black J5-5 P1J3-1

P1J2-3

1 R-PRI1TX Trunk 1 Transmit Ring Red J5-6 P1J3-9

P1J2-9

1 T-PRI1RX Trunk 1 Receive Tip Black J5-7 P1J3-3

P1J2-4

1 R-PRI1RX Trunk 1 Receive Ring White J5-8 P1J3-11

P1J2-10

1 GND Shield Wire Bare N/C Case P1

1 GND Shield Wire Bare N/C Case P1

Reference clock cables

The NTCG03AA (14 ft.), NTCG03AB (2.8 ft.), NTCG03AC (4.0 ft.), or
NTCG03AD (7 ft.) is a DDP card to Clock Controller cable, connecting each
of the CLK0 or CLK1 ports on the DDP faceplate to the primary or secondary
source ports on Clock Controller card 0 or 1.

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Figure 26
NTCG03AA, NTCG03AB, NTCG03AC, or NTCG03AD

P1 P2
14, 7, 4, or 2.8 ft.

Connector P1 - 4 pin, male, RJ11 (DDP faceplate)

Connector P2 - 9 pin, male, D-type (Clock Controller)

Note:
Includes an RJ11<-->9 pin D-type adaptor.

MSDL/DCHI cables

External DCHI cable

The NTCK46 cable connects the DDP card to the QPC757 DCHI D-Channel
Handler card. The cable is available in four different sizes:
• NTCK46AA (6 ft.) - DDP to DCHI cable
• NTCK46AB (18 ft.) - DDP to DCHI cable
• NTCK46AC (35 ft.) - DDP to DCHI cable
• NTCK46AD (50 ft.) - DDP to DCHI cable

Figure 27
NTCK46AA, NTCK46AB, NTCK46AC, NTCK46AD

P2
P1
P3
6, 18, 35 or 50 ft.

Connector P1 - 26 pin, male, D-type (DDP faceplate)

Connector P2 - 25 pin, male, D-type (DCHI port 0)
Connector P3 - 25 pin, male, D-type (DCHI port 1)

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External MSDL cable

The NTCK80 cable connects the DDP card to the NT6D80 MSDL card. The
cable is available in four different sizes:
• NTCK80AA (6 ft.) - DDP to MSDL cable
• NTCK80AB (18 ft.) - DDP to MSDL cable
• NTCK80AC (35 ft.) - DDP to MSDL cable
• NTCK80AD (50 ft.) - DDP to MSDL cable

Figure 28
NTCK80AA, NTCK80AB, NTCK80AC, NTCK80AD

P2
P1
P3
6, 18, 35 or 50 ft.

Connector P1 - 26 pin, male, D-type (DDP faceplate)

Connector P2 - 26 pin, SCSI (MSDL port 0)
Connector P3 - 26 pin, SCSI (MSDL port 1)

Cable diagrams
Figure 29 on page 91 provides an example of a typical cabling configuration
for the DDP. Please note that these figures are representational only, and are
not intended to show the relational card slot position of the various cards.

Figure 29 on page 91 shows a typical DDP cabling for a system Option with
an I/O panel, with the connection between the I/O panel and a Network
Channel Terminating Equipment (NCTE).

Note: Since there exists several clock cabling options, none has been
represented in the diagram. Please refer to “Clock configurations” on
page 94 for a description on each available option.

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Figure 29
DDP cable for systems with an I/O panel

Switch
Clock
Controllers

for possible
Leds
clock cabling
NTCG03 cables options, refer
clk0
Port 0
to the
clk1 "Clocking
configurations"
clk0
Port 1
chapter
clk1

J5 I/O Panel
NT5D16AA cable
NCTE
Trk QCAD133 cable

QCAD133 cable

J6 NTCK80 cable (to MSDL) or

NTCK46 cable (to DCHI)
NT6D80 MSDL,
DCH or
QPC757 DCHI

Clock
There are two types of clock operation - tracking mode and free-run mode.

Tracking mode
In tracking mode, the DDP loop supplies an external clock reference to a
clock controller. Two DDP loops can operate in tracking mode, with one
defined as the primary reference source for clock synchronization, the other

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defined as the secondary reference source. The secondary reference acts as a

back-up to the primary reference.

As shown in Figure 30 on page 92, a system with dual CPUs can have two
clock controllers (CC-0 and CC-1). One clock controller acts as a back-up to
the other. Lock the clock controllers to the reference clock.

Figure 30
Clock Controller primary and secondary tracking

Clock
Controller 0

J1
Primary
Primary REF 1 J2
clocking
source Primary J3
Reference
Primary
REF 2
Clock Controller
Secondary Backup
Secondary REF 1
clocking
source Secondary Clock
Reference Controller 1

Secondary
REF 2 J1

J2

J3

553-7401

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Free run (non-tracking) mode

The clock synchronization of the system can operate in free-run mode if:
• no loop is defined as the primary or secondary clock reference,
• the primary and secondary references are disabled, or
• the primary and secondary references are in local (near end) alarm.

Reference clock errors

The system software checks at intervals of 1 to 15 minutes to see if a clock
controller or reference-clock error has occurred. (The interval of this check
can be configured in LD 73.)

In tracking mode, at any one time, there is one active clock controller which
is tracking on one reference clock. If a clock controller error is detected, the
system switches to the back-up clock controller, without affecting which
reference clock is being tracked.

A reference-clock error occurs when there is a problem with the clock driver
or with the reference clock at the far end. If the clock controller detects a
reference-clock error, the reference clocks are switched.

Automatic clock recovery

A command for automatic clock recovery can be selected in LD 60 with the
command EREF.

A DDP loop is disabled when it enters a local-alarm condition. If the local

alarm is cleared, the loop is enabled automatically. When the loop is enabled,
clock tracking is restored in the following conditions:
• If the loop is assigned as the primary reference clock but the clock
controller is tracking on the secondary reference or in free-run mode, it
is restored to tracking on primary.

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• If the loop is assigned as the secondary reference clock but the clock
controller is in free-run mode, it is restored to tracking on secondary.
• If the clock check indicates the switch is in free-run mode:

— Tracking is restored to the primary reference clock if defined.

— If the primary reference is disabled or in local alarm, tracking is

restored to the secondary reference clock if defined.
Note: If the system is put into free-run mode by the craftsperson, it
resumes tracking on a reference clock unless the clock-switching option
is disabled (LD 60, command MREF), or the reference clock is
“undefined” in the database.

Automatic clock switching

If the EREF command is selected in LD 60, tracking on the primary or
secondary reference clock is automatically switched in the following manner:
• If software is unable to track on the assigned primary reference clock, it
switches to the secondary reference clock and sends appropriate DTC
maintenance messages.
• If software is unable to track on the assigned secondary reference clock,
it switches to free run.

Clock configurations
Clock Controllers can be used in a single or a dual CPU system.

A single CPU system has one Clock Controller card. This card can receive
reference clocks from two sources referred to as the primary and secondary
sources. These two sources can originate from a PRI, DTI, etc. PRI cards such
as the QPC720 are capable of supplying two references of the same clock
source. These are known as Ref1 (available at J1) and Ref2 (available at J2)
on the QPC720.

The NT5D12 card is capable of supplying two references from each clock
source, i.e., four references in total. NT5D12 can thus supply Clk0 and Clk1
from Port 0 and Clk0 and Clk1 from Port 1. Either Port 0 or Port 1 can

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originate the primary source, as shown in Figure 31 through Figure 34 on

page 98 to 101.

There is one new Clock Controller cable required for the new DDP card,
which is available in four sizes; this is the NTCG03AA/AB/AC/AD. Refer to
“Reference clock cables” on page 88 for more information.

Table 19 on page 95 summarizes the clock options. Table 20 page 96

explains the options in more detail.

Table 19
Clock Controller options- summary

CC Option CPU Type Notes

Option 1 Single Ref from P0 on Clk0

Ref from P1 on Clk0

Option 2 Dual Ref from P0 on Clk0

Ref from P0 on Clk1

Option 3 Dual Ref from P1 on Clk0

Ref from P1 on Clk1

Option 4 Dual Ref from P0 on Clk0

Ref from P0 on Clk1

Ref from P1 on Clk0

Ref from P1 on Clk1

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Table 20
Clock Controller options - description (Part 1 of 2)

Clock Option Notes

Option 1 This option provides a single CPU system with 2 clock

sources derived from the 2 ports of the DDP.

Connector Clk0 provides a clock source from Port 0.

Connector Clk0 provides a clock source from Port 1.

Refer to Figure 31 "Clock Controller - Option 1"

Option 2 This option provides a Dual CPU system with 2

references of a clock source derived from port 0 of the
DDP.

Connector Clk0 provides a Ref 1 clock source from

Port 0.

Connector Clk1 provides a Ref 2 clock source from

Port 0.

Refer to Figure 32 "Clock Controller - Option 2"

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Table 20
Clock Controller options - description (Part 2 of 2)

Clock Option Notes

Option 3 This option provides a Dual CPU system with 2

references of a clock source derived from port 1 of the
DDP.

Connector Clk0 provides a Ref 1 clock source from Port

1.

Connector Clk1 provides a Ref 2 clock source from Port

1.

Refer to Figure 33 "Clock Controller - Option 3"

Option 4 This option provides a Dual CPU system with 2

references from each clock source derived from the
DDP.

Connector Clk0 provides a Ref 1 clock source from Port

0.

Connector Clk1 provides a Ref 2 clock source from Port

0.

Connector Clk0 provides a Ref 1 clock source from Port

1.
Connector Clk1 provides a Ref 2 clock source from Port
1.

Refer to Figure 34 "Clock Controller - Option 4"

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Figure 31
Clock Controller - Option 1

DDP
Clk 0 CC for CPU
Secondary Ref
J1 Sec
Port 0
Secondary Reference Clk 1 Primary Ref
J2 Pri

Clk 0

Primary Reference
Port 1 Clk 1

One Reference from each port

553-AAA0079

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 ISDN Primary Rate Interface equipment overview Page 99 of 396

Figure 32
Clock Controller - Option 2

DDP 1
CC for CPU0
Clk 0

Primary Reference Port 0 J1 Sec

Clk 1 Primary Ref 1
J2 Pri

Clk 0
CC for CPU1
Port 1 Clk 1
J1 Sec
Primary
Ref 2
J2 Pri

DDP 2
Clk 0
Secondary Reference Secondary Ref 1
Port 0 Clk 1
Secondary Ref 2

Clk 0

Port 1
Clk 1

J1 Ref 1
Secondary Ref1
A QPC720 may
be configured
QPC720
as an alternative J2 Ref 2
to DDP2 Secondary Ref 2

Both References from Port 0

553-AAA0080

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Figure 33
Clock Controller - Option 3

DDP1
CC for CPU0
Clk 0

J1 Sec
Port 0 Clk 1 Primary Ref 1
J2 Pri

Clk 0
Primary Reference CC for CPU1
Port 1
Clk 1
J1 Sec
Primary Ref 2 J2 Pri

DDP2

Clk 0

Port 0 Clk 1

Clk 0
Secondary Ref 1
Secondary Reference
Port 1 Clk 1 Secondary Ref 2

J1 Ref 1

A QPC720 may Secondary Ref 1

be configured QPC720 J2 Ref 2
as an alternative
to DDP2
Secondary Ref 2

Both References from Port 1

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Figure 34
Clock Controller - Option 4

DDP CC for CPU0

Clk 0 Secondary Ref 1

J1 Sec

Port 0 Primary Ref 1 J2 Pri

Clk 1
Primary Reference

CC for CPU1
Clk 0
Secondary Ref 2
J1 Sec
Secondary Reference Port 1 Primary Ref 2 J2 Pri
Clk 1

Both References from both ports

553-AAA0082

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118

Page 103 of 396

DCH installation

Contents
The section contains information on the following topics:
Install the NT6D11AB, NT6D11AE, NT6D11AF DCH . . . . . . . . . . . 103
Install the NT6D11AB, NT6D11AE, NT6D11AF DCH . . . . . . . . . . . 103
Set up the NT6D11AB, NT6D11AE, NT6D11AF DCHI . . . . . . . . . . 104
DIP switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
Protocol selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Valid switch combinations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
Jumper settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107
Port addressing modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109
Port address switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111
Install the NT6D11AB, NT6D11AE, NT6D11AF DCHI. . . . . . . . . . . 112
Remove the NT6D11AB, NT6D11AE, NT6D11AF DCH. . . . . . . . . . 113
Install the QPC757 DCH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
Port address switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116
D-channel parameter downloading. . . . . . . . . . . . . . . . . . . . . . . . . . 117
Remove the QPC757 DCHI . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Install the NT6D11AB, NT6D11AE, NT6D11AF DCH

Installation procedures for the NT6D11AB, NT6D11AE, and NT6D11AE
DCHI cards are the same for all Large Systems. These instructions apply to
hardware both for primary and backup D-channels. D-channel lines must be
conditioned for 64K before D-channels can be brought up.

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Note: To configure J1, the asynchronous port on the DCHI card, refer to
the documentation of the application being interfaced, and to Circuit
Card: Description and Installation (553-3001-211). J1 configuration is
not described in this NTP.

Set up the NT6D11AB, NT6D11AE, NT6D11AF DCHI

DIP switch settings

The NT6D11AB/AE/AF has three sets of DIP switches. Each port has its own
bank of 10 DIP switches (SW1 & SW2) to select the port address (8 bits) and
mode of operation (2 bits). SW1 is used for port 0 settings, SW2 is used for
port 1 settings. SW3 is used to select the D-channel protocol. Port 0 is used
to select whether the asynchronous ESDI port is be disabled or not.
Port 1 is used to select the standard or expanded D-channel addressing mode
on the NT6D11AB/AE/AF.

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The DIP switches are located as shown by Figure 35.

Figure 35
NT6D11 DIP switches

SW3
1 2 SW1
1 10
SW2
1 10
PORT 0

PORT 1

553-7349

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Protocol selection
SW3 is used to select the D-channel protocol, as shown by Table 21.

Note: The setting must be 1 for ISDN applications.

Table 21
Protocol selection switch settings

Protocol Switch Setting

SW3.1 SW3.2

DPNSS1 0 0

ISDN 1 1

Valid switch combinations

The following are the only allowable switch setting combinations (not
including address switch settings).

Port 0
Port 0 can be configured as asynchronous ESDI, or disabled. If the port is
configured as disabled, it will not be visible to the system CPU. Refer to
Table 22.

Table 22
Port 0 settings

Mode Switch setting

SW1.1 SW1.2 SW3.1 SW3.2

Asynchronous ESDI 1 0 0 0

Asynchronous ESDI 1 0 1 1

Port disabled 1 1 - -

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Port 1
The following are the only valid emulation mode combinations. If the port is
configured as disabled, it will not be visible to the system CPU. Refer to
Table 23.

Note: The ISDN emulation must be selected.

Table 23
Port 1 settings

Mode Emulates Switch setting

SW2.1 SW2.2 SW3.1 SW3.2

DPNSS1 NT5K35 0 0 0 0

ISDN NT6D11 0 0 1 1

Expanded NT5K75 0 1 0 0
DPNSS1

Port disabled 1 1 - -

Jumper settings
The NT6D11AB/AE/AF has two banks of option straps, one for each port.
These select between DCE and DTE operation and whether the signalling
interface is RS232 or RS422. Refer to Figure 36 on page 108 and Figure 37
on page 109.

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Figure 36
NT6D11 DCH with ISL high-speed programming jumper settings

DCE RS-232
DTE RS-422
PORT 0
DCE RS-232
DTE RS-422

DCE RS-232
DTE RS-422
PORT 1
DCE RS-232
DTE RS-422

553-7350

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Figure 37
NT6D11 DCH with ISL low-speed programming jumper settings

DCE RS-232
DTE RS-422
PORT 0
DCE RS-232
DTE RS-422

DCE RS-232
DTE RS-422
PORT 1
DCE RS-232
DTE RS-422

553-7351

Port addressing modes

Port 0 Mode selection

Port 0 is used to select whether the asynchronous ESDI port is be disabled or
not. Refer to Table 24.

Note: The asynchronous ESDI port must be set to “disabled”.

Table 24 (Part 1 of 2)
Port 0 mode selection

Port Mode Switch Setting

SW1.1 SW1.2

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Table 24 (Part 2 of 2)
Port 0 mode selection

Not used 0 -

Asynchronous ESDI 1 0

Port disabled 1 1

Port 1 mode selection

Port 1 is used to select the standard or expanded D-channel addressing mode
on the NT6D11AB/AE/AF. Refer to Table 25.

Table 25
Port 1 mode selection

Port Mode Switch Setting

SW2.1 SW2.2
Synchronous, D-channel, standard 0 0
addressing

Note: THIS SELECTION MUST BE

MADE FOR ISDN.
Synchronous, D-channel, expanded 0 1
addressing
Not used 1 0
Port disabled 1 1

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Port address switch settings

Port address switch settings in the standard mode, for ISDN

Table 26 depicts the port address switch settings that apply to SW1 or SW2,
the D-channel port, for ISDN mode.

Table 26
Port address switch settings for ISDN (Part 1 of 2)

Port Address Switch Setting

Half Group No. Device No.

S3 S4 S5 S6 S7 S8 S9 S10

0 0 0 0 0 0 0 0 x

1 0 0 0 0 0 0 1 x

2 0 0 0 0 0 1 0 x

3 0 0 0 0 0 1 1 x

4 0 0 0 0 1 0 0 x

5 0 0 0 0 1 0 1 x

6 0 0 0 0 1 1 0 x

7 0 0 0 0 1 1 1 x

8 0 0 0 1 0 0 0 x

9 0 0 0 1 0 0 1 x

10 0 0 0 1 0 1 0 x

11 0 0 0 1 0 1 1 x

12 0 0 0 1 1 0 0 x

13 0 0 0 1 1 0 1 x

14 0 0 0 1 1 1 0 x

15 0 0 1

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Table 26
Port address switch settings for ISDN (Part 2 of 2)

Port Address Switch Setting

Half Group No. Device No.

S3 S4 S5 S6 S7 S8 S9 S10

16-31 0 0 1

32-47 0 1 0

48-63 0 1 1

64-79 1 0 0

80-95 1 0 1

96-111 1 1 0

112-127 1 1 1

Install the NT6D11AB, NT6D11AE, NT6D11AF DCHI

Follow Procedure 1 to install the NT6D11 DCH on the Large System.

Procedure 1
Install the NT6D11AB, NT6D11AE, NT6D11AF DCH
1 Determine the cabinet and shelf location for the circuit pack being
installed.
The NT6D11AB, NT6D11AE, or NT6D11AF DCHI card can be installed
in any slot appropriate for an I/O port card on a Network shelf. (The
NT6D11 DCHI card can be located on the Common Equipment shelf only
on single-CPU switches.)
2 Unpack and inspect the card.
3 Set the option switches on the DCHI card. For PRA capability, set port J2
to odd. For ISL capability, set port J2 for high speed or low speed
operation (See Figure 36, Figure 37, and Table 26 starting on page 108).

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4 Set faceplate toggle switch to DISABLE.

5 Install the DCHI card into the assigned shelf and slot.
6 Connect DCHI port J2 to the NT8D72AB or NT8D72BA PRI port J5 with
a QCAD328A cable.
7 Set faceplate toggle switch to ENABLE.
8 Coordinate the start-up and verification of the DCHI with the start-up of
the PRI.
9 Enable the DCHI card using LD 96, command ENL DCHI N.

End of Procedure

Remove the NT6D11AB, NT6D11AE, NT6D11AF DCH

Use Procedure 2 to remove the NT6D11AB, NT6D11AE, NT6D11AF DCH
from a Large System.

CAUTION
The NT6D11AB, NT6D11AE, NT6D11AF DCH must be software
disabled before it is hardware disabled, or initialization will occur.

Procedure 2
Remove the NT6D11AB, NT6D11AE, NT6D11AF DCH
1 Disable the NT6D11AB, NT6D11AE, NT6D11AF DCHI using
LD 96, command DIS DCHI N.
2 If asynchronous port J1 is enabled, it must also be software disabled,
using LD 37, or initialization will occur.
3 If the circuit pack is being completely removed, not replaced, remove data
from memory.
4 Determine the cabinet and shelf location of the card to be removed.
5 Set faceplate toggle switch to DISABLE.
6 Disconnect NT6D11AB, NT6D11AE, NT6D11AF DCHI cables.
7 Remove NT6D11AB, NT6D11AE, NT6D11AF DCHI card.

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8 Pack and store the card.

End of Procedure

Install the QPC757 DCH

Installation procedures for the QPC757 DCHI card are the same for all
Large Systems. These procedures apply to both primary and backup
D-channels. See Figure 38 on page page 115, Figure 39 on page 116 and
Table 27 on page 116, for option switch settings per port number of the DCHI
card, in Primary Rate Interface mode.

Use Procedure 3 to install the QPC757 DCHI card on Large Systems.

Procedure 3
Install the QPC757 DCHI
1 Determine the cabinet and shelf location of the circuit card to be installed.
The QPC757 DCHI card can be installed in any slot appropriate for an
I/O port card on a network shelf. For single CPU systems only, the
QPC757 DCHI card can be located on the Common Equipment (CE)
shelf.
2 Unpack and inspect the card.
3 Set option switches and jumper plugs on the DCHI card. For PRI
capability, set port J2 to odd. For ISL capability, set port J2 for high-speed
or low-speed programming.
4 Set faceplate toggle switch to DISABLE.
5 Install DCHI card into the assigned shelf or module and slot.
6 Run and connect DCHI cables: connect QPC757 J2 to QPC720 PRI J5
with a QCAD328A cable.
7 Set faceplate toggle switch to ENABLE.
8 Enable the loop in LD 60.
9 Coordinate start-up and verification of the DCHI with the start-up of the
PRI.

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 DCH installation Page 115 of 396

10 Enable the DCHI card using LD 96, command ENL DCH x.

End of Procedure

Figure 38
QPC757 option and PRI/ISL high-speed programming switch settings

QPC757C DCHI

1 2 34
Port address
switch
Jumper
Jumpers for port
J1, the asynch DCE RS-232
port. The port is DTE HS (RS-422)
always the lower,
even number. DCE RS-232
Place jumper
DTE HS (RS-422)
plugs in sockets
as shown. This
DCE RS-232 selects the DTE
Jumpers for port DTE HS (RS-422) and RS-232
J2, the D-channel options required
port. The port is DCE RS-232 for the D-channel.
always the higher, DTE HS (RS-422)
odd number.

553-1384

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Figure 39
QPC757 option and PRI/ISL low-speed programming switch settings

DCE RS-232
DTE RS-422
PORT 0
DCE RS-232
DTE RS-422

DCE RS-232
DTE RS-422
PORT 1
DCE RS-232
DTE RS-422

553-7351

Port address switch settings

Table 27 shows the port address switch settings that apply to SW1, SW2 (the
D-channel port), SW3, and SW4.

Table 27
D-channel port address switch settings for PRI (Part 1 of 2)

Port Address Switch Settings

Port Number

J1 J2 SW1 SW2 SW3 SW4

0 1 Off Off Off Off

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Table 27
D-channel port address switch settings for PRI (Part 2 of 2)

Port Address Switch Settings

Port Number

2 2 Off Off On Off

4 5 Off On Off Off

6 7 Off On On Off

8 9 On Off Off Off

10 11 On Off On Off

12 13 On On Off Off

14 15 On On On Off

D-channel parameter downloading

The system software automatically downloads new parameters to each
D-channel Interface (DCHI) circuit card upon SYSLOAD. When this occurs,
the D-channel is temporarily disabled and then automatically reenabled.

Three situations require manual disabling and enabling of each DCHI to

ensure parameter downloading:
• Performing a parallel load and switching over to the second CPU
• Following an alarm condition for the T1 loop carrying the D-channel (but
the D-channel is still operational)
• Following SYSLOAD when using ISDN Signaling Link (ISL)

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Remove the QPC757 DCHI

Use Procedure 4 to remove the QPC757 DCHI card from Large Systems.

CAUTION
The QPC757 DCH must be software disabled before
it is hardware disabled to prevent initialization

Procedure 4
Remove the QPC757 DCH
1 Disable the QPC757 DCHI using LD 96, command DIS DCH x.
2 Disable asynchronous port J1 in LD 48 to prevent initialization.
3 Disable loop in LD 60.
4 If the circuit card is being removed, not replaced, remove data from
memory.
5 Determine the cabinet and shelf location of the card to be removed.
6 Set faceplate toggle switch to DISABLE.
7 Disconnect QPC757 DCHI cables.
8 Remove QPC757 DCHI card.
9 Pack and store circuit card.

End of Procedure

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NTBK51 DDCH installation and removal

Contents
This section contains information on the following topics:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119
Install NTBK51 DDCH on NT5D97 dual-port DTI2/PRI2 card . . . . . 120
Remove NTBK51 DDCH from NT5D12 dual-port DTI/PRI. . . . . . . . 122

Introduction
This chapter provides installation and removal procedures for the NTBK51
Downloadable D-channel Daughterboard, the NT5D97 dual-port DTI2/PRI2
card, and the NT5D12 dual-port 1.5 Mb DTI/PRI card on all Large Systems.

Note: The only version of the NTBK51 DDCH that can be used on an
NT5D97, or NT5D12 installed on a Large System, is the NTBK51AA.
Vintage NTBK51BA cannot be used, due to a different pin configuration
(the NTBK51BA is used on Small Systems.)

Before beginning an installation:

• Consult the Spares Planning (553-3001-153) document and follow the

instructions.
• Bring spares of all cables and boards.
• Remember that test procedures require a 24-hour minimum bit error-rate
testing before being used.

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• Remember that either the DDCH, the MSDL, or NT5D97, or NT5D12

card can be installed first. However, NT5D97 PRI2 loops, and NT5D12
PRI loops, must be configured in software before defining DCH links.

Install NTBK51 DDCH on NT5D97 dual-port DTI2/PRI2 card

Installation procedures for the NTBK51 DDCH are the same for all Large
Systems. Use Procedure 5 below.

The DDCH can be mounted on any NT5D97 DDP2 card. Set the address for
the DDCH (see the switch settings section to set the address). If a DDCH is
present on a DDP2 card then an external D-channel should not be connected
to J6. If a DDCH is present the LED “DDCH” lights up.

CAUTION
The static discharge bracelet located inside the
cabinet must be worn before handling circuit cards.
Failure to wear the bracelet can result in damage to
the circuit cards.

Procedure 5
Install the NTBK51 on the NT5D97 dual-port DTI2/PRI2 card
1 Unpack and inspect the DDCH daughterboard.
The DDCH comes with four stand-offs so that it can be mounted onto the
NT5D97. These are easily pushed into four corresponding mounting
holes on the DDP2.
2 Mount the DDCH so that it mates with P1 and P2 on the NT5D97
motherboard.
Note: P 1 and P 2 contain (40+30) sockets as the NTBK51AA respective
pins (40+30), which enables the technician to “mate” them. This is
applicable for the NT5D97AA/AB. The NT5D97AD has 44+34 sockets. In
order to place the NTBK51AA (40+30 pins), place the NTBK51AA inside
P1 and P2. Start from their lower edge. (The remaining “free” sockets
(4+4) in P1 and P2 are in their upper edge.)

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 NTBK51 DDCH installation and removal Page 121 of 396

3 Set the DDP2 ENB/DIS faceplate switch to Enable (ON). The DDCH LED
then flashes three times.

End of Procedure

Remove NTBK51 DDCH from NT5D97 dual-port

DTI2/PRI2 card
Removal procedures for the NTBK51 DDCH are the same for all Large
Systems.

CAUTION
A static discharge bracelet must be worn before
handling circuit cards. Failure to wear the bracelet
can result in damage to the circuit cards.

The NTBK51 can only be removed when it is disabled in software. Both ports
of the associated DDP2 card must be disabled. Follow the steps in
Procedure 6 on page 121 to remove the NTBK51 from the NT5D97 dual-port
DTI2/PRI2 card.

Procedure 6
Remove the NTBK51 from the NT5D97 dual-port DTI2/PRI2 card
1 Set the DDP2 ENB/DIS faceplate switch to Disable (OFF).
2 Remove the DDP2 and the DDCH.

End of Procedure

Install NTBK51 DDCH on NT5D12 dual-port DTI/PRI

Installation procedures for the NTBK51 DDCH are the same for all Large
Systems.

Set the address for the DDCH (see the switch settings section to set the
address). If a DDCH is present on a DDP card then an external D-channel
should not be connected to J6. If a DDCH is present, the LED “DCH” lights
up.

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CAUTION — Service Interruption

A static discharge bracelet must be worn before handling
circuit cards. Failure to wear the bracelet can result in
damage to the circuit cards.

The DDCH can be mounted on any DDP card. Follow the steps in
Procedure 7 to install the NTBK51 on the NT5D12 dual-port DTI/PRI card.

Procedure 7
Install the NTBK51 DDCH on the NT5D12 dual-port DTI/PRI
1 Unpack and inspect the DDCH daughterboard.
The DDCH comes with four stand-offs so that it can be mounted onto the
DDP. These are easily pushed into four corresponding mounting holes on
the DDP.
2 Mount the NTBK51 DDCH so that it mates correctly with P1 and P2 on the
NT5D12 DDP motherboard.

End of Procedure

Remove NTBK51 DDCH from NT5D12 dual-port DTI/PRI

Removal procedures for the NTBK51 DDCH are the same for all Large
Systems.

CAUTION
A static discharge bracelet must be worn before
handling circuit cards. Failure to wear the bracelet
can result in damage to the circuit cards.

The DDCH can only be removed when it is disabled in software. Both ports
of the associated DDP card must be disabled. Follow the steps in Procedure 8
on page 123 to remove the NTBK51 from the NT5D12 dual-port DTI/PRI
card.

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 NTBK51 DDCH installation and removal Page 123 of 396

Procedure 8
Remove the NTBK51 from the NT5D12 dual-port DTI/PRI card
1 Disable the faceplate switch on the DDP.
2 Remove the DDP and DDCH.

End of Procedure

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130

Page 125 of 396

MSDL installation for all systems

Contents
The section contains information on the following topics:
Install the MSDL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
Replace the MSDL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

Install the MSDL

Installation procedures for the MSDL card are the same for Large Systems.
Use Procedure 9 below. See Figure 40 on page 127, and Table 28 on
page 127 for the port and interface switch settings.

The MSDL card goes into the following slots:

Half Group, Single CPU/Network Module slot 1–8, 13
Group
Multi Group Network Module slot 5–14

Refer to Software Input/Output: System Messages (553-3001-411) and

Circuit Card: Description and Installation (553-3001-211) for more
information.

Procedure 9
Install the MSDL card
1 Determine module and slot location for the MSDL card. Unpack and
inspect the MSDL card.
2 Set the MSDL switch settings to correspond to Table 28, and Figure 40.

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3 Insert the MSDL card into the selected card slot of the module following
the card guides.
4 Observe the red LED on the MSDL faceplate. If it turns on, flashes three
times, and stays on continuously, the MSDL is operating correctly but is
not yet enabled.
If the LED turns on and stays on continuously without flashing three
times, the card can be defective. Go to step 8.
5 Connect the appropriate cable between the NT6D80 and the PRI card
MSDL interface.
6 Enable the MSDL card in LD96.
7 Unplug the MSDL card and reinsert it. If the red LED still does not flash
three times, leave the card installed for approximately 10 minutes to allow
the card to be initialized.
8 After 10 minutes unplug the card, reinsert it and if the card still does not
flash three times, the card is defective and must be replaced.

End of Procedure

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 MSDL installation for all systems Page 127 of 396

Figure 40
MSDL card layout

Card Address Select Switches

Ones Tens
23 23

456

456
901

901
78 78

S9 S10
LED
DCE DTE
O1 2 3 4 5 6 7 8
N
O 1 2 3 4 5 6 7 8 9 10
N
422
232
S4 S8
Port 0

DCE DTE
O1 2 3 4 5 6 7 8 O 1 2 3 4 5 6 7 8 9 10 422
Port 1 N N
232
S3 S7

Port 2 DCE DTE

O1 2 3 4 5 6 7 8
N
O 1 2 3 4 5 6 7 8 9 10
N
422
232
S2 S6
Port 3

DCE DTE
O1 2 3 4 5 6 7 8 O 1 2 3 4 5 6 7 8 9 10 422
Monitor N N
232
Port S1 S5

553-5431

Table 28
MSDL switch settings (Part 1 of 2)

Port 0—SW4 Port 0—SW8

o o o o o o o o o o o o o o o o o o
RS-232-D ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

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Table 28
MSDL switch settings (Part 2 of 2)

RS-422-A o o o o o o o o o o o o o o o o o o
DTE ff ff ff ff ff ff ff ff n n n n n n n n n n

RS-422-A o o o o o o o o o o o o o o o o o o
DCE n n n n n n n n ff ff ff ff ff ff ff ff ff ff

Port 1—SW3 Port 1—SW7

o o o o o o o o o o o o o o o o o o
RS-232-D ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

RS-422-A o o o o o o o o o o o o o o o o o o
DTE ff ff ff ff ff ff ff ff n n n n n n n n n n

RS-422-A o o o o o o o o o o o o o o o o o o
DCE n n n n n n n n ff ff ff ff ff ff ff ff ff ff

Port 2—SW2 Port 2—SW6

o o o o o o o o o o o o o o o o o o
RS-232-D ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

RS-422-A o o o o o o o o o o o o o o o o o o
DTE ff ff ff ff ff ff ff ff n n n n n n n n n n

RS-422-A o o o o o o o o o o o o o o o o o o
DCE n n n n n n n n ff ff ff ff ff ff ff ff ff ff

Port 3—SW1 Port 3—SW5

o o o o o o o o o o o o o o o o o o
RS-232-D ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff

RS-422-A o o o o o o o o o o o o o o o o o o
DTE ff ff ff ff ff ff ff ff n n n n n n n n n n

RS-422-A o o o o o o o o o o o o o o o o o o
DCE n n n n n n n n ff ff ff ff ff ff ff ff ff ff

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 MSDL installation for all systems Page 129 of 396

Replace the MSDL

Replacement procedures for the MSDL card are the same for all Large
Systems. Use Procedure 10 below.

Procedure 10
Replace the MSDL card
1 Disable the MSDL card in LD 96.
2 Disconnect MSDL to PRI cables.
3 Remove the faulty MSDL card.
4 Unpack and inspect the new MSDL card.
5 Set the MSDL switch settings to correspond to Table 28 and Figure 40.
6 Insert the new MSDL card into the selected card slot of the module
following the card guides.
7 Observe the red LED on the MSDL faceplate. If it turns on, flashes three
times, and stays on continuously, the MSDL is operating correctly but is
not yet enabled.
If the LED turns on and stays on continuously without flashing three
times, the card can be defective. Go to step 11.
8 Connect the appropriate cable between the NT6D80 and the PRI card
MSDL interface.
9 Enable the MSDL card in LD 96.
10 Unplug the MSDL card and reinsert it. If the red LED still does not flash
three times, leave the card installed for approximately 10 minutes to allow
the card to be initialized.
11 After 10 minutes unplug the card and reinsert it. If the red LED does not
flash three times, the card is defective and must be replaced.

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553-3001-201 Standard 3.00 August 2005

158

Page 131 of 396

NT8D72 and QPC720 PRI card installation

Contents
The section contains information on the following topics:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
PRI circuit pack locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
Cable requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
Switch settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
Install NT8D72 and QPC720 PRI cards on Large Systems . . . . . . . . . 154
Remove NT8D72 and QPC720 PRI cards from Large Systems. . . . . . 156
Install an additional network shelf . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Introduction
This chapter contains information on how to install the 2.0 Mb NT8D72 and
the 1.5 Mb QPC720 PRI cards on all Large Systems.

Information on how to install the dual-port cards NT5D97 and NT5D12 is

contained in this document.

PRI circuit pack locations

The PRI circuit pack occupies two adjacent slots on a shelf. As many as five
circuit packs can be plugged into an empty Network shelf, along with a Power
Converter circuit pack. Specific locations will depend on available space.

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Note 1: Due to physical width, Bus Terminating Units (BTUs) and PRIs
cannot fit next to each other on a shelf.

Note 2: This chapter includes instructions for installing an additional

network shelf on a system (when no vacant Network slots are available
to install PRI packs, additional network shelves can replace Intelligent
Peripheral Equipment shelves located on the rear of the Common
Equipment or Disk shelves). Refer to “Install an additional network
shelf” on page 157.

Cable requirements
Shielded 22 AWG (0.644 mm) cables are recommended for connecting the
PRI to the cross-connect point. This cable consists of two twisted-pair
conductors.

The transmit and the receive pairs must be enclosed in a polyvinyl jacket.
This type of cable is commonly referred to as "6-conductor" cable. The cable
should be grounded at the cross-connect point.

In addition to twisted-pair conductors, 75-ohm coaxial cable can also be used

to provide connection to the office repeater or line terminating unit (LTU).

For manufacture cables of lengths different than those of the standard cables
provided, see "Non-standard cables" on page 385 of this practice.

For the 2.0 Mb NT8D72 PRI card, see Figure 41 on page 133, Figure 42 on
page 134, Figure 43 on page 135, and Figure 44 on page 133 for Half Group
and Single Group cabling arrangements applying to the system; also, refer to
Table 52 on page 144. For the 2.0 NT8D72 on a Multi Group arrangement,
see Figures 45 and 46 on page 137; also refer to Table 30 on page 146.

For the 1.5 Mb QPC720 PRI card on Half Group and Single Group systems,
see Figure 47 on page 139, Figure 48 on page 140, Figure 49 on page 141,
also, refer to Table 31 on page 147. For the QPC720 on Multi Group systems,
see Figures 51 and 52 on page 143; also refer to Table 32 on page 149.

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 NT8D72 and QPC720 PRI card installation Page 133 of 396

Figure 41
NT8D72(Half Group cabling) on Half and Single Group systems without an echo canceller

NT8D79AA to PRI Card

(Secondary reference)
NT8D72AA
PRI Card
(Primary reference)
NT8D79AA
REF1 J1 J1
QPC471
Clock
J2
Controller
No connection J3 0

REF2 J2 No connection

QCAD328A QPC757
D-CH J5 J2 DCHI

NT8D85AB Network
LOOP J3 J2 Card

2Mb NT8D7205 repeater

J4 (Note 2)
stream
Cabinet
I/O Panel DS-1
(Note 1) Cross-Connect
Terminal
RS-232 J6 No connection

Note 1: Maximum cable distance from PRI card to cross connect is 200 m (655 ft) .
Note 2: Maximum cable distance from PRI card to repeater is 229 m (750 ft).
553-1389

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Page 134 of 396 NT8D72 and QPC720 PRI card installation

Figure 42
NT8D72 (Half Group cabling) for Half and Single Group systems, with an echo canceller

NT8D79AA to PRI Card

(Secondary reference)
NT8D72
PRI Card
(Primary
reference)
NT8D79AA
REF1 J1 J1
QPC471
Clock
J2
Controller
No connection J3 0

REF2 J2 No connection

NTND26 NT6D80
D-CH J5 J2

QCAD124 QPC414
LOOP J3 J2 (Note 3)
22 AWG ABAM

QCAD128 or Echo Canceller

QCAD133 QCAD133 LD-1
T1 J4 T1 (Note 2)
Cabinet
I/O Panel (Note 1) DS-1
Cross-Connect
Terminal
QCAD129 RS232 Central
RS232 J6 RS232 Office

Cabinet
I/O Panel
Note 1: Maximum cable distance from PRI card to DS-1 cross connect is 200 m (655 ft).
Note 2: Maximum cable distance from PRI card to LD-1 is 229 m (750 ft).
Note 3: QPC720 does not interface with NT8D04 Superloop Network Card. 553-1390

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 NT8D72 and QPC720 PRI card installation Page 135 of 396

Figure 43
NT8D72 (Single Group cabling) for Half and Single Group systems, without an echo canceller

NT8D79AA to PRI Card

(Secondary reference)
NT8D72AA
PRI Card NT8D79AA
NT8D79AA
(Primary reference)
NT8D79AA
REF1 J1 J1 QPC775
J2 Clock
Controller
J3 0

NT8D79AA
REF2 J2 J1 QPC775
Clock
J2
Controller
J3 1
QCAD125

QCAD328A
D-CH J5 J2 QPC757
DCHI

NT8D85AB Network
LOOP J3 J2
Card

2Mb NT8D7207 NT8D7205 repeater

J4 (Note 2)
stream
Cabinet
I/O Panel DS-1
(Note 1) Cross-Connect
Terminal
RS-232 J6 No connection

Note 1: Maximum cable distance from PRI card to cross connect is 200 m (655 ft) .
Note 2: Maximum cable distance from PRI card to repeater is 229 m (750 ft).

553-1391

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Figure 44
NT8D72 (Single Group cabling) for Half and Single Group systems, with an echo canceller

NT8D79AA to PRI Card

(Secondary reference)
NT8D72AA
PRI Card NT8D79AA NT8D79AA
(Primary
reference)
NT8D79AA
REF1 J1 J1 QPC775
Clock
J2
Controller
J3 0

NT8D79AA
REF2 J2 J1 QPC775
Clock
J2
Controller
J3 1
QCAD125
QCAD328A or
NTND26 QPC757
D-CH J5 J2 or
NT6D80

QCAD124 QPC414
LOOP J3 J2 (Note 3)
22 AWG ABAM

QCAD128 or Echo Canceller

T1 QCAD133 QCAD133 LD-1
J4 T1 (Note 2)
Cabinet
I/O Panel (Note 1) DS-1
Cross-Connect
Terminal
QCAD129 RS232 Central
RS232 J6 RS232 Office

Cabinet
I/O Panel
Note 1: Maximum cable distance from PRI card to DS-1 cross connect is 200 m (655 ft).
Note 2: Maximum cable distance from PRI card to LD-1 is 229 m (750 ft).
Note 3: QPC720 does not interface with NT8D04 Superloop Network Card. 553-1392

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 NT8D72 and QPC720 PRI card installation Page 137 of 396

Figure 45
NT8D72 (Multi Group cabling) for Multi Group systems without an echo canceller

QCAD130 to PRI Card

PRI Card (Secondary reference)
(Primary
reference)
QCAD130
REF1 J1 J1 QPC471
Clock
J2
Controller
J3 0
SCG0 QPC417
QCAD110
QCAD130 SCG1 Junctor
REF2 J2 J1 QPC471
Clock
J2
Controller
J3 1

QCAD328A to DCHI or
NTND26 to MSDL
D-CH J5 J2 DCHI

QCAD124 QPC414
LOOP J3 J2 (Note 3)

T1 QCAD128 QCAD133 LD-1

J4 (Note 2)
Cabinet
I/O Panel DS-1
(Note 1) Cross-Connect
Terminal Central
Office
RS232 J6 No connection

Note 1: Maximum cable distance from PRI card to DS-1 cross connect is 200 m (655 ft).
Note 2: Maximum cable distance from PRI card to LD-1 is 229 m (750 ft).
Note 3: QPC720 does not interface with NT8D04 Superloop Network Card. 553-7366

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Figure 46
NT8D72 (Multi Group cabling) for Multi Group systems with an echo canceller

QCAD130 to PRI Card

PRI Card
(Secondary reference)
(Primary
reference)
QCAD130
REF1 J1 J1 QPC471
Clock
J2
Controller
J3 0
SCG0 QPC417
QCAD110
QCAD130 SCG1 Junctor
REF2 J2 J1 QPC471
Clock
J2
Controller
J3 1

QCAD328A to DCHI or
NTND26 to MSDL
D-CH J5 J2 DCHI

QCAD124 QPC414
LOOP J3 J2 (Note 3)
22 AWG ABAM

Echo Canceller
T1 NT8D7207 QCAD133 LD-1
J4 T1 (Note 2)
Cabinet
I/O Panel (Note 1) DS-1
Cross-Connect
Terminal
QCAD129 RS232 Central
RS232 J6 RS232 Office

Cabinet
I/O Panel
Note 1: Maximum cable distance from PRI card to DS-1 cross connect is 200 m (655 ft).
Note 2: Maximum cable distance from PRI card to LD-1 is 229 m (750 ft).
Note 3: QPC720 does not interface with NT8D04 Superloop Network Card. 553-7367

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 NT8D72 and QPC720 PRI card installation Page 139 of 396

Figure 47
QPC720 (Half Group cabling) for Multi Group systems without an echo canceller

NT8D79AA or QCAD130 to PRI Card

(Secondary reference)
QPC720
PRI Card
(Primary reference) NT8D79AA
or QCAD130
REF1 J1 J1
QPC471
Clock
J2
Controller
No connection J3 0

REF2 J2 No connection

QCAD328A to QPC757 QPC757

D-CH J5 J2 DCHI
NTND26 to MSDL NT6D80
MSDL

NT8D85AB Network
LOOP J3 J2 Card
(Note 3)

2Mb NT8D7205 repeater

J4 (Note 2)
stream
Cabinet
I/O Panel DS-1
(Note 1) Cross-Connect
Terminal
RS-232 J6 No connection

Note 1: Maximum cable distance from PRI card to cross connect is 200 m (655 ft) .
Note 2: Maximum cable distance from PRI card to repeater is 229 m (750 ft).
Note 3: QPC720 does not interface with NT8D04 Superloop Network Card.
553-1389.1

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Page 140 of 396 NT8D72 and QPC720 PRI card installation

Figure 48
QPC720 (Half Group cabling) for Multi Group systems with an echo canceller

NT8D79AA or QCAD130 to PRI Card

(Secondary reference)
QPC720PRI Card
(Primary
reference) NT8D79AA
or
QCAD130
REF1 J1 J1
QPC471
Clock
J2
Controller
No connection J3 0

REF2 J2 No connection

NTND26 NT6D80
D-CH J5 J2

QCAD124 QPC414
LOOP J3 J2 (Note 3)
22 AWG ABAM

QCAD128 or Echo Canceller

QCAD133 QCAD133 LD-1
T1 J4 T1 (Note 2)
Cabinet
I/O Panel (Note 1) DS-1
Cross-Connect
Terminal
QCAD129 RS232 Central
RS232 J6 RS232 Office

Cabinet
I/O Panel
Note 1: Maximum cable distance from PRI card to DS-1 cross connect is 200 m (655 ft).
Note 2: Maximum cable distance from PRI card to LD-1 is 229 m (750 ft).
Note 3: QPC720 does not interface with NT8D04 Superloop Network Card. 553-1390.1

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 NT8D72 and QPC720 PRI card installation Page 141 of 396

Figure 49
QPC720 (Single Group cabling) for Multi Group systems without an echo canceller

NT8D79AA to PRI Card

(Secondary reference)
QPC720
PRI Card NT8D79AA
NT8D79AA
(Primary reference)
NT8D79AA
REF1 J1 J1 QPC775
J2 Clock
Controller
J3 0

NT8D79AA
REF2 J2 J1 QPC775
Clock
J2
Controller
J3 1
QCAD125

QCAD328A
D-CH J5 J2 QPC757
DCHI

NT8D85AB Network
LOOP J3 J2
Card
(Note 3)

2Mb NT8D7207 NT8D7205 repeater

J4 (Note 2)
stream
Cabinet
I/O Panel DS-1
(Note 1) Cross-Connect
Terminal
RS-232 J6 No connection

Note 1: Maximum cable distance from PRI card to cross connect is 200 m (655 ft) .
Note 2: Maximum cable distance from PRI card to repeater is 229 m (750 ft).
Note 3: QPC720 does not interface with NT8D04 Superloop Network Card.
553-1391.1

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Figure 50
QPC720 (Single Group cabling) for Multi Group systems with an echo canceller

NT8D79AA to PRI Card

(Secondary reference)
QPC720
PRI Card NT8D79AA NT8D79AA
(Primary
reference)
NT8D79AA
REF1 J1 J1 QPC775
Clock
J2
Controller
J3 0

NT8D79AA
REF2 J2 J1 QPC775
Clock
J2
Controller
J3 1
QCAD125
QCAD328A or
NTND26 QPC757
D-CH J5 J2 or
NT6D80

QCAD124 QPC414
LOOP J3 J2 (Note 3)
22 AWG ABAM

QCAD128 or Echo Canceller

T1 QCAD133 QCAD133 LD-1
J4 T1 (Note 2)
Cabinet
I/O Panel (Note 1) DS-1
Cross-Connect
Terminal
QCAD129 RS232 Central
RS232 J6 RS232 Office

Cabinet
I/O Panel
Note 1: Maximum cable distance from PRI card to DS-1 cross connect is 200 m (655 ft).
Note 2: Maximum cable distance from PRI card to LD-1 is 229 m (750 ft).
Note 3: QPC720 does not interface with NT8D04 Superloop Network Card. 553-1392

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 NT8D72 and QPC720 PRI card installation Page 143 of 396

Figure 51
QPC720 Multi Group cabling without an echo canceller

QCAD130 to PRI Card

PRI Card
(Secondary reference)
(Primary
reference)
QCAD130
REF1 J1 J1 QPC471
Clock
J2
Controller
J3 0
SCG0 QPC417
QCAD110
QCAD130 SCG1 Junctor
REF2 J2 J1 QPC471
Clock
J2
Controller
J3 1

QCAD328A to DCHI or
NTND26 to MSDL
D-CH J5 J2 DCHI

QCAD124 QPC414
LOOP J3 J2 (Note 3)

T1 QCAD128 QCAD133 LD-1

J4 (Note 2)
Cabinet
I/O Panel DS-1
(Note 1) Cross-Connect
Terminal Central
Office
RS232 J6 No connection

Note 1: Maximum cable distance from PRI card to DS-1 cross connect is 200 m (655 ft).
Note 2: Maximum cable distance from PRI card to LD-1 is 229 m (750 ft).
Note 3: QPC720 does not interface with NT8D04 Superloop Network Card. 553-7366.1

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Figure 52
QPC720 Multi Group cabling with an echo canceller

QCAD130 to PRI Card

PRI Card
(Secondary reference)
(Primary
reference)
QCAD130
REF1 J1 J1 QPC471
Clock
J2
Controller
J3 0
SCG0 QPC417
QCAD110
QCAD130 SCG1 Junctor
REF2 J2 J1 QPC471
Clock
J2
Controller
J3 1

QCAD328A to DCHI or
NTND26 to MSDL
D-CH J5 J2 DCHI

QCAD124 QPC414
LOOP J3 J2 (Note 3)
22 AWG ABAM

Echo Canceller
T1 NT8D7207 QCAD133 LD-1
J4 T1 (Note 2)
Cabinet
I/O Panel (Note 1) DS-1
Cross-Connect
Terminal
QCAD129 RS232 Central
RS232 J6 RS232 Office

Cabinet
I/O Panel
Note 1: Maximum cable distance from PRI card to DS-1 cross connect is 200 m (655 ft).
Note 2: Maximum cable distance from PRI card to LD-1 is 229 m (750 ft).
Note 3: QPC720 does not interface with NT8D04 Superloop Network Card. 553-7367.1

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 NT8D72 and QPC720 PRI card installation Page 145 of 396

Table 29
Cable for the NT8D72 PRI card for Half and Single Group systems (Part 1 of 2)

Cable From Des Con To Des Con To

NTND26 PRI card J5 MSDL

NT8D79AA PRI card J1 Clock CC-0 J2 Only when primary

controller clock source.

NT8D79AA PRI card J1 Clock CC-0 J1 Only when

controller secondary clock
source.

For single-group only

NT8D79AA PRI card J2 Clock CC-1 J2 Only when primary

controller clock source.

NT8D79AA PRI card J2 Clock CC-1 J1 Only when

controller secondary clock
source.

QCAD125 Clock CC-0 J3 Clock CC-1 J3 Clock Controller

controller controller back-up.

NT8D85AB PRI card J3 Network Run directly to

Network pack.

QCAD328A PRI card J2 DCHI J2 Run directly to

DCHI card.

NTND26 PRI card J5 MSDL

NT8D7207 PRI card J4 I/O Panel

RS-232 I/O Panel Echo

canceller

RS-232 PRI card J6 Echo

canceller

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Table 29
Cable for the NT8D72 PRI card for Half and Single Group systems (Part 2 of 2)

Cable From Des Con To Des Con To

NT8D7205 I/O Panel cross Run via cabinet

connect I/O panel to
cross-connect
terminal from
switch.

Note: No additional cabling is required for multiple PRIs. The

D-channel is associated through software in LD 17 (prompt PRI).

Table 30
Cable for the NT8D72 PRI card for Multi Group systems (Part 1 of 2)

Cable From Des. Con. To Des. Con. Notes

QCAD130 PRI card J1 Clock CC-0 1

controller

QCAD130 PRI card J1 Clock CC-0 2

controller

QCAD130 PRI card J2 Clock CC-1 1

controller

QCAD130 PRI card J2 Clock CC-1 2

controller

QCAD110 Clock CC-0 J3 Junctor board JCTR J11 3

controller

QCAD110 Clock CC-1 J3 Junctor board JCTR J12

controller

QCAD124 PRI card J3 Network 4

QCAD328A PRI card J5 DCHI card J2 5

NTND26 PRI card J5 MSDL

QCAD128 PRI card J4 I/O Panel 6

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 NT8D72 and QPC720 PRI card installation Page 147 of 396

Table 30
Cable for the NT8D72 PRI card for Multi Group systems (Part 2 of 2)

QCAD133 I/O Panel Patch Panel 6

QCAD129 PRI card J6 I/O Panel 6

RS-232 I/O Panel Echo

Canceller

RS-232 PRI card J6 Echo 7

Canceller

QCAD133 PRI card J4 Patch Panel 7

RS-232 PRI card J6 Echo 7

Canceller

Note 1: Only when primary clock source.

Note 2: Only when secondary clock source.

Note 3: Multi-group junctor board connection.

Note 4: Run to connector on network pack.

Note 5: Run directly to DCHI card.

Note 6: Run by means of cabinet I/O panel to CSU, echo canceller, or cross connect terminal.

Note 7: Run by means of cabinet I/O panel to cross-connect terminal or echo canceller from
non shielded system.

Note 8: No additional cabling is required for multiple PRIs. The D-channel is associated
through software in LD17, prompt PRI.

Table 31
Cable for the QPC720 PRI card for Half and Multi Group systems (Part 1 of 3)

Cable From Des. Con. To Des. Con. Comments

For half group only

QCAD130 QPC720 J1 QPC471/ CC-0 J2 Only when primary

NT8D79xx QPC775 clock source.

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Table 31
Cable for the QPC720 PRI card for Half and Multi Group systems (Part 2 of 3)

Cable From Des. Con. To Des. Con. Comments

QCAD130 QPC720 J1 QPC471/ CC-0 J1 Only when secondary

NT8D79xx QPC775 clock source.

NTND26 QPC720 J5 NT6D80

For single group only

QCAD130 QPC720 J2 QPC471/ CC-1 J2 Only when primary

NT8D79xx QPC775 clock source.

QCAD130 QPC720 J2 QPC471/ CC-1 J1 Only when secondary

NT8D79xx QPC775 clock source.

QCAD125 QPC471/ CC-0 J3 QPC471/ CC-1 J3 Clock controller

NT8D75xx QPC775 QPC775 back-up.

QCAD124 QPC720 J3 Network Run directly to

NT8D85xx network card.

QCAD328A QPC720 J5 QPC757 J2 Run directly to DCHI

card.

NTND26 QPC720 J5 NT6D80

QCAD133 I/O Panel Patch Run via cabinet I/O

panel panel to CSU, Echo
Canceller, or
cross-connect
terminal.

QCAD129 QPC720 J6 I/O Panel

RS-232 I/O Panel Echo

Canceller

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 NT8D72 and QPC720 PRI card installation Page 149 of 396

Table 31
Cable for the QPC720 PRI card for Half and Multi Group systems (Part 3 of 3)

Cable From Des. Con. To Des. Con. Comments

RS-232 QPC720 J6 Echo

Canceller

QCAD133 QPC720 J4 Patch Run via cabinet I/O

NT8D83xx panel panel to
cross-connect
terminal or Echo
Canceller from
non-shielded system.

Table 32
Cable for the QPC720 PRI card on Multi Group systems (Part 1 of 3)

Cable From Des. Con. To Des. Con. Notes

QCAD130 QPC720 J1 QPC471 CC-0 Only when

NT8D79xx QCP775 primary clock
source

QCAD130 QPC720 J1 QPC471 CC-0 Only when

NT8D79xx QCP775 secondary clock
source

QCAD130 QPC720 J2 QPC471 CC-1 Only when

NT8D79xx QCP775 primary clock
source

QCAD130 QPC720 J2 QPC471 CC-1 Only when

NT8D79xx QCP775 secondary clock
source

QCAD110 QPC471 CC-0 J3 QPC417 JCTR J11 Multi-group

NT8D74xx QCP775 junctor board
connection

QCAD110 QPC471 CC-1 J3 QPC417 JCTR J12

NT8D74xx QCP775

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Page 150 of 396 NT8D72 and QPC720 PRI card installation

Table 32
Cable for the QPC720 PRI card on Multi Group systems (Part 2 of 3)

Cable From Des. Con. To Des. Con. Notes

QCAD124 QPC720 J3 Network Run to connector

NT8D85xx on network pack

QCAD328 QPC720 J5 QPC757 J2 Run directly to

DCHI card

NTND26 QPC720 J5 NT6D80

QCAD128 QPC720 J4 I/O Run via cabinet

NT8D83xx Panel I/O panel to CSU,
Echo Canceller,
or cross-connect
terminal

QCAD133 I/O Patch Run via cabinet

NT8D83xx Panel Panel I/O panel to CSU,
Echo Canceller,
or cross-connect
terminal

QCAD129 QPC720 J6 I/O Run via cabinet

NT9J93xx Panel I/O panel to CSU,
Echo Canceller,
or cross-connect
terminal

RS-232 I/O Echo

Panel Canceller

RS-232 QPC720 J6 Echo Run via cabinet

Canceller I/O panel to Echo
Canceller or
cross-connect
terminal from
non-shielded
system

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 NT8D72 and QPC720 PRI card installation Page 151 of 396

Table 32
Cable for the QPC720 PRI card on Multi Group systems (Part 3 of 3)

Cable From Des. Con. To Des. Con. Notes

QCAD133 QPC720 J4 Patch Run via cabinet

NT8D83xx Panel I/O panel to Echo
Canceller or
cross-connect
terminal from
non-shielded
system

RS-232 QPC720 J6 Echo Run via cabinet

Canceller I/O panel to Echo
Canceller or
cross-connect
terminal from
non-shielded
system

Switch settings
Figure 53 on page 152 shows the NT8D72AA, NT8D72AB, and NT8D72BA
PRI DIP switch settings for Large Systems. Figure 54 on page 153 shows the
QPC720 PRI switch settings for Large Systems.

Table 33 on page 153 indicates the Transmission equalization switch settings

for the NT8D72 and QPC720 PRI cards for Large Systems.

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Figure 53
NT8D72AA, NT8D72AB, NT8D72BA PRI DIP switch settings for Large Systems

NT8D72AA, NT8D72AB

75 ohm switch setting 120 ohm switch setting

(default)
OFF OFF
OR
ON ON
1 2 1 2
S1 S2 S1 S2

NT8D72BA

75 ohm switch setting 120 ohm switch setting

(default)

OFF OFF
OR

ON ON
1 2 1 2
S1 S2 S1 S2

553-7533

Note: For EuroISDN applications, use the default setting (120 ohms).

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 NT8D72 and QPC720 PRI card installation Page 153 of 396

Figure 54
QPC720 switch settings for Half and Single Group systems

SW2

7-pole
(See transmission
equalization
switch settings)

SW3

8-pole
(All OFF except for PRI mode,
see transmission equalization
switch settings)

553-1503

Table 33
NT8D72 and QPC720 PRI transmission equalization switch settings for Large Systems
(Part 1 of 2)

Switch S2 settings To repeater facility To cross-connect point

5 on 0 - 45 m 0 - 30 m
(0 - 150 ft) (0 - 100 ft)

2, 4, 6 on 46 - 135 m 31 - 100 m
(151 - 450 ft) (101 - 355 ft)

1, 3, 7 on 136 - 225 m 101 - 200 m

(451 - 750 ft) (356 - 655 ft)

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Page 154 of 396 NT8D72 and QPC720 PRI card installation

Table 33
NT8D72 and QPC720 PRI transmission equalization switch settings for Large Systems
(Part 2 of 2)

Switch 3 options for PRI with ESF

SW3-1 on = extended superframe format (ESF)

off = superframe format (SF)

Note 1: All positions on S2 (location B22) are OFF except as shown under the column labeled
“Switch S2 settings.” The 8-pole SW3 (location E37) positions are OFF except for SW3-1 as
shown for “Switch 3 option for DTI with ESF.”

Note 2: For D2, D3, or D4 framing formats (superframe formats), set all SW3 options to OFF.

Note 3: For the DTI with ESF option, you must set the framing format as ESF with the DLOP
prompt in LD17 before you set SW3-1 on the card.

Install NT8D72 and QPC720 PRI cards on Large Systems

Use Procedure 11 to install the NT8D72 and QPC720 PRI cards on
Large Systems.

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 NT8D72 and QPC720 PRI card installation Page 155 of 396

Procedure 11
Install the NT8D72 and QPC720 PRI on Large Systems
1 Determine the cabinet and shelf location of the circuit card to be installed.
The following slots can be used if they are not required for other cards.

Table 34
Shelf and slot location of NT8D72 and QPC720 for Half Group and
Single Group systems

System Shelf Slot

Half Group, NT6D39 CPU/NET 3–8 Note 1

Single Group 18 Note 3

NT8D35 DTI Exp Cube 2–3 Note 1

5–14 Note 1

NT8D47 RPE Cube 1, 11, 12

Multi Group Core 0-3

Network Module 5–10, 13–14

Note 1: DTI/PRI packs require two slots. The slot indicated is the
maximum slot that the pack resides in. For example, the slot 14 pack uses
slots 13 and 14.

Note 2: The DTI/PRI pack cannot be installed in slot 11. The pack would
come in contact with the BTU installed between slots 11 and 12.

Note 3: Slot 18 is only available on CPU shelf, which has no MDU/FDU.

Note 4: DTI/PRI pack could reside in slots 10 and 11, but cannot reside in
slots 11 and 12 because of powering restrictions.

2 Unpack and inspect the PRI cards.

3 Set the option switches on the PRI circuit cards.
4 Install the PRI circuit card in the assigned shelf and slot.
5 Install the network circuit card (if no network loop connection is available).
6 If required, install I/O adapters in the I/O panel.
7 Run and connect the PRI cables.

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Page 156 of 396 NT8D72 and QPC720 PRI card installation

8 If required, install connecting blocks at MDF or wall-mounted

cross-connect terminal.
9 If required, designate connecting blocks at MDF or wall-mounted
cross-connect terminal.
10 If required, install CSU or Echo Canceller.
11 Cross-connect PRI circuits.
12 Add related office data into system memory. Refer to the work order.
13 Run PRI verification tests.

End of Procedure

Remove NT8D72 and QPC720 PRI cards from Large

Systems
Use Procedure 12 to remove the NT8D72 and QPC720 PRI cards from Large
Systems.

Procedure 12
Remove NT8D72 and QPC720 PRI cards from Large Systems
1 Disable the D-channel in LD 96.
2 Disable Network Loop using LD 60. The command is DISL x.
3 Remove the data from memory if the circuit card is being completely
removed, not replaced.
4 Determine the location of the circuit cards to be removed.
5 Remove cross connections at MDF to wall-mounted cross-connect
terminal.
6 Disconnect PRI cables at Echo Canceller and at carrier interface (for
example, Office Repeater and NCTE equipment).
7 Tag and disconnect cables from card. Rearrange Clock Controller card
cables if required. This will affect call processing on DTI/PRI loops.
8 Remove PRI and network circuit cards. If the other circuit of a dual
network card is in use, DO NOT remove the network card.

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 NT8D72 and QPC720 PRI card installation Page 157 of 396

9 Pack and store circuit card.

End of Procedure

Install an additional network shelf

Use Procedure 13 to install an additional network shelf, when additional shelf
space is required for PRI cards on Half Group and Single Group systems. A
QUD15 cooling unit is required for each additional shelf installed.

CAUTION
Do not place the circuit packs in the shelf until Step 7
is completed.

Procedure 13
Install an additional network shelf on Half Group and Single Group
systems
1 Determine the cabinet and shelf location of the Network shelf to be
installed.
2 Unpack and inspect the shelf.
3 Remove the existing left or right rear Intelligent Peripheral Equipment
(IPE) shelf (if required).
4 Install the additional Network shelf in the IPE (Step 3) location.
5 Install a QUD15 cooling unit directly below the Network shelf and secure
with four mounting screws.
6 Install and connect the QCAD172A power cable to the added QUD15
cooling unit as follows:
• If the added QUD15 is located below the left Network shelf, unplug
the C11 connector from the QCAD111 power harness that connects
to the existing left side QUD15.
• If the added QUD15 is located below the right Network shelf, unplug
the C21 connector from the QCAD111 power harness instead of the
C11.

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7 Plug the C11 or C21 connector into the single-ended connector of the
QCAD172A power cable.
8 Plug one of the two connectors at the other end of the C11 or C21
connector that was removed.
9 Plug the remaining connector of the QCAD172A power cable into the
added QUD15.
10 Adjust the QCAD111 power wiring harness, untie and then connect:
• the C17 power connection cable to the right rear Network shelf
• the C19 power connection cable to the left rear Network shelf
11 Install PRI trunks and enter related shelf and PRI office data into switch
memory.

End of Procedure

553-3001-201 Standard 3.00 August 2005

178

Page 159 of 396

NT5D97 Dual-port DTI2/PRI2

installation and removal

Contents
The section contains information on the following topics:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159
NT5D97 circuit card locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Port definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160
Case Scenarios for replacing a digital trunk NT8D72BA, QPC536E, or
NTCK43 by a DDP2 card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161
NT5D97AA/AB DIP switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . 161
Install the NT5D97 DDP2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 174
Remove the NT5D97 DDP2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
Configure the NT5D97 DDP2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Introduction
This section contains information required to install the NT5D97 Dual-port
DTI2/PRI2 (DDP2) card on Large Systems.

For installation and removal procedures for the NTBK51AA Downloadable

D-channel daughterboard, prefer to the section “NTBK51 DDCH installation
and removal” on page 119.

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Page 160 of 396 NT5D97 Dual-port DTI2/PRI2 installation and removal

NT5D97 circuit card locations

Each NT5D97 card requires one slot on a shelf. NT5D97 cards can be placed
in any card slot in the network bus.

Port definitions
Since the NT5D97 card is a dual-card, it equips two ports; these ports can be
defined in the following combinations:

Table 35
NT5D97AA/AB loops configuration

Loop 0

not configured DTI2 PRI2

Loop 1

not configured V V V

DTI2 V V V

PRI2 V V V

Table 36
NT5D97AD loops configuration

Loop 0

not configured DTI2 PRI2 DDCS

not configured V V V V
Loop 1

DTI2 V V V V

PRI2 V V V X

DDCS V V X V

Note: Each loop DPNSS can be defined in Normal or Extended

addressing mode.

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Case Scenarios for replacing a digital trunk NT8D72BA,

QPC536E, or NTCK43 by a DDP2 card
The following discussion describes possible scenarios when replacing a
digital trunk NT8D72BA PRI2 card or QPC536E DTI2 card or NTCK43
Dual PRI card configuration with a NT5D97 DDP2 card configuration.

Case 1 - The two ports of a QPC414 network card are connected to two digital
trunks.
In this case, the QPC414 and the two digital trunks are replaced by a single
DDP2 card, which is plugged into the network shelf in the QPC414 slot.

Case 2 - One port of the QPC414 card is connected to a digital trunk, and the
second is connected to a peripheral buffer. Both cards are in a network loop
location.
In this case, the QPC414 should not be removed. The digital trunk is removed
and the DDP2 card is plugged into one of the two empty slots.

Case 3 - The network shelf is full, one port of a QPC414 network card is
connected to a digital trunk, and the second is connected to a peripheral
buffer. This arrangement is repeated for another QPC414. The digital trunks
are located in a shelf that provides only power.
In this case, the peripheral buffers will have to be re-assigned, so that each
pair of buffers will use both ports of the same QPC414 card. The other
QPC414 card can then be replaced by the NT5D97 DDP2.

Note: If an NT8D72BA/NTCK43 card is being replaced by a DDP2

card, the D-channel Handler can be reconnected to the DDP2 card, or
removed if an onboard NTBK51DDCH card is used. Also, DIP Switches
in the NT5D97 must be set properly before insertion. NT5D97 has a
different DIP Switch setting from NTCK43AB. Refer to
“NT5D97AA/AB DIP switch settings” on page 161 for DIP switch
setting).

NT5D97AA/AB DIP switch settings

The NT5D97 DDP2 card is equipped with 6x2 sets of DIP switches for trunk
parameters settings for port0 and port1 respectively. Additionally, the DDP2

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card is equipped with one set of four DIP switches for the Ring Ground
setting. The NT5D97AA/AB has one set of eight DIP switches and
NT5D97AD has two sets of ten DIP switches for the D-channel Handler
parameters setting.

The DIP switches are used for the setting of default values of certain
parameters. Firmware reads the general purpose switches, which sets the
default values accordingly.

Table 37
DIP switch settings for NT5D97AA/AB

Trunks
Card Port 0 Port 1 Trunk 0 Trunk 1
0 and 1

ENB/DSB S1
mounted on the face plate

Ring Ground S2

MSDL S3

Tx Mode S4 S10

S5 S11

LBO Setting S6 S12

S7 S13

Receiver Interface S8 S14

General Purpose S9 S15

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Figure 55
DIP switches for NT5D97AA/AB

PORT 0 PORT 1
1 2 34 1 2 34
S9 Trunk Interface S15
J5
1 2 34 1 2 34
S8 Receiver Impedence S14

1 2 34 1 2 34
S7 Line S13

1 2 3 4 Build out 1 2 3 4
J6 S6 S12

1 2 3 4 Switches 1 2 3 4
S5 S11
Ring Ground
1 2 34 1 2 34 1 2 34
S2 S4 Transmission Mode S10

1 2 3 4 5 6 7 8
S3 DCH Mode and Address Select

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The following parameters are set by DIP switches. The boldface font shows
the factory set-up.

Trunk interface switches for NT5D97AA/AB

Impedance level and unit mode

The S9/S15 switch selects the impedance level and loop operation mode on
DEI2 OR PRI2. Refer to Table 38 on page 164.

Table 38
Impedance level and loop mode switch settings

Switch Description S9/S15 Switch Setting

1 Impedance level OFF - 120 ohm

ON - 75 ohm

2 Spare X

3 Spare X

4 Unit mode OFF - Loop operates in the DTI2 mode

ON - Loop operates in the PRI2 mode

Transmission mode
A per-trunk switch (S4/S10) provides a selection of the digital trunk interface
type. Refer to Table 39 on page 164.

Table 39
Impedance level and loop mode switch settings

Description S4/S10 switch settings

E1 OFF

Not used

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Line build out

A per-trunk set of three switches (S5/S11, S6/S12 and S7/S13) provides the
dB value for the line build out. Refer to Table 40 on page 165.

Note: Do not change this setup.

Table 40
Trunk interface line build out switch settings

Description Switch setting

S5/S11 S6/S12 S7/S13

0dB OFF OFF OFF

Receiver impedance
A per-trunk set of four DIP switches (S8/S14 provides selection between 75
or 120 ohm values. Refer toTable 41 on page 165.

Table 41
Trunk interface impedance switch settings

Description S8/S14 switch setting

75 ohm OFF OFF ON OFF

120 ohm OFF OFF OFF ON

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Ring ground switches for NT5D97AA/AB

A set of four DIP switches (S2) selects which Ring lines are connected to the
ground. Refer to Table 48 on page 171.

Table 42
Ring ground switch settings

Switch Description S2 switch settingS

1 Trunk 0 Transit OFF-Ring line is not grounded

ON- Ring line is grounded

2 Trunk 0 Receive OFF-Ring line is not grounded

ON- Ring line is grounded

3 Trunk 1 Transmit OFF-Ring line is not grounded

ON- Ring line is grounded

4 Trunk 1 Receive OFF-Ring line is not grounded

ON- Ring line is grounded

DCH Address select switch for NTBK51AA daughter board for

NT5D97AA/AB
In case of an on-board NTBK51AA D-channel daughterboard, a set of four
switches (S3) provide the daughterboard address. Refer to Table 50 on page
171.

Note: Switch 8 of S3 (S3-8) does not require a switch setting to select

between the on-board NTBK51AA D-channel daughterboard and an
external DCHI/MSDL. The NT5D97 detects when the on-board
NTBK51AA D-channel daughterboard is used.

Table 43
DCH mode and address switch settings

Switch Description S3 switch setting

1-4 D-channel daughterboard address See table

5-8 For future use OFF

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Table 51 on page 172 shows the possible selections of the NTBK51AA

D-channel.

Table 44
NTBK51AA daughterboard address select switch settings

Device
Address Switch Setting

0 OFF OFF OFF OFF

1 ON OFF OFF OFF

2 OFF ON OFF OFF

3 ON ON OFF OFF

4 OFF OFF ON OFF

5 ON OFF ON OFF

6 OFF ON ON OFF

7 ON ON ON OFF

8 OFF OFF OFF ON

9 ON OFF OFF ON

10 OFF ON OFF ON

11 ON ON OFF ON

12 OFF OFF ON ON

13 ON OFF ON ON

14 OFF ON ON ON

15 ON ON ON ON

Note 1: The system contains a maximum number of 16 DCHI, MSDL, and DDCH
devices. The Device Addresses are equivalent to the MSDL DNUM designations.

Note 2: Device address 0 is commonly assigned to the System TTYD Monitor.

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NT5D97AD DIP switch settings

The NT5D97 DDP2 card is equipped with 6x2 sets of DIP switches for trunk
parameters settings for port 0 and port 1 respectively. Additionally, the DDP2
card is equipped with one set of four DIP switches for the Ring Ground
setting. The NT5D97AA/AB has one set of eight DIP switches and
NT5D97AD has two sets of ten DIP switches for the D-channel Handler
parameters setting.

The DIP switches are used for the setting of default values of certain
parameters. Firmware reads the general purpose switches, which sets the
default values accordingly.

Table 45
DIP switch settings for NT5D97AD

Trunks
Card Port 0 Port 1 Trunk 0 Trunk 1
0 and 1

ENB/DSB S1
mounted on the face plate

Ring Ground S16

DPNSS S8 S9

MSDL S9

TX Mode S2 S10

S3 S13

LBO Setting S4 S14

S5 S15

Receiver Interface S6 S11

General Purpose S12 S7

Refer to DIP switch locations in Figure 56 on page 169.

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Figure 56
Dip switches locations for NT5D97AD

1 AB
NT5D97AD
S1 Daughter Board BA
NTBK51 17

P2
S9
1 2 3 4 5 6 7 8 9 10

1
BA
S8 22
1 2 3 4 5 6 7 8 9 10

P1
S7 S12
1 2 3 4 1 2 3 4

Backplane Connector P3
1
Face Plate

S6 S11
1 2 3 4 1 2 3 4

S16
1 2 3 4

S5 S15
1 2 3 4 1 2 3 4

S4 S14
1 2 3 4 1 2 3 4

S3 S13
1 2 3 4 1 2 3 4

S2 S10 Daughter Board

1 2 3 4 1 2 3 4 NTAG54 Not to scale 60 A B

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The following parameters are set by DIP switches. The boldface font shows
the factory set-up.

Trunk interface switches for NT5D97AD

Trunk 0 switches
Switch S12 gives the MPU information about its environment as shown in
Table 46.
Table 46
General purpose switches for NT5D97AD

Switch Description S9/S15 Switch Setting

S12_1 Impedance level OFF - 120 ohm

ON - 75 ohm

S12_2 Spare For future use

S12_3 Spare For future use

S12_4 Unit mode OFF - Unit operates in the DTI2 mode

ON - Unit operates in the PRI2 mode

Switch S2 selects the Transmission mode as shown in Table 47.

Table 47
TX mode switches for NT5D97AD

TX mode S2

E1 OFF

Not used ON

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Switch S3, S4, and S5 select LBO function as is Table 48.

Table 48
LBO switches for NT5D97AD

LBO setting S3 S4 S5

0dB OFF OFF OFF

7.5dB ON ON OFF

15dB ON OFF ON

Switch S6 selects the Receiver interface as in Table 49.

Table 49
Receiver interface switches for NT5D97AD

Impedance S6-1 S6-2 S6-3 S6-4

75 ohm OFF OFF ON OFF

120 οhm OFF OFF OFF ON

Trunk 1 switches for NT5D97AD

Table 50
Trunk 1 switches

Switch Function

S7 General Purpose...See Table 46 on page 170

S10 TX Mode...See Table 47 on page 170

S13, S14 & S15 LBO...See Table 48 on page 171

S11 RX Impedance...See Table 49 on page 171

Ring ground switches for NT5D97AD

Switch S16 selects which ring lines connect to ground. When set to ON, the
ring line is grounded as shown in Table 51.

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Table 51
Ring ground switch for NT5D97AD

Switch Line

S16_1 Trunk 0 Transmit

S16_2 Trunk 0 Receive

S16_3 Trunk 1 Transmit

S16_4 Trunk 1 Receive

DCH Address select switch for NTBK51AA daughter board for

NT5D97AD
Switch S9 selects the NTBK51AA DCH daughterboard address.

Switch S8 is not used when the NTBK51AA daughterboard is used. S8_1-10

can be set to OFF position as in Table 52.

Table 52
NTBK51AA DCH switches for NT5D97AD

Switch number Function

S9_1-4 DCH daughter card address

S9_5-8 Set to OFF

S9_9 Set to ON (NTBK51AA Mode)

S9_10 Set to ON (NTBK51AA Mode)

MSDL external card

Table 53 lists the switch numbers assigned for future use on the MSDL
external card.

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Table 53
Switch settings for MSDL external card

Switch number Function

S9_1-10 For future use

S8_1-10 For future use

Use Table 54 to set the card address.

Table 54
Switch setting for MSDL external card (Part 1 of 2)

Switch Setting

DNUM (LD 17) 1 2 3 4

0 OFF OFF OFF OFF

1 ON OFF OFF OFF

2 OFF ON OFF OFF

3 ON ON OFF OFF

4 OFF OFF ON OFF

5 ON OFF ON OFF

6 OFF ON ON OFF

7 ON ON ON OFF

8 OFF OFF OFF ON

9 ON OFF OFF ON

10 OFF ON OFF ON

11 ON ON OFF ON

12 OFF OFF ON ON

13 ON OFF ON ON

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Table 54
Switch setting for MSDL external card (Part 2 of 2)

Switch Setting

DNUM (LD 17) 1 2 3 4

14 OFF ON ON ON

15 ON ON ON ON

Install the NT5D97 DDP2

Use Procedure 14 to install the NT5D97 on Large Systems.

CAUTION
The static discharge bracelet located inside the
cabinet must be worn before handling circuit cards.
Failure to wear the bracelet can result in damage to
the circuit cards.

Procedure 14
Install the NT5D97 on Large Systems
1 Determine the cabinet and shelf location where the NT5D97 is to be
installed. The NT5D97 can be installed in any card slot in the Network
bus.
2 Unpack and inspect the NT5D97and cables.
3 If a DDCH is installed, refer to the section “NTBK51 DDCH installation and
removal” on page 119.
4 Set the option switches on the NT5D97 card before installation. Refer to
“NT5D97AA/AB DIP switch settings” on page 161.
The ENB/DIS (enable/disable faceplate switch) must be OFF (DIS) when
installing the NT5D97, otherwise a system initialize can occur. The
ENB/DIS on the NT5D97 corresponds to the faceplate switch on the
QPC414 Network card.
5 Install NT5D97 card in the assigned shelf and slot.

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6 Set the ENB/DIS faceplate switch to ON.

If the DDCH is installed, the DDCH LED should flash three times.
7 If required, install the I/O adapters in the I/O panel.
8 Run and connect the NT5D97 cables.

CAUTION
Clock Controller cables connecting the Clock
Controller and NT5D97 card must NOT be routed
through the center of the cabinet past the power
harness. Instead they should be routed around the
outside of the equipment shelves.

9 If required, install connecting blocks at the MDF or wall mounted

cross-connect terminal.
10 If required, designate connecting blocks at the MDF or wall mounted
cross-connect terminal.
11 If required, install a Network Channel Terminating Equipment (NCTE). or
Line Terminating Unit (LTU).
12 Add related office data into switch memory.
13 Enable faceplate switch S1. This is the “Loop Enable” switch.
The faceplate LEDs should go on for 4 seconds then go off and the
OOS, DIS and ACT LEDs should go on again and stay on.
IF DDCH is installed, the DCH LED should flash 3 times.
14 Run the PRI/DTI Verification Test.
15 Run the PRI status check.

End of Procedure

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Remove the NT5D97 DDP2

Use Procedure 15 to remove the NT5D97 from Large Systems.

CAUTION
The static discharge bracelet located inside the
cabinet must be worn before handling circuit cards.
Failure to wear the bracelet can result in damage to
the circuit cards.

Procedure 15
Remove the NT5D97 from Large Systems
1 Determine the cabinet and shelf location of the NT5D97 card to be
removed.
2 Disable the Network Loop using LD 60. The command is DISL “loop
number.”
The associated DCHI might have to be disabled first. The faceplate switch
ENB/DIS should not be disabled until both PRI2/DTI2 loops are disabled
first.
3 Remove data from memory, if the NT5D97 card is being completely
removed, not replaced.
4 Remove cross connections at the MDF to wall-mounted cross-connect
terminal.
5 Tag and disconnect cables from the card.
6 Rearrange Clock Controller cables if required.

CAUTION
Clock Controller cables connecting the Clock Controller and DDP2
card must NOT be routed through the center of the cabinet past the
power harness. Instead, they should be routed around the outside of the
equipment shelves.

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7 Remove the DDP2 card only if both loops are disabled. If the other circuit
of a DDP2 card is in use, DO NOT remove the card. The Faceplate switch
ENB/DIS must be in the OFF (DIS) position before the card is removed,
otherwise the system will initialize.
8 Pack and store the NT5D97 card and circuit card.

End of Procedure

Configure the NT5D97 DDP2

After the NT5D97 DDP2 is installed, configure the system using the same
procedures as the standard NT8D72BA PRI2.

Consider the following when configuring the NT5D97 DDP2 card:

• The system software allows four ports to be defined for the NT6D80
MSDL. The DDCH (NTBK51AA) card has only two ports, 0 and 1;
therefore, ports 2 and 3 must not be defined when using the NTBK51AA.
• Port 0 of the NTBK51AA can only be defined to work with Loop 0 of the
NT5D97 DDP2 card, and Port 1 of the NTBK51AA can only be defined
to work with Loop 1 of the NT5D97. This relationship must be reflected
when configuring a new DCH in LD 17 (in response to the DCHL
prompt, enter either 0 or 1 when specifying the loop number used by the
DCH).
• You cannot define one of the DDP2 loops for the NTBK51AA DDCH,
and the other loop for the NT6D11AF, NT5K75AA, and NT5K35AA
DCH card or the NT6D80 MSDL.
• When configuring the NT5D97 DDP2 in DTI2 outgoing dial pulse mode,
a Digit Outpulsing patch is required.

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192

Page 179 of 396

NT5D12 Dual-port DTI/PRI card

installation

Contents
The section contains information on the following topics:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
NT5D12 circuit card locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Port definitions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Scenarios for replacement of a digital trunk card (QPC720/QPC472)
by a DDP card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
NT5D12 switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
General Purpose Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Trunk interface switches. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182
Ring ground switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183
DCH mode and address select switches . . . . . . . . . . . . . . . . . . . . . . 184
Install the NT5D12 DDP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 188
Remove the NT5D12 DDP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Configure the NT5D12 DDP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Introduction
This section contains information required to install the NT5D12 1.5 Mb
DTI/PRI Dual-port (DDP) card on Large Systems.

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For installation and removal procedures for the NTBK51AA Downloadable

D-channel daughterboard, refer to the section “NTBK51 DDCH installation
and removal” on page 119.

NT5D12 circuit card locations

Each NT5D12 circuit card requires one slot on a shelf. NT5D12 cards can be
placed in any card slot in the network bus, subject to the cautionary note
below.

Port definitions
Since the NT5D12 card is dual-card, it equips two ports. These ports are
defined in the following combinations:

Port 0 Port 1

DTI DTI

DTI PRI

PRI DTI

PRI PRI

DTI Not configured

PRI Not configured

Not configured PRI

Not configured DTI

Scenarios for replacement of a digital trunk card

(QPC720/QPC472) by a DDP card
The following discussion describes possible scenarios when replacing a
digital trunk QPC720 PRI card or QPC472 DTI card configuration with a
NT5D12 DDP card configuration.

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Case 1 - The two ports of a QPC414 network card are connected to two digital
trunks.
In this case, the QPC414 and the two digital trunks are replaced by a single
DDP card, which is plugged into the CE shelf in the QPC414 slot.

Case 2 - One port of the QPC414 card is connected to a digital trunk, and the
second is connected to a peripheral buffer. Both cards are in the network loop
location.
In this case, the QPC414 should not be removed. The digital trunk is removed
and the DDP card is plugged into one of the two empty slots.

Case 3 - The CE shelf is full, one port of a QPC414 network card is connected
to a digital trunk, and the second is connected to a peripheral buffer. This
arrangement is repeated for another QPC414. The digital trunks are located
in a shelf that provides only power.
In this case, the peripheral buffers will have to be re-assigned, so that each
pair of buffers will use both ports of the same QPC414 card. The other
QPC414 card can then be replaced by the NT5D12 DDP.

Note in all cases - If a QPC720 card is being replaced by a DDP card, the
D-channel Handler or MSDL can be either reconnected to the DDP card, or
removed if an onboard NTBK51AA DDCH card is used.

NT5D12 switch settings

The NT5D12 card is equipped with 6x2 sets of DIP switches for trunk
parameters settings for port0 and port1 respectively. Additionally, the
NT5D12 card is equipped with one set of four DIP switches for the Ring
Ground setting and one set of eight DIP switches for the D-channel Handler
parameters setting.

The DIP switches are used for setting of default values of certain parameters.
The general purpose switches are read by the firmware which sets the default
values accordingly.

The following parameters are being set by the DIP switches. Factory setups
are shown in bold.

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General Purpose Switches

A per-trunk set of four DIP switches provides the default setting for
operational modes. Switch set S9 is used for Trunk 0. Switch set S15 is used
for Trunk 1. Refer to Table 55’.

Table 55
General purpose switch settings

Switch Description S9/S15 Switch Setting

1 Framing Mode OFF - ESF

ON - SF

2 Yellow Alarm Method OFF - FDL

ON - Digit2

3 Zero Code Suppression OFF - B8ZS

Mode
ON - AMI

4 Unused OFF

Trunk interface switches

Transmission Mode
A per-trunk switch provides selection for T1 transmission. See Table 56.

Table 56
Trunk interface transmission mode switch settings

Description S4/S10 Switch Setting

For future use. OFF

T1 ON

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Line Build Out

A per-trunk set of three switches provides a selection between 0, 7.5 or 15 dB
values. See Table 57.

Table 57
Trunk interface line build out switch settings

Description Switch Setting

S5/S11 S6/S12 S7/S13

0 dB OFF OFF OFF

7.5 dB ON ON OFF

15 dB ON OFF ON

Receiver Impedance
A per trunk set of four DIP switches provides a selection between 75, 100 or
120 Ω values. See Table 58.

Table 58
Trunk interface receiver impedance switch settings

Description S8/S14 Switch Setting

75 Ω OFF OFF ON OFF

100 Ω ON OFF OFF ON

120 Ω OFF OFF OFF ON

Ring ground switches

A set of four DIP switches selects which Ring lines are connected to the
ground. See Table 59.

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Table 59
Ring ground switch settings

Switch Description S2 Switch Setting

1 Trunk 0 Transmit OFF - Ring line is not grounded

ON - Ring line is grounded

2 Trunk 0 Receive OFF - Ring line is not grounded

ON - Ring line is grounded

3 Trunk 1 Transmit OFF - Ring line is not grounded

ON - Ring line is grounded

4 Trunk 1 Receive OFF - Ring line is not grounded

ON - Ring line is grounded

DCH mode and address select switches

A set of eight DIP switches selects between an on-board NTBK51AA
D-channel daughterboard and an external MSDL/DCHI card. In the case of
an on-board NTBK51AA D-channel daughterboard, four of the switches
provide the daughterboard address. See Table 60.

Table 60
DCH mode and address select switch settings

Switch Description S3 Switch Setting

1-4 D-channel daughterboard See Table 61

Address

5-7 For future use. OFF

8 External DCH or Onboard OFF - MSDL or DCHI card

DDCH
ON - Onboard DDCH
daughterboard

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Table 61
NTBK51AA daughterboard address select switch settings

Device
Address1 Switch Setting

02 OFF OFF OFF OFF

1 ON OFF OFF OFF

2 OFF ON OFF OFF

3 ON ON OFF OFF

4 OFF OFF ON OFF

5 ON OFF ON OFF

6 OFF ON ON OFF

7 ON ON ON OFF

8 OFF OFF OFF ON

9 ON OFF OFF ON

10 OFF ON OFF ON

11 ON ON OFF ON

12 OFF OFF ON ON

13 ON OFF ON ON

14 OFF ON ON ON

15 ON ON ON ON

Note 1: The maximum number of DCHI, MSDL, and DDCH devices in the system is 16.

Note 1: The Device Addresses are equivalent to the MSDL DNUM designations.

Note 2: Device address 0 is commonly assigned to the System Monitor.

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Figure 57
Switch functional areas on the NT5D12

NT5D12
Faceplate
Port 0 Port 1
J5 1 2 3 4 1 2 3 4

General Purpose Switches

S9

Receiver Impedance
S8

S7 Line
J6
Build Out
S6
Switches
S5
1 2 3 4

Transmission Mode
S2 S4

1 2 3 4 5 6 7 8

DCH Mode and Address Select

S3

Switches Functions and Areas

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Figure 58
NT5D12 switch default settings

J5 o
1 2 3 4
o
1 2 3 4
n n

J6

1 2 3 4
o
n

1 2 3 4 5 6 7 8
o
n

Switch Default Setting

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Install the NT5D12 DDP

Use Procedure 16 to install the NT5D12 on Large Systems.

CAUTION
The static discharge bracelet located inside the
cabinet must be worn before handling circuit cards.
Failure to wear the bracelet can result in damage to
the circuit cards.

Procedure 16
Install the NT5D12 on Large Systems
1 Determine the cabinet and shelf location where the NT5D12 card is to be
installed. The NT5D12 can be installed in any card slot in the Network
bus, subject to the cautionary note below.

CAUTION
Some installed-based systems can have a Bus
Terminating Unit (BTU) already installed. This can
interfere with a selected NT5D12 card location. In
such cases, the NT5D12 should be installed in an
alternate network bus card slot location.

2 Unpack and inspect circuit cards and cables.

3 If a DDCH is to be installed, refer to “NTBK51 DDCH installation and
removal” on page 119.
4 Set the option switches on the NT5D12 circuit card before installation.
Refer to “NTBK51 DDCH installation and removal” on page 119.
S1 (faceplate switch) must be OFF (DIS) when installing the NT5D12. S1
on the NT5D12 corresponds to the faceplate switch on the QPC414
Network card.
5 Install the NT5D12 circuit card in the assigned shelf and slot.
6 Add related office administration data into the system memory.
7 If required, install the I/O adapters in the I/O panel.

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8 Run and connect the NT5D12 cables.

CAUTION
Clock Controller cables connecting the Clock
Controller and NT5D12 card must NOT be routed
through the center of the cabinet past the power
harness. Instead, route them around the outside of
the equipment shelves.

9 If required, install connecting blocks at the MDF or wall mounted

cross-connect terminal.
10 If required, designate connecting blocks at the MDF or wall mounted
cross-connect terminal.
11 If required, install Network Channel Terminating Equipment (NCTE).
12 Enable faceplate switch S1. This is the “Loop Enable” switch.
The faceplate LEDs should go on for 4 seconds then go off and the OOS,
DIS and ACT LEDs should go on again and stay on.
IF DDCH is installed, the DCH LED should flash 3 times.
13 Run PRI/DTI Verification Test.
14 Run PRI status check.

End of Procedure

Remove the NT5D12 DDP

Use Procedure 17 to remove the NT5D12 from Large Systems.

CAUTION
A static discharge bracelet must be worn before
handling circuit cards. Failure to wear the bracelet
can result in damage to the circuit cards.

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Procedure 17
Remove the NT5D12 DDP
1 Determine the cabinet and shelf location of the NT5D12 card to be
removed.
2 Disable Network Loop using LD 60. The command is DISL “loop number.”
The associated DCHI might have to be disabled first. The faceplate switch
S1 should not be disabled until both PRI loops are disabled first.
3 Remove data from memory, if the NT5D12 card is being completely
removed, not replaced.
4 Remove cross connections at the MDF to wall-mounted cross-connect
terminal.
5 Tag and disconnect cables from card.
6 Rearrange Clock Controller cables if required.

CAUTION
Clock Controller cables connecting the Clock
Controller and NT5D12 card must NOT be routed
through the center of the cabinet past the power
harness. Instead they should be routed around the
outside of the equipment shelves.

7 Determine if the other circuit of a NT5D12 card is in use.DO NOT remove

the card if in use.
8 Remove the NT5D12 card only if both loops are disabled. Switch S1
(faceplate switch) must be in the OFF (DIS) position before the card is
removed.
9 Pack and store the NT5D12 card and circuit card.

End of Procedure

Configure the NT5D12 DDP

After the NT5D12 DDP has been installed, it can be configured using the
same procedures as for the standard QPC720 PRI card.

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Consider the following when configuring the NT5D12 DDP card:

• The system software allows four ports to be defined for the NT6D80
MSDL. The DDCH (NTBK51AA) card has only two ports, 0 and 1;
therefore, ports 2 and 3 must not be defined when using the NTBK51AA.
• Port 0 of the NTBK51AA can only be defined to work with Loop 0 of the
NT5D12 DDP card, and Port 1 of the NTBK51AA can only be defined
to work with Loop 1 of the NT5D12. This relationship must be reflected
when configuring a new DCH in LD 17 (in response to the DCHL
prompt, enter either 0 or 1 when specifying the loop number used by the
DCH).
• You cannot define one of the NT5D12 loops for the NTBK51AA DDCH,
and the other loop for the QPC757 DCHI or the NT6D80 MSDL.

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220

Page 193 of 396

Clock Controller description and

installation

Contents
The section contains information on the following topics:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Need for synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194
Supported Clock Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
Synchronization methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Hierarchical synchronization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Stratum levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Frame slip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 199
Guidelines. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
Modes of operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Small System Clock Controller daughterboard . . . . . . . . . . . . . . . . 208
Installation procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Determine slots and shelves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Set switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209
Start the Clock Controller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Clock Controller commands. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
Install or replace a Clock Controller on a Half Group and
Single Group system. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212
Install or replace a Clock Controller on a Single Group and
Multi Group System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Upgrade to an NTRB53 Clock Controller on a Single Group and
Multi Group System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216

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Introduction
This chapter introduces the NTRB53 Clock Controller, and provides
procedures on how to install this clock controller on Large Systems.

The NTRB53 Clock Controller replaces the QPC471H and QPC775F in new
systems. QPC471H and QPC775F Clock Controllers continue to be
supported.

Note 1: The NTRB53 Clock Controller cannot be combined with a

QPC775 or a QPC471 card in one system

The illustrations used in the description section depict a Small System.

However, the system can also be representative of a Large System.

Description
This section provides an overview on the use of clock controllers. For Large
Systems, the following clock controllers are supported:
• NTRB53
• QPC471
• QPC775

Note: Clock controllers cannot be mixed in one system.

The NTRB53 Clock Controller is available for all markets. The QPC471
Clock Controller is available for U.S. markets. Vintages A through G of the
QPC471 Clock Controller can be used in one system; vintage H of QPC471
Clock Controllers cannot be mixed with clock controllers of other vintages.

The QPC775E Clock Controller card is available for only Canadian and
International markets.

Need for synchronization

Digital trunking requires synchronized clocking so that a shift in one clock
source will result in an equivalent shift of the same size and direction in all
parts of the network.

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When digital signals are being transported over a communication link, the
receiving end must operate at the same frequency (data rate) as the originating
end to prevent loss of information. This is referred to as link synchronization.
If both ends of a communication link are not in synchronization, data bit slips
occur and therefore a loss of data results. In general, accurate timing is very
important, but more importantly synchronized timing is a must for reliable
data transfer.

When only two switches are interconnected, synchronization can be achieved

by operating the two systems in a master/slave mode whereby one system
derives its timing from the other. However, in a network of digital systems,
slips can be better prevented by forcing all digital systems to use a common
reference clock (see Figure 59 on page 198).

Supported Clock Controllers

For Large Systems, the following clock controllers are supported:
• NTRB53
• QPC471
• QPC775

NTRB53 Clock Controller

The NTRB53 Clock Controller is a replacement for the QPC471 and QPC775
Clock Controllers. The NTRB53 clock controller retains existing
functionality.

Software configuration of the clock remains unchanged. A PSDL object

allows field upgrades of the clock’s firmware. Overlay changes allow for
force download and status checking. Support for the IDC command and
hardware inventory are also included.

System Initialization
During system initialization, the system software will verify if the clock
controllers equipped in the system are the downloadable clock controllers
(NTRB53) or not. If the clock controllers are identified as the downloadable
clock controller cards, then both downloadable clock controller cards will be
checked for the software version number they are running with. This is

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compared with the version number of the PSDL file stored in the system
software database.

If there is a mismatch between the two version numbers and the system
database has the higher version number, the card will be put in the PSDL
downloading tree. Once the entry is added in the PSDL tree, the preprocess
step is done. The next step is for the system to initiate the downloading in the
background, using the PSDL tree. As soon as the download complete
message is received from the card, the CPU sends a message to reset the clock
controller card so that it boots with the new software. Once a self-test is
complete the core sends an enable base message to enable the card.

Maintenance Overlays
Downloading can be initiated from LD 60 for the inactive clock controller
card as part of the enabling sequence of the card. A download can be forced
by specifying the optional parameter FDL (Force Download) when enabling
the card. At the prompt, enter:

ENL CC x FDL Enable Clock in side x with the force download option

If the optional parameter is not specified, then downloading is conditional.

This means that the version number of the loadware on the clock controller
card will be checked against the version number stored on the system disk. If
a mismatch is found and the version number in the system software database
is higher, then downloading will be initiated for that card. The entry for the
card is not added to the PSDL tree at this time. Instead, downloading is
initiated on a single card and only that card will be allowed to perform the
force download option.

QPC471 and QPC775 Clock Controllers

Clock Controllers QPC471 and QPC775 will continue to function with:
• CS 1000M HG systems
• CS 1000M SG systems
• CS 1000M MG systems

Note: See “Description” on page 194. for market and application

availability information.

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Synchronization methods
There are two common methods of operation for maintaining timing
coordination between switching systems, Plesiosynchronous and
Mesosynchronous.

Plesiosynchronous operation
In a Plesiosynchronous operation, nodal clocks run independently (free run)
at the same nominal frequency. There are frequency differences between
clocks resulting in frame slips (see “Frame slip” on page 199.) The magnitude
of frame slips are directly proportional to the frequency difference. Slips are
inevitable but can be minimized by using very stable clocks and elastic stores
or buffers. These buffers are capable of absorbing a certain number of data
bits to compensate for slight variances in clock frequencies.

Mesosynchronous operation
In a Mesosynchronous operation, nodal clocks are continuously and
automatically locked to an external reference clock. With this method, frame
slips can be eliminated if elastic stores are large enough to compensate for
transmission variances. Mesosynchronous operation is virtually slip free.

Whenever possible the system uses the Mesosynchronous mode of operation

by using the clock controller circuit cards to lock onto an external reference
source (such as the Central Office, another PBX, and so on). This statement
is true unless the system is used as a Master in an independent/private
network (no digital links to a higher Node Category).

In an isolated private network, the clock controller can operate in free run
mode and act as a master clock to be tracked by other PBX systems in the
private network.

Hierarchical synchronization
Figure 59 on page 198 provides a general view of the Digital Network Clock
Synchronization including the four stratum level Node Categories. Stratum 1
being the most accurate and Stratum 4 being the least accurate. System
clocking meets Node Category E Stratum 4 requirements. Also shown are
ways of providing a Secondary Clock Source while preventing timing loops.

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Figure 59
Hierarchical Synchronization

Primary
Reference Source

Stratum 1 nodes (clock derived directly from or controlled by Cesium clock)

Stratum 2 nodes (i.e. Toll Offices)
Stratum 3 nodes (i.e. Digital Central or End offices)
Stratum 4 nodes (i.e. Digital PBXs & Channel Banks)
Digital Transmission Facility
Primary Reference Source
Secondary Reference Source
553-7560.EPS

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Stratum levels
In a digital network, nodes are synchronized using a priority master/slave
method. Digital nodes are ranked in Stratum levels 1 to 5. Each node is
synchronized to the highest ranking node in its neighborhood with which it
has a direct link. Refer to Table 62.

Table 62
Node categories and stratum levels
Stratum 2 Stratum 3 Stratum 4
-8 -6
Accuracy +/- 1.6 * 10 Hz +/- 4.6 * 10 Hz +/- 3.2 * 10-5 Hz

1 * 10-10 per day <= 255 frame slips in Not Required

Holdover 1st 24 hours
Hardware Required Required (Note 1) Not Required
Duplication
MTIE <= 1 usec Phase MTIE <= 1 usec Phase No Requirement
MTIE During Change Slope: <= 81 Change Slope: <= 81 (Note 2)
Rearrangement ns in any 1.326 msec ns in any 1.326 msec
Pull-in Range +/- 1.6 * 10-8 Hz +/- 4.6 * 10-6 Hz +/- 3.2 * 10-5 Hz

Dedicated Timing Required Required Not required

Required

Note 1: Non-duplicated clock hardware that meets all other stratum 3

requirements is referred to as stratum 3ND.

Note 2: Stratum 4 clock hardware that meets MTIE requirements during

rearrangements is referred to as 4E.

Frame slip
Digital signals must have accurate clock synchronization for data to be
interleaved into or extracted from the appropriate timeslot during
multiplexing and demultiplexing operations. A Frame Slip is defined (for 2
Mbyte links) as the repetition of, or deletion of the 256 data bits of a CEPT
frame due to a sufficiently large discrepancy in the read and write rates at the
buffer (clocks are not operating at exactly the same speed).

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When data bits are written into (added to) a buffer at a slightly higher rate
than that at which they are being read (emptied), sooner or later the buffer
overflows This is a slip-frame deletion.

In the opposite situation, when data bits are written (added) into a buffer at
slightly lower rate than that at which they are being read (emptied), eventually
the buffer runs dry or underflows. This is also a slip-frame repetition.

A 1.5 Mbyte PRI contains a buffer large enough to hold about 2 full DS-1
frames (193 x 2 = 386). A 2 Mbyte PRI contains a buffer large enough to
contain 2 full frames (256 x 2 = 512 bits). The buffer is normally kept half full
(1 frame).

Slippage has impact on the data being transferred, as is shown in Table 63.
All of the degradations shown in the table can be controlled or avoided with
proper clock synchronization.

Table 63
Performance impact of one slip on service type
Service Potential Impact
Encrypted Text Encryption key must be resent.
Video Freeze frame for several seconds. Loud pop on
audio.
Digital Data Deletion or repetition of data. Possible misframe.
Facsimile Deletion of 4 to 8 scan lines. Dropped call.
Voice Band Data Transmission Errors for 0.01 to 2 s. Dropped
call.
Voice Possible click.

Guidelines
Some key points to keep in mind when designing Network Synchronization:
• Where possible, the Master Clock Source should always be from a Node
Category/Stratum with higher clock accuracy, that is, a PBX connected
to the Central Office (CO.) The CO is the Master and the PBX is the
Slave.

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• The source should not be in free-run itself (providing its own clock)
unless it is operating in a fully independent network where the source
acts as a Master (see “Plesiosynchronous operation” on page 197.)
• When connecting two PBXs together (no CO connections), the most
reliable PBX should be the Master. Reliability here refers to Dual
CPU/Dual Clock, battery back-up or stratum level of the clock controller.
• Avoid timing loops. A timing loop occurs when a clock using as its
reference frequency a signal that it itself traceable to the output of that
clock. The formation of such a closed timing loop leads to frequency
instability and is not permitted. Timing loops are sometimes unavoidable
on the secondary clock reference source.
• Ensure all CO/PBX links used as clock references have a traceable path
back to the same stratum 1 clock source.

While it is beyond the scope of this discussion to provide detailed Network

Synchronization, the following examples illustrate some of the basic concepts
to achieve stable clocking.

Figure 60
Example 1, Isolated Private Network

Small System Small System

LD 60 LD 60
TRCK FRUN loop X loop X TRCK PCK

LD 73: LD 73:
PREF <cr> PREF loop X
SREF <cr> SREF <cr>
Master clock Slave
Master Clock source: Clocking off Master:
Non-tracking (Free run) Tracking on Primary
loop X
553-AAA0083

In this example, there is no digital connection to the Central Office.

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Figure 61
Example 2, Isolated Private Network with Secondary Reference Clock

Small System Small System

LD 60 LD 60
TRCK FRUN loop X loop X TRCK PCK

LD 73: loop Y loop Y LD 73:

PREF <cr> PREF loop X
SREF <cr> SREF loop Y
Master clock Slave
Master Clock source: Clocking off Master:
Non-tracking (Free run) Tracking on Primary
loop X and loop Y used
as a secondary clock
source
553-AAA0066

In this example, there is no digital connection to the Central Office. For tie
lines between PBXs facilitated by a central office, clocking is derived from
the PBX, not the CO. When a second Digital loop is available, it can be used
as a Secondary Clock source in case the Primary Source fails.

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Figure 62
Example 3, Clocking Hierarchy referenced to a Public Network Master
Clock

Small System Small System

LD 60 LD 60
TRCK PCK TRCK PCK
Slave Slave
LD 73: LD 73:
PREF loop W PREF loop Z
SREF <cr> SREF <cr>
loop W loop Z
Small System
Clocking off Master: Clocking off Master:
Tracking on Primary Tracking on Primary
loop W, no secondary LD 60 loop Z, no secondary
source. TRCK PCK source.
loop A Central Master
LD 73:
PREF loop A loop B Office Clock
SREF loop B
Small System Small System
loop Y loop X
LD 60 LD 60
TRCK PCK TRCK PCK
Slave Slave
LD 73: LD 73:
PREF loop Y PREF loop X
SREF <cr> SREF <cr>

Clocking off Master: Clocking off Master:

Tracking on Primary Tracking on Primary
loop Y, no secondary loop X, no secondary
source. source.
553-AAA0067

This is an example of a “STAR” arrangement— one Hub PBX is linked to the

Central Office and all other PBXs are connected as slaves. When a second
Digital loop from the system which forms the hub of this network becomes
available, it can be used as a Secondary Clock Source in case the Primary
Source fails.

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Figure 63
Example 4, Alternate Clocking from the same CO

Master Clock
Master clock source:
Non-tracking (Free-run)

LD 60
TRCK FRUN
Small System or
Central Office LD 73:
PREF <cr>
SREF <cr>

Small System loop Y loop X Small System

LD 60 LD 60
TRCK PCK TRCK PCK
Slave Slave
loop Z
LD 73: LD 73:
PREF loop Y PREF loop X
SREF loop Z SREF <cr>

Clocking off Master: Clocking off Master:

Tracking on Primary Tracking on Primary
loop Y and loop Z loop X and leave the
used as a secondary Secondary Reference
clock source. blank.
553-AAA0068

In this case, a digital connection to the Central Office can exist (i.e. Loops X
and Y). When a second Digital loop from the CO or Master M-1 becomes
available, it can be used as a Secondary Clock Source in case the Primary
Source fails.

To avoid timing loops, in example 4-4 the most reliable slave system should
not have a Secondary Clock Source (SREF= <cr>). In this example, this is
illustrated by the node which supports loops X and Z.

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Figure 64
Example 5, digital connection to the CO

Master Clock Master Clock Master Clock

Central Central Central
Office Office Office

loop W loop X loop Y

Small System Small System Small System

LD 60 LD 60 LD 60
TRCK PCK TRCK PCK TRCK PCK
Slave Slave Slave
LD 73: LD 73: LD 73:
PREF loop W loop PREF loop X loop PREF loop Y
SREF loop A A SREF loop A B SREF loop B

Clocking off Master: Clocking off Master: Clocking off Master:

Tracking on Primary Tracking on Primary Tracking on Primary
loop W and loop A loop X and loop A loop Y and loop B
used as a secondary used as a secondary used as a secondary
clock source. clock source. clock source.
553-AAA0069

In this example, digital connections to the Central Office do exist. When a

second Digital loop from the CO becomes available, it can be used as a
Secondary Clock Source in case the Primary Source fails.

Slaves can track on each other as a secondary source since the chances of both
links to the Central Offices going down at the same time are minimal.

All Central Offices must have a path back to the same stratum 1 source.

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Figure 65
Example 6, Complex Isolated Private Network

Clocking off Master:

Tracking on Primary loop Y
and loop W used as a Master clock
Non-tracking
secondary clock source (Free-run)
Small System Small System

LD 60 LD 60
TRCK FRUN loop X TRCK FRUN

LD 73: LD 73:
PREF loop X loop Y PREF <cr>
SREF loop W SREF <cr>

loop Y
Small System Small System

LD 60 LD 60
TRCK PCK TRCK PCK
loop Z
LD 73: LD 73:
PREF <cr> PREF loop X
SREF <cr> SREF loop Y

Slave Slave
Tracking on Primary Clocking off Master:
loop Z, no secondary Tracking on Primary loop Y,
clock source no secondaryclock source
553-AAA0070

Digital connections to the Central Office do not exist in this example. If it

does, the PBX connected to it will track off the CO and will in turn be used
as a clock source to other nodes.

When a second Digital loop from the Master system becomes available, it can
be used as a Secondary Clock Source in case the Primary Source fails.

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Figure 66
Example 7, Network Clocking with MUX

Clocking off Master:

Tracking on Primary loop Y
and loop X used as a
secondary clock source.
Small System

LD 60
Master clock TRCK PCK
Slave
Central LD 73:
Office
loop X MUX PREF loop Y
SREF loop X

Master clock loop Y

MUX

Central loop Z
Office

MUX
Small System

LD 60
Clocking off Master:
TRCK PCK
Tracking on Primary
loop Z, no secondary Slave
LD 73:
clock source PREF loop Z
SREF <cr>

553-AAA0071

In this example, the direct connection to the CO (without a MUX) should be

used as a primary clock reference because this is where the least amount of
hardware is involved. The MUX must pass the clock and not generate its own
clock; in other words, it must be a slave (not Free Run). Synchronized
clocking is required.

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Modes of operation
There are two modes of operation, tracking mode and free run (non-tracking)
mode.

Tracking mode
In tracking mode, the Primary Rate Interface (PRI) or Digital Trunk
Interface (DTI) loop supplies an external clock reference to the on-board
clock controller. Two PRI or DTI packs can operate in tracking mode, with
one defined as the primary reference source for clock synchronization, the
other defined as a secondary reference source. The secondary reference acts
as a back-up to the primary reference.

Free run (non-tracking) mode

The clock synchronization for a PRI loop can operate in free-run mode if:
• the loop is not defined as the primary or secondary clock reference
• the primary and secondary references are disabled
• the primary and secondary references are in a local alarm state

Small System Clock Controller daughterboard

The Small System and CS 1000S supports a single on-board clock controller
daughterboard, the NTAK20, located on either:
• the NTRB21 1.5 Mbyte DTI/PRI card
• the NTAK09 1.5 DTI/PRI card
• the NTAK10 2 Mbyte DTI card
• the NTAK79 2 Mbyte PRI card
• the NTBK50 2 Mbyte PRI card

The clock controller circuitry synchronizes to an external reference clock and

generates and distributes the clock to the system. This enables the system to
function either as a slave to an external clock or as a clocking master.

Note: When configuring ISL over analog trunks, clock controllers are
not required.

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Installation procedures
This section provides procedures on how to install a clock controller on Large
Systems.

CAUTION
Do not deviate from the procedures described in this
section. Call processing can stop if procedural steps
are not followed properly.

Determine slots and shelves

Table 64 shows the systems, the shelves and available slots.

Table 64
Clock Controller shelves and slots

System Shelf Slot(s)

Half Group, NT6D39 CPU/NET 9

Single Group

Multi Group NTDA35 Network Module 13

Set switches
Before installing a clock controller, set the switches as shown in Table 65,
Table 66, and Table 67. Table 65 on page 210 displays the settings for
different vintages of the QPC471. Table 66 on page 210 shows the settings
for the QPC775. Table 67 on page 211 shows settings for the NTRB53.

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Table 65
Clock Controller switch settings for QPC471 vintage H

SW1 SW2 SW4

System 1 2 3 4 1 2 3 4 1 2 3 4

Half Group, Single Group on on on on off off off off off on * *

Option 81 off off off off off off off off off on * *

Multi Group (with the on off off off off off off off ** on * *
exception of Option 81)

Multi Group with Fiber on off off off off off off off ** on * *
Network

*Cable length between the J3

faceplate connectors:

0–4.3 m (0–14 ft) off off

4.6–6.1 m (15–20 ft) off on

6.4–10.1 m (21–33 ft) on off

10.4–15.2 m (34–50 ft) on on

* If there is only one clock controller card in the system, set to OFF. If there are two clock controller cards,
determine the total cable length between the J3 connectors (no single cable can exceed 25 ft.) and set
these two switch positions for this cable length, as shown above. The maximum total (combined) length
is 50 ft. Set the switches on both cards to the same settings.
** Set to ON for clock controller 0. Set to OFF for clock controller 1.
Note: FNF based-systems the total clock path length is equal to the length of the NTRC49
cable used to connect between the two clock controller cards.

Table 66
Clock Controller switch settings for QPC775

System SW2 SW3 SW4

Half Group, Single Group ON OFF ON

Multi Group OFF OFF ON

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Table 67
Clock Controller switch settings for NTRB53

Multigroup/ Machine Faceplate Side Number Machine

Single group Type # 1 Cable Length Type #2

(CC to CC)

1 2 3 4 5 6

Multigroup Off Off 0-14 ft Side 0 = On 81 = Off

= Off 61, 51C, 61C Side 1 = Off 51, 51C

Single group 71, 81, 81C = 61, 61C, 81C

= On On
= On

Off On 15-20 ft

On Off 21-33 ft

On On 34-50 ft

Note: Switches 7 and 8 are not used.

Start the Clock Controller

The clock controller, when first enabled, is in free run mode. It stays in this
mode for several minutes before being switched to tracking mode. Manual
mode setting is possible using LD 60.

All clock controllers begin tracking within approximately 15 minutes.

Clock Controller commands

During the installation procedure you will use some of the clock controller
commands available in LD 39 and LD 60. Refer to Software Input/Output
Guides (553-3001-511).

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LD 39 commands with the NTRB53 Clock Controller

Command Description

DIS SCG x Disable SCG card x (0 or 1).

Not applicable for NTRB53 Clock Controller. Use LD 60
instead.

ENL SCG x Enable SCG x (0 or 1).

Not applicable for NTRB53 Clock Controller. Use LD 60
instead.

SCLK Switch clock to other SCG.

Functions with NTRB53 Clock Controller

STAT SCG x Print status of SCG x (0 or 1).

Prints normal status of NTRB53 (not full status)

Install or replace a Clock Controller on a Half Group

and Single Group system
Procedure 18 outlines the steps to install a clock controller on Half Group and
Single Group systems.

Procedure 18
Install a clock controller for Half Group and Single Group Systems.
1 Unpack and inspect the circuit card.
2 Determine the cabinet and shelf location. Refer to Table 64 on page 209.
3 Set the clock controller switch. Refer to Table 65 on page 210, Table 66
on page 210, or Table 67 on page 211.
4 Set the ENL/DIS toggle switch to DIS (disable).

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 Clock Controller description and installation Page 213 of 396

5 Replacing a clock controller, do the following:

— Perform a status check on the clock with the SSCK command in
LD 60. The new controller should have the same status.

Note: ERR20 messages can be generated. These can usually be

ignored. However, excessive clock switching should be avoided,
especially when counters are near the maintenance or out-of-service
thresholds. Excessive switching could generate threshold-exceeded
messages or cause the PRI to be automatically disabled. Check the
counters in LD 60. If necessary, reset the counters using the RCNT
command.
a. Set the old card’s faceplate ENL/DIS switch to DIS.
b. Disconnect the cables from the old clock controller card and remove
the card from the shelf.

6 Adjust the 3PE switches to recognize the clock controller card.

7 Set faceplate ENL/DIS switch to DIS.
8 Install the clock controller in the selected slot.
9 Run and connect cables
a. Connect the primary reference to J2.
b. If available, connect the secondary reference to J1.
c. Connect the cable between the two clocks to J3 on each controller
card.

10 Set the faceplate ENL/DIS switch to ENL.

Note: Verify that the faceplate LED flashes three times to ensure the
clock controller self test passed.
11 Enable the clock controller by entering ENL CC x in LD 60.
12 Set the error detection thresholds and clock synchronization controls in
LD 73. (Optional with card replacement; required with new installation.)
13 Track on a primary or secondary reference clock, use LD 60. Use the
following command:
TRCK PCK (for primary)
SCLK (for secondary)
FRUN (for free-run)

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14 Issue the status check command, SSCK.

Note: In order for the clock enhancement feature in the clock controller
(NTRB53) to be fully functional, the user must issue a manual INI to
activate the clock enhancement feature.

End of Procedure

Install or replace a Clock Controller on a Single Group

and Multi Group System
Procedure 19 outlines the steps to install a clock controller on Single Group
and Multi Group systems.

Procedure 19
Install a Clock Controller on a Single Group and Multi Group System
1 Unpack and inspect the circuit card.
2 Determine the cabinet and shelf location. Refer to Table 64 on page 209.
3 Set the clock controller switch. Refer to Table 65, Table 66, or on
page 210.
4 Set the ENL/DIS toggle switch to DIS (disable).
5 If replacing a clock controller, do the following:
• Perform a status check on the clock with the SSCK command in
LD 60. The new controller should have the same status.
• Use LD 135 to STAT the CPU and switch if necessary
• Disable the old card using LD 60.
Note 1: Do not disable an active clock or a clock associated with an
active CPU.
Note 2: ERR20 messages can be generated. These can usually be
ignored. However, excessive clock switching should be avoided,
especially when counters are near the maintenance or out-of-service
thresholds. Excessive switching could generate threshold-exceeded
messages or cause the PRI to be automatically disabled. Check the
counters in LD 60. If necessary, reset the counters using the RCNT
command.

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 Clock Controller description and installation Page 215 of 396

a. Set the old card’s faceplate ENL/DIS switch to DIS.

b. Disconnect the cables from the old clock controller card and remove
it from the shelf.

6 Install the new clock controller in the selected slot.

7 Run and connect the cables
a. Connect the primary reference to J2.
b. Connect the secondary reference to J, if available.
c. Connect the cable from J3 on each controller card to the junctor
group connector.

8 Set the faceplate ENL/DIS switch to ENL.

9 Execute the ENL CC X command in LD 60. The faceplate LED should go
to the OFF state.
10 Set the error detection thresholds and clock synchronization controls in
LD 73. (Optional if replacing card; required with new installation.)
11 Track on a primary or secondary reference clock, use LD 60. The
command follows:
TRCK PCK (for primary)
SCLK (for secondary)
FRUN (for free-run)

12 Issue the status check command, SSCK.

13 (Optional) Wait two minutes before activating the newly installed clock
controller with the LD 60 SWCK command.
Note: This allows a smooth transition of the clock controller upgrade.
14 Repeat for the second clock controller, if necessary.

End of Procedure

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Upgrade to an NTRB53 Clock Controller on a

Single Group and Multi Group System
Follow these procedures to replace the existing clock controller with the
NTRB53 Clock Controller on Large Systems.

Note: The NTRB53 Clock Controller cannot be combined with a

QPC775 or a QPC471 card in one system.

Procedure 20
Remove old equipment
1 Ensure the clock controller card being removed for dual core systems is
on the inactive core. If you need to switch cores go to LD 135 and enter:
LD 135
SCPU Switch cores
**** Exit the overlay

2 Disable the QPC775 or QPC471 Clock Controller card. At the prompt,

enter:
LD 60 Load the program
SSCK x Get status of system clock where x = 0 or 1

Switch clocks if the clock is active at the prompt, enter:

SWCK Switch system clock from active to standby
SSCK x Get status of system clock where x = 0 or 1

Ensure the other clock controller is active and in the free run mode. At
the prompt, enter:
SSCK x Get status of system clock where x = 0 or 1
TRCK FRUN Set clock controller tracking to free run

3 Disable the clock controller card you are removing. At the prompt, enter:
DIS CC x Disable system clock controller where x = 0 or 1

4 Set the ENL/DIS switch to DIS on the card you are removing.
5 Tag and disconnect the cables to the card you are removing.

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6 Unhook the locking devices on the card and pull it out of the card cage.

End of Procedure

Follow these procedures to install new equipment with Clock Controller on

Large Systems.

Procedure 21
Installing new equipment
1 Set the ENB/DIS switch to DIS on the replacement card.
2 Set the option switches on the replacement card (NTRB53). Refer to
Table 67 on page 211.
3 Insert the replacement card into the vacated slot and hook the locking
devices.
4 Connect the reference cables (J1 and J2) to the replacement card.

CAUTION
Clock-to-Clock cable J3 should never be connected
between the old clock (QPC471 or QPC775) and the
new clock (NTRB53).

5 Set the ENB/DIS switch to ENB on the replacement card.

6 Software enable the card. At the prompt, enter:
LD 60
ENL CC x Enable clock controller card, where x = 0 or 1

7 Verify that the card is active. At the prompt, enter:

SSCK x Get status of system clock where x = 0 or 1
**** Exit the overlay

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8 Switch to the core with the new clock. At the prompt, enter:
LD 135
SCPU Switch CPU

Note: Wait two minutes before proceeding to the next step.

CAUTION
The following procedure to faceplate disable the
active clock controller could impact service.

9 Disable the faceplate of the active clock controller to force the newly
installed clock controller to activate.
10 Disconnect the Clock-to-Clock faceplate cable to J3 of the new clock
controller card in the active CPU side.

CAUTION
Active calls will experience noise over local and
trunk calls

11 Verify that the clock controller is active. At the prompt, enter:

LD 60
SSCK Get status of the new system clock, where x = 0 or 1
TRCK PCK Track primary clock, where x = 0 or 1
RCNT Resets all alarm counters of all digital cards
**** Exit the overlay

Note: Replacing the clock controller will generate errors on the network
equipment. It is recommended that all counters be reset.
12 Replace the remaining QPC775 or QPC471 clock controller card, tag and
disconnect the cables to the card you are removing.
13 Unhook the locking devices on the card and pull it out of the card cage.
14 Set the ENB/DIS switch to DIS on the replacement card.
15 Set the option switches on the replacement card (NTRB53). Refer to
Table 67 on page 211.

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16 Insert the replacement card into the selected slot and hook the locking
devices.
17 Connect the reference cables (J1 and J2) and the clock-to-clock cable
(J3) to the replacement card.
18 Set the ENB/DIS switch to ENB on the replacement card.
19 Disable the software and enable the card. At the prompt, enter:
LD 60
DID CC x Disable clock controller card, where x=0 or 1
ENL CC x Enable clock controller card, where x=0 or 1

20 Verify that the card is active. At the prompt, enter:

SSCK x Get status of system clock, where x=0 or 1
**** Exit the overlay

Note: Wait two minutes before proceeding to next step.

21 Activate the new card and verify that it is active. At the prompt enter:
LD60
SWCK Switch system clock from active to standby
SSCK x Get status of system clock, where x = 0 or 1

TRCK PCK Track primary clock, where x = 0 or 1

RCNT Reset alarm counters of all digital cards
**** Exit the overlay

22 Set the clock source to the status it was in before the replacement
procedure.
23 Verify clock switch-over and tracking. At the prompt, enter:

SWCK Switch system clock from active to standby

SSCK x Get status of system clock, where x = 0 or 1
**** Exit the overlay

End of Procedure

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236

Page 221 of 396

ISL installation

Contents
The section contains information on the following topics:
ISL configurations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221
DCHI switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
MSDL switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 224
Shared mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Dedicated mode using leased line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226
Dedicated mode using dial-up modem . . . . . . . . . . . . . . . . . . . . . . . . . 227
Install a modem for ISL applications . . . . . . . . . . . . . . . . . . . . . . . . 227
Dedicated mode using PRI/DTI trunks . . . . . . . . . . . . . . . . . . . . . . 230
QMT11 switch settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232
QMT8 switch settings. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
QMT21C switch settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
ISL installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234
Install ISL in dedicated mode (digital and analog) . . . . . . . . . . . . . 234
Install ISL in shared mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

ISL configurations
The ISDN Signaling Link (ISL) is used on PRI/DTI connections. The ISL
feature operates in two modes, shared and dedicated.

Shared mode
The DCHI supports ISDN PRI signaling for both PRI and ISL trunks.

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Dedicated mode
In this mode, the DCHI supports ISL trunks using ISDN PRI signaling. The
D-channel communicates with the far end using a dedicated leased line,
dial-up modem, or DTI trunk.

DCHI switch settings

For ISL functions, use the following switch settings for the J2 port:
• RS-232 for 19.2 Kbps and below
• HS (RS-422) for speeds above 19.2 Kbps
• External clock (in LD 17) provided by modem, ADM, or ASIM,
otherwise DCHI will be running at 64 Kbps
• DTE device configuration

Figure 67 on page 223 shows the ISL high-speed programming jumper

settings for the NT6D11AB, NT6D11AE DCHI, and Figure 68 on page 224
shows the ISL low-speed programming jumper settings for the NT6D11AB,
NT6D11AE/AF DCHI.

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 ISL installation Page 223 of 396

Figure 67
NT6D11AB, NT6D11AD DCHI with ISL high-speed programming jumper settings

DCE RS-232
DTE RS-422
PORT 0
DCE RS-232
DTE RS-422

DCE RS-232
DTE RS-422
PORT 1
DCE RS-232
DTE RS-422

553-7350

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Figure 68
NT6D11AB, NT6D11AD DCHI with ISL low-speed programming jumper settings

DCE RS-232
DTE RS-422
PORT 0
DCE RS-232
DTE RS-422

DCE RS-232
DTE RS-422
PORT 1
DCE RS-232
DTE RS-422

553-7351

MSDL switch settings

For ISL functions, use the following switch settings.
• DTE for high speed programming;
• RS-232 for 19.2 Kbps and below;
• External clock (in LD17) provided by modem, ADM, or ASIM, HSDM:
otherwise, DCH runs at 64 Kbps. Refer to Figure 69 on page 225.

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 ISL installation Page 225 of 396

Figure 69
MSDL/ISL settings

Card Address Select Switches

Ones Tens
23 23

456

456
901

901
78 78

S9 S10
LED
DCE DTE
O1 2 3 4 5 6 7 8
N
O 1 2 3 4 5 6 7 8 9 10
N
422
232
S4 S8
Port 0

DCE DTE
O1 2 3 4 5 6 7 8 O 1 2 3 4 5 6 7 8 9 10 422
Port 1 N N
232
S3 S7

Port 2 DCE DTE

O1 2 3 4 5 6 7 8
N
O 1 2 3 4 5 6 7 8 9 10
N
422
232
S2 S6
Port 3

DCE DTE
O1 2 3 4 5 6 7 8 O 1 2 3 4 5 6 7 8 9 10 422
Monitor N N
232
Port S1 S5

553-5431

Shared mode
In shared mode, the D-channel is provided by the DCHI or MSDL card and
PRI. The hardware configuration is basically the same as the ISDN PRI
D-channel. See Figure 70 on page 226.

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Shared mode is established through service change in LD17, prompt USR,

with the response SHA.

In the shared mode, the DCH can share signaling for no more than 382 (T1)
or 480 (E1) trunks, including digital and analog.

Figure 70
ISL in shared mode

Originating site Terminating site

Large System autodial autodial Large System

Modem Modem
QCAD42A QCAD42A
DCHI
IRP DCHI
PRI
or MSDL or NTND27 or NTND27 or MSDL

500 set Twisted pair Twisted pair 500 set

lineIRcard
P PRI
line card

ISL D-channel
TIE
IRP TIE
PRI

must be configured as
non-ISL trunks
553-AAA0062

Dedicated mode using leased line

In this configuration, the D-channel connects the DCHI or MSDL to a modem
which communicates with a far-end modem over a dedicated leased line. See
Figure 71 on page 227. A 2400 baud D-channel can support signaling for
approximately 382 (T1) or 480 (E1) trunks without non-call associated
messages.

Both modems should be set in the synchronous mode.

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Figure 71
ISL dedicated mode, using leased line

Large System Large System

QCAD42A Modem ISL D-channel Modem NTND27

DCHI
IRP MSDL
PRI
Leased line

553-AAA0063

Dedicated mode using dial-up modem

In this configuration, the DCHI or MSDL is connected to a modem which is
connected to a 500 set line card. See Figure 73 on page 230. The call is
connected to the far end through the analog (500/2500 type set)-to-TIE trunk
path.

To set up the D-channel, program the modem at one end in the auto-dial
mode, so it automatically initiates a call to the other end at power up. The
auto-dial DN must be coordinated with personnel at the far end switch.

Install a modem for ISL applications

The modem software and hardware must be installed sequentially. The
modem software must be defined before the hardware connection between
the modem and the system can be made. Within the software installation,
either the auto-dial or the auto-answer software can be set up first. Figure 72
on page 228 shows the hardware configuration between two PBXs and their
corresponding modems.

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Figure 72
ISL dedicated mode: using dial-up Hayes Smartmodem 2400

Originator Terminator
Large System autodial autoanswer Large System
Modem Modem
QCAD42 QCAD42
DCHI
IRP DCHI
PRI

500IRset Twisted pair Twisted pair 500 set

P PRI
card card

ISL D-channel
TIE
IRP TIE
PRI

553-AAA0065

Examples of parameters used for actual auto-answer and auto-dial sites are
shown in the following tables (note that the Hayes Smartmodem has been
used.) Table 68 on page 228 shows the active and stored profiles of the
auto-dial site (or the originating modem). Table 69 on page 229 shows the
active and stored profiles of the auto-answer site (or the terminating modem).
The Hayes Smartmodem User Guide contains explanations of the parameters
used in Table 68 and Table 69.

After the software parameters have been set up, the JP1 jumpers behind the
front faceplate of the Hayes Smartmodem must be dumb strapped on both
modems. Next, see the Hayes Smartmodem Getting Started Guide to set up
the hardware between the system and the modem.

Table 68
Active and stored profiles of the autodial or originating modem

Active profile:

B1 E0 L2 M1 Q1 V1 X4 Y0 &C1 &D0 &G0 &J0 &L0 &P0 &Q2 &R0 &S0 &X0 &Y0
S00:000 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:030
S08:002 S09:006 S10:014 S12:050 S14:ACH S16:00H S18:000 S21:20H
S22:76H S23:15H S25:005 S26:001 S27:42H

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Table 68
Active and stored profiles of the autodial or originating modem

Stored profile 0:

B1 E0 L2 M1 Q1 V1 X4 Y0 &C1 &D0 &G0 &J0 &L0 &P0 &Q2 &R0 &S0 &X0
S00:000 S14:ACH S18:000 S21:20H S22:76H S23:17H S25:005 S26:001
S27:42H

Stored profile 1:

B1 E1 L2 M1 Q0 V1 X4 Y0 &C0 &D0 &G0 &J0 &L0 &P0 &Q0 &R0 &S0 &X0
S00:00 S14:AAH S18:000 S21:00H S22:76H S23:17H S25:005 S26:001
S27:40H

Telephone numbers:

&Z0=ATDT7414011
&Z1=
&Z2=
&Z3=

Table 69
Active and stored profiles of the auto answer or terminating modem

Active profile:

B1 E0 L2 M1 Q1 V1 X4 Y0 &C1 &D2 &G0 &J0 &L0 &P0 &Q1 &R0 &S1 &X2 &Y0
S00:001 S01:000 S02:043 S03:013 S04:010 S05:008 S06:002 S07:030
S08:002 S09:006 S10:014 S12:050 S14:ACH S16:00H S18:000 S21:70H
S22:76H S23:15H S25:005 S26:001 S27:61H

Stored profile 0:

B1 E0 L2 M1 Q1 V1 X4 Y0 &C1 &D2 &G0 &J0 &L0 &P0 &Q1 &R0 &S1 &X2
S00:001 S14:ACH S18:000 S21:70H S22:76H S23:17H S25:005 S26:001
S27:61H

Stored profile 1:

B1 E1 L2 M1 Q0 V1 X4 Y0 &C0 &D0 &G0 &J0 &L0 &P0 &Q0 &R0 &S0 &X0
S00:000 S14:AAH S18:000 S21:00H S22:76H S23:17H S25:005 S26:001
S27:40H

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Table 69
Active and stored profiles of the auto answer or terminating modem

Telephone numbers:

&Z0=
&Z1=
&Z2=
&Z3=

Figure 73
ISL dedicated mode, using dial-up Hayes Smartmodem 2400

Originating site Terminating site

Large System autodial autodial Large System

Modem Modem
QCAD42A QCAD42A
DCHI
IRP DCHI
PRI
or MSDL or NTND27 or NTND27 or MSDL

500 set Twisted pair Twisted pair 500 set

lineIRcard
P PRI
line card

ISL D-channel
TIE
IRP TIE
PRI

must be configured as
non-ISL trunks
553-AAA0062

Dedicated mode using PRI/DTI trunks

In this configuration, the DCHI or MSDL is connected to a High Speed Data
Module (HSDM) or Asynchronous/Synchronous Interface Module (ASIM).
See Figure 74 on page 232. The HSDM or ASIM is connected to a Data Line

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 ISL installation Page 231 of 396

Card (DLC). The call is then connected to the far end through the DLC to DTI
trunk path.

To establish the D-channel in this configuration, set up the HSDM or ASIM

at one end in hot line mode. The hot line DN must be coordinated with
personnel at the far end, then programmed in LD11. The preprogrammed hot
line DN is dialed by the system. If the call cannot be established, the system
continues to dial the hot line number continuously until the call is connected.

Set the HSDM or ASIM must be in synchronous mode. A data rate of 9.6
Kbps is recommended because it provides internal error detection and
correction. The following data rates are also supported: 1.2 Kbps, 2.4 Kbps,
3.6 Kbps, 4.8 Kbps, 7.2 Kbps, 14.4 Kbps, 19.2 Kbps, 38.4 Kbps, and 56 Kbps
for ASIM. The High Speed Data Module (HSDM) supports 64 Kbps.

Note 1: This configuration is the least reliable due to the lockup

problems inherent in Smart Modems from power splices and noisy lines.
To increase the reliability on this configuration, a constant power source
can be used when powering the modems. Also ensure that the TIE lines
meet data grade specifications.

Note 2: Nortel takes no responsibility for ISL D-channel outages due to

modem lockup.

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Figure 74
ISL dedicated mode: using PRI/DTI trunk

Large System Large System

HSDM HSDM
or or
ASM ASM
QCAD42A NTND27
DCHI
IRP MSDL
PRI

Data Twisted pair Twisted pair Data

lineIRcard
P PRI
line card

DTI ISL D-channel

IRP or DTI
PR or
I
PRI PRI

553-AAA0064

QMT11 switch settings

If using the QMT11 ASIM, set the DIP switches, located on top of the unit
under the flip-up, as follows:
• Hotline, On; See Note 1.
• Forced DTR, On; See Note 2.
• FDX (full duplex), On
• SYNC, On
• INTernal CLK, On
• Modem/Network, Modem
• Auto Answer, On
• Loopback, Off

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Note 1: Set only one side of the interface to originate the hot line.

Note 2: Forced Data Terminal Ready (DTR) automatically reinitiates a

dropped hot line call.

QMT8 switch settings

If the QMT8 Asynchronous Data Module (ADM) is used, set the switches as
follows:

Switch 1: Switch 3: Switch 4:

1 not used 1 on
set to zeros (no VFDN)
2 not used 2 on (hot line*)

3 FDX (full duplex) 3 off (DTR-data

terminal
4 modem
ready-required)
5 internal clock
4 on (synchronous)
6 no echo U5 and U7 must be
jumpered
7 auto answer
* Only one side of the
8 off (no loopback)
interface should be set to
originate the hot line.

QMT21C switch settings

If using the QMT21 HSDM, set the dip switches, located on top of the unit
under the flip-up, as follows.
• Hotline, On; See Note 1.
• Forced DTR, On; See Note 2.
• FDX (full duplex), On
• SYNC, On
• INTernal CLK, On
• Modem/Network, Modem

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Page 234 of 396 ISL installation

• Auto Answer, On
• Loopback, Off

Note 1: Set only one side of the interface to originate the hot line.

Note 2: Forced Data Terminal Ready (DTR) automatically reinitiates a

dropped hot line call.

ISL installation
Use Procedure 22 to install ISL in dedicated mode. Use Procedure 23 to
install ISL in shared mode.

Modem paths must have individual configurations: route data blocks, trunks,
and routes.

Install ISL in dedicated mode (digital and analog)

DTI or PRI should already be up and running.

Procedure 22
Install ISL in dedicated mode
1 In LD17, configure ISL for dedicated mode.
USR = ISLD
ISLM = Number of trunks handled by this D-channel (1-382)
2 In LD16, configure the Route Data Block to map out the software
parameters for these trunks.
3 Install the modem with leased line functionality.
4 In LD14, reassign old trunks to the routes just built in LD16.
5 In LD16, out the old DTI route. A separate Route Data Block should be
built for Leased Line, or to accommodate the dialing plan for a dedicated
modem.

End of Procedure

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Install ISL in shared mode

DTI or PRI should already be up and running.

Procedure 23
Install ISL in shared mode
1 In LD14, remove the PRI trunks.
2 In LD17, configure ISL for dedicated mode.
USR = SHA
ISLM = Number of trunks handled by this D-channel (1-382)
3 In LD16, build a PRI route data block. This is the same route you just
removed in step 1.
ISDN = YES
4 In LD16 build another route data block to correspond to the IAS routes.
5 In LD14, assign trunks to the newly configured routes.

End of Procedure

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240

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Echo canceller installation

Contents
The section contains information on the following topics:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 237
Echo canceller operating parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . 237
Echo canceller initialization procedures . . . . . . . . . . . . . . . . . . . . . . . . 238
PRI to Echo canceller pin assignments . . . . . . . . . . . . . . . . . . . . . . . . . 238
Electromagnetic Interference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

Introduction
Echo cancellers are required only in cases where satellite transmission is
being used. The echo canceller detects the length of the loop, and cancels out
transmission reflections (which result in audible echoes of voices on
satellite-carried calls).

Echo canceller operating parameters

The operational parameters of the echo canceller must be:
• Data transfer rate: 4800 baud
• System unit number: 1
• Display time-out: active
• Failures before alarm: 3

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Echo canceller initialization procedures

Each of the 24 channels on the echo canceller must be initialized as shown
here:
• Bypass: OFF
• Off-hook: ON
• Canceller only: OFF
• H reset: OFF
• H hold: OFF

PRI to Echo canceller pin assignments

The echo canceller is controlled by an RS-232 port on the PRI circuit pack.
The following tables give the echo canceller pin assignments, operating
parameters and initialization procedures.

See Table 70 for PRI-to-Echo canceller pin assignments; refer to Figure 75

for a PRI-to-Echo-canceller cabling schematic.

Table 70
PRI-to-Echo canceller – pin assignments (Part 1 of 2)

EIA RS-232-C
Echo canceller circuit
Signal PRI pin pin designator

TXD 5 2 BA
(Transmitted Data)

RXD 2 3 BB
(Received Data)

RTS — 4 CC
(Request to Send)

CTS — 5 CB
(Clear to Send)

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Table 70
PRI-to-Echo canceller – pin assignments (Part 2 of 2)

Common Return 10 7 AB
(signal ground)

DCD 1 8 CF
(received line signal detector)

DTR 4 20 CD
(data terminal ready)

Electromagnetic Interference
The Electromagnetic Interference (EMI) filter assembly for PRI is
PO643763. The system meets FCC Part 15, Subpart J, Class A requirements
regarding EMI. In order to accomplish this, the SDI cables must exit the
cabinet through EMI filters on the I/O panel. This procedure depends on the
system cabinet type.

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Figure 75
PRI to echo canceller cabling

Cross-
Connect Echo NCTE
I/O Filter Block Canceller (if required)
XTIP
1
Dis XRING
Act 9
Red
GRD (Shield)
Yel 2 T1
LBk

PRI 3 RTIP Port

11 RRING
GRD (Shield)
J1 Ref 1 4
J4
J1 Ref 2 (if equipped)
J4 Network
J6
RXD (BB) 3
2 RXD
J5 TXD (BA) 2
5 TXD
DCD (CF) 8 DCD RS-232
1
J3 Net Loop Jack
J6 4 DTR (CD) 20
DTR
GRD (AB) 7
S
10 GND
SER 5 CTS
A
4 RTS
QPC720
PRI QCAD129 I/O Filter Optional
cable Cross-
Connect
Block 553-1504

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1.5 Mb PRI implementation

Contents
This section contains information on the following topics:
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
Install PRI hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254

Overview
Digital trunks are supported in the Small System cabinet, the IP expansion
cabinet, and the Media Gateway 1000S (MG 1000S).

This chapter provides the following information required to install PRI on a

system:

• hardware and software installation

• implementation procedures for basic call service

While either the hardware or software can be installed first, the PRI cannot be
enabled and tested until both are completed.

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Hardware requirements

Circuit cards
To implement PRI on the system, the hardware shown in Table 71 is required.

Table 71
Required circuit cards

Circuit card Description

NTRB21 DTI/PRI TMDI card (recommended for

CS 1000S).

NTAK09 DTI/PRI circuit card.

NTAK20 Clock-controller daughterboard. Small

Systems supports only one active clock
controller per system or IP expansion cabinet.

Note: Every cabinet/MG 1000S that contains a

digital trunk must contain a clock controller.
CS 1000S supports only one active clock
controller per MG 1000S.

NTAK93 D-channel-handler (DCH) interface

daughterboard.

NTBK51BA Downloadable D-channel daughterboard

(DDCH). Connects to the NTAK09 DTI/PRI
card.

Cables
The following cables are required for PRI connections:
• PRI to external T1 cable
• NTBK04 carrier cable
• NT8D97 50-foot extension (if needed)

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Channel Service Units (CSU)

When connecting the DTI/PRI to the public network, CSUs are required by
most operating companies. One CSU is required per PRI. Suitable CSUs
which support 64 Kbps clear and Bipolar 8 Zero Substitution (B8ZS) are
available from vendors such as Verilink, Digitalink, Kentrox, and Tellabs.

Note: Contact your Nortel Sales representative for specific local CSU
requirements.

Hardware description

MG 1000S/MG 1000S Expansion

The MG 1000S and MG 1000S Expansion contain physical card slots,
numbered 1 to 10. When configuring the CS 1000S system, the physical card
slot numbers must be transposed to logical card slot numbers. For example,
to configure a card physically located in slot two of the MG 1000S one, use
logical slot 12. To configure a card physically located in slot two of the
MG 1000S two, use logical Slot 22.

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Table 72 on page 244 maps physical card slot numbers to logical card
numbers for the MG 1000S and MG 1000S Expansion and reflects added
support for the MG 1000S and MG 1000S Expansion physical card slot 4.

Table 72
MG 1000S and MG 1000S Expansion slot assignments

MG 1000S/MG 1000S Expansion

First Second Third Fourth

Physical Logical Physical Logical Physical Logical Physical Logical

card card card card card card card card
slot slot slot slot slot slot slot slot

1 11 1 21 1 31 1 41

2 12 2 22 2 32 2 42

3 13 3 23 3 33 3 43
MG 1000S
4 14 4 24 4 34 4 44

5 * 5 * 5 * 5 *

6 * 6 * 6 * 6 *

7 17 7 27 7 37 7 47

MG 1000S 8 18 8 28 8 38 8 48
Expansion
9 19 9 29 9 39 9 49

10 20 10 30 10 40 10 50

Legend
* Not supported.

NTRB21 TMDI card

The NTRB21 TMDI card provides 1.5 MBit/s Digital Trunk Interface or
Primary Rate Interface functionality on the system. The NTRB21 has a
built-in, downloadable D-channel.

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The NTRB21can be equipped with the NTAK09 DTI/PRI card (with the
NTBK51 downloadable D-channel daughterboard) and the NTAK93 DCHI
daughterboard.

Note 3: A TMDI D-channel programmed as a backup D-channel against

a non-TMDI primary D-channel is not supported. Backup D-channels
are supported only when programmed against TMDI primary
D-channels.

Figure 76 on page 246 shows a faceplate of the NTRB21 TMDI card.

Shelf slot assignments

For Small Systems, the NTRB21 can be placed in main and expansion
cabinets in any single card slot given in Table 74 on page 252.

For CS 1000S, the NTRB21 can be placed in MG 1000S systems, in the slots
given in Table 74 on page 252.

The MG 1000S Expansion does not support digital trunks (DTI/PRI).

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Figure 76
NTRB21 TMDI card faceplate

TMDI

OOS
ACT

RED
YEL
LBK
CC
DCH

MAINT
....
....
....
....
....
....
....
....
RS232 Monitor Port ....
....
....
....
....
....
....
....

Rx

Tx

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NTAK09 DTI/PRI circuit card

The NTAK09 Digital Trunk Interface/Primary Rate Interface (DTI/PRI) card
provides the physical interface for the DS-1 facility T-1 carrier on the system.
It is required for PRI and DTI operation and is also used for ISL shared-mode
applications.

Figure 77 on page 248 shows the faceplate layout, the location of the switch
and the position of the daughterboards and connectors.

Shelf slot assignments

For cabinet systems, the NTAK09 DTI/PRI card can be placed in main and
expansion cabinets in any single card slot given in Table 74 on page 252.

For CS 1000S, the NTAK09 can be placed in MG 1000S systems, in the slots
given in Table 74 on page 252.

Digital trunk cards are not supported in the MG 1000S Expansion.

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Figure 77
NTAK09 DTI/PRI circuit card

Stiffeners

1.5
M
DTI B
/PR
I
LEDs DIS
AC
T
RE
D
Connector
YE
LBK
L Sockets
DCH F/W

Len 2
CC

LEN 1
LEN 0
DC
H
Bantam 3 4
1 2
Jacks
RC
V ON
SW

XM
T

NTA
K09

DCH F/W
LEN 0
LEN 1
Len 2
1 2 3 4
Standoffs
Switch ON
SW 553-8294.EPS

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NTAK20 Clock Controller (CC) daughterboard

Digital Trunking requires synchronized clocking so a shift in one clock
source results in an equivalent shift of the same size and direction in all parts
of the network. Synchronization is accomplished with the NTAK20 clock
controller circuit card in each Main and IP expansion cabinet/MG 1000S.

IMPORTANT!
Every Small System cabinet or Media Gateway that contains a digital
trunk must contain a clock controller.

If a Small System is equipped with digital trunks, it is recommended that

at least one digital trunk be placed in the main cabinet. For CS 1000S
systems, the digital trunk must be placed in the MG 1000S.

Note: Clocking slips can occur between systems that are clocked from
different COs, if the COs are not synchronized. The slips can degrade
voice quality.

The Clock Controller circuitry synchronizes the system to an external

reference clock, and generates and distributes the clock to the system. A
Small System can function either as a slave to an external clock or as a
clocking master.

The NTAK20AA version of the clock controller meets AT&T Stratum 3 and
Bell Canada Node Category D specifications. The NTAK20BA version
meets CCITT stratum 4 specifications.

Clocking modes
The system supports a single clock controller that can operate in one of two
modes - tracking or non-tracking (also known as free-run).

Tracking mode
In tracking mode, one or possibly two DTI/PRI cards supply a clock reference
to a clock controller daughterboard. One DTI/PRI is defined as the primary
reference source for clock synchronization, while the other is defined as the
secondary reference source (PREF and SREF in LD 73).

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There are two stages to clock controller tracking, as follows:

• tracking a reference
• locked onto a reference

When tracking a reference, the clock controller uses an algorithm to match its
frequency to the frequency of the incoming clock. When the frequencies are
very nearly matched, the clock controller locks onto the reference. The clock
controller makes small adjustments to its own frequency until incoming and
system frequencies correspond.

If the incoming clock reference is stable, the internal clock controller tracks
it, locks onto it, and matches frequencies exactly. Occasionally, however,
environmental circumstances cause the external or internal clocks to drift.
When this happens, the internal clock controller briefly enters the tracking
stage. The green LED flashes momentarily until the clock controller locks
onto the reference once again.

If the incoming reference is unstable, the internal clock controller is

continuously in the tracking stage, with the LED flashing green all the time.
This condition does not present a problem, instead it shows that the clock
controller is continually attempting to lock onto the signal. However, if slips
are occurring, there is a problem with the clock controller or the incoming
line.

Free-run (non-tracking)
In free-run mode, the clock controller does not synchronize on any source, it
provides its own internal clock to the system. This mode can be used when
the system is used as a master clock source for other systems in the network.
Free-run mode is undesirable if the system is intended to be a slave. It can
occur, however, when both the primary and secondary clock sources are lost
due to hardware faults, or when invoked by using software commands.

Shelf slot assignment

For cabinet systems, the NTAK09 DTI/PRI card can be placed in main and
expansion cabinets in any single card slot given in Table 74 on page 252.

For CS 1000S, the NTAK20 can be placed in MG 1000S systems, in the slots
given in Table 74 on page 252.

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Clock controller LED states

The clock controller LED, on the NTAK09 or NTRB21 faceplates, is in
various states depending on the status of the clock controller.

Table 73
Clock controller LEDs

LED Clock controller

On (Red) NTAK20 is equipped and disabled.

On (Green) NTAK20 is equipped and is either locked to a reference

or in free run mode.

Flashing NTAK20 is equipped and attempting to lock (tracking

(Green) mode) to a reference. If the LED flashes continuously
over an extended period of time, check the CC STAT in
LD 60. If the CC is tracking this can be an acceptable
state. Check for slips and related clock controller error
conditions. If none exist, then this state is acceptable,
and the flashing is identifying jitter on the reference.

Off NTAK20 is not equipped.

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Shelf slot assignments for NTRB21, NTAK09 and NTAK20

Table 74 on page 252 provides the shelf slot assignments for the NTRB21
TMDI card, NTAK09 DTI/PRI card, and NTAK20 Clock Controller
daughterboard in Small Systems and CS 1000S systems. The NTAK 93 DCH
and NTBK51BA DDCH daughterboards are not included in this table since
they are mounted on the NTAK09 DTI/PRI circuit card and not on a shelf.

Table 74
Shelf slot assignments for NTRB21, NTAK09, and NTAK20

NTAK20
Clock controller
daughterboard

NTAK09 Non-
NTRB21 DTI/PRI CISPR B CISPR B
TMDI card circuit card cabinets cabinets

Main 1–9 1–9 1–3 1–9

(see Note 2)

Expansion 1 11 – 19 11 – 19 11 – 13 11 – 19
Small
System Expansion 2 21 – 29 21 – 29 21 – 23 21 – 29

Expansion 3 31 – 39 31 – 39 31 – 33 31 – 39

Expansion 4 41 – 49 41 – 49 41 – 43 41 – 49

MG 1000S 1 11 – 14 11 – 14 11 – 14

CS 1000S MG 1000S 2 21 – 24 21 – 24 21 – 24
(see Note 1) MG 1000S 3 31 – 34 31 – 34 31 – 34

MG 1000S 4 41 – 44 41 – 44 41 – 44

Note 1: For CS 1000S, physical card slots are numbered 1 – 4 on each MG 1000S (see
Table 72 on page 244).

Note 2: On cabinets NTAK11Dx and NTAK11Fx, the active card must be placed in slots 1 – 3
(slots 4 to 10 cannot be used).

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NTAK93 D-channel Handler Interface (DCHI) daughterboard

The NTAK93 DCHI daughterboard interfaces with the system Central
Processing Unit (CPU) and mounts on the NTAK09 DTI/PRI circuit card for
PRI or ISL shared mode applications. The DCHI is responsible for
performing the Q.921 layer 2 protocol information. It transfers layer 3
signaling information between two adjacent network switches.

The NTAK93 DCH daughterboard, when installed on the NTAK09 circuit

card, is addressed in the same slot as the NTAK09. The NTAK93 can use SDI
I/O addresses 0 to 79 and port 1.

Note: I/O addresses 0, 1, 2, 8 and 9 are preconfigured on the Small

System and must not conflict with the I/O addresses on the NTAK93
card.

A minimum of one NTAK93 is required for each PRI link. If more than one
PRI link connects to the same end location, a single DCHI circuit card can
support up to a maximum of sixteen PRI connections for the Small System
and CS 1000S system. This allows a total of 382 B-channels or PRI trunks to
be supported if a backup D-channel is also used. A total of 383 B-channels or
PRI trunks are supported if a backup channel is not used.

NTBK51BA Downloadable D-channel (DDCH) daughterboard

The NTBK51BA DDCH daughterboard interfaces with the Small System
Central Processing Unit (CPU) and mounts on the NTAK09 DTI/PRI circuit
card for PRI D-channel applications. The DDCH is equivalent to the MSDL
card used on a Large System, but it only supports D-channel applications (no
SDI or ESDI).

The NTBK51BA DDCH daughterboard, when installed on the NTAK09

circuit card, is addressed in the same slot as the NTAK09.

A minimum of one NTBK51BA is required for each PRI link. If more than
one PRI link connects to the same end location, a single DDCH circuit card
can support up to a maximum of sixteen PRI connections for the Small
Systems and CS 1000S systems. This allows a total of 382 B-channels or PRI
trunks to be supported if a backup D-channel is also used. A total of 383
B-channels or PRI trunks are supported if a backup channel is not used.

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For more information on expansion daughterboards, refer to Communication

Server 1000M and Meridian 1: Small System Planning and Engineering
(553-3011-120).

Install PRI hardware

Install/remove daughterboard on the NTRB21 TMDI card

Procedure 24
Mounting the NTAK20 daughterboard on the NTRB21
Work on a flat surface when mounting or removing daughterboards.
1 Visually inspect the connector pins on the underside of the
daughterboard. Straighten and re-align any bent pins prior to mounting.
2 Place the NTRB21 down flat on an anti-static pad.
3 From an overhead view, with the daughterboard parallel above the
NTRB21 and the connector pins aligned over the connector sockets, line
up the mounting holes on the daughterboard (Figure 78 on page 255)
with the tops of the standoffs on the NTRB21.
4 Slowly lower the daughterboard towards the NTRB21, keeping the
standoffs in line with all four holes, until the holes are resting on the tops
of the four standoffs.
If more than a very slight amount of pressure is required at this point, the
connector pins cannot be aligned with the connector socket. If so, lift the
daughterboard off the NTRB21 and return to step 2.
5 Gently apply pressure along the edge of the board where the connector
is located until the standoffs at the two corners adjacent to the connector
snap into a locked position. Then press down on the two corners on the
opposite side until they also lock into place.

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Figure 78
NTAK20 daughterboard installation on the NTRB21

Connector Socket

DCH F/W
LEN 0
LEN 1
Len 2
1 2 3 4
Stiffeners
ON
SW
Connector Pins

TMD
I
LEDs OO
S
NTAK20
AC
RE
T Clock
D
YE
L Controller
LBK
CC
DC
H
Bantam
Jacks Mounting Holes
RC
V

XM
T

NTR
B21

Standoffs

553-9024

End of Procedure

Insert/remove the NTRB21 TMDI card

Refer to Table 74 on page 252 to determine the slot assignment for the
NTRB21 TMDI circuit card appropriate to the system.

The NTRB21 card is installed only in the MG 1000S. It is not supported in

the MG 1000S Expansion.

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Procedure 25
Inserting the NTRB21 TMDI card
1 Check for available card slots in the base cabinet and print the
configuration record to determine which slots can be used. To do this,
enter the following command in LD 22:
PRT CFN in LD 22
2 If in PRI mode, enter the following command in LD 96 to software disable
the D-channel:
DIS DCH x
where x is the DCH port number that was assigned in LD 17.
3 If the Clock Controller is enabled, enter the following command in LD 60
to software disable it:
DIS CC 0
4 Hold the NTRB21 by the lock latch, unlock the latch, and slide the card
into the cabinet.
Note 1: Refer to Table 74 on page 252 to determine the correct slot in
which to insert the card.
Note 2: For CS 1000S, the NTRB21 is installed only in the MG 1000S. It
is not supported in the MG 1000S Expansion.
5 Enter the following command in LD 96 to enable the TMDI card:
ENL TMDI x ALL
where x is the NTRB21 TMDI card number (DLOP). The card number
associated with an NTRB21 TMDI card is based on the slot in which the
card is installed.
6 Within about 30 seconds, the D-channel layer 3 should be established. To
confirm, enter the following command in LD 96 to request the current
status of the D-channel:
STAT DCH (N)
The system response is:
DCH N EST OPER
This means that the D-channel is established and operational.

End of Procedure

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Procedure 26
Removing the NTRB21 TMDI card
1 If in PRI mode, enter the following command in LD 96 to software disable
the D-channel:
DIS DCH x
where x is the DCH port number that was assigned in LD 17.
2 If the Clock Controller is enabled, enter the following command in LD 60
to software disable it:
DIS CC 0
3 Enter the following command in LD 96 to disable the NTRB21 TMDI card:
DIS TMDI x All
where x is the NTRB21 TMDI card number (DLOP). The card number
associated with a NTRB21 TMDI card is based on the slot in which the
card is installed.
4 Hold the NTRB21 by the lock latch, unlock the latch, and slide the card
out from the cabinet.

End of Procedure

Install/remove daughterboards on the NTAK09 DTI/PRI card

Procedure 27
Mounting the daughterboards on the NTAK09
Use these guidelines to mount the NTAK20 CC and the NTAK93 DCHI or
NTBK51 DDCH daughterboards on the NTAK09 DTI/PRI card. Because of the
physical layout of the mother and daughterboards, the NTAK93 or NTBK51
should be mounted before the NTAK20. Work on a flat surface when mounting
or removing daughterboards.
1 Visually inspect the connector pins on the underside of the
daughterboard. Straighten and re-align any bent pins prior to mounting.
2 Place the NTAK09 down flat on an anti-static pad.
3 From an overhead view, with the daughterboard parallel above the
NTAK09 and the connector pins aligned over the connector sockets, align
the mounting holes on the daughterboard (Figure 79 on page 259) with
the tops of the standoffs on the NTAK09.

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4 Slowly lower the daughterboard toward the NTAK09, keeping the

standoffs in line with all four holes, until the holes rest on top of the four
standoffs.
Note: If more than a very slight amount of pressure is required at this
point, the connector pins are not aligned with the connector socket. If so,
lift the daughterboard off the NTAK09 and return to step 2.
5 Gently apply pressure along the edge of the board where the connector
is located until the standoffs at the two corners adjacent to the connector
snap into a locked position. Then press down on the two corners on the
opposite side until they also are locked into place.

End of Procedure

Procedure 28
Removing the daughterboards from the NTAK09
Use these guidelines to remove the NTAK20 Clock Controller (CC) and the
NTAK93 DCHI or NTBK51 DDCH daughterboards from the NTAK09 DTI/PRI
card. Because of the physical layout of the mother and daughterboards, the
NTAK20 should be removed before the NTAK93 or NTBK51.
1 Starting at the two corners opposite the connector, gently lift each corner
out of the locking groove of the standoff.
2 At the two corners adjacent to the connector, gently lift the entire side until
the mounting holes are clear of the locking groove of the standoff.
3 To remove the connector pins, grasp the edge of the board adjacent to
the connector and lift gently.

If more than one NTAK09 card is installed, the additional cards might not carry
daughterboards, depending on the system configuration. At least one NTAK20
(per system) is always required.

End of Procedure

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Figure 79
Daughterboard installation on the NTAK09

Connector Pins

DCH F/W
Connector Socket
LEN 0
LEN 1
Len 2

1 2 3 4
Stiffeners
ON
SW
NTAK20
Clock
Controller

1.5
M
DTI B
/PR
Mounting Holes
I
LEDs DIS
AC
T
RE
D
YE
L
LBK
DCH F/W

Len 2

CC
LEN 1
LEN 0

DC
H
Bantam 3 4
1 2
Jacks NTAK93
RC
V ON
SW DCHI
or
XM
NTBK51BA
T
DDCH
NTA
K09

Standoffs
Switch
553-8295.EPS

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Set switches on NTAK09 DTI/PRI card

Set the switches on the NTAK09 DTI/PRI card according to Table 75.

Table 75
NTAK09 switch settings

Distance to digital 1 2 3 4
cross-connect DCH F/W (LEN 0) (LEN 1) (LEN 2)

0 - 133 feet Off Off Off On

133 - 266 feet Off On On Off

266 - 399 feet Off Off On Off

399 - 533 feet Off On Off Off

533 - 655 feet Off Off Off Off

Installing the NTAK09

Refer to Table 74 on page 252 to determine the slot assignment for the
NTAK09 DTI/PRI circuit card appropriate to the system.

The NTAK09 DTI/PRI card is installed only in the MG 1000S. It is not

supported in the MG 1000S Expansion.

Procedure 29
Installing the NTAK09
1 Check for available card slots in the base and expansion cabinets, and
MG 1000S systems and print the configuration record to determine which
slots can be used. To do this, enter the following command in LD 22:
PRT CFN
2 Hold the NTAK09 by the lock latch, unlock the latch, and slide the card
into the cabinet.

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Note 1: Refer to Table 74 on page 252 to determine the correct slot in

which to insert the card.
Note 2: For CS 1000S, the NTAK09 is installed only in the MG 1000S. It
is not supported in the MG 1000S Expansion.

End of Procedure

Procedure 30
Connecting the cables
The only cable required to support the NTAK09 DTI/PRI circuit card is the
NTBK04 cable. The cable is twenty feet long. If additional distance is required,
the NT8D97AX fifty-foot extension is available up to a 600 foot maximum.
Table 76 on page 262 gives pinout information for the NTBK04.
1 Connect the NTBK04 cable to a 50-pin Amphenol connector on the
cabinet.
For a Small System, the Amphenol connector is located below the card
slot in which the NTAK09 circuit card is installed.
For a CS 1000S system, the Amphenol connector is located on the rear
of the Media Gateway. The Amphenol connectors are labelled with the
card slot numbers to which they correspond.
2 Connect the other end of the cable to the CSU or DSX-1 cross connect.

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Table 76
DS-1 line interface pinout for NTBK04 cable

From 50-pin Signal

MDF connector to DB-15 name Description

pin 48 pin 1 T transmit tip to network

pin 23 pin 9 R transmit ring to

network

pin 25 pin 2 FGND frame ground

pin 49 pin 3 T1 receive tip from

network

pin 24 pin 11 R1 receive ring from

network

End of Procedure

Procedure 31
Enabling the NTRB21 TMDI card
1 Enter the following command in LD 96 to enable the NTRB21 TMDI card:
ENL TMDI x ALL
where x is the NTRB21 TMDI card number (DLOP). The card number
associated with a NTRB21 TMDI card is based on the slot in which the
card is installed.
2 If in PRI mode, enter the following command in LD 96 to software enable
the D-channel:
ENL DCH y
where y is the DCH port number that was assigned in LD 17.
3 Within about 30 seconds, the D-channel layer 3 should be established. To
confirm, enter the following command in LD 60 to request the current
status of the D-channel:
STAT DCH (N)

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The system response is:

DCH N EST OPER
This means that the D-channel is established and operational.

End of Procedure

Procedure 32
Enabling the NTAK09 DTI/PRI card
Note: The DCHI and PRI cards must be configured prior to software
enabling the NTAK09. Refer to the procedure “Implementing basic PRI”
on page 264 for further information.
1 Enter the following command in LD 60 to software enable all NTAK09
DTI/PRI cards:
ENLL C
where C is the DTI/PRI card number (DLOP). The card number
associated with a DTI/PRI card is based on the slot in which the card is
installed.
Under normal conditions, this step enables the clock controller and
D-channel interface. If enable fails, enter the following command in LD 60
to software enable clock tracking on the primary digital card:
ENL CC 0
2 Enter the following command in LD 96 to software enable the NTAK93
(DCHI) daughterboard:
ENL DCHI N
where N is the DCHI I/O address.
3 Within about 30 seconds, the D-channel layer 3 should be established. To
confirm, enter the following command in LD 60 to request the current
status of the D-channel:
STAT DCH (N)
The system response is:
DCH N EST OPER

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This means that the D-channel is established and operational.

End of Procedure

Procedure 33
Implementing basic PRI
Use this procedure to configure the PRI cards, DCHI interface, DCH link and
ISDN trunk route and trunks (B-channels) that are required to implement PRI
between systems. No feature applications other than Basic Call Service are
included in the implementation.
PRI cards must be configured before defining the DCH links or PRI
applications.
Prompts which do not show a response can be left as default. For more
information on any of these prompts, refer to Software Input/Output:
Administration (553-3001-311).
Before installing PRI cards in an IP expansion cabinet/MG 1000S, first
configure the expansion cabinet/MG 1000S for IP connectivity. Refer to
LD 117 in the Software Input/Output: Maintenance (553-3001-511) for further
information.
To implement PRI on the system:
1 Add a PRI card. See “Define clock synchronization. See “LD 73 —
Defining system timers and clock controller parameters” on page 272.” on
page 264.
2 Add a DCHI card. See “LD 17— Adding a PRI card” on page 265.
3 Define a PRI customer. See “LD 15 — Defining a PRI customer” on
page 267.
4 Define a PRI service route. See “LD 16 — Configuring an ISDN service
route” on page 270.
5 Define service channels (B-channels) and PRI trunks. See “LD 14 —
Defining service channels and PRI trunks” on page 271.
6 Define clock synchronization. See “LD 73 — Defining system timers and
clock controller parameters” on page 272.

End of Procedure

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LD 17— Adding a PRI card

Prompt Response Description

REQ CHG Change existing data.

TYPE CFN Configuration data block.

CEQU YES Changes to common equipment.

PRI loop x For Large Systems

card x For Small Systems and CS 1000S Systems

TMDI (Yes) TMDI Card (Mode set to PRI OR TRK) Option 11C Cabinet
No Other card

LD 17 — Adding a D-channel interface (Part 1 of 3)

Prompt Response Description

REQ CHG Change existing data.

TYPE ADAN Action Device And Number.

- ADAN NEW DCH xx Add a primary D-channel (any unused SDI port.)
CHG DCH xx Change a primary D-channel.
OUT DCH xx Remove the primary D-channel, where:
xx =0-79.

- CTYP DCHI DCHI = D-channel configuration for the NTAK09 card or

NTAK93.
MSDL MSDL = NTBK51 Downloadable D-channel
daughterboard.
TMDI TMDI = D-channel configuration on TMDI (NTRB21) card.

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LD 17 — Adding a D-channel interface (Part 2 of 3)

Prompt Response Description

- CDNO 1-50 Card slot number to be used as the primary DDCH/DCHI.

Card slots 10, 20, 30, 40, and 50 are only applicable for
D-channel configuration of ISL or VNS.

- PORT 1 PORT must be set to 1.

- DES <CR> Designator.

- USR PRI D-channel is for ISDN PRI only.

- IFC xx Interface type.

- - DCHL xx PRI loop number.

- OTBF 1-(16)-127 Number of output request buffers.

Note: For a single PRI link, leave this prompt at default

(16). Add 5 output request buffers per additional link.

- DRAT 64KC D-channel transmission rate.

- SIDE NET (USR) Prompted only if IFC is set to SL1.

NET = network, the controlling switch.
USR = slave to the controller.

- RLS xx Release ID of the switch at the far-end of the D-channel.

- RCAP ND2 Remote capability.

- OVLR YES (NO) Allow or disallow overlap receiving on a D-channel.

Default is NO. Enter carriage return if settings are to be
left at default.

- LAPD YES (NO) Change LAPD parameters. Enter carriage return if timers
are to be left at default. The following timers are prompted
only if LAPD is set to YES. (They can all be left at default
during initial set-up.)

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LD 17 — Adding a D-channel interface (Part 3 of 3)

Prompt Response Description

- - T23 1-(20)-31 Interface guard timer checks how long the interface takes
to respond. In units of 0.5 seconds
(default 20 = 10 seconds).

- - T200 2-(3)-40 Retransmission timer in units of 0.5 seconds

(default 3 = 1.5 seconds).

- - N200 1-(3)-8 Maximum number of retransmissions.

- - N201 4(260) Maximum number of octets in information field.

--K 1-(7)-32 Maximum number of outstanding unacknowledged

frames (NAKS).

LD 15 — Defining a PRI customer (Part 1 of 3)

Prompt Response Description

REQ: NEW Add new data.

CHG Change existing data.

TYPE: NET Networking Data.

CUST Customer number

0-99 Range for Large System, Call Server 1000E, and
Media Gateway 1000E

0-31 Range for Small System, CS 1000S system,

Media Gateway 1000B, and Media Gateway 1000T

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LD 15 — Defining a PRI customer (Part 2 of 3)

Prompt Response Description

LDN0 xxxx Listed Directory number 0 must be defined for ISDN

PRI DID service.

The length of LDN0 determines the number of trailing

digits translated as the dialed DN on PRI DID routes.

Up to seven digits can be entered if DNXP option 150 is

equipped. Otherwise, up to four digits can be entered.

AC2 ESN Access Code 2. Enter incoming ISDN call types

(NARS network translation types) for which AC2 must
be inserted when INAC = YES in LD 16.

Multiple responses are allowed. Prompted only if NARS

is equipped. If a NARS call type is not entered here, it is
defaulted to AC1.

NPA E.164 National.

NXX E.164 Subscriber.
INTL International.
SPN Special Number.
LOC Location Code

ISDN YES Customer is equipped with ISDN.

- PNI (0) 1-32700 Private Network Identifier. Each customer data block
must have a unique PNI when multi-customer option is
equipped. PNI = 1 is typical for CUST = 0. It must be
matched by the PNI in the far-end RDB.

Note: Using the default value of PNI = 0 prevents

operation of features like NRAG, NACD and NMS.

- HNPA NPA Telephone area code for this system. Sent as part of
setup message as calling line identification.

- HNXX NXX Telephone local exchange code for this system. Sent
as part of setup message as calling line identification.

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LD 15 — Defining a PRI customer (Part 3 of 3)

Prompt Response Description

- - HLOC XXX Home location code (NARS), prompted when

PRA = YES.

- - LSC 1-9999 One to four digit Local Steering Code, if required in the
Coordinated Dialing Plan (CDP). LSCs are required
only if the CDP DNs are longer than the local PDNs.

The CLID sent for a CDP call is composed of the LSC

defined in LD 15 plus the PDN of the calling set.
Various ISDN network features depend on the CLID as
the “return address” for sending feature control
messages.

Multiple LSCs can be defined in LD 87 for CDP, but

only one LSC can be defined here for CLID.

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LD 16 — Configuring an ISDN service route (Part 1 of 2)

Prompt Response Description

REQ NEW Add new data.

CHG Change existing data.

TYPE RDB Route data block.

TKTP xxx Trunk type.

DTRK YES Digital trunk route.

- DGTP PRI 1.5 Mb PRI. Prompted only if PRA = YES in LD15.

ISDN YES ISDN option.

- MODE PRA Route used for PRA only.

- - PNI (0) 1-32700 Private Network Identifier. Each customer data block
must have a unique PNI when multi-customer option is
equipped. PNI = 1 is typical for CUST = 0. It must be
matched by the PNI in the far-end RDB.

Note: Using the default value of PNI = 0, prevents

operation of features like NRAG, NACD and NMS.

IFC xx Interface type.

- CHTY BCH Signalling type - prompted if DTRK is YES. D-channel

signalling for B-channels.

- CTYP <CR> Call Type. Enter the call type to be associated with the
outgoing route for direct dialing using the trunk access
code (instead of NARS access code).

See the Software Input/Output: Administration

(553-3001-311) for a listing of possible responses.

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LD 16 — Configuring an ISDN service route (Part 2 of 2)

Prompt Response Description

- INAC YES Insert ESN Access Code based on NARS/BARS call

type for incoming calls on TIE routes only. If NARS is
equipped, this feature inserts AC1 or AC2, depending
on the responses to AC2 in LD 15 Customer Data
Block.

For NARS/BARS call types, INAC bypasses incoming

digit insertion specified by INST in LD 16 Route Data
Block.

Unknown call types, including CDP steering codes, are

not affected by INAC, and do not bypass digit insertion
specified by INST.

INAC must be set to YES to support features such as

Network ACD and Network Message Services, which
depend on non-call associated TCAP facility
messages.

LD 14 — Defining service channels and PRI trunks (Part 1 of 2)

Prompt Response Description

REQ NEW Add new data.

CHG Change existing data.

When assigning several members at once use the multiple

create command NEW XX.

TYPE TIE TIE Trunk only, allowed between MSL-1.

TN l ch Loop and channel for digital trunks

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LD 14 — Defining service channels and PRI trunks (Part 2 of 2)

Prompt Response Description

RTMB Route number and Member number

0-511 1-510 Range for Large System and CS 1000E system.

0-127 1-4000 Range for CS 1000M Small System, Meridian 1 Small System,
CS 1000S system, Media Gateway 1000B, and
Media Gateway 1000T.

LD 73 — Defining system timers and clock controller parameters (Part 1 of 2)

Prompt Response Description

REQ CHG Change existing data.

TYPE PRI 1.5 Mb PRI.

FEAT SYTI System timers.

CCO xx Card slot number for Clock Controller 0.

PREF CCO xx Card number of PRI/DTI/SILC containing the primary clock

reference for the main cabinet

SREF CCO xx Card number of PRI/DTI/SILC containing the primary clock

reference for the main cabinet

CC1 xx Card number for Clock Controller 1.

PREF CC1 xx Primary Reference DTI/PRI loop for Clock controller one.

SREF CC1 xx Secondary Reference DTI/PRI loop for Clock controller one.

CC2 xx Card number for Clock Controller 2.

PREF CC2 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

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LD 73 — Defining system timers and clock controller parameters (Part 2 of 2)

Prompt Response Description

SREF CC2 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

CC3 xx Card number for Clock Controller 3.

PREF CC3 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

SREF CC3 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

CC4 xx Card number for Clock Controller 4.

PREF CC4 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

SREF CC4 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

CCAR 0-(15) Clock Controller Audit Rate.

Enter the time (in minutes) between normal CC audits.

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1.5 Mb DTI implementation

Contents
This section contains information on the following topics:
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 276
Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
Install DTI hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
Software enable the DTI/PRI cards. . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

Overview
This chapter provides the information required to install DTI on a system,
including:
• hardware and software installation
• implementation procedures for basic call service

This chapter covers the most common type of Nortel DTI installation – a
24-channel Digital Trunk Interface (DTI) installation between two systems,
or between a system and a central office.

Digital trunks are supported in Small System IP expansion cabinets.

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Hardware requirements
To implement DTI on the system, the hardware listed in Table 77 is required:

Table 77
DTI hardware

Item Description

NTRB21 DTI/PRI TMDI card

NTAK09 DTI/PRI Circuit card

NTAK20 Clock Controller Daughter board.

Option 11C Cabinet support only one active

Clock Controller per IP Expansion cabinet.
CS 1000S supports only one active clock
controller per MG 1000S.

NTBK04 Carrier Cable

Cables
The following cables are required for DTI connections:
• DTI to external T1 cable
• NTBK04 carrier cable
• NT8D97 50-foot extension (if needed)

Channel Service Units (CSU)

When connecting the DTI/PRI to the public network, Channel Service Units
(CSUs) are required by most operating companies. One CSU is required per
DTI. Suitable CSUs which support 64 Kbps clear and Bipolar 8 Zero
Substitution (B8ZS) are available from vendors such as Verilink, Digitalink,
Kentrox and Tellabs.

Contact your Nortel Sales representative for specific local CSU requirements.

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Hardware description
Refer to “Hardware description” on page 243.

Install DTI hardware

Refer to “Install PRI hardware” for information on installing DTI hardware.
Specifically:
• To install the NTRB21 DTI/PRI card, see “Insert/remove the NTRB21
TMDI card” on page 255.
• To install the NTAK09 DTI/PRI card, see “Installing the NTAK09” on
page 260.
• To install the NTAK20 Clock Controller, see “Install/remove
daughterboards on the NTAK09 DTI/PRI card” on page 257.

Set the switches

Set the switches on the NTAK09 DTI/PRI card according to Table 78.

Table 78
NTAK09 switch settings

Distance to digital 1 2 3 4
cross-connect DCH F/W (LEN 0) (LEN 1) (LEN 2)

0 - 133 feet Off Off Off On

133 - 266 feet Off On On Off

266 - 399 feet Off Off On Off

399 - 533 feet Off On Off Off

533 - 655 feet Off Off Off Off

Connect the cables

For Small Systems, connect the NTBK04 cable to the 50-pin amphenol
connector below the card slot in which the NTAK09 circuit card is installed.
Connect the other end of the cable to the CSU or DSX-1 cross connect.

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For CS 1000S, connect the NTBK04 cable to a 50-pin amphenol connector

on the rear of the Media Gateway. The amphenol connectors are labelled with
the card slot numbers to which they correspond.

The NTBK04 is twenty feet long. If additional distance is required, the

NT8D97AX 50-foot extension is available up to a 600-foot maximum. The
only cable required to support the NTAK09 circuit card is the NTBK04.

Pinout information on the NTBK04 cable is given in Table 79.

Table 79
DS-1 line interface pinout for NTBK04 cable

From 50-pin to DB-15 Signal Description

MDF connector name

pin 48 pin 1 T transmit tip to network

pin 23 pin 9 R transmit ring to

network

pin 25 pin 2 FGND frame ground

pin 49 pin 3 T1 receive tip from

network

pin 24 pin 11 R1 receive ring from

network

Software enable the DTI/PRI cards

Procedure 34
Enabling the NTRB21 TMDI card
1 Enter the following command in LD 96 to enable the NTRB21 TMDI card:
ENL TMDI x ALL
where x is the NTRB21 TMDI card number (DLOP). The card number
associated with a NTRB21 TMDI card is based on the slot in which the
card is installed.

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2 If in DTI mode, enter the following command in LD 96 to software enable

the D-channel:
ENL DCH y
where y is the DCH port number that was assigned in LD 17.
3 Within about 30 seconds, the D-channel layer 3 should be established. To
confirm, enter the following command in LD 60 to request the current
status of the D-channel:
STAT DCH (N)
The system response is:
DCH N EST OPER
This means that the D-channel is established and operational.

End of Procedure

Procedure 35
Enabling the NTAK09 card
The DCHI and DTI cards must be implemented prior to software enabling the
NTAK09. Refer to the section “Implementing basic PRI” on page 264 for
further information.
1 Enter the following command in LD 60 to software enable all NTAK09
DTI/PRI cards:
ENLL C
where C is the DTI/PRI card number (DLOP). The card number
associated with a DTI/PRI card is based on the slot in which the card is
installed.
Under normal conditions, this step enables the clock controller and
D-channel interface. If enable fails, go to step 2.
2 Optional: Enter the following command in LD 60 to enable clock tracking
on the primary digital card:
ENL CC 0
3 Enter the following command in LD 96 to software enable the NTAK93
(DCHI) daughterboard:
ENL DCHI N
where N is the DCHI I/O address.

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4 Within about 30 seconds, the D-channel layer 3 should be established. To

confirm, enter the following command in LD 60 to request the current
status of the D-channel:
STAT DCH (N)
The system response is:
DCH N EST OPER
This means that the D-channel is established and operational.

End of Procedure

Procedure 36
Implementing DTI
Use this procedure to implement the DTI software interface between systems
or between a system and a central office.
1 Add a DTI card. See “LD 17 — Adding a DTI card” on page 281.
2 Configure a DTI trunk route. See “LD 16 — Configuring a DTI trunk route”
on page 282.
3 Configure the trunks. See “LD 14 — Configuring the trunks” on page 282.
4 Assign clock’s reference source. See “LD 73 — Assigning a clock's
reference source” on page 283.

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LD 17 — Adding a DTI card

Prompt Response Description

REQ CHG Change existing data.

TYPE CFN Configuration data block.

...

PARM YES

...

PCML (MU) A System PCM law.

Default is MU law.

...

CEQU YES Changes to common equipment.

DLOP ll dd ff Digital Trunk Interface Loop or Loops

MODE TRK Select Digital Trunk Interface mode.

TMDI (YES) NO Whether the card is a TMDI card.

YALM DG2 (FDL) Yellow alarm method — prompted only if the frame
format is ESF — Must match the far end.

Use FDL with ESF and use DG2 with non-ESF. If not
prompted then DG2 is set automatically.

TRSH 0-15 The maintenance and threshold table to be used for

this DTI card, as configured in LD 73.

T1TE 012 T1 Transmit Equalization (0=0-200 ft., 1=200-400 ft,

2=400-700 ft). Only for TMDI = YES.

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LD 16 — Configuring a DTI trunk route

Prompt Response Description

REQ NEW Add new data.

CHG Change existing data.

TYPE RDB Route data block.

TKTP Create a trunk route.

COT Central Office Trunk data block

WAT WATS Trunk data block
DID Direct Inward Dial Trunk data block
TIE TIE Trunk data block
FEX Foreign Exchange

DTRK YES Digital trunk route.

LD 14 — Configuring the trunks

Prompt Response Description

REQ NEW Add new data.

CHG Change existing data.

TYPE xxx Trunk type

TN l ch Loop and channel for digital trunks

RTMB Route number and Member number

0-511 1-4000 Range for Large System and CS 1000E system.

0-127 1-4000 Range for CS 1000M Small System, Meridian 1 Small

System, CS 1000S system, Media Gateway 1000B,
and Media Gateway 1000T.

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LD 73 — Assigning a clock's reference source (Part 1 of 2)

Prompt Response Description

REQ CHG Change existing data.

TYPE DDB Digital Data Block.

CCO xx Card slot number for Clock Controller 0.

PREF CCO xx Card number of PRI/DTI/SILC containing the primary

clock reference for the main cabinet

SREF CCO xx Card number of PRI/DTI/SILC containing the primary

clock reference for the main cabinet

CC1 xx Card number for Clock Controller 1.

PREF CC1 xx Primary Reference DTI/PRI loop for Clock controller

one.

SREF CC1 xx Primary Reference DTI/PRI loop for Clock controller

one.

CC2 xx Card number for Clock Controller 2.

PREF CC2 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC

containing the primary clock reference.

SREF CC2 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC

containing the primary clock reference.

CC3 xx Card number for Clock Controller 3.

PREF CC3 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC

containing the primary clock reference.

SREF CC3 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC

containing the primary clock reference.

CC4 xx Card number for Clock Controller 4.

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LD 73 — Assigning a clock's reference source (Part 2 of 2)

Prompt Response Description

PREF CC4 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC

containing the primary clock reference.

SREF CC4 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC

containing the primary clock reference.

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Contents
This section contains information on the following topics:
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 285
Basic ISL implementation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 291

Overview
This chapter contains the information required to implement ISL on the
system. It describes:
• hardware and software installation
• hardware and software configuration for basic call service

Two modes of ISL are available: shared and dedicated. This chapter covers
the most common type of Nortel ISL installation, an ISDN Signaling Link
(ISL) installation in dedicated mode using dedicated and leased lines.

Hardware requirements
To implement ISL regardless of operation mode, analog or digital TIE lines
are used as B-channels:
• NT8D15 or NT8D14 Analog TIE Trunk cards
• NTAK09 Digital trunk cards (for shared mode)
• NTAK02 SDI/DCH card (for dedicated mode)

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Shared mode
In shared mode, PRI hardware plus the existing TIE line interface card is
required.

Dedicated mode
Dedicated mode requires modems. See Figure 80 on page 287 and Figure 81
on page 288 for details.

The requirements for using a leased line are

Table 80
Leased line requirements

Hardware Comments

NTAK02 D-channel Handler Interface

(DCHI) Card for ISL mode.

Modem Modem capable of the following:

(such as Ventel 2400-33 or 2400
Plus II)

- minimum of 2400 baud

- synchronous operation

- must support leased line (also

known as private line or
point-to-point) operation

NTAK19BA Four port break out cable.

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Figure 80
ISL in dedicated mode using leased line

MG 1000S ISL D-channel Large System

leased lines
modem modem
DCHI DCHI
DCHI

¥
¥
ISL
Analog/Digital
TIE trunks
553-AAA1984

Using dial-up modems

The requirements for using a dial-up modem are:

Table 81
Dial-up modem requirements (Part 1 of 2)

Hardware Comments

NT8D09 500 set line card.

NTAK02 D-channel Handler Interface

(DCHI) Card (for ISL mode).

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Table 81
Dial-up modem requirements (Part 2 of 2)

Hardware Comments

Modem Modem capable of the following:

(such as Ventel 2400-33 or 2400
Plus II)

- minimum of 2400 baud

- synchronous operation

- modems are programmed such

that one modem originates the call
while the other auto-answers

- auto-dial capability

NTAK19BA Four port break out cable.

Figure 81
ISL in dedicated mode using dial-up modem

Small System Large System

DCHI modem modem DCHI

500 twisted twisted 500

line pair pair line

ISL D-channel
TIE TIE

TIE TIE
ISL TIE trunks
553-AAA1070

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ISL hardware installation (dedicated mode)

Use Procedure 37 to install hardware for an ISDN Signaling Link (ISL) in
dedicated mode using dedicated leased lines. For shared mode, hardware
installation is identical to the PRI installation found in “1.5 Mb PRI
implementation” on page 241, with the addition of analog or digital TIE
Trunks or both.

The NTAK02 connects to a modem via the NTAK19BA four-port cable.

Only ports 1 and 3 are available for use as DCHIs.

Procedure 37
Installing ISL hardware
1 Set option switches/jumpers on the NTAK02 card as shown in Table 82
and Table 83 on page 290 for mode of operation (RS232 or RS422 and
DTE or DCE.)

Table 82
NTAK02 switch setting

Port 0 Port 1 SW 1-1 SW 1-2

SDI DCH OFF OFF

SDI DPNSS OFF ON

— ESDI ON ON

Port 2 Port 3 SW 1-3 SW 1-4

SDI DCH OFF OFF

SDI DPNSS OFF ON

— ESDI ON ON

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Table 83
NTAK02 jumper settings

Unit Jumper location Strap for DTE Strap for DCE

Unit 0 J10 C-B B-A

Unit 1 J7 C-B B-A

J6 C-B B-A

Unit 2 J5 C-B B-A

Unit 3 J4 C-B B-A

J3 C-B B-A

Unit Jumper location RS422 RS232

Unit 0 — — —

Unit 1 J9 C-B B-A

J8 C-B B-A

Unit 2 — — —

Unit 3 J2 C-B B-A

J1 C-B B-A

2 Install the NTAK02 in any available slot 1-10 of the Option 11C Cabinet or
slot 11-14 of MG 1000S 1.
Note: For CS 1000S, physical card slots are numbered 1-4 on the first,
second, third and fourth MG 1000S.

3 Install the NTAK19BA four-port cable on the 50-pin Amphenol connector

associated with the slot the NTAK02 is installed in.
4 If the installation is a dedicated mode using leased line modem
configuration, the D-channel connects the DCHI with the far-end modem
over a dedicated leased line. The modems must have a minimum
transmission rate of 2400 baud and must support leased line capability
and synchronous mode, 2-wire or 4-wire operation.

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Modems such as Ventel 2400 Plus II can be used. You must specify
4-wire operation when ordering. Otherwise, the modem is factory shipped
for 2-wire operation.
Note: The Hayes Smart modem 2400 cannot be used on leased lines.
5 If the installation is a dedicated mode using dial-up modem (such as
Hayes 2400, Ventel 2400 or Gandalf 2400) configuration, the DCHI is
connected to a modem that is connected to a 500 set line card. The call
is connected to the far-end via the 500 set-to-TIE Trunk path.
Note: Dedicated mode using leased line modems is the preferred
method.
6 Set up the D-channel. Configure the modem at one end in the auto-dial
mode so it automatically initiates a call to the other end at power-up. The
auto-dial number must be coordinated with the far-end switch. The
originating modem must have this auto-dial number stored internally as
part of the modem configuration routine. The far-end modem must be
configured for auto-answer.

End of Procedure

Basic ISL implementation

Implement dedicated mode

Use Procedure 38 to configure basic ISL capability. It applies to analog TIE
Trunks that are used as B-channels. When DTI/PRI trunks are also used,
LD 17 digital loop (DLOP) and LD 73 (digital data block-DDB) must also be
configured with the appropriate clocking and threshold settings.

The DCHI in this case uses the NTAK02 circuit card and does not support
ISDN PRI signaling. The DCHI is reserved for ISL use only. The D-channel
can communicate with the far-end by means of a dedicated leased line modem
or dial-up modem.

For ISL dedicated mode using a dial-up modem, a 500 set, TIE Trunk route
and member have to be configured (used for D-channel).

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Procedure 38
Implementing dedicated mode
Configuring dedicated mode involves four major steps:
1 Configure the D-channel for ISL (LD 17).
2 Enable ISDN option (LD 15).
3 Enable the ISL option on a per route basis, assigning a D-channel for
each route (LD 16).
4 Assign a channel identification to each trunk with the ISL option (LD 17).
LD 17 — Configuring the D-channel for ISL (Part 1 of 2)

Prompt Response Description

REQ NEW Add new data.

CHG Change existing data.

TYPE CFN Configuration data block.

ADAN NEW DCH Add primary D-channel.

0-79

CTYP DCHI D-channel card type.

CDNO 1-9 11-19 21-29 Card slot in which the card supporting the DCHI
31-39 41-49 resides.

PORT 1 Must be set to 1.

USR PRI D-channel for ISDN PRI only.

IFC SL1 Interface type.

DCHL 1-9 PRI card number (Must match entry for CDNO).

SIDE NET (USR) Net: network, the controlling switch.

User: slave to controller.

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LD 17 — Configuring the D-channel for ISL (Part 2 of 2)

Prompt Response Description

RLS XX Software release of far-end. This is the current software

release of the far-end. If the far-end has an
incompatible release of software, it prevents the
sending of application messages, for example,
Network Ring Again.

CLOK D-channel clock type for signaling.

EXT Source of D-channel clock is external to DCHI card

(in this case, the DTI/PRI circuit card). Normally, EXT is
used for PRI/ISL.

Do not confuse this clock with the E1 span Clock

Controller found on the NTAK10/79. This clock is in
reference to the DCHI synchronous mode of operation.
Note: If directly connecting two DCHI ports without
modems, set “CLOK” to “EXT” on one side and “INT” on
the other.

LAPD YES (NO) Change LAPD parameters. Enter <cr> to leave timers
at default value. The following timers are prompted only
if LAPD is set to YES. The following can all be left at
default during initial set-up.

T23 1-(20)-31 Interface guard timer checks how long the interface
takes to respond. In units of 0.5 seconds (default
20 = 10 seconds).

T200 2-(3)-40 Retransmission timer in units of 0.5 seconds (default

3 = 1.5 seconds).

N200 1-(3)-8 Maximum number of retransmissions.

N201 4(260) Maximum number of octets in information field.

K 1-(7)-32 Maximum number of outstanding unacknowledged

frames (NAKS).

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LD 73 — Configuring the D-channel for ISL

Prompt Response Description

REQ NEW Add new data.

CHG Change existing data.

TYPE DDB Digital data block.

TRSH 0-15 Assign a threshold set or table.

RALM 1-(3)-128 Yellow alarm 24-hour threshold.

BIPC 1-(2)-128 24-hour bit rate violation threshold.

LFAC 1-(3)-128 24-hour loss of frame alignment threshold.

BIPV 1-(3)-4 Bit rate (bipolar violation and CRC) monitoring limits for
1-(2)-4 maintenance and out-of-service thresholds.

SRTK 1-(5)-24 Frame slip-tracking-monitoring limits (in hours).

1-(30)-3600

SRNT 1-(15)1024 Non-tracking slip-rate monitoring maintenance and

1-(3)-1024 out-of-service thresholds.

LFAL 1-(17)-10240 Loss of frame alignment monitoring limits.

1-(511)-10240

SRIM (1)-127 Slip rate improvement timer.

SRMM 1-(2)-127 Maximum number of times the slip rate exceeds the
maintenance limit.

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LD 15 — Enabling ISDN option (Part 1 of 2)

Prompt Response Description

REQ: NEW Add new data.

CHG Change existing data.

TYPE: NET Networking data.

CUST Customer number

0-99 Range for Large System, Call Server 1000E, and
Media Gateway 1000E

0-31 Range for Small System, CS 1000S system,

Media Gateway 1000B, and Media Gateway 1000T

ISDN YES Customer is equipped with ISDN.

PNI 1-32700 Customer private network identifier. This number

MUST be unique to this customer in the private
network. It is used to as part of the setup message for
feature operation such as Network Ring Again and
Network ACD.

HNPA NPA Telephone area code for this system. Sent as part of
setup message as calling line identification.

HNXX NXX Telephone local exchange code for this system. Sent
as part of setup message as calling line identification.

HLOC XXX Home location code (NARS).

LSC 1-9999 One to four digit Local Steering Code established in the
Coordinated Dialing Plan (CDP). The LSC prompt is
required for Calling Line I.D. and Network ACD.

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LD 15 — Enabling ISDN option (Part 2 of 2)

Prompt Response Description

AC2 Access Code 2. Enter call types (type of number) that

use access code 2. Multiple responses are permitted.
This prompt only appears on NARS equipped systems.
If a call type is not entered here, it is automatically
defaulted to access code 1.

NPA E.164 National.

NXX E.164 Subscriber.

INTL International.

SPN Special Number.

LOC Location Code.

LD 16 — Enabling ISL option on a per-route basis, assigning a D-channel for each

route (Part 1 of 2)

Prompt Response Description

REQ NEW Add new data.

CHG Change existing data.

TYPE RDB Route data block.

CUST xx Customer number as defined in LD 15.

ROUT Route number

0-511 Range for Large System and CS 1000E system.

0-127 Range for CS 1000M Small System, Meridian 1 Small

System, CS 1000S system, Media Gateway 1000B,
and Media Gateway 1000T.

TKTP TIE TIE Trunk route.

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LD 16 — Enabling ISL option on a per-route basis, assigning a D-channel for each

route (Part 2 of 2)

Prompt Response Description

DTRK YES/NO Enter YES if this is a Digital Trunk Interface (DTI or

PRI).

ISDN YES ISDN option.

MODE ISLD Route for ISL application.

DCHI XX DCHI port number in CFN which carries the D-channel

for this TIE Trunk route.

PNI 1-32700 Customer private network identifier. Must be the same

as the CDB PNI at the far-end.

IFC Interface type.

SL1 Interface type

CTYP <CR> Call Type. Enter the call type to be associated with the
outgoing route for direct dialing using the trunk access
code (instead of NARS access code). See the Software
Input/Output: System Messages (553-3001-411) for a
list of valid responses.

INAC YES Insert Access Code. Permits the NARS AC1 or AC2
access code to be re-inserted automatically on an
incoming ESN call.

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LD 14 — Assigning a channel identification to each trunk with the ISL option

Prompt Response Description

REQ NEW Add new data.

CHG Change existing data.

TYPE TIE TIE Trunk type.

TN l ch Loop and channel for digital trunks

RTMB Route number and Member number

0-511 1-4000 Range for Large System and CS 1000E system.

0-127 1-4000 Range for CS 1000M Small System, Meridian 1 Small

System, CS 1000S system, Media Gateway 1000B,
and Media Gateway 1000T.

CHID 1-192 Channel identifier for ISL channels (remove with Xnn)
must be coordinated with far-end (no default value).

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Implement shared mode

The same DTI/PRI software implementation sequence can be used as for
Dedicated mode with the following exceptions:
LD 17

Prompt Response Description

USR SHA D-channel for ISL in “shared” mode, used for both
ISDN PRI and ISL.

ISLM 1-192 Number of ISL B-channel (trunks) controlled by the

D-channel (no default value).

LD 16

Prompt Response Description

IFC SL1 Interface type must be SL1 (this is the only type
supported for ISL).

MODE ISLD TIE route used for ISL members.

DCHI 0-15 DCHI port number.

LD 14

Prompt Response Description

CHID 1-192 Channel identifier for ISL channels. Must be coordinated with
the far-end.

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332

Page 301 of 396

2.0 Mb DTI implementation

Contents
This section contains information on the following topics:
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301
NTAK10 2.0 Mb DTI card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
Install DTI hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 303
DTI software implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 308

Overview
This chapter provides the information required to install the 2.0 Mb Digital
Trunk Interface (DTI) card in a system. It includes information for:
• hardware installation
• software implementation

Hardware requirements
Hardware requirements for 2.0 Mb DTI are as follows:
• 2.0 Mb DTI Circuit card - NTAK10
(a Clock Controller is incorporated into the circuit card)
• CEPT Cable – NTBK05DA (120 ¾ twisted pair – 6.15 m length)
• CEPT Cable – NTBK05CA (75 ¾ coaxial – 6.15 m length)

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Figure 82
2.0 Mb DTI cabling

NTBKO5DA
120½ Twisted Pair (6.15 m)
Small System

PRI2 To 2.048
or Mpbs Carrier
DTI2 Cross Connect

NTBKO5CA
75½ Coax Pair (6.15 m)
553-AAA1071

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NTAK10 2.0 Mb DTI card

The 2.0 Mb DTI card provides the physical interface for the digital E-1 carrier
on the system. The card includes an on-board clock controller and is installed
in slots 1 through 9 in the Option 11C Cabinet. On IP Expansion cabinets, it
is placed in slots 11-19, 21-29, 31-39, 41-49 of the first, second, third, and
fourth expansion cabinets, respectively.

For CS 1000S, it is placed in slots 11-14, 21-24, 31-34, 41-44 of the first,
second, third and fourth MG 1000S, respectively.

The NTAK10 2.0 Mb DTI card is also used for ISL shared mode applications.

For information on the NTAK10 faceplate LEDs, refer to ISDN Primary Rate
Interface: Maintenance (553-3001-517).

Install DTI hardware

The NTAK10 circuit card is installed in card slot 1-9 in the Option 11C
Cabinet. On IP Expansion cabinets, it is installed in slots 11-19, 21-29, 31-39,
41-49 of the first, second, third, and fourth expansion cabinets, respectively.

For CS 1000S, it is placed in slots 11-14, 21-24, 31-34, 41-44 of the first,
second, third and fourth MG 1000S, respectively.

The NTAK10 is installed only in the MG 1000S. It is not supported in the

MG 1000S Expansion. Up to four digital trunk cards are supported in each
MG 1000S. The NTAK10 card is installed in Slots 1, 2, 3 and 4 of the
MG 1000S.

IMPORTANT!
Each MG 1000S that has a digital trunk must have a clock controller set
to an external reference clock.

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Inspect the NTAK10 circuit card

Inspect the circuit card before installing it in the Option 11C Cabinet or
MG 1000S:
• Locate the NTAK10 2.0 Mb circuit card and carefully remove it from its
packaging.
• Inspect the circuit card for any visible damage that occurred during
shipping.

Set the switches

The NTAK10 incorporates four surface mounted dip switches. The following
tables provide information on the various settings and related functions of
these switches.

Note: The ON position for all the switches is toward the bottom of the
card. This is indicated by a white dot printed on the board adjacent to the
bottom left corner of each individual switch.

Set the switches on the circuit card according to the requirements of your
installation.

Switch S1 — Clock Controller (CC) configuration

This switch enables and disables the on-board Clock Controller (CC).

Table 84
Switch S1

Switch Off (Up) On (Down)

S1-1 Spare Spare

S1-2 Clock Controller Clock Controller

Enabled Disabled

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Switch S2 — Carrier impedance configuration

This switch sets the carrier impedance to either 120¾ or 75¾. Twisted pair
cable is usually associated with 120¾. Coaxial cable is usually associated
with the 75¾ setting.

Table 85
Switch S2

Switch Off (Up) On (Down)

S2-1 120¾ 75¾

S2-2 75¾ 120¾

Switch S3 — Mode of operation

This switch selects the operational mode for the NTAK10. The NTAK10
supports firmware that allows it to operate in the standard CEPT format mode
or the modified CEPT format used in France.

Table 86
Switch S3

Switch Off (Up) On (Down)

S3-1 Non-French Firmware French Firmware

S3-2 Spare Spare

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Switch S4 — Carrier shield grounding

This switch supports selective shield grounding of the Tx and/or Rx pairs of
the carrier cable. Closing the switch (down position) applies Frame Ground
(FGND) to the coaxial carrier cable shield, creating a 75¾ unbalanced
configuration. The Tx and Rx pairs are referenced with respect to the 2.0 Mb
DTI card that is, Rx is carrier received from the far-end device.

Table 87
Switch S4

Switch Off (Up) On (Down)

S4-1 Receive Shield Frame Ground on

Unconnected Receive Shield

S4-2 Transmit Shield Frame Ground on

Unconnected Transmit Shield

Note: The usual method is to ground the outer conductor of the receive
coax signal.

Insert the NTAK10

Install the circuit card in slots 1-9 in the Option 11C Cabinet, or in slots 11-19,
21-29, 31-39, 41-49 of the first, second, third, and fourth IP expansion
cabinets, respectively.

For CS 1000S, it is placed in logical slots 11-14, 21-24, 31-34, 41-44 of the
first, second, third and fourth MG 1000S, respectively.

Note: For CS 1000S, physical card slots are numbered 1-4 on the first,
second, third and fourth MG 1000S.

Secure the circuit card in the cabinet or MG 1000S by locking the lock latch
assemblies.

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Procedure 39
Connecting the cables
1 In the cabling area, located directly below the card cage, remove the
retaining bar that secures the MDF cables. Connect the NTBK05DA/CA
interface cable to the 50-pin Amphenol connector below the card slot
holding the NTAK10 2.0 Mb DTI circuit card. Re-install the retaining bar
to secure the cable(s).
2 Terminate the NTBK05DA/CA carrier cable as required.

End of Procedure

NTBK05DA pinouts
The pinouts for the NTBK05DA cable are as follows:

Table 88
NTBK05DA pinouts

From: To:
50-pin MDF 9-pin
connector connector Color Signal

pin 23 pin 6 Black R0

pin 48 pin 7 White T0

pin 50 pin 9 Bare R0/T0 FGND

pin 24 pin 2 Black R1

pin 49 pin 3 Red T1

pin 25 pin 5 Bare R1/T1 FGND

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NTBK05CA pinouts
The pinouts for the NTBK05CA cable are as follows:

Table 89
NTBK05CA pinouts

From: To: To: To:

50-pin MDF Transmit coax Receive coax 50-pin MDF
connector connector connector connector

pin 23 Inner conductor — —

pin 48 outer conductor — —

pin 24 — Inner conductor —

pin 49 — outer conductor —

pin 21 — — pin 49

pin 46 — — pin 48

DTI software implementation

The following procedure describes the process required to program basic
2.0 Mb DTI on the system main and IP expansion cabinets or MG 1000S.

Task summary list

The following is a summary of the tasks in this section:
3 LD 17 — Adding a 2.0 Mb DTI card
4 LD 73 — Defining the 2.0 Mb DTI ABCD signaling bit tables
5 LD 73 — Defining the 2.0 Mb DTI pad tables
6 LD 73 — Defining the 2.0 Mb DTI timers
7 LD 73 — Defining the 2.0 Mb DTI system timers

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8 LD 16 — Configuring the service routes

9 LD 14 — Defining the associated list of service trunks

LD 17 — Adding a 2.0 Mb DTI card

Prompt Response Description

REQ CHG Change.

TYPE CEQU Common equipment.

...

DTI2 xx Enter a card slot number for 2.0 Mb DTI.

LD 73 — Defining the 2.0 Mb DTI ABCD signaling bit tables (Part 1 of 8)

Prompt Response Description

REQ NEW Add or change Digital Trunk Interface data block.

CHG

TYPE DTI2 2.0 Mb/s DTI data block.

FEAT ABCD ABCD bit signaling category.

SICA 2-16 Signaling category.

...

DFLT (1)-16 Default signaling category used for default values

JDMI defaults to 16 with <CR>3.

Incoming/Outgoing Calls:

IDLE(S) abcd (Send) idle signal bits.

IDLE(R) abcd (Receive) idle signal bits.

FALT(S) abcd (Send) bits. 2.0 Mb DTI out-of-service.

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LD 73 — Defining the 2.0 Mb DTI ABCD signaling bit tables (Part 2 of 8)

Prompt Response Description

N If FALT (send) signal not required.

FALT(R) abcd (Receive) bits. 2.0 Mb DTI out-of-service.

N If FALT (receive) signal not required.

Incoming Calls:

SEZ(R) abcd Seize signal (send or receive) for voice or data calls from or
to a non-SL-1.

SEZD(R) abcd Seize signal (send or receive) for data calls between SL-1s.

N If SEZD(R) signal not required.

SEZV(R) abcd Seize signal (send or receive) for voice calls.

N If SEZV(R) signals not required.

P CALL(R) abcd (Receive) signal sent during seize by an incoming CO trunk.

TIME ON OFF Length of pulse time on, and time off.

(default 2 seconds on, 8 seconds off)

SEZA(S) abcd Seize signal acknowledgment (send).

N If SEZA(S) signal not required.

P WNKS(S) abcd Wink start (corresponds to a pulsed seize acknowledgment).

Prompted when SEZA(S) not required.

N If WNKS(S) signal not required.

TIME 10-(220)-630 Time for WNKS(S) signal in milliseconds.

P DIGT(R) abcd (Receive) decadic pulses.

N If DIGT(R) not required.

NRCV(S) abcd Number received signal (send).

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LD 73 — Defining the 2.0 Mb DTI ABCD signaling bit tables (Part 3 of 8)

Prompt Response Description

N If NRCV(S) signal not required.

P EOSF(S) abcd End of selection free (send).

N If EOSF(S) not required.

TIME (100)-150 Time for EOSF(S) in milliseconds.

P EOSB(S) abcd End of selection busy (send).

N If EOSB(S) not required.

TIME (100)-150 Time for EOSB(S) in milliseconds.

P OPCA(R) abcd Operator calling time (receive) signal.

N If OPCA(R) not required.

TIME 64-(128)-192 Time of OPCA(R) pulse in milliseconds.

REPT (1)-5 Number of OPCA(R) pulses.

CONN(S) abcd Connect send.

CONN(R) abcd Connect receive.

P RRC(S) abcd Register recall (send) signal. Activated by Malicious Call

Trace.

N If RRC(S) not required.

TIME 10-(100)-150 Time of RRC(S) signal in milliseconds.

P BURS(S) abcd Bring up receiver (send). Uses switch-hook flash timer for
timer.

N If BURS(S) not required.

P BURS(R) abcd Bring up receiver (receive). Uses switch-hook flash timer for
timer.

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LD 73 — Defining the 2.0 Mb DTI ABCD signaling bit tables (Part 4 of 8)

Prompt Response Description

N If BURS(R) not required.

TIME 64-(128)-192 Length of BURS(R) pulse in milliseconds.

P CAS(S) abcd CAS Flash. Same timing as analogue trunks.

Note: Prompted for JDMI only. Operational only if CASM

package equipped.

N If CAS(S) not required.

CLRB(S) abcd Clearback (send) signal.

N If CLRB(S) not required (IDLE signal is used).

P RCTL(S) abcd Release control (send) signal.

N If RCTL(S) not required.

Note: Prompted only when CLRB is unused or is defined the

same as IDLE.

TIME 100-(150)-300 Time value is stored in multiples of 10 milliseconds.

R RCOD(S) abcd Release Control Originating party Disconnect. This signal is

another pulsed SL-1 signal sent on incoming trunks when the
originating party disconnects first.

N If RCOD(S) not required.

TIME 150 Timer value in milliseconds is fixed.

P OPRS(R) abcd Operator (receive) manual recall signal.

N If OPRS(R) not required.

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LD 73 — Defining the 2.0 Mb DTI ABCD signaling bit tables (Part 5 of 8)

Prompt Response Description

TIME xxx yyy Minimum and maximum time range for OPRS(R) in
milliseconds.

xxx = 8-(48)-2040
yyy = xxx-(128)-2040

P NXFR(S) abcd Network transfer signal (send) pulse. Pulse time not variable.

N If NXFR(S) not required.

P ESNW(S) abcd ESN wink signal (send) pulse. Pulse time not variable.

N If ESNW(S) not required.

P CAS(S) abcd Centralized Attendant signal (send) pulse. Pulse time not
variable.

Note: Prompted for 2.0 Mb DTI only.

N If CAS(S) not required.

CLRF(R) abcd Clear forward (receive).

N If CLRF(R) not required.

SOSI abcd Special operator signal defined.

(N) Undefined. Prompted when OPRC = N.

Outgoing Calls:

SEZA(S) abcd Seize acknowledgement

SEZD(S) abcd Seize acknowledgement and (send) data signal.

N If SEZD(S) not required.

SEZV(S) abcd Seize acknowledgement and (send) voice signal. Only

recommended for Meridian to M-1 applications.

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LD 73 — Defining the 2.0 Mb DTI ABCD signaling bit tables (Part 6 of 8)

Prompt Response Description

TIME xxx yyy Minimum and maximum time range for OPRS(R) in
milliseconds.

xxx = 8-(48)-2040
yyy = xxx-(128)-2040

N If SEZV(S) not required.

SEZA(R) abcd Seize acknowledgment (receive) signal.

N If SEZA(R) not required.

P WNKS(R) abcd Wink start pulsed seize acknowledgment (receive) signal.

N If P WNKS(R) not required.

TIME 20-(140)-500, Minimum and maximum length of WNKS(R) pulse in

20-(290)-500 milliseconds.

P EOS(R) abcd End of selection (receive) signal.

N If EOS(R) not required.

TIME (64)-320 Length of EOS(R) pulse stored in multiples of 8 milliseconds.

64-(256)-320

CONN(S) abcd Connect send.

CONN(R) abcd Connect receive.

P OPRC(R) abcd Operator recall signal for special services. minimum three
pulses of 160 milliseconds each.

N If OPRC(R) not required.

P BURS(S) abcd Bring up receiver (send) for L1 networking.

N If BURS(S) not required.

P BURS(R) abcd Bring up receiver (receive) for L1 networking.

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LD 73 — Defining the 2.0 Mb DTI ABCD signaling bit tables (Part 7 of 8)

Prompt Response Description

N If BURS(R) not required.

TIME 64-(128)-192 Length of BURS(R) pulse in milliseconds.

N If SEZV(S) not required.

P CAS(R) abcd CAS Flash. Same timing as analogue trunks. Prompted for
JDMI only. Operational only if CASR package equipped.

N If CAS(R) not required.

CLRB(R) abcd Clear back.

N If CLRB(R) not required, when IDLE is used.

P RCTL(R) abcd Release control. Prompted only when CLRB is unused or is

defined the same as IDLE.

N If RCTL(R) not required.

TIME 96-(128)-320 Time value stored in multiples of 8 milliseconds.

96-(256)-320

P NXFR(R) abcd Network transfer.

N If not required.

P ESNW(R) abcd ESN wink signal.

N If ESNW(R) not required.

P CAS(R) abcd Centralized attendant service signal.

2.0 Mb DTI only 3.

N If CAS(R) not required.

CLRF(S) abcd Clear forward (send).

N If CLRF(S) not required.

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LD 73 — Defining the 2.0 Mb DTI ABCD signaling bit tables (Part 8 of 8)

Prompt Response Description

TIME (0) 800 milliseconds.

Note: Prompted when the abcd bits entered in response to

the CLFR(S) prompt are different from the abcd bits of the
IDLE signal.

SOSO abcd (N) Special operator signal defined (undefined).

Note: Prompted when OPRC = N.

LD 73 — Defining the 2.0 Mb DTI pad tables (Part 1 of 4)

Prompt Response Description

REQ NEW Add or change Digital Trunk Interface data block.

CHG

TYPE DTI2 2.0 Mb DTI.

FEAT PAD Request the digital pad feature.

PDCA 1-16 PAD Category table.

If one channel is using the specified table, then the command

is aborted.

Cannot modify or delete Table 1.

TNLS YES (NO) TN List. This is for the print command only.

A YES response means that a list of the trunk TNs using the
requested PAD category tables are printed after the table.

DFLT (1)-16 For NEW only. The table is used for default values.

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LD 73 — Defining the 2.0 Mb DTI pad tables (Part 2 of 4)

Prompt Response Description

The following prompts define the pad levels.

The receiving pad code is r and the transmission pad code is t. These entries have the range
0-15. The pad values (in decibels) relating to these codes are shown after this table.

ONP r t On-premises extension.

OPX r t Off-premises extension.

DTT r t Digital TIE trunks.

SDTT r t Digital Satellite TIE trunks.

NTC r t Nontransmission compensated.

TRC r t Transmission compensated.

DCO r t Digital COT, FEX, WAT, and DID trunks.

VNL r t Via Net Loss.

DTO r t 2.0 Mb DTI digital TOLL office trunks.

ACO r t AnalogCO or WATS trunks.

AFX r t Analog FEX trunks.

ADD r t Analog DID trunks.

SATT r t Analog satellite TIE trunks.

TNLS YES (NO) TN List. This is for the print command only.

A YES response means that a list of the trunk TNs using the
requested PAD category tables are printed after the table.

DFLT (1)-16 For NEW only. The table is used for default values.

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LD 73 — Defining the 2.0 Mb DTI pad tables (Part 3 of 4)

Prompt Response Description

The following prompts define the pad levels.

The receiving pad code is r and the transmission pad code is t. These entries have the range
0-15. The pad values (in decibels) relating to these codes are shown after this table.

ONP r t On-premises extension.

OPX r t Off-premises extension.

TNLS YES (NO) TN List. This is for the print command only.

A YES response means that a list of the trunk TNs using the
requested PAD category tables are printed after the table.

DFLT (1)-16 For NEW only. The table is used for default values.

The following prompts define the pad levels.

The receiving pad code is r and the transmission pad code is t. These entries have the range
0-15. The pad values (in decibels) relating to these codes are shown after this table.

ONP r t On-premises extension.

OPX r t Off-premises extension.

DTT r t Digital TIE trunks.

SDTT r t Digital Satellite TIE trunks.

NTC r t Nontransmission compensated.

TRC r t Transmission compensated.

DCO r t digital COT, FEX, WAT, and DID trunks.

VNL r t Via Net Loss.

DTO r t 2.0 Mb DTI digital TOLL office trunks.

ACO r t Analog CO or WATS trunks.

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LD 73 — Defining the 2.0 Mb DTI pad tables (Part 4 of 4)

Prompt Response Description

AFX r t Analog FEX trunks.

ADD r t Analog DID trunks.

SATT r t Analog satellite TIE trunks.

ATO r t Analog TOLL office trunks.

DTI2 r t 2.0 Mb DTI trunk

(Prompted only if the 1.5/2.0 Mb Gateway feature is equipped
and TYPE=DTI2).

XUT r t Analog CO trunk

(Prompted only if the 1.5/2.0 Mb Gateway feature is equipped
and TYPE=DTI2).

XEM r t Analog TIE trunk

(Prompted only if the 1.5/2.0 Mb Gateway feature is equipped
and TYPE=DTI2).

The following pads are available for the 2.0 Mb DTI card. Their respective
codes are also given. Positive dB represents loss and negative dB represents
gain.

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Table 90
2.0 Mb DTI pads

code 0 1 2 3 4 5 6 7

value (dB) 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0

code 8 9 10 11 12 13 14 15

value (dB) +8.0 +9.0 +10.0 +11.0 +12.0 +13.0 +14.0 -1

code 16 17 18 19 20 21 22 23

value (dB) -2 -3 -4 -5 -6 -7 -8 -9

code 24 25 26

value (dB) -10 idle +0.6

LD 73 — Defining the 2.0 Mb DTI timers (Part 1 of 2)

Prompt Response Description

REQ NEW Add or Change Digital Trunk Interface data block

CHG

TYPE DTI2 2.0 Mb DTI

FEAT LPTI Set the timers used for a 2.0 Mb DTI

LOOP xx 2.0 Mb DTI card slot number.

xx = 1-9 in Main Cabinet.

xx = 11-19, 21-29, 31-39, 41-49 in IP expansion cabinets 1-4,
respectively.

xx = 11-14, 21-24, 31-34, 41-44 of the first, second, third and

fourth MG 1000S, respectively.

P DIGT (S) abcd Digit pulse timing from TDS (Bits P, X or U are selectable)

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LD 73 — Defining the 2.0 Mb DTI timers (Part 2 of 2)

Prompt Response Description

N If DIGT(S) signal not required

P METR(R) abcd Metering (receive). Bits P, X or U. Only two P bits allowed.

COT and DID trunks only.

Note: PPM package must be enabled.

N If METR(R) signal not required

EDGE 0 PPM bit counted when changed from 1 to 0.

1 PPM bit counted when changed from 0 to 1.

TIME 40-(240)-480 Maximum time METR signal is in milliseconds.

SASU 0-(1920)-8064 Seize acknowledge supervision period in milliseconds.

2.0 Mb DTI default = 1920

MFAO YES (NO) DTI card will or will not set bit 3 of timeslot 0 if loss of
<CR> Multiframe Alignment Signal (MFAS) occurs.
2.0 Mb DTI default = NO

<cr> = no change is required

SZNI YES (NO) PSTN incoming seizure during lockout of MFAS and far-end
fault states allowed (denied)

MFF CRC Multiframe format - Cyclic Redundancy Check (CRC 4)

(AFF) Alternative Frame Format

Note: Prompted for Small Systems and CS 1000S only.

The following prompts and associated responses define the grade of service
timers for the DTI card. Group I problems are treated individually. They are
bipolar violations, bit error rate (frame alignment) slips, and CRC-4 errors.

Group II problems are treated as a group. They are bit 3 of TS0 (far-end out
of service), bit 6 of TS16 (far-end lost multiframe alignment), AIS (alarm
indication signal), loss of frame alignment, and loss of multiframe alignment.

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Responses are interpreted as follows:

• mt = Maintenance threshold time.
• ct = New call suppression (hardware service removal) threshold time.
• ot = Out of service threshold time.
• dt = No new data calls suppression threshold time.

Each of the response times are expressed as follows:

• nnnY = time in milliseconds where nnnn = 20-5000 (input to nearest 20
milliseconds.)
• nnnS = time in seconds where nnn = 1-240

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• nnnM = time in minutes where nnn = 1-240

• nnH = time in hours where nn = 1-24

LD 73 — Defining the grade of service timers for the DTI card (Part 1 of 2)

Prompt Response Description

CRC NC mt dt ct ot Cyclic redundancy check error counts.

NC = Error count values are in the range 1-255.
mt = Maintenance threshold time (MNT).
dt = No new data calls threshold time (NNDC).
ct = No new calls threshold time (NNC).
ot = Out of service threshold time (OOS).

Note: The following requirements must be met for input.

mt = Maintenance threshold is equal to or greater than dt.
dt = Data calls threshold is equal to or greater than ct.
ct = Calls threshold is equal to or greater than ot.

BPV NB mt dt ct ot Bipolar violation error counts.

NB = Error count values are in the range 1-255.
mt = Maintenance threshold time (MNT).
dt = No new data calls threshold time (NNDC).
ct = No new calls threshold time (NNC).
ot = Out of service threshold time (OOS).

Note: The following requirements must be met for this input:

mt = >dt = >ct = >ot.

FAP NF mt dt ct ot Frame alignment problem thresholds.

NF = Error count values are in the range 1-255.
mt = Maintenance threshold time (MNT).
dt = No new data calls threshold time (NNDC).
ct = No new calls threshold time (NNC).
ot = Out of service threshold time

Note: The following requirements must be met for this input:

mt = >dt = >ct = >ot.

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LD 73 — Defining the grade of service timers for the DTI card (Part 2 of 2)

Prompt Response Description

SLP NS mt dt ct ot Maintenance threshold slip count.

NS = Error count values are in the range 1-255.
mt = Maintenance threshold time (MNT).
dt = No new data calls threshold time (NNDC).
ct = No new calls threshold time (NNC).
ot = Out of service threshold time (OOS).

GP2 T2 mt dt ct ot Group 2 error thresholds.

This is the maximum amount of time that can occur before
software checks the associated thresholds of 120 to 32640
msec and rounds it to the closest multiple of 128 msec. T2
error count values are in the range 1-(20)-255.
NC = Error count values are in the range 1-255.
mt = Maintenance threshold time (MNT).
dt = No new data calls threshold time (NNDC).
ct = No new calls threshold time (NNC).
ot = Out of service threshold time (OOS).

Note: The following requirements must be met for this input:

mt = >dt = >ct = >ot.

FRFW YES (NO) This 2.0 Mb DTI card is (is not) equipped with special
Firmware for France.

LD 73 — Defining the 2.0 Mb DTI system timers (Part 1 of 3)

Prompt Response Description

REQ NEW Add or Change Digital Trunk Interface data block.

CHG

TYPE DTI2 2.0 Mb DTI.

FEAT SYTI Change the switch timers and counters for 2.0 Mb DTI.
There is only one such block per switch.

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LD 73 — Defining the 2.0 Mb DTI system timers (Part 2 of 3)

Prompt Response Description

MAND 0-(15)-1440 Maintenance guard time in minutes.

NCSD 0-(15)-1440 New call suppression guard time in minutes and seconds.
1S-59S

OSGD 0-(15)-1440 Out-of-service guard time in minutes.

OOSC 0-(5)-127 Out-of-service occurrences since midnight (DTI disabled).

PERS 0-(100)-254 Persistence timer in milliseconds for far-end problems.

DBNC (10)-32 Debounce timer in milliseconds.

CCO xx Card slot number for Clock Controller 0.

<CR> No change for defaults.

X To remove clock controller data.

PREF CCO xx Card number of PRI/DTI/SILC containing the primary clock

reference for the main cabinet

SREF CCO xx Card number of PRI/DTI/SILC containing the primary clock

reference for the main cabinet

CC1 xx Card number for Clock Controller 1.

PREF CC1 xx Primary Reference DTI/PRI loop for Clock controller one.

SREF CC1 xx Primary Reference DTI/PRI loop for Clock controller one.

CC2 xx Card number for Clock Controller 2.

PREF CC2 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

SREF CC2 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

CC3 xx Card number for Clock Controller 3.

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LD 73 — Defining the 2.0 Mb DTI system timers (Part 3 of 3)

Prompt Response Description

PREF CC3 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

SREF CC3 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

CC4 xx Card number for Clock Controller 4.

PREF CC4 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

CCGD 0-(15)-1440 Clock controller free run guard time in minutes.

CCAR 0-(15) Clock controller audit rate. The time, in minutes, between
normal CC audits. Only programmable on units equipped with
2-Mb DTI.

Note 1: The clock controller prompts only appear for clocks

which are valid for the machine type being configured. The
prompts only appear if the system is in a valid state for the
definition of the 2.0 Mb DTI clock controller data that is, the
DTI clock references must be unused or in a free-run mode.

Note 2: Before programming clock controller references, the

QPC775 clock controller card(s) must be plugged in, and the
switches on the system's QPC441 3 Port Extender must be
appropriately set. Otherwise, the PREF and SREF prompts
are not given.

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LD 16 — Configuring the service routes (Part 1 of 3)

Prompt Response Description

REQ NEW Add or Change Route data block.

CHG

TYPE RDB Route data block.

CUST xx Customer number, as defined in LD 15

ROUT Route number

0-511 Range for Large System and CS 1000E system.

0-127 Range for CS 1000M Small System, Meridian 1 Small

System, CS 1000S system, Media Gateway 1000B, and
Media Gateway 1000T.

TKTP Service routes allowed with ISDN.

TIE TIE trunk route.

COT Central office trunk.
DID Direct Inward Dial trunk.

RCLS (EXT) Class marked route as Internal or External.

INT

DTRK Digital trunk route.

(NO) Analog.
YES Digital.

DGTP DTI2 Select a digital trunk type of 2.0 Mb DTI.

...

NCNA YES (NO) Network Call Name is (is not) allowed.

NCRD YES (NO) Network Call Redirection. Allows network call redirection
messages to be sent (or blocks messages if NCRD=no).

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LD 16 — Configuring the service routes (Part 2 of 3)

Prompt Response Description

PTYP Port type at far-end:

Analog TIE trunk routes:

(ATT) Analog TIE trunk.
AST Analogue satellite system TIE trunk or ESN satellite
Meridian SL-1 TIE trunk.
AOT Analogue TIE trunk, used instead of ATT whenever the
system has one or more digital satellite trunk routes (DST) to
any digital satellite system which includes OPX sets.

Digital TIE trunk routes:

(DTT) Digital TIE trunk.
DCT Combination digital TIE trunk.
DST Digital satellite system TIE trunk.

AUTO YES (NO) Auto-terminate must be NO if response to DSEL is VOD.

ICOG IAO Incoming and outgoing trunk.

ICT Incoming trunk.
OGT Outgoing trunk.

SRCH (LIN) Linear search, or round-robin search, used for outgoing

RRB trunks.

ACOD xxxx Trunk route access code.

TARG 1-15 Trunk access restriction group for routes.

OABS 0-9 Outgoing digit(s) to be absorbed.

INST (0)-999 Digits to be inserted.

CNTL (NO) YES Changes to controls or timers.

NEDC Near-end disconnect control.

ETH Either end control.

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LD 16 — Configuring the service routes (Part 3 of 3)

Prompt Response Description

ORG Originating end control. Default for TIE, ATVN, DID, and
CCSA trunk types.

FEDC Far-end disconnect control.

ETH Either end.

FEC Far-end.

JNT Joint.

(ORG) Originating end.

DLTN YES (NO) Dial tone on originating calls.

TIMER (30)-240 Network Ring Again duration timer time is in minutes.

Note: Package 148, Advanced ISDN Features, is required.

LD 14 — Defining the associated list of service trunks (Part 1 of 3)

Prompt Response Description

REQ NEW Add or Change Trunk data block.

CHG

TYPE TIE TIE trunk route.

COT Central Office trunk data block.
DID Direct Inward Dial trunk data block.

CHID 1-382 Channel ID for this trunk.

TN l ch Loop and channel for digital trunks

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LD 14 — Defining the associated list of service trunks (Part 2 of 3)

Prompt Response Description

TOTN sc New card slot and channel, where:

• s = 1-9 DTI2 card slot number (Option 11C main cabinet)

s = 11-19 DTI2 card slot number (IP expansion cabinet 1)
s = 21-29 DTI2 card slot number (IP expansion cabinet 2)
s = 31-39 DTI2 card slot number (IP expansion cabinet 3)
s = 41-49 DTI2 card slot number (IP expansion cabinet 4)

• For CS 1000S:
s = 11-14 DTI2 card slot number (MG 1000S 1)
s = 21-24 DTI2 card slot number (MG 1000S 2)
s = 31-34 DTI2 card slot number (MG 1000S 3)
s = 41-44 DTI2 card slot number (MG 1000S 4)

• c = 1-30, 2.0 Mb DTI channel

PDCA (1) - 16 Pad Category Number. This prompt is given if the card is a
2.0 Mb DTI card, or if the card is a 2.0 Mb DTI card and the
1.5/2.0 Mb Gateway feature is equipped. For 2 to 16, the pad
category used must already be defined in LD 73.

PCML (MU) A System PCM law.

Prompted if the card is 2.0 Mb DTI, or if the card is a 2.0 Mb

DTI card and the 2.0 Mb Gateway feature is equipped. MU,
the default, was entered in the PCML prompt in LD 17.

CUST xx Customer number, as defined LD 15

NCOS Network class-of-service group number:

0-3 CDP
0-7 BARS/NFCR
0-15 NARS

RTMB Route number and Member number

0-511 1-4000 Range for Large System and CS 1000E system.

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LD 14 — Defining the associated list of service trunks (Part 3 of 3)

Prompt Response Description

0-127 1-4000 Range for CS 1000M Small System, Meridian 1 Small

System, CS 1000S system, Media Gateway 1000B, and
Media Gateway 1000T.

NITE xxxx Night-service directory number.

TGAR (0)-15 Trunk group access restriction.

CLS Class-of-service restrictions.

Note: If DIP option is selected, a new SLCA table must be
defined in LD 73.

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370

Page 333 of 396

2.0 Mb PRI implementation

Contents
This section contains information on the following topics:
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333
Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334
Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
Install the NTAK79 PRI card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 339
Install the NTBK50 PRI card . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 346
PRI software implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 356

Overview
This chapter provides the information required to install 2.0 Mb PRI on a
system. It includes information about hardware installation and software
implementation.

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Hardware requirements

Circuit cards
To implement 2.0 Mb PRI, an NTAK79 or an NTBK50 PRI card plus
associated daughterboards is required.

Table 91
2.0 Mb PRI hardware requirement

Circuit card Description

NTBK50 2.0 Mb PRI circuit card.

Supports the NTAK20 clock controller

daughterboard and a D-channel handler
interface daughterboard (NTAK93 DCHI or
NTBK51 DDCH).

NTAK79 2.0 Mb PRI circuit card.

Supports an on-board clock controller and an

on-board D-channel handler interface.

NTAK20 Clock-controller daughterboard. The system

supports only one active clock controller per
system or IP expansion cabinet.

Note: Every cabinet or MG 1000S that

contains a digital trunk must contain a clock
controller.
Connects to the NTBK50 PRI card.

NTAK93 D-channel-handler interface (DCHI)

daughterboard.

Connects to the NTBK50 PRI card.

NTBK51 Downloadable D-channel daughterboard

(DDCH).

Connects to the NTBK50 PRI card.

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Cables
One of the following cables is required for a PRI connection:
• CEPT Cable - NTBK05DA (120 ¾ twisted pair—6.15 m length), or
• CEPT Cable - NTBK05CA (75 ¾ coaxial—6.15 m length)

Hardware description

2.0 Mb PRI cards

Two PRI cards are available on the system:
• NTAK79 2.0 Mb PRI card
• NTBK50 2.0 Mb PRI card

The difference between the two PRI cards is that the NTBK50, when
equipped with the NTBK51 D-channel daughterboard, can download
software onto the card. This feature is based on the MSDL platform and
essentially replaces the D-channel circuit on the NTAK79 PRI card. (The
NTAK79 PRI card does not support the NTBK51 Downloadable D-channel
handler daughterboard.)

A second difference between the NTAK79 and NTBK50 2.0 Mb PRI cards is
that the NTAK79 has an on-board clock controller while the NTBK50
supports the NTAK20 clock controller daughterboard.

Note: If the NTAK93 D-channel daughterboard is attached to the

NTBK50 PRI card instead of the NTBK51 Downloadable D-channel
daughterboard, the NTBK50 PRI card functions in the same manner as
the NTAK79 PRI card.

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NTAK79 2.0 Mb PRI circuit card

The 2.0 Mb Primary Rate Interface card provides the physical interface for
the digital E-1 carrier on the system. The card includes an on-board clock
controller and on-board D-channel handler. It is installed in slots 1-9 in the
main cabinet. On IP Expansion cabinets, it is installed in slots 11-19, 21-29,
31-39, 41-49 of the first, second, third, and fourth expansion cabinets,
respectively.

For CS 1000S, it is installed in slots 11-14, 21-24, 31-34, 41-44 of the first,
second, third and fourth MG 1000S, respectively.

For information on the NTAK79 faceplate LEDs, refer to ISDN Primary Rate
Interface: Maintenance (553-3001-517).

NTBK50 2.0 Mb PRI circuit card

The 2.0 Mb Primary Rate Interface card provides the physical interface for
the digital E-1 carrier on the system. The card is installed in slots 1-9 in the
main cabinet or MG 1000S. On IP Expansion cabinets, it is installed in slots
11-19, 21-29, 31-39, 41-49 of the first, second, third, and fourth expansion
cabinets, respectively.

For CS 1000S, it is installed in slots 11-14, 21-24, 31-34, 41-44 of the first,
second, third and fourth MG 1000S, respectively.

Note: For CS 1000S, the NTAK79 card and NTBK50 cards are installed
only in the MG 1000S. They are not supported in the MG 1000S
Expansion.

IMPORTANT!
Each MG 1000S that has a digital trunk must have a clock controller set
to an external reference clock.

Note: Clocking slips can occur between MG 1000S systems that are
clocked from different COs, if the COs are not synchronized. The slips
can degrade voice quality.

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The NTBK50 supports the following clock controller and D-channel handler
daughterboards:
• NTAK20 clock controller daughterboard
• NTAK93 D-channel handler daughterboard, or NTBK51 Downloadable
D-channel daughterboard.

If the NTAK93 D-channel daughterboard is attached, the NTBK50 PRI card

functions in the same manner as the NTAK79 PRI card. If the NTBK51
D-channel daughterboard is attached, software is downloaded to the card
instead of residing in a D-channel circuit.

For information on the NTBK50 faceplate LEDs, refer to ISDN Primary Rate
Interface: Maintenance (553-3001-517).

NTAK20 Clock Controller (CC) daughterboard

The NTAK20 Clock Controller daughterboard is used with the NTBK50
2.0 Mb PRI card. The NTAK79 PRI card has an on-board clock controller.

Digital Trunking requires synchronized clocking so that a shift in one clock

source results in an equivalent shift of the same size and direction in all parts
of the network. On systems, synchronization is accomplished with the
NTAK20 clock controller circuit card.

IMPORTANT!
Every Small System cabinet or MG 1000S that contains a digital trunk
must contain a clock controller. If a Small System is equipped with digital
trunks, Nortel recommends that at least one digital trunk is placed in the
Small System main cabinet.

The Clock Controller circuitry synchronizes the system to an external

reference clock, and generates and distributes the clock to the system. The
system can function either as a slave to an external clock or as a clocking
master. The NTAK20AB version of the clock controller meets AT&T
Stratum 3 and Bell Canada Node Category D specifications. The
NTAK20BB version meets CCITT stratum 4 specifications.

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Shelf slot assignment

On non-CISPR B system cabinets, the NTAK20 is placed in slots 1-9. On
cabinets NTAK11Dx and NTAK11Fx, the active NTAK20 is placed in slots
1-3 (slots 4-10 cannot be used.) On IP Expansion cabinets, the NTAK20 is
placed in slots 11-19, 21-29, 31-39, 41-49 of the first, second, third, and
fourth expansion cabinets, respectively.

For CS 1000S, it is installed in slots 11-14, 21-24, 31-34, 41-44 of the first,
second, third and fourth MG 1000S, respectively.

Note: For CS 1000S, physical card slots are numbered 1-4 on the first,
second, third and fourth MG 1000S.

NTAK93 D-Channel Handler Interface (DCHI) daughterboard

The NTAK93 DCHI daughterboard interfaces with the system Central
Processing Unit (CPU) and mounts on the NTBK50 PRI card for PRI (but not
ISL) applications. The equivalent circuit resides on-board the NTAK79 2.0
Mb PRI card. The DTI/PRI digital trunk card is installed in the MG 1000S.
Digital trunk cards are not supported in MG 1000S Expansions.

The DCHI is responsible for performing the Q.921 layer 2 protocol

information. It transfers layer 3 signaling information between two adjacent
network switches.

The NTAK93 DCH daughterboard, when installed on the NTBK50 circuit

card, is addressed in the same slot as the NTBK50.

A minimum of one NTAK93 is required for each PRI link. If more than one
PRI link connects to the same end location, a single DCHI circuit card can
support up to a maximum of sixteen PRI connections for the system. This
allows for the support of 495 B-Channels or PRI trunks.

NTBK51 Downloadable D-Channel (DDCH) daughterboard

The NTBK51 DDCH daughterboard interfaces with the system Central
Processing Unit (CPU) and mounts on the NTBK50 2.0 Mb PRI circuit card
for PRI D-Channel applications.

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For CS 1000S, it is installed in slots 11-14, 21-24, 31-34, 41-44 of the first,
second, third and fourth MG 1000S, respectively.

Digital trunk cards are not supported in MG 1000S Expansions.

The DDCH is equivalent to the MSDL card on larger systems, but it only
supports D-channel applications (no SDI or ESDI).

The NTBK51 DDCH daughterboard, when installed on the NTBK50 circuit

card, is addressed in the same slot as the NTBK50.

A minimum of one NTBK51 is required for each PRI link. If more than one
PRI link connects to the same end location, a single DDCH circuit card can
support up to a maximum of 16 PRI connections for the system. This enables
support for 495 B-channels or PRI trunks.

Install the NTAK79 PRI card

The steps required to install PRI are as follows:
1 Inspect the PRI card.
2 Set the switches on the PRI card.
3 Insert the PRI card in slots 1-9 of the Small System main cabinet, or in
slots 11-19, 21-29, 31-39, 41-49 of the first, second, third, and fourth
Expansion cabinets, respectively.
4 For CS 1000S, it is installed in slots 11-14, 21-24, 31-34, 41-44 of the
first, second, third and fourth MG 1000S, respectively.
5 Connect the cables.

Each step is described in the pages that follow. The PRI hardware installation
procedure is the same regardless of the type of system at the far-end that is,
another system such as the AXE-10, or SYS-12.

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Inspect the NTAK79 circuit card

• Locate the NTAK79 2.0 Mb circuit card and carefully remove it from its
packaging.
• Inspect the circuit card for any visible damage that occurred during
shipping.

Set the switches on the NTAK79

The NTAK79 incorporates four on-board dip switches. The tables that follow
provide information on the various settings and related functions of these
switches.

Note: The ON position for all the switches is positioned toward the
bottom of the card. This is indicated by a white dot printed on the board
adjacent to the bottom left corner of each individual switch.

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Figure 83
NTAK79 with switch locations

NTAK79

Faceplate Switch 3
1 2

LEDs Switch 1
1 2

Switch 2 Switch 4
Jack 1 2 1 2

553-7869.EPS

Set the switches on the circuit card according to the requirements of your
specific installation:

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Switch SW1 — DCHI configuration

This switch enables and disables the on-board DCHI and sets the operating
mode of the DCHI.
For the U.K., use DPNSS1 mode. For all other countries, use Q.931 mode.

Table 92
Switch SW1

Switch Down (On) Up (Off)

SW 1-1 enable DCHI disable DCHI

SW 1-2 DPNSS1/DASS2 Q.931

Switch SW2 — Carrier impedance configuration

This switch sets the carrier impedance to either 120¾ or 75¾. Twisted pair
cable is usually associated with 120¾. Coaxial cable is usually associated
with the 75¾ setting.

Table 93
Switch SW2

Cable Type SW 2-1 SW 2-2

75¾ Up (Off) Down (On)

120¾ Down (On) Up (Off)

Switch SW3 — Clock controller configuration

This switch enables and hardware disables the on-board Clock Controller.
SW 3-2 should be disabled if the on-board clock controller is not in use.

Table 94
Switch SW3

Switch Down (On) Up (Off) Note

SW 3-1 — — Spare

SW 3-2 Disabled Enabled

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Switch SW4 — Carrier shield grounding

This switch allows for the selective grounding of the Tx/Rx pairs of the
carrier cable. Closing the switch (down position) applies Frame Ground
(FGND) to the coaxial carrier cable shield, creating a 75¾ unbalanced
configuration. This applies only to the NTBK05CA cable.

Table 95
Switch SW4

Switch Down (On) Up (Off)

SW 4-1 Rx—FGND Rx—OPEN

SW 4-2 Tx—FGND Tx—OPEN

Note: The usual method is to ground the outer conductor of the receive
coax signal.

Insert the NTAK79

Slide the circuit card into card slot 1-9 in the Small System main cabinet, or
in slots 11-19, 21-29, 31-39, 41-49 of the first, second, third, and fourth IP
Expansion cabinets, respectively.

For CS 1000S, it is installed in slots 11-14, 21-24, 31-34, 41-44 of the first,
second, third and fourth MG 1000S, respectively.

Secure the circuit card in the cabinet by locking the lock latch assemblies. The
card number associated with a 2.0 Mb PRI card is based on the slot in which
the card is installed.

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Procedure 40
Connecting the cables
Follow the instructions below to connect cables to the NTAK79 PRI card. Also
refer to Figure 84.
1 In the cabling area, located directly below the card cage, remove the
retaining bar that secures the MDF cables. Connect the NTBK05DA/CA
interface cable to the 50-pin Amphenol connector below the slot in which
the NTAK79 is installed. Re-install the retaining bar to secure the cable(s)
in place.
2 Terminate the NTBK05DA/CA carrier cable as required.

End of Procedure

Figure 84
NTAK79 cabling

CS 1000S NTBKO5DA
120½ Twisted Pair (6.15 m)

2 Mb PRI To 2.048
or Mpbs Carrier
2Mb DTI Cross Connect

NTBKO5CA
75½ Coax Pair (6.15 m)
553-AAA1985

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NTBK05DA pinouts
The pinouts for the NTBK05DA cable are as follows:

Table 96
NTBK05DA pinouts

From: To:
50-pin MDF 9-pin
connector connector Colour Signal

pin 23 pin 6 Black R0

pin 48 pin 7 White T0

pin 50 pin 9 Bare R0/T0 FGND

pin 24 pin 2 Black R1

pin 49 pin 3 Red T1

pin 25 pin 5 Bare R1/T1 FGND

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NTBK05CA pinouts
The pinouts for the NTBK05CA cable are as follows:

Table 97
NTBK05CA pinouts

From: To: To: To:

50-pin MDF Transmit coax Receive coax 50-pin MDF
connector connector connector connector

pin 23 Inner conductor — —

pin 48 outer conductor — —

pin 24 — Inner conductor —

pin 49 — outer conductor —

pin 21 — — pin 49

pin 46 — — pin 48

Install the NTBK50 PRI card

The NTBK50 serves as a motherboard to the NTAK20 clock controller, and
either the NTBK51 Downloadable D-channel handler or the NTAK93
D-channel handler.

The steps required to install PRI are as follows:

1 Inspect the PRI card and daughterboards.
2 Set the switches on the PRI card.
3 Mount the daughterboard(s) on the PRI card.
4 Insert the PRI card in the Small System main cabinet or MG 1000S and
any IP expansion cabinets.
5 Connect the cables.

Each step is described in the pages that follow. The PRI hardware installation
procedure is the same regardless of the type of system at the far-end.

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Procedure 41
Inspecting the NTBK50 circuit card
1 Locate the NTBK50 2.0 Mb circuit card plus associated daughterboard(s)
and carefully remove them from their packaging.
2 Inspect the circuit cards for any visible damage that occurred during
shipping.

End of Procedure

Set the switches on the NTBK50

The NTBK50 incorporates three on-board dip switches. The following tables
provide information on the various settings and related functions of these
switches.

Note: The ON position for all the switches is positioned toward the
bottom of the card. This is indicated by a white dot printed on the board
adjacent to the bottom left corner of each switch.

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Figure 85
NTBK50 with switch locations

NTBK50

Faceplate

LEDs Switch 1
1 2

Switch 4
Jack 1 2

Switch 2
1 2

553-7871.EPS

Set the switches on the circuit card according to the requirements of your
installation.

Switch SW1 — DCHI configuration (NTAK93 only)

This switch enables and disables the DCHI and sets the operating mode of the
DCHI. It is only used if an NTAK93 D-channel handler daughterboard is
being used. It has no effect when using the NTBK51 DDCH daughterboard.

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For the U.K., use DPNSS1 mode. For all other countries, use Q.931 mode.

Table 98
Switch SW1

Switch Down (On) Up (Off)

SW 1-1 — —

SW 1-2 DPNSS1/DASS2 Q.931

Switch SW2 — Carrier impedance configuration

This switch sets the carrier impedance to either 120¾ or 75¾. Twisted pair
cable is usually associated with 120¾. Coaxial cable is usually associated
with the 75¾ setting.

Table 99
Switch SW2

Cable type SW 2-1

75¾ Down (On)

120¾ Up (Off)

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Switch SW4 — Carrier shield grounding

This switch supports the selective grounding of Tx and Rx pairs of carrier
cable. Closing the switch (down position) applies Frame Ground (FGND) to
the coaxial carrier cable shield, creating a 75¾ unbalanced configuration.
This applies only to the NTBK05CA cable.

Table 100
Switch SW3

Switch Down (On) Up (Off)

SW 4-1 Rx—FGND Rx—OPEN

SW 4-2 Tx—FGND Tx—OPEN

Note: The usual method is to ground the outer conductor of the receive
coax signal.

Mount the daughterboards on the NTBK50

Use the following procedure to mount and remove the NTAK20 CC and the
NTBK51 DDCH or NTAK93 DCHI daughterboards onto the NTBK50 PRI.

Install the NTAK93 or NTBK51 daughterboard before the NTAK20

daughterboard. Work on a flat surface when mounting or removing
daughterboards.
1 Visually inspect the connector pins on the underside of the
daughterboard. Realign any bent pins prior to mounting.
2 Place the NTBK50 down flat on an anti-static pad.
3 From an overhead view, with the daughterboard parallel above the
NTBK50 and the connector pins aligned over the connector sockets,
align the mounting holes on the daughterboard with the tops of the
standoffs on the NTBK50 (see Figure 86 on page 352).

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4 Slowly lower the daughterboard toward the NTBK50, keeping the

standoffs in line with all four holes, until the holes rest atop the four
standoffs.
If more than slight pressure is required at this point, the connector pins
might not be aligned with the connector socket. If so, lift the
daughterboard off the NTBK50 and return to step 2.

5 Gently apply pressure along the edge of the board where the connector is
located until the standoffs at the two corners adjacent to the connector
snap into a locked position. Then press down on the two corners on the
opposite side until they lock into place.

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Figure 86
Daughterboard installation

Stiffeners

NTAK20
Clock
Controller

Connector Sockets
LEDs
DIS
ACT
RED 1 2
YEL SW1 On
LBK Off
CC
DCH

1 2
Bantam n
Jacks SW4 O
RCV Off NTAK93 or
1 2 NTBK51
On D-Channel
SW2 Interface
Off

XMT

553-7872

Standoffs

553-7872.EPS

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Remove the daughterboards from the NTBK50

Use these guidelines to remove the NTAK20 and NTBK51 or NTAK93 from
the NTBK50 PRI card. Because of the physical layout of the mother and
daughterboards, the NTAK20 should be removed before the NTAK93 or
NTBK51.
1 Starting at the two corners opposite the connector, gently lift each corner
out of the locking groove of the standoff.
2 At the two corners adjacent to the connector, gently lift the entire side
until the mounting holes are clear of the locking groove of the standoff.
3 To remove the connector pins, grasp the edge of the board adjacent to the
connector and lift gently.

If more than one NTBK50 card is installed, the additional cards may not carry
daughterboards, depending on system configuration. At least one NTAK20
(per system) is always required.

Insert the NTBK50

Slide the circuit card into card slot 1-9 in the Small System main cabinet, or
in slots 11-19, 21-29, 31-39, 41-49 of the first, second, third, and fourth IP
expansion cabinets, respectively.

For CS 1000S, it is installed in slots 11-14, 21-24, 31-34, 41-44 of the first,
second, third and fourth MG 1000S, respectively.

Note: For CS 1000S, physical card slots are numbered 1-4 on the first,
second, third and fourth MG 1000S.

Secure the circuit card in the cabinet by locking the lock latch assemblies. The
card number associated with a 2.0 Mb PRI card is based on the slot in which
the card is installed.

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Connect the cables

Follow the instructions below to connect cables to the NTBK50 PRI card.
Also refer to Figure 87.
• In the cabling area, located directly below the card cage, remove the
retaining bar that secures the MDF cables. Connect the NTBK05DA/CA
interface cable to the 50-pin Amphenol connector below the slot in which
the NTBK50 is installed. Re-install the retaining bar to secure the
cable(s) in place.
• Terminate the NTBK05DA/CA carrier cable as required.

Figure 87
NTBK50 cabling

NTBKO5AA
120½ Twisted Pair
Small System

To 2.048
NTBK50 Mpbs Carrier
Cross Connect

NTBKO5CA
75½ Coax Pair
553-AAA1073

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NTBK05DA pinouts
The pinouts for the NTBK05DA cable are as follows:

Table 101
NTBK05DA pinouts

From:
50-pin MDF To:
connector 9-pin connector Colour Signal

pin 23 pin 6 Black R0

pin 48 pin 7 White T0

pin 50 pin 9 Bare R0/T0 FGND

pin 24 pin 2 Black R1

pin 49 pin 3 Red T1

pin 25 pin 5 Bare R1/T1 FGND

NTBK05CA pinouts
The pinouts for the NTBK05CA cable are as follows:

Table 102
NTBK05CA pinouts

From: To: To: To:

50-pin MDF Transmit coax Receive coax 50-pin MDF
connector connector connector connector

pin 23 Inner conductor — —

pin 48 outer conductor — —

pin 24 — Inner conductor —

pin 49 — outer conductor —

pin 21 — — pin 49

pin 46 — — pin 48

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PRI software implementation

The following information describes the process required to program basic
2.0 Mb PRI on the system.

PRI cards must be configured before defining the DCH links or PRI
applications.

Prompts which do not show a response are left as default. For more
information on any of these prompts, refer to Software Input/Output:
Administration (553-3001-311).

Task summary
Note: Before installing PRI cards in IP expansion cabinets or
MG 1000S systems, configure them for IP connectivity. Refer to LD 117
in the Software Input/Output: Maintenance (553-3001-511) for further
information.

The following is a summary of the tasks in this section:

1 LD 17 — Adding a PRI card
2 LD 17 — Adding a DCHI or DDCH
3 LD 15 — Defining a PRI customer
4 LD 16 — Defining a PRI service route
5 LD 14 — Defining service channels and PRI trunks
6 LD 73 — Defining system timers and clock controller parameters
7 LD 73 — Defining PRI parameters and thresholds
8 LD 73 — Changing trunk pad category values

LD 17 — Adding a PRI card (Part 1 of 2)

Prompt Response Description

REQ CHG Change data.

TYPE CFN Configuration data block.

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LD 17 — Adding a PRI card (Part 2 of 2)

Prompt Response Description

CEQU YES Changes to common equipment.

PRI2 xx The PRI2 digital card number, where:

xx = 1-9 (Option 11C main cabinet), 11-19 (IP expansion
cabinet 1), 21-29 (IP expansion cabinet 2), 31-39 (IP expansion
cabinet 3), 41-49 (IP expansion cabinet 4.)

xx = 11-14, 21-24, 31-34, 41-44 of the first, second, third and

fourth MG 1000S, respectively.

LD 17 — Adding a DCHI or DDCH (Part 1 of 3)

Prompt Response Description

REQ CHG Change data.

TYPE CFN Configuration data block.

ADAN NEW DCH xx Add a primary D-channel (any unused SDI port.)
CHG DCH xx Change a primary D-channel.
OUT DCH xx Out the primary D-channel, where:
xx = 1-9 for Option 11C main cabinet, 11-19 for IP expansion
cabinet 1, 21-29 for IP expansion cabinet 2, 31-39 for IP
expansion cabinet 3, and 41-49 for IP expansion cabinet 4.

xx = 11-14, 21-24, 31-34, 41-44 of the first, second, third and

fourth MG 1000S, respectively.

CTYP MSDL Card type where:

TMDI MSDL = The NTBK51BA Downloadable D-Channel
Daughterboard.
TMDI = TMDI (NTRB21) card.

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LD 17 — Adding a DCHI or DDCH (Part 2 of 3)

Prompt Response Description

CDNO 1-50 Card slot number used as the primary DDCH/DCHI.

Card slots 10, 20, 30, 40, and 50 are only applicable for
D-channel configuration of ISL or VNS.

PORT 1 PORT set to "1".

USR PRI D-channel is for ISDN PRI only.

Note: 2.0 Mb only supports PRI or SHA user mode.

IFC xx Interface type.

DCHL xx PRI card number carries the D-channel. Must match entry
made for the "CDNO" associated with the "DCHI" prompt
above.

Where: xx = 1-9 for Option 11C main cabinet, 11-19 for IP

expansion cabinet 1, 21-29 for IP expansion cabinet 2,
31-39 for IP expansion cabinet 3, and 41-49 for IP
expansion cabinet 4.

xx = 11-14, 21-24, 31-34, 41-44 of the first, second, third and

fourth MG 1000S, respectively.

PRI2 <CR> Additional PRI Loops controlled by this DCHI. Remember

one DCHI can control up to 16 PRI loops going to the same
destination. For the system, the maximum limit is eight
loops.

OTBF 1-(16)-127 Number of output request buffers. Note: for a single PRI link,
leave this prompt at default (16). Add 5 output request
buffers per additional link.

SIDE NET (USR) Prompted only if IFC is set to SL1.

NET = network, the controlling switch
USR = slave to the controller

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LD 17 — Adding a DCHI or DDCH (Part 3 of 3)

Prompt Response Description

RLS XX Software release of far-end. This is the current software

release of the far-end. If the far-end has an incompatible
release of software, it prevents the sending of application
messages, for example, ‘Network Ring Again.

RCAP MSL MSDL RCAP capability.

OVLR <CR> Allow or disallow overlap receiving on a D-channel. Default

is NO.

LAPD YES (NO) Change LAPD parameters. Enter carriage return if timers
are left at default. The following timers are prompted only if
LAPD is set to YES. They are all left at default during initial
set-up.

- T23 1-(20)-31 Interface guard timer checks how long the interface takes to
respond. In units of 0.5 seconds (default 20 = 10 seconds).

T200 2-(3)-40 Retransmission timer in units of 0.5 seconds (default 3 = 1.5

seconds).

- N200 1-(3)-8 Maximum number of retransmissions.

- N201 4(260) Maximum number of octets in information field.

-K 1-(7)-32 Maximum number of outstanding unacknowledged frames

(NAKS).

LD 15 — Defining a PRI customer (Part 1 of 3)

Prompt Response Description

REQ: NEW Add new data.

CHG Change existing data.

TYPE: NET Networking data.

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LD 15 — Defining a PRI customer (Part 2 of 3)

Prompt Response Description

CUST 0-99 Customer number

Range for Large System, Call Server 1000E, and
Media Gateway 1000E

0-31 Range for Small System, CS 1000S system, Media Gateway

1000B, and Media Gateway 1000T

LDN XXXX Enter the customer's Listed Directory Number.

AC2 Access Code 2. Enter call types (type of number) that use
access code 2. Multiple responses are permitted. This prompt
only appears on NARS equipped systems. If a call type is not
entered here, it automatically defaults to access code 1.

NPA E.164 National.

NXX E.164 Subscriber.

INTL International.

SPN Special Number.

LOC Location Code.

ISDN YES Customer is equipped with ISDN.

PNI 1-32700 Customer private network identifier. This number is unique to

this customer in the private network. For example, it is used as
part of the setup message for feature operation such as
Network Ring Again and Network ACD. Note that if PNI is set to
zero (0), NRAG and NACD does not work.

HNPA NPA Telephone area code for this system. Sent in the setup
message as calling line identification.

HNXX NXX Telephone local exchange code for this system. Sent in the
setup message as calling line identification.

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LD 15 — Defining a PRI customer (Part 3 of 3)

Prompt Response Description

HLOC XXX Home location code (NARS)

LSC 1-9999 One to four digit Local Steering Code established in the
Coordinated Dialing Plan (CDP). The LSC prompt is required
for Calling Line ID and Network ACD.

LD 16 — Defining a PRI service route (Part 1 of 2)

Prompt Response Description

REQ NEW Add new data.

CHG Change existing data.

TYPE RDB Route data block.

TKTP xxx Trunk type.

DTRK YES Digital trunk route.

DGPT PRI2 2.0 Mb PRI. Prompted only if PRA = YES in LD15.

ISDN YES ISDN option.

MODE PRI Route used for PRI only.

PNI 1-32700 Customer private network identifier. Is the same as the CDB
PNI at far-end.

IFC xx Interface type.

CHTY BCH Signaling type. Prompted if DTRK is YES. D-channel signaling

for B-channels.

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LD 16 — Defining a PRI service route (Part 2 of 2)

Prompt Response Description

CTYP aaa Call Type. Enter the call type to associate with the outgoing
<CR> route for direct dialing using the trunk access code (instead of
NARS access code).

INAC YES Insert Access Code. Permits the NARS AC1 or AC2 access
code to be re-inserted automatically on an incoming ESN call.
This prompt only appears on a TIE route and is set to "YES" for
features such as Network ACD to function.

On an existing ESN network, setting this prompt to "YES" may

also require modifying the Digit Manipulation Index (DMI)
associated with this route at the far-end (so the Access Code is
not re-inserted twice). The INSERT prompt (INST) is bypassed
if INAC = YES.

LD 14 — Defining service channels and PRI trunks (Part 1 of 2)

Prompt Response Description

REQ NEW Add new data.

CHG Change existing data.

Note: When assigning several members at once use the

multiple create command NEW XX.

TYPE TIE TIE trunk only, allowed between MSL-1.

TN l ch Loop and channel for digital trunks

RTMB Route number and Member number

0-511 1-4000 Range for Large System and CS 1000E system.

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LD 14 — Defining service channels and PRI trunks (Part 2 of 2)

Prompt Response Description

0-127 1-4000 Range for CS 1000M Small System, Meridian 1 Small System,
CS 1000S system, Media Gateway 1000B, and
Media Gateway 1000T.

...

LD 73 — Defining system timers and clock controller parameters (Part 1 of 2)

Prompt Response Description

REQ CHG Change data.

TYPE PRI2 2.0 Mb PRI.

FEAT SYTI System timers.

CCO xx Card slot number for Clock Controller 0.

PREF CCO xx Card number of PRI/DTI/SILC containing the primary clock

reference for the main cabinet

SREF CCO xx Card number of PRI/DTI/SILC containing the primary clock

reference for the main cabinet

CC1 xx Card number for Clock Controller 1.

PREF CC1 xx Primary Reference DTI/PRI loop for Clock controller one.

SREF CC1 xx Primary Reference DTI/PRI loop for Clock controller one.

CC2 xx Card number for Clock Controller 2.

PREF CC2 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

SREF CC2 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

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LD 73 — Defining system timers and clock controller parameters (Part 2 of 2)

Prompt Response Description

CC3 xx Card number for Clock Controller 3.

PREF CC3 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

SREF CC3 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

CC4 xx Card number for Clock Controller 4.

PREF CC4 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

SREF CC4 xx Card number of PRI/DTI/SILC or DTI2/PRI2/SILC containing

the primary clock reference.

CCAR 0-(15) Clock Controller Audit Rate.

Enter the time (in minutes) between normal CC audits.

LD 73 — Defining PRI parameters and thresholds (Part 1 of 4)

Prompt Response Description

REQ CHG Change data.

TYPE PRI2 2.0 Mb PRI.

FEAT LPTI Loop timers.

LOOP X X is the slot number of the 2.0 Mb PRI card.

MFF AFF (CRC) Alternate mode or CRC multi-frame mode.

ALRM (REG) ALT Default or alternate alarms selected.

G10S

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 2.0 Mb PRI implementation Page 365 of 396

LD 73 — Defining PRI parameters and thresholds (Part 2 of 4)

Prompt Response Description

SLP mc mt oc ot Slip error count.

Where:
mc = Maintenance threshold slip count, 1- (5)-255.

mt = Maintenance threshold time, default 24 hours.

oc = Out-of-service threshold slip count, 1-(30)-255.

ot = Out-of-service threshold time, default 1 hour.

BPV n1 n2 Bipolar violation error count. Range is 1-(128)-255 for n1,

1-(122)-255 for n2.

Where:
n1 is multiplied by 16 to obtain the actual count, giving an actual
count range of 16-4080.

CRC n1 n2 Cyclic redundancy check error count. Range is 1-(201)-255 for

n1, 1-(97)-255 for n2.

Where:
n1 is multiplied by 4 to obtain the actual count, giving an actual
count range of 4-1020.

FAP n1 n2 Frame alignment problem error count. Range is 1-(28)-255 for

n1, (1)-255 for n2.

RATS 1-(10)-15 Number of seconds firmware has to check BPV/CRC/FAP for

excessive error rate.

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LD 73 — Defining PRI parameters and thresholds (Part 3 of 4)

Prompt Response Description

GP2 T2 mt dt ct ot Group 2 error thresholds.

This is the maximum amount of time that can elapse before
software checks the associated thresholds of 120 to 32,640
msec and rounds it to the closest multiple of 128 msec.

Where:
T2 = Error count values are in the range 1-(20)-255.
mt = Maintenance threshold time (MNT)(default =100S).
dt = No new data calls threshold time (NNDC)(default =12S).
ct = No new calls threshold time (NNC)(default =12S).
ot = Out of service threshold time (OOS)(default =4S).

Note 1: The following requirements must be met for input

mt = >dt = >ct = >ot.

Note 2: Threshold times are one of the following: nnnnT, nnnS,

nnnM, or nnH, where nnnn is and integer and T,S,M, or H show
the increments of use. The values are as follows:
-nnnnT is the time in 20 millisecond increments
(nnnn = 20-5000)
- nnnS is the time in 1 second increments (nnn= 1-240)
- nnnM is the time in 1 minute increments (nnn= 1-240)
- nnH is the time in 1 hour increments (nn= 1-24)

MNG1 nnnM Maintenance Guard time Group 1, default = 15M.

NCG1 nnnM No New Calls Guard time Group 1, default = 15M.

OSG1 nnnM Out Of Service Guard time Group 1, default = 15M.

MNG2 nnnS Maintenance Guard time Group 2, default = 15S.

NCG2 nnnS No New Calls Guard time Group 2, default = 15S.

OSG2 nnnS Out Of Service Guard time Group 2, default = 15S.

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LD 73 — Defining PRI parameters and thresholds (Part 4 of 4)

Prompt Response Description

PERS ttt Persistence Timer for Group II problems.

Enter 0-256 msec in increments of 2 msec. Default is 50
(=100ms).

CLRS ttt Clearance Timer for Group II problems. Enter 0 - 256 msec in
increments of 2 msec. Default is 50 (=100ms).

OOSC nnn Out-of-Service Counter.

Range for nnn of 0-255 with a default of 5.

LD 73 — Changing trunk pad category values (Part 1 of 2)

Prompt Response Description

REQ CHG Change data.

TYPE PRI2 2.0 Mb PRI.

FEAT PADS

PDCA # PAD table-0 is default and is hard coded.

The following prompts define the pad levels.

The receiving pad code is r and the transmission pad code is t. These entries have the range
0-15. The pad values (in decibels) relating to these codes are shown after this table.

ONP r t On-premises extension.

DSET r t Meridian Digital set.

Prompted only if the 2.0 Mb Gateway feature is equipped.

OPX r t Off-premises extension.

DTT r t Digital TIE trunks.

SDTT r t Digital Satellite TIE trunks.

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LD 73 — Changing trunk pad category values (Part 2 of 2)

Prompt Response Description

NTC r t Nontransmission compensated.

TRC r t Transmission compensated.

DCO r t Digital COT, FEX, WAT, and DID trunks.

VNL r t Via Net Loss.

DTO r t 2.0 Mb PRI2 digital TOLL office trunks.

ACO r t Analog CO or WATS trunks.

AFX r t Analog FEX trunks.

ADD r t Analog DID trunks.

SATT r t Analog satellite TIE trunks.

ATO r t Analog TOLL office trunks.

PRI2 r t 2.0 Mb PRI trunk.

Prompted only if the 1.5/2.0 Mb Gateway feature is equipped
and TYPE=2.0 Mb PRI.

XUT r t Analog CO trunk.

Prompted only if the 1.5/2.0 Mb Gateway feature is equipped
and TYPE=PRI2.

XEM r t Analog TIE trunk.

Prompted only if the 1.5/2.0 Mb Gateway feature is equipped
and TYPE=PRI2.

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 2.0 Mb PRI implementation Page 369 of 396

Table 103 shows the pads available to 2.0 Mb PRI. Positive dB represents
loss and negative dB represents gain.

Table 103
Pad values

code 0 1 2 3 4 5 6 7

value 0.0 +1.0 +2.0 +3.0 +4.0 +5.0 +6.0 +7.0

(dB)

code 8 9 10 11 12 13 14 15

value +8.0 +9.0 +10.0 +11.0 +12.0 +13.0 +14.0 -1

(dB)

code 16 17 18 19 20 21 22 23

value -2 -3 -4 -5 -6 -7 -8 -9
(dB)

code 24 25 26

value -10 idle +0.6

(dB)

Configure DPNSS1 with IP expansion cabinets/MG 1000S

systems
For Small Systems, when configuring a PRI2 card slot number for DPNSS1,
the response to the DDCS prompt in LD 17 is: 1-9 (Option 11C Cabinet),
11-19 (IP expansion cabinet 1), 21-29 (IP expansion cabinet 2), 31-39 (IP
expansion cabinet 3), 41-49 (IP expansion cabinet 4).

For CS 1000S, the response is: 11-14, 21-24, 31-34, 41-44 for the first,
second, third and fourth MG 1000S, respectively.

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Configure ISDN BRI trunking with IP expansion cabinets/

MG 1000S systems
For Small Systems, when configuring the MISP card slot number for ISDN
BRI trunking in LD 27, the response to the LOOP prompt is: 1-9 (Option 11C
Cabinet), 11-19 (IP expansion cabinet 1), 21-29 (IP expansion cabinet 2),
31-39 (IP expansion cabinet 3), 41-49 (IP expansion cabinet 4).

For CS 1000S, the response is: 11-14, 21-24, 31-34, 41-44 for the first,
second, third and fourth MG 1000S, respectively.

For Small Systems, when configuring the DSL for ISDN BRI trunking in LD
27, the response to the MISP prompt is: 1-9 (Option 11C Cabinet), 11-19 (IP
expansion cabinet 1), 21-29 (IP expansion cabinet 2), 31-39 (IP expansion
cabinet 3), 41-49 (IP expansion cabinet 4).

For CS 1000S, the response is: 11-14, 21-24, 31-34, 41-44 for the first,
second, third and fourth MG 1000S, respectively.

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2.0 Mb ISL implementation

Contents
This section contains information on the following topics:
Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371
ISL hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372
ISL hardware installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 375
ISL software implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376

Overview
This chapter provides the information required to implement ISL on the
system including:
• hardware and software installation
• implementation of components needed to provide basic call service

ISDN features are treated separately in the chapter devoted to ISDN feature
implementation.

This chapter assumes that ESN implementation is already in place. It also

assumes that the reader has a basic understanding of NARS and CDP.

Two modes of ISL are available: shared and dedicated. This chapter covers
ISL installation in dedicated mode using dedicated and leased lines. Shared
mode installations are done according to the instructions supplied for PRI,
with the noted exceptions.

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ISL hardware requirements

ISL, regardless of the operation mode, uses analog or digital TIE lines as
B-channels.

ISL in shared mode

In shared mode, PRI hardware is required in addition to the existing TIE lines
interface cards.
• NT8D15 Analog trunk card(s)
• NTAK02 SDI/DCH, NTAK10 2.0 Mb DTI, NTAK79 2.0 Mb PRI, or
NTBK50 2.0 Mb PRI card(s)

Figure 88
ISL in shared mode

Small System Large System

DCHI
2MB PRI
D-channel
DCHI used for PRI & PRI
ISL

•
•

ISL
Analog/digital
TIE trunks 553-AAA1074

ISL in dedicated mode using leased line

The following hardware is required:
• NTAK02 SDI/DCH D-channel handler interface

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• A modem capable of the following: (such as Ventel 2400-33 or 2400

Plus II)
— minimum of 2400 baud
— synchronous operation
— must support leased line (also known as private line or
point-to-point) operation

• NTAK19BA 4-Port SDI Cable

Figure 89
ISL in dedicated mode using leased line

Small System Large System

ISL D-channel
leased lines

NTAK02
modem modem
DCHI DCHI
NTAK19AB
QCAD42A

ISL
Analog/digital
TIE trunks
553-AAA1075

ISL in dedicated mode using dial-up modem

The requirements are as follows:
• NTAK02 SDI/DCH D-channel handler interface.

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• Modems such as the Ventel 2400, Hayes 2400 (the Hayes Smartmodem
2400 cannot be used on leased lines) or Gandalf 2400 that can support 2
or 4-wire leased line operation. 4-wire operation must be specified when
ordering. Otherwise, modems are factory shipped for 2-wire operation.
Modems capable of the following:
— autodial capability
— minimum of 2400 baud
— synchronous operation
— programmable so that one modem originates the call while the other
auto-answers
• NTAK19BA 4-port SDI cable.
• NT8D09 500 set line card.

Figure 90
ISL in dedicated mode using dial-up modem

Small System Large System

NTAK19BA QCAD42A

NTAK02 modem modem DCHI

DCHI

twisted twisted 500

500 line
pair pair
line
ISL D-channel
TIE
TIE

TIE TIE
ISL TIE trunks
553-AAA1076

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ISL hardware installation

Shared mode
The hardware installation is identical to the PRI installation, with the addition
of analogue or digital TIE trunks (or both).

Dedicated mode
Procedure 42
Installing the NTAK02
The NTAK02 connects to the modem through the NTAK19BA 4-port cable.
Only ports 1 and 3 are available for use as DCHIs.
1 Set option switches/jumpers on the DCHI card, as shown in Table 104
and Table 105, for mode of operation that is, RS232 or RS422 and DTE
or DCE.
2 Install the NTAK02 in any spare slot 1-9 of the Main Cabinet or slots 11-14
of the MG 1000S.
3 Install the NTAK19BA four port cable on the 50-pin Amphenol connector
associated with the slot holding the NTAK02.

Table 104
NTAK02 switch settings

Port 0 Port 1 SW1-1 SW1-2

SDI DCH OFF OFF

SDI DPNSS1 OFF ON

— ESDI ON ON

Port 2 Port 3 SW1-3 SW1-4

SDI DCH OFF OFF

SDI DPNSS1 OFF ON

— ESDI ON ON

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Table 105
NTAK02 jumper settings

Jumper Strap for Strap for Jumper

Unit location DTE DCE location RS422 RS232

Unit 0 J10 C-B B-A

Unit 1 J7 C-B B-A J9 C-B B-A

J6 C-B B-A J8 C-B B-A

Unit 2 J5 C-B B-A

Unit 3 J4 C-B B-A J2 C-B B-A

J3 C-B B-A J1 C-B B-A

Procedure 43
Setting up the D-channel
If this is a dedicated mode installation using leased line modems, the
D-channel connects the DCHI with the far-end modem over a dedicated
leased line. Synchronous modems with a minimum 2400 baud data rate must
be configured. Modems must support leased line capability and synchronous
mode. The Hayes Smartmodem 2400 cannot be used on leased lines.
If this a dedicated mode using dial-up modems, modems such as Hayes 2400,
Ventel 2400 or Gandalf 2400 can be used. In this configuration, the DCHI
connects to a modem which is connected to a 500 set line card. The call
connects to the far-end through the 500 set-to-TIE trunk path.
Program the modem at one end in the auto-dial mode, so it automatically
initiates a call to the other end at power up. The auto-dial number must be
coordinated with the far-end switch. The originating modem has this auto-dial
number stored internally as part of the modem configuration routine.
The far-end modem need only be set-up for auto-answer.

End of Procedure

ISL software implementation

There are two modes of ISDN Signaling Link (ISL) operation, shared mode
and dedicated mode.

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Shared mode
The NTAK79 on-board DCHI supports ISDN PRI signaling and ISL trunks.
The configuration is basically the same as the PRI D-channel, with the
D-channel also supporting ISL trunks.

The DTI/PRI software implementation sequence can be used (refer to the

appropriate chapters for more information) with the following exceptions.

LD 17 — Shared mode

Prompt Response Description

USR SHA D-channel for ISL in “shared” mode, used for both ISDN PRI and
ISL.

ISLM 1-240 Number of ISL B-channel (trunks) controlled by the D-channel

(no default value).

LD 16 — Interface type

Prompt Response Description

IFC SL1 Interface type must be SL1 (this is the only type supported for
ISL).

MODE ISLD TIE route used for ISL members.

LD 14 — Channel identifier

Prompt Response Description

CHID 1-240 Channel identifier for ISL channels. Must be coordinated with
the far-end.

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Dedicated mode
The DCHI uses the NTAK02 circuit card and does not support ISDN PRI
signaling. The DCHI is reserved for ISL use only. The D-channel can
communicate with the far-end by means of a dedicated leased line modem or
dial-up modem.

Note that the following implementation relates to analogue TIE trunks being
used as B-channels. In the case where DTI/PRI trunks are also used, then
LD 17 digital loop (2.0 Mb PRI) and LD73 (2.0 Mb PRI/SYTI) must also be
configured with the appropriate clocking and threshold settings.

For ISL dedicated mode using a dial-up modem, a 500 set, TIE trunk route
and member must be programmed (used for D-channel). Table 106
summarizes the required steps.

Table 106
Configuring basic ISL capability

Step LD Action

1 17 Configure the D-channel for ISL use.

2 15 Enable ISDN option.

3 16 Enable the ISL option on a per route basis,

assign a D-channel for each route.

4 14 Assign a channel identification to each trunk

with the ISL option.

LD 17 — Configure the D-channel for ISL (Part 1 of 3)

Prompt Response Description

REQ CHG Change existing data

TYPE CFN Configuration data block.

ADAN NEW DCH 0-79 Add primary D-channel.

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LD 17 — Configure the D-channel for ISL (Part 2 of 3)

Prompt Response Description

CTYP DCHI D-channel card type.

CDNO 0-15 Serial Data Interface (SDI) Card number

Number the SDI cards logically with the system.

1-9 11-19 21-29, MSDL application small system Card number

31-39 41-49
1-50 DCHI small system Card number

PORT 1 Must be set to 1.

USR PRI D-channel for ISDN PRI only.

IFC SL1 Interface type.

DCHL 1-9 PRI2 card number. (Must match entry for CDNO).

SIDE NET (USR) Net: network, the controlling switch.

User: slave to controller.

RLS XX Software release of far-end. This is the current software

release of the far-end. If the far-end has an incompatible
release of software, it prevents the sending of application
messages. For example, for Network Ring Again.

CLOK D-channel clock type for signaling.

EXT Source of D-channel clock is external to DCHI card (in this

case the DTI/PRI circuit card). Normally, EXT is used for PRI/
ISL.

Note: Do not confuse this clock with the E1 span Clock

Controller found on the NTAK10/79. This clock is in reference
to the DCHI synchronous mode of operation.
Note: If directly connecting two DCHI ports with out the use
of modems, set “CLOK” to “EXT” on one side and “INT” on the
other.

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LD 17 — Configure the D-channel for ISL (Part 3 of 3)

Prompt Response Description

LAPD YES,(NO) Change LAPD parameters. Simply carriage return if timers are
to be left at default value. The following timers are prompted
only if LAPD is set to YES. The following can all be left at
default during initial set-up.

T23 1-(20)-31 Interface guard timer checks how long the interface takes to
respond. In units of 0.5 seconds (default 20 = 10 seconds).

T200 2-(3)-40 Retransmission timer in units of 0.5 seconds (default 3 = 1.5

seconds).

N200 1-(3)-8 Maximum number of retransmissions.

N201 4(260) Maximum number of octets in information field.

K 1-(7)-32 Maximum number of outstanding unacknowledged frames

(NAKS).

LD 15 — Enable the ISDN option (Part 1 of 2)

Prompt Response Description

REQ: NEW Add new data.

CHG Change existing data.

TYPE: NET Networking data.

CUST Customer number

0-99 Range for Large System, Call Server 1000E, and Media Gateway
1000E

0-31 Range for Small System, CS 1000S system, Media Gateway

1000B, and Media Gateway 1000T

ISDN YES Customer is equipped with ISDN.

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LD 15 — Enable the ISDN option (Part 2 of 2)

Prompt Response Description

PNI 1-32700 Customer private network identifier. MUST be unique to this

customer in the private network. Used as part of the setup message
for feature operation such as Network Ring Again and Network
ACD.

HNPA NPA Telephone area code for this system. Sent as part of setup message
as CLID.

HNXX NXX Telephone local exchange code for this system. Sent as part of
setup message for calling line identification.

HLOC XXX Home location code (NARS).

LSC 1-9999 One to four digit Local Steering Code established in the Coordinated
Dialing Plan (CDP). The LSC prompt is required for Calling Line ID
and Network ACD.

AC2 Access Code 2. Enter call types (type of number) that use access
code 2. Multiple responses are permitted. This prompt only appears
on NARS equipped systems. If a call type is not entered here, it is
automatically defaulted to access code 1.

NPA E.164 National.

NXX E.164 Subscriber.

INTL International.

SPN Special Number.

LOC Location Code.

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LD 16 — Enable the ISL option (Part 1 of 2)

Prompt Response Description

REQ NEW Add new data.

CHG Change existing data.

TYPE RDB Route data block.

CUST xx Customer number, as defined in LD 15

ROUT Route number

0-511 Range for Large System and CS 1000E system.

0-127 Range for CS 1000M Small System, Meridian 1 Small System, CS

1000S system, Media Gateway 1000B, and Media Gateway 1000T.

TKTP TIE TIE trunk route.

DTRK YES Enter YES if this is a Digital Trunk Interface (DTI or PRI).
NO

ISDN YES ISDN option.

MODE ISLD Route for ISL application.

DCHI XX DCHI port number in CFN to carry the D-channel for this TIE trunk
route.

PNI 1-32700 Customer private network identifier. Must be the same as the CDB
PNI at the fa- end.

IFC Interface type.

SLl System to system.

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LD 16 — Enable the ISL option (Part 2 of 2)

Prompt Response Description

CTYP aaa Call Type. Enter the call type to be associated with the outgoing
<CR> route for direct dialing using the trunk access code (instead of NARS
access code).

INAC YES Insert Access Code. Permits the NARS AC1 or AC2 access code to
be re-inserted automatically on an incoming ESN call.

LD 14 — Assign a channel identifier

Prompt Response Description

REQ NEW Add new data.

CHG Change existing data.

TYPE TIE TIE trunk type.

TN Terminal Number
lscu Format for Large System and CS 1000E system,
where l = loop, s = shelf, c = card, u = unit.

cu Format for CS 1000M Small System, Meridian 1 Small

System, CS 1000S system, Media Gateway 1000B, and
Media Gateway 1000T, where c = card and u = unit.

RTMB Route number and Member number

0-511 1-4000 Range for Large System and CS 1000E system.

0-127 1-4000 Range for CS 1000M Small System, Meridian 1 Small

System, CS 1000S system, Media Gateway 1000B, and
Media Gateway 1000T.

CHID 1-240 Channel identifier for ISL channels (remove with Xnn). Must
be coordinated with far-end (no default value).

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396

Page 385 of 396

Non-standard cables

Contents
The section contains information on the following topics:
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386
NT5K40AA, NT5K41AA, NT5K86AA . . . . . . . . . . . . . . . . . . . . . . . . 386
NT8D7206, NT8D7207 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
QCAD128 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 387
QCAD129 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 388
QCAD133 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389
NT8D7205. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390
QCAD328 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391
NT8D74 Clock Controller to InterGroup cable . . . . . . . . . . . . . . . . . . 392
NT8D75 Clock Controller to Clock Controller cable . . . . . . . . . . . . . . 393
NT8D79 PRI/DTI to Clock Controller cable . . . . . . . . . . . . . . . . . . . . 393
NT8D83 PRI/DTI to I/O cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393
NT8D85 Network to IPE cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
NT8D86 Network to I/O cable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 394
NT8D97AX PRI/DTI I/O to MDF cable . . . . . . . . . . . . . . . . . . . . . . . 395
NT9J93AD PRI/DTI Echo Canceller to I/O cable . . . . . . . . . . . . . . . . 395
NTND26 PRI to MSDL cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 395
NTND27 MSDL to I/O panel cables. . . . . . . . . . . . . . . . . . . . . . . . . . . 395
NTND98 PRI to I/O panel cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 396

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Page 386 of 396 Non-standard cables

Introduction
This section provides information required to build systems cables of
non-standard lengths for ISDN PRI applications.

NT5K40AA, NT5K41AA, NT5K86AA

These cables are used to transport the 2Mb digital signal from the faceplate
connector on the PRI card to the Line Terminating Equipment interface.
• Standard lengths:
— NT5K40AA - 4 m (13 ft.)
— NT5K41AA - 8 m (26 ft.)
— NT5K86AA - 12m (39 ft.)
• Construction - 75 ohm dual co-axial type with solid inner conductor and
braided shield.
• J1 Connector - 15-pin, male, subminiature D with jack-screws
• J2 Connector - 75 ohm BNC crimp plug
• J3 Connector - 75 ohm BNC crimp plug
Table 107
NT5K40AA, NT5K41AA, NT5K86AA wire list

From To
(pack end) (I/O end) Signal

J1-1 J2 Inner Conductor XTIP (transmit)

J1-9 J2 Shield XRING (transmit)

J1-3 J3 Inner Conductor RTIP (receive)

J1-11 J3 Shield RRING (receive)

J1-9 J3 Shield FRAME GROUND

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 Non-standard cables Page 387 of 396

NT8D7206, NT8D7207
This cable is used to transport the 2Mb/s digital signal from the PRI pack to
the I/O assembly located at the cabinet bulkhead.
• Standard length -
3.05 m (10 ft.) for Half Group systems and Single group systems
• Construction - 24 AWG, stranded foil-shielded twisted pairs
• P1 Connector (Pack end) - 9-pin, male, subminiature D, with jack-screws
• P2 Connector (I/O Panel end) - 9-pin, male, subminiature D, with
jack-screws

Table 108
NT8D7206, NT8D7207 wire list

From To
Color (pack end) (I/O end) Signal

White P1-1 P2-6 XTIP (transmit)

Black P1-9 P2-7 XRING (transmit)

Green Shield nc P2-CASE P2-9 GROUND

Red P1-3 P2-2 RTIP (receive)

Black P1-11 P2-3 RRING (receive)

Red Shield nc P2-CASE P2-5 GROUND

QCAD128
This cable transports the T1 signal from the PRI pack to the I/O panel.
• Standard length - 10 ft. (3.05 m)
• Construction - 15-conductor ribbon, 28 AWG (0.321 mm), stranded
• P1 Connector - 15-pin, male, subminiature D, with jack-screws
• P2 Connector - 15-pin, male, subminiature D, with jack-screws

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See Table 109.

Table 109
QCAD128 wire list

From To Signal

P1-1 P2-1 XTIP (transmit tip) to telephone company

P1-2 P2-2 GND (ground)

P1-3 P2-3 RTIP (receive tip) from telephone company

P1-4 P2-4 GND (ground)

P1-5 P2-5

P1-6 P2-6

P1-7 P2-7

P1-8 P2-8

P1-9 P2-9 XRING (transmit ring) to telephone company

P1-10 P2-10

P1-11 P2-11 RRING (receive ring) from telephone company

P1-12 P2-12

P1-13 P2-13

P1-14 P2-14

P1-15 P2-15

QCAD129
This cable is used to connect the RS-232-C interface between an echo
canceller and the PRI pack.
• Standard length - 2.1 m (7 ft.)
• Construction - 22 AWG (0.644 mm), stranded

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 Non-standard cables Page 389 of 396

• P1 Connector - 15-pin, male, subminiature D, with jack-screws

• P2 connector - 25-pin, male, subminiature D, with jack-screws

Table 110
QCAD129 wire list

Echo
Canceller
PRI Signal From To Signal

DCD P1-1 P2-20 DTR

RXD P1-2 P2-2 TXD

DTR P1-4 P2-8 DCD

TXD P1-5 P2-3 RXD

GND P1-10 P2-7 GND

RTS P1-12 P2-4

CTS P1-9 P2-5

TPENB P1-15 nc
(Test Port Enable Bar)

QCAD133
For cabinets with an I/O filter assembly, this cable transports the T1 signal
from the I/O filter to the Network Channel Terminating Equipment (NCTE)
telephone company interface. See Table 111 on page 390.

For cabinets without an I/O filter assembly, this cable transports the T1 signal
from the QPC720 PRI pack to the NCTE telephone company interface.
• Standard length - 50 ft (15.3 m)
• Construction - Individually foil-shielded, twisted pairs, 24 AWG (0.511
mm), stranded

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Page 390 of 396 Non-standard cables

• P1 Connector - 15-pin, female, subminiature D with jack-screws

• P2 Connector - 15-pin, male, subminiature D, with slide-latch (optional
spring-latch loose-packed with cable assembly)

Table 111
QCAD133 wire list

Color From To PRI signal

WHITE P1-1 P2-1 XTIP (transmit tip) to

telephone company

BLACK P1-9 P2-9 XRING (transmit ring) to

telephone company

GRN SHLD P1-2 nc GND (ground)

RED P1-3 P2-3 RTIP (receive tip) from

telephone company

BLACK P1-11 P2-11 RRING (receive ring) from

telephone company

RED SHLD P1-4 nc GND (ground)

NT8D7205
This cable is used to transport the 2Mb digital signal from the I/O panel at the
cabinet bulkhead to the Network Channel Terminating Equipment (NCTE)
telephone company interface.
• Standard length - 15.3 m (50 ft.)
• Construction - Individually foil-shielded, twisted pairs, 24 AWG (0.511
mm), stranded
• P1 Connector - 9-pin, female, subminiature D with jack-screws
• P2 Connector - 9-pin, male, subminiature D, with jack screws

553-3001-201 Standard 3.00 August 2005

 Non-standard cables Page 391 of 396

Table 112
NT8D7205 wire list

From To
Color (pack end) (I/O end) Signal

White P1-6 P2-6 XTIP (transmit)

Black P1-7 P2-7 XRING (transmit)

Green Shield P1-9 nc GROUND

Red P1-2 P2-2 RTIP (receive)

Black P1-3 P2-3 RRING (receive)

Red Shield P1-5 nc GROUND

QCAD328
This cable is used to connect the PRI pack to the D-channel interface card,
either the QPC757 or NT6D11AB DCHI. There are two types of QCAD328
cables: QCAD328A and QCAD328B.
• QCAD328A - 1.8 m (6 ft)
• QCAD328B - 5.5 m (18 ft)
• QCAD328C - 10.67 m (35 ft)
• QCAD328D - 15.24 m (50 ft)
• Construction - 24 AWG (0.511 mm), stranded
• P1 Connector - 25-pin male, subminiature D
• P2 Connector - 15-pin male, subminiature D

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Table 113
QCAD328 wire list

From To Signal

P1-2 P2-2 SDA+

P1-13 P2-10 SDB-

P1-20 P2-15 TR

P1-15 P2-9 STA+

P1-14 P2-11 STB-

P1-3 P2-4 RDA+

P1-16 P2-12 RDB-

P1-17 P2-5 RTA+

P1-12 P2-13 RTB-

P1-8 P2-8 RR

P1-5 P1-8 CS

P1-7 P1-1 SG

P1-1 P2-1 GND

NT8D74 Clock Controller to InterGroup cable

This cable connects the QPC471 Clock Controller card to the NT8D36
InterGroup Module.

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 Non-standard cables Page 393 of 396

This cable is available in the following lengths:

• NT8D74AC 1.2 m (4 ft)
• NT8D74AD 1.8 m (6 ft)
• NT8D74AE 2.4 m (8 ft)
• NT8D74AF 3 m (10 ft)
(QCAD110B)
• NT8D74AJ 4.8 m (16 ft)

NT8D75 Clock Controller to Clock Controller cable

This cable interconnects QPC471 Clock Controller cards.

This cable is available in the following lengths:

• NT8D75AC 1.2 m (4 ft)
• NT8D75AD 1.8 m (6 ft)
• QCAD125 3 m (10 ft)

NT8D79 PRI/DTI to Clock Controller cable

This cable connects the PRI/DTI card to the QPC471 Clock Controller card.

This cable is available in the following lengths:

• NT8D79AB 0.6 m (2 ft)
• NT8D79AC 1.2 m (4 ft)
• NT8D79AD 1.8 m (6 ft)
• NT8D79AE 2.4 m (8 ft)
• NT8D79AF 3 m (10 ft)
(QCAD130)

NT8D83 PRI/DTI to I/O cable

This cable connects the PRI/DTI card (T1 port) to the I/O connector panel.

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This cable is available in the following lengths:

• NT8D83AC 1.2 m (4 ft)
• NT8D83AD 1.8 m (6 ft)

NT8D85 Network to IPE cable

This cable connects the following:
• QPC581 CMA card to QPC581 CMA card in dual CPU configuration
• QPC414 Network card to PRI/DTI card
• QPC414 Network card to QPC659 Dual Loop Peripheral Buffer card (for
internal cabling only)
• QPC659 Dual Loop Peripheral Buffer card to QPC659 Dual Loop
Peripheral Buffer card when connecting two NT8D13 IPE Modules
together

This cable is available in the following lengths:

• NT8D85AB 0.6 m (2 ft)
• NT8D85AC 1.2 m (4 ft)
• NT8D85AZ 1.5 m (5 ft)
• NT8D85AD 1.8 m (6 ft)
• NT8D85AE 2.4 m (8 ft)
• NT8D85AF 3 m (10 ft)
• NT8D85AJ 4.8 m (16 ft)
• NT8D85AL 6 m (20 ft)
• NT8D85AP 7.6 m (25 ft)
• NT8D85AV 13.7 m (45 ft)

NT8D86 Network to I/O cable

This cable connects the following to the I/O connector panel:
• QPC414 Network card

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 Non-standard cables Page 395 of 396

• PRI/DTI card
• QPC659 Dual Loop Peripheral Buffer card
• NT8D47 RPE

This cable is available in the following lengths:

• NT8D86AC 1.5 m (5 ft)
• NT8D86AD 1.8 m (6 ft)

NT8D97AX PRI/DTI I/O to MDF cable

This cable connects the PRI/DTI card to the MDF through the I/O connector
panel. It is 15.2 m (50 ft) long.

NT9J93AD PRI/DTI Echo Canceller to I/O cable

This cable connects the PRI/DTI Echo Canceller port to the I/O connector
panel. It is 1.8 m (6 ft) long.

NTND26 PRI to MSDL cables

These cables connect the MSDL card to the PRI cards.
• NTND26AA 6 feet
• NTND26AB 18 feet
• NTND26AC 35 feet
• NTND26AD 50 feet

NTND27 MSDL to I/O panel cables

These cables connect the MSDL card to the I/O panel.
• NTND27 6 ft

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Page 396 of 396 Non-standard cables

NTND98 PRI to I/O panel cables

These cables connect the PRI card to the I/O panel.
• NTND98 6 ft

553-3001-201 Standard 3.00 August 2005

Family Product Manual Contacts Copyright FCC notice Trademarks Document
number Product release Document release Date Publish

Nortel Communication Server 1000

ISDN Primary Rate Interface
Installation and Configuration

Copyright © Nortel Networks Limited 2005

All Rights Reserved

Information is subject to change without notice.

Nortel Networks reserves the right to make changes in design
or components as progress in engineering and manufacturing
may warrant.

Nortel, Nortel (Logo), the Globemark, This is the Way, This is

Nortel (Design mark), SL-1, Meridian 1, and Succession are
trademarks of Nortel Networks.

Publication number: 553-3001-201

Document release: Standard 3.00
Date: August 2005
Produced in Canada