HTU-2, HTU-2/PF

HDSL Data Modems

Installation and Operation Manual

Notice

This manual contains information that is proprietary to RAD Data Communications. No part of this
publication may be reproduced in any form whatsoever without prior written approval by RAD Data
Communications.

No representation or warranties for fitness for any purpose other than what is specifically mentioned in
this manual is made either by RAD Data Communications or its agents.

For further information contact RAD Data Communications at the address below or contact your local
distributor.

International Headquarters U.S. Headquarters

RAD Data Communications Ltd. RAD Data Communications Inc.

24 Raoul Wallenberg St. 900 Corporate Drive

Tel Aviv 69719 Israel Mahwah, NJ 07430 USA
Tel: 972-3-6458181 Tel: (201) 529-1100
Fax: 972-3-6498250 Toll free: 1-800-444-7234
E-mail: rad@rad.co.il Fax: (201) 529-5777
E-mail: market@radusa.com

© 2001 RAD Data Communications Publication No. 654-200-05/01

 Warranty
This RAD product is warranted against defects in material and workmanship for a period of one year
from date of shipment. During the warranty period, RAD will, at its option, either repair or replace
products which prove to be defective. For warranty service or repair, this product must be returned to
a service facility designated by RAD. Buyer shall prepay shipping charges to RAD and RAD shall pay
shipping charges to return the product to Buyer. However, Buyer shall pay all shipping charges, duties
and taxes for products returned to RAD from another country.

Limitation of Warranty
The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance
by Buyer, Buyer-supplied firmware or interfacing, unauthorized modification or misuse, operation
outside of the environmental specifications for the product, or improper site preparation or
maintenance.

Exclusive Remedies
The remedies provided herein are the Buyer’s sole and exclusive remedies. RAD shall not be liable for
any direct, indirect special, incidental, or consequential damages, whether based on contract, tort, or
any legal theory.

Regulatory Information
FCC-15 User Information
This equipment has been tested and found to comply with the limits of the Class A digital device,
pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection
against harmful interference when the equipment is operated in a commercial environment. This
equipment generates, uses and can radiate radio frequency energy and, if not installed and used in
accordance with the instruction manual, may cause harmful interference to the radio communications.
Operation of this equipment in a residential area is likely to cause harmful interference in which case
the user will be required to correct the interference at his own expense.

Warning per EN 55022

This is a Class A product. In a domestic environment, this product may cause radio interference, in
which case the user may be required to take adequate measures.
 HTU-2
Installation Instructions for
Compliance with EMC Requirements
To comply with electromagnetic compatibility requirements, a ferrite core should be installed on any
HDSL line cable of HTU-2 with an RJ-45 connector (using a FAIR-RITE catalog number 0443164151
core or equivalent). This limits the electromagnetic energy emitted from the cables.

➤ To install the ferrite core:

1. Run the cable through the open core.
2. Wrap the cable around the core and run it through again. Allow no more than 2 inches
(50 mm) between the core and the connector to the unit.
3. Snap the core shut.

Note V.35 only: to protect against electrostatic discharge (ESD) into the V.35 port, use a connector
with a hood, which completely covers the pin connection.

Safety Warnings
The exclamation point within a triangle is intended to warn the operator or
service personnel of operation and maintenance factors relating to the
product and its operating environment which could pose a safety hazard.
Always observe standard safety precautions during installation, operation and maintenance of this
product. Only a qualified and authorized service personnel should carry out adjustment, maintenance
or repairs to this instrument. No adjustment, maintenance or repairs should be performed by either the
operator or the user.
 Telecommunication Safety
The safety status of each of the ports on HTU-2 is declared according to EN 41003 and is detailed in
the table below. Interconnection of these ports with other apparatus should be made such that the
equipment continues to comply with clause 2.3 of EN60950 for SELV circuits after such a connection
is made.
On HTU-2/AC and HTU-2/DC:
Ports Safety Status
DCE SELV Circuits operating with Safety Extra-Low Voltage
HDSL TNV-1 Circuits whose normal operating voltage does not
exceed the limits of SELV, but is subject to
overvoltages from Telecommunications Networks.

On HTU-2/P:
Ports Safety Status
DCE TNV-1 Circuits whose normal operating voltage does not
exceed the limits of SELV, but is subject to
overvoltages from Telecommunications Networks.
HDSL (up to 120 VDC feeding TNV-3 Telecommunications Network Voltage subject to
voltage) Overvoltages

Additional Instructions
Concerning the Safety of TNV Circuits
For products which use TNV-3 circuits, the signal GND must be connected to the frame (chassis) GND.
The equipment must be earthed prior to the connection to the telecommunication network. To
connect the protective earth, use power sources with an earth conductor. If unavailable, use the earth
lug on the back panel. The compliance of the equipment with the safety standards may be invalidated
if the earth connection is interrupted. The maximum feed voltage permitted for the TNV-3 circuits is
120 VDC.
 Declaration of Conformity

Manufacturer's Name: RAD Data Communications Ltd.

Manufacturer's Address: 24 Raoul Wallenberg St.

Tel Aviv 69719
Israel

declares that the product:

Product Name: HTU-2

Conforms to the following standard(s) or other normative document(s):

EMC: EN 55022 (1987) Limits and methods of measurement of radio disturbance

characteristics of information technology equipment.

EN 50082-1 (1992) Electromagnetic compatibility – Generic immunity standards

for residential, commercial and light industry.
Safety: EN 60950 (1992/93) Safety of information technology equipment, including
electrical business equipment

Supplementary Information:
The product herewith complies with the requirements of the EMC Directive 89/336/EEC and the Low
Voltage Directive 73/23/EEC. The product was tested in a typical configuration.

Tel Aviv, August 5th, 1998

Haim Karshen
VP Quality

European Contact: RAD Data Communications GmbH, Berner Strasse 77, 60437 Frankfurt am Main, Germany
 Declaration of Conformity

Manufacturer's Name: RAD Data Communications Ltd.

Manufacturer's Address: 24 Raoul Wallenberg St.

Tel Aviv 69719
Israel

declares that the product:

Product Name: HTU-2/PF

Conforms to the following standard(s) or other normative document(s):

EMC: EN 55022 (1994): Limits and methods of measurement of radio disturbance

characteristics of information technology equipment.

EN 50082-1 (1992): Electromagnetic compatibility – Generic immunity standards

for residential, commercial and light industry.
Safety: EN 60950/A4 (1996): Safety of information technology equipment, including
electrical business equipment

Supplementary Information:
The product herewith complies with the requirements of the EMC Directive 89/336/EEC and the Low
Voltage Directive 73/23/EEC. The product was tested in a typical configuration.

Tel Aviv, May 21st, 2001

Haim Karshen
VP Quality

European Contact: RAD Data Communications GmbH, Berner Strasse 77, 60437 Frankfurt am Main, Germany
 Quick Start Guide

If you are familiar with HTU-2, use this guide to prepare it for operation.

1. Configuring the Functional Mode

If you are using HTU-2 as a central (LTU) unit, you can use the default settings of
the HTU-2 jumpers and switches.
➤ To configure HTU-2 as a remote unit (NTU):
1. Turn the unit off.
2. Disconnect all cables from the unit.
3. Open the HTU-2 case.
4. Set the R/C jumper (JP1) to the R (Remote) position.
5. Set section 2 of the S1 DIP switch to ON.
6. Turn the unit on for a short time (until the self-test is completed).
7. Turn the unit off.
8. Set section 2 of the S1 DIP switch back to OFF.
9. Close the HTU-2 case.
10. Turn the unit on.

2. Connecting the Cables

➤ Before using HTU-2, make the following cable connections:
1. Connect the data channel, by connecting the DTE to the HTU-2 rear panel
port designated DCE.
2. Connect the remote equipment (HDSL line) to HTU-2, by connecting the line
cable to the rear panel RJ-45 connector designated HDSL.
3. Connect HTU-2 to the power source, as follows:
ƒ For the AC version of HTU-2, use the 5 ft (1.5m) standard power cable
provided with the unit. Make sure the ON/OFF switch on the rear panel is
set to OFF, then connect the cable first to the HTU-2 rear panel, then to
the power source.
ƒ For the DC version of HTU-2, refer to DC Power Supply Connection
Supplement.
ƒ For the phantom-fed HTU-2/P, the power is automatically applied to the
unit as soon as you connect the HDSL line.

Connecting the Cables 1

Quick Start Guide HTU-2 Installation and Operation Manual

3. Configuring HTU-2
You can configure and operate HTU-2 from either the front panel or a supervisory
terminal.
Note Some of the HTU-2 configuration parameters depend on the type of remote unit
being used. Therefore, after the HDSL synchronization is reached, wait for about
1 minute before you start configuring the modem. This allows the proper
recognition of the remote unit and ensures the correct HTU-2 configuration.

Configuring HTU-2 from the Front Panel

➤ To configure HTU-2 from the front panel:
1. Scroll to SYSTEM PARAMETER in the top row of the front panel LCD and set
the master clock reference (available for the HTU-2 unit configured as central).
2. Scroll to CHANNEL PRM in the top row of the front panel LCD and select the
HDSL framer mode: framed or unframed.
Notes • It is recommended to select the framed mode, unless your application does not
explicitly need the unframed mode. For example, the unframed mode can be
used if your remote unit is HTU-E1 and desired payload rate is 2048 kbps.
• Any change in the HDSL framing mode causes double temporary HDSL
synchronization loss.

3. With the CHANNEL PRM in the top row, select the basic HDSL timeslot data
rate, timeslot allocation method, data channel speed, starting timeslot (for SEQ
and ALT mapping modes), or configure each timeslot to carry data or idle code
(for USER mapping mode).
4. Scroll to PB PARAMETERS in the top row of the front panel LCD and set the
priority for each timeslot (high or low), if necessary.
The remote unit automatically downloads the configuration of the central unit,
unless the CONFIG REMOTE parameter under the SYSTEM PARAMETER of
the central unit is set to NO.

Configuring HTU-2 from a Supervisory Terminal

If you want to manage HTU-2 from a supervisory terminal, you must prepare the
unit by setting its control port parameters from the front panel.

Preparing Supervisory Terminal

Before preparing the supervisory terminal, you have to configure the CONTROL
DCE port for the control session.
➤ To prepare HTU-2 for remote supervisory terminal control:
1. Scroll to SP PARAMETERS in the top row of the front panel LCD.
2. Set the speed, data rate, parity, interface, and management mode parameters
for the control port.

2 Configuring HTU-2
HTU-2 Installation and Operation Manual Quick Start Guide

➤ To configure the terminal:

1. Select full-duplex mode.
2. Turn the terminal echo off.
3. Disable any type of flow control.

Configuring HTU-2 from a Supervisory Terminal

➤ To configure HTU-2 from a supervisory terminal:
1. Connect the terminal to the CONTROL DCE port of HTU-2.
2. If the terminal displays the password prompt PASSWORD>, enter the
password. The default password is HTU. If the node number of HTU-2 is a
number other than zero, enter the node number along with the password. Use
the following syntax:
NODE<Space>’node number’<Space>’password’<Enter>
The prompt HTU-2> appears.
If password protection is not enabled, the HTU-2> prompt appears at the
beginning of the session.
3. Use the command DEF TERM to select the terminal type. The default terminal
type is VT-100. The other type options are VT-52, TV-920, FREEDOM-100,
and FREEDOM-220. Use the following syntax to set the terminal type:
DEF TERM<Space>‘terminal type’<Enter>
Note If you enter DEF TERM without the terminal type, HTU-2 resets all the control
terminal codes to 0.

If your terminal requires control sequences different from those used by the
terminals listed above, type the command F and enter your terminal control
sequences. If the current control codes are not compatible with your terminal
and you cannot enter the desired codes, enter the INIT F command to reset
the codes to 0, then use the F command to modify the control codes starting
from the known field values.
4. Use the additional CONTROL DCE port parameters using the DEF SP
command: password protection, idle disconnect time etc.
5. Set the system parameters by entering the DEF SYS command.
6. Set the data channel parameters by entering the DEF CH command.
7. If you are using an SNMP management or a Telnet application, configure the
SNMP agent parameters by entering the DEF AGENT command.
8. If you are using the terminal to control a single HTU-2 unit, do not change the
node number 0 assigned to the unit. For multidrop operation, you can assign
each HTU-2 unit a node number between 1 and 255. Use the DEF NODE
command to assign a node number.

Configuring HTU-2 3
Quick Start Guide HTU-2 Installation and Operation Manual

9. You can assign each HTU-2 unit a logical name of up to eight characters. The
logical name helps identify the source of alarm messages that HTU-2 sends to
the supervision terminal. Use the DEF NAME command to assign a logical
name.
10. To reset HTU-2, use the RESET command.
11. To reset a configuration of HTU-2 to default values, use the INIT DB
command.
Note The RESET and the INIT DB commands cause HTU-2 to initialize, disrupting traffic
through HTU-2 until it resumes normal operation.

Tips • Use the HELP command to display the correct syntax of commands.
• It is usually sufficient to configure the central unit only, in which case the
central unit configuration parameters are automatically downloaded to the
remote unit. The configuration downloading may take up to 20 seconds.

4 Configuring HTU-2
 Contents

Chapter 1. Introduction
1.1 Overview .......................................................................................................... 1-1
General ...................................................................................................................1-1
Versions...................................................................................................................1-1
Applications.............................................................................................................1-2
Features...................................................................................................................1-3
1.2 Physical Description .......................................................................................... 1-4
1.3 Functional Description ...................................................................................... 1-5
Data Channel Characteristics ...................................................................................1-5
HDSL Subsystem Characteristics ..............................................................................1-5
Management ...........................................................................................................1-6
System Timing .........................................................................................................1-8
Remote Power Feeding............................................................................................1-9
1.4 Technical Specifications .................................................................................. 1-10

Chapter 2. Installation and Setup

2.1 Site Requirements and Prerequisites.................................................................. 2-1
2.2 Package Contents.............................................................................................. 2-1
2.3 Installation and Setup........................................................................................ 2-2
Setting the Internal Jumpers and Switches ................................................................2-2
Connecting the Interfaces ........................................................................................2-5
Connecting the Power .............................................................................................2-7

Chapter 3. Operation
3.1 Front Panel Controls, Connectors and Indicators ............................................... 3-1
3.2 Controlling HTU-2 Operation ........................................................................... 3-2
General ...................................................................................................................3-2
Organization of the LCD ..........................................................................................3-3
Information Displayed on the LCD...........................................................................3-4
Using Front-Panel Buttons........................................................................................3-5
3.3 Operating Instructions....................................................................................... 3-6
Turning HTU-2 On ..................................................................................................3-6
Checking the Current Operating Configuration.........................................................3-7
Normal Indications ..................................................................................................3-8
Monitoring HTU-2 Performance ..............................................................................3-8
Turning HTU-2 Off ..................................................................................................3-8
3.4 Supervisory Terminal Characteristics ................................................................. 3-9
Telnet (IP) Host Characteristics .................................................................................3-9
Control Port Interface Characteristics........................................................................3-9
Modems ..................................................................................................................3-9
Control Port Handshaking Protocol ..........................................................................3-9
AUTOBAUD Function ...........................................................................................3-11
3.5 Preliminary Settings for Initial Configuration Session........................................ 3-12
Configuring the Control Terminal ...........................................................................3-12
Configuring HTU-2 for the Terminal Management Session......................................3-12

HTU-2 Installation and Operation Manual i

Table of Contents

3.6 Running a Supervisory Terminal Management Session..................................... 3-13

Starting a Control Session.......................................................................................3-13
Entering Commands...............................................................................................3-14
Troubleshooting Command Entry ...........................................................................3-15
Ending a Control Session........................................................................................3-15
3.7 HTU-2 Command Language ........................................................................... 3-16
Command Options ................................................................................................3-16
Index of Commands ..............................................................................................3-16
3.8 HTU-2 Management Activities ........................................................................ 3-19

Chapter 4. Configuration Procedures

4.1 General............................................................................................................. 4-1
Conventions ............................................................................................................4-1
4.2 Configuring HTU-2 Working Opposite HTU-2 .................................................. 4-2
Preliminary Configuration of the Central HTU-2 .......................................................4-3
Configuring System and Data Channel Parameters via the Front Panel ......................4-3
Configuring System and Data Channel Parameters via Supervisory Terminal .............4-4
4.3 Configuring HTU-2 Working Opposite HTU-E1 ................................................ 4-5
Configuring HTU-2 to Transfer Full E1 Data .............................................................4-5
Configuring HTU-2 to Transfer Fractional E1 Data ....................................................4-6

Chapter 5. Troubleshooting and Diagnostics

5.1 Status Indications and Alarms ............................................................................ 5-1
Power-Up Self-Test ..................................................................................................5-1
Front-Panel LEDs .....................................................................................................5-1
Alarms .....................................................................................................................5-2
H-RPT Alarms ..........................................................................................................5-2
Working with Alarm Buffer.....................................................................................5-10
Configuration Error Messages .................................................................................5-11
General Troubleshooting........................................................................................5-12
5.2 Performance Diagnostics Data......................................................................... 5-14
General .................................................................................................................5-14
Displaying the Performance Data on the Front Panel LCD ......................................5-14
Displaying the Performance Data on a Control Terminal.........................................5-14
Performance Monitoring Parameters ......................................................................5-15
5.3 Diagnostic Tests .............................................................................................. 5-16
Operating Loopbacks from the Front Panel ............................................................5-16
Activating the Diagnostic Loops from a Supervisory Terminal..................................5-17
Loopback Test Descriptions ...................................................................................5-17

Appendix A. Connector Wiring

Appendix B. IR-ETH Interface Module
Appendix C. IR-ETH/Q Interface Module
Appendix D. IR-IP Interface Module
Appendix E. IR-X21B Interface Module
Appendix F. IR-E1 2048 kbps Unframed Interface Module
Appendix G. Parameters and Terminal Commands
Appendix H. SNMP Management
Appendix I. Operating Environment

ii HTU-2 Installation and Operation Manual

 Table of Contents

List of Figures
1-1. Typical Application of HTU-2 with Serial Data Interface ............................................ 1-2
1-2. Remote Power Feed Application ............................................................................... 1-2
1-3. Central Site SNMP Management Application............................................................. 1-2
1-4. HTU-2, 3D View ....................................................................................................... 1-4
1-5. HTU-2/PF, 3D View .................................................................................................. 1-4
1-6. Flow of Timing Signals through HTU-2 System in the External Timing Mode.............. 1-8
1-7. Flow of Timing Signals through HTU-2 System in the Internal Timing Mode .............. 1-9
1-8. Remote Power Feeding Method .............................................................................. 1-10

2-1. HTU-2 Board Layout ................................................................................................. 2-3

2-2. HTU-2 Rear Panel (AC-Powered Unit)....................................................................... 2-5
2-3. HTU-2/PF Rear Panel (AC-Powered Unit).................................................................. 2-5
2-4. HTU-2/P Rear Panel (Phantom-Fed Unit) .................................................................. 2-5

3-1. HTU-2 Front Panel.................................................................................................... 3-1

4-1. HTU-2 Operating Opposite Another HTU-2 ............................................................. 4-2

5-1. LOCAL CH Loopback.............................................................................................. 5-18

5-2. LOCAL HRPT Loopback.......................................................................................... 5-19
5-3. LOCAL LINE Loopback ........................................................................................... 5-19
5-4. REM CH Loopback.................................................................................................. 5-20
5-5. REM REM CH Loopback ......................................................................................... 5-20

List of Tables
1-1. Operation Ranges...................................................................................................... 1-6

2-1. HTU-2 Jumper Settings.............................................................................................. 2-3

2-2. DCE Interface and Matching Cables .......................................................................... 2-6

3-1. HTU-2 Controls, Connectors and Indicators .............................................................. 3-2

3-2. Front Panel Parameters.............................................................................................. 3-3
3-3. Control Port Handshaking Protocol ......................................................................... 3-10
3-4. Control Port Parameters for Supervisory Port Management ...................................... 3-12
3-5. Command Options.................................................................................................. 3-16
3-6. HTU-2 Command Set Index.................................................................................... 3-16
3-7. Defining Configuration Parameters .......................................................................... 3-19
3-8. Displaying Alarms, Performance Statistics and Current Settings ................................ 3-21
3-9. Activating Loopbacks............................................................................................... 3-22
3-10. Deactivating Loopbacks and Clearing Alarms......................................................... 3-23
3-11. Exiting the Control Session and Resetting HTU-2 ................................................... 3-23

5-1. HTU-2 Alarm Buffer Messages................................................................................... 5-3

5-2. H-RPT Alarm Buffer Messages ................................................................................... 5-8
5-3. Configuration Error Messages................................................................................... 5-11
5-4. Troubleshooting Chart ............................................................................................. 5-12
5-5. Performance Monitoring Parameters........................................................................ 5-15
5-6. Loopback Tests........................................................................................................ 5-17

HTU-2 Installation and Operation Manual iii

Table of Contents

iv HTU-2 Installation and Operation Manual

 Chapter 1
Introduction
1.1 Overview

General
HTU-2 is a standalone HDSL NTU (Network Termination Unit) / LTU (Line
Termination Unit) that enables the transmission of up to 2048 kbps data streams
over two unconditioned twisted-pair lines, using the High Bit Rate Digital
Subscriber Line (HDSL) technology.
The HDSL technology offers a cost-effective and reliable solution for delivering
high-speed data to the subscriber premises over the existing copper cables and
subscriber loops of the local distribution plant, while eliminating repeaters.
HTU-2 extends the range of digital equipment, using HDSL technology up to
4.8 km over 24 AWG (0.5 mm), 4-wire copper cable. HTU-2 eliminates the need
for repeaters or optical cable in the last mile (local loop) or in the campus network
environment.
However, if necessary, HTU-2 can work with an HDSL repeater (H-RPT) on the
main link and achieve a range of up to 9.2 km over 24 AWG (0.5 mm), 4-wire
copper cable between the LTU and NTU. HTU-2 can check the H-RPT alarm
messages and activate/deactivate the local loopback on H-RPT (LOOP L HRPT).
HTU-2 complies with the requirements of the ETSI TR-152, and can transmit full
duplex over two twisted-pair loops. It meets the margin requirements over all the
DLL (Digital Local Line) physical model loops according to ETSI TR-152.
Versions
HTU-2 is part of a family of HDSL transmission equipment offered by RAD, which
also includes:
• HTU-2, standard standalone HDSL data modem
• HTU-2/PF, standalone HDSL data modem with power feeding option.
HTU-2/PF has a larger case to include phantom power-feeding module
• HTU-2C, HDSL data modem card for installation in the LRS-24 rack with
SNMP management
• HTU-2C/P, HDSL data modem card with power feeding option for installation
in the LRS-24 rack
• HTU-2/P, standalone HDSL data modem, equipped with a module for
receiving remote power feed from HTU-2/PF or HTU-2C/P.

Power Supply Versions

HTU-2 is available in AC (100V to 240V) and DC (-48V) versions.

Overview 1-1
Chapter 1 Introduction HTU-2 Installation and Operation Manual

Note In this manual, the generic term HTU-2 is used when the information is applicable
to all HTU-2 versions. Information applicable to a specific version is explicitly
identified.

Applications
Figure 1-1 shows a typical point-to-point application of HTU-2 with serial data
interface.

Central Office/POP Customer Premises

V.35 HDSL Line V.35

n x 64 kbps 4.8 km n x 64 kbps

or Central HTU-2 Remote HTU-2 or
n x 56 kbps n x 56 kbps

Figure 1-1. Typical Application of HTU-2 with Serial Data Interface

Figure 1-2 illustrates the remote power feed application, where the standalone
HTU-2/PF provides phantom feed to the H-RPT repeater.

Central Office/POP Customer Premises

V.35 V.35

n x 64 kbps n x 64 kbps
or Central HTU-2/PF H-RPT Remote HTU-2 or
n x 56 kbps (Phantom-Fed) n x 56 kbps

9.2 km

Figure 1-2. Remote Power Feed Application

Figure 1-3 shows a central site application, where the SNMP-based network
management station manages the HTU-2C cards installed in the local LRS-24 rack
and remote HTU-2 standalone units. In addition, the HTU-2C/P card supplies
power to the remote HTU-2/P standalone modem.

Central Office/POP Local Loop

Customer Premises

LRS-24
HDSL
4.8 km
Public HTU-2/P
Network (Phantom-Fed)

HTU-2C/P
HTU-2C

HDSL X.21
4.8 km
HTU-2 Router
LRS-PS-FEED
SNMP
Management
Station

Figure 1-3. Central Site SNMP Management Application

1-2 Overview
HTU-2 Installation and Operation Manual Chapter 1 Introduction

Features
Timeslot Handling
HTU-2 supports two “ bundle” routing modes, called “ sequential bundling” and
“alternate bundling” . In the sequential mode, the data received from the DTE
interface is placed in one “ bundle” (group of consecutive HDSL timeslots of the
main link, identified by the number of the starting timeslot and the total number of
timeslots. For example: 1, 2, 3, 4, 5 etc). In the alternate mode, the data is placed
into the main link timeslots in the following way: 1, 3, 5, 7 etc.

Priority Bumping
HTU-2 will continue working (at a half of its baud rate) even if one of its HDSL
lines is down. The priority bumping feature allows the user to select the main link
timeslot priority (high or low) in this case. The timeslots which have been assigned
high priority will continue being sent on the remaining HDSL line. Priority
bumping is available only in the framed mode.

Statistics Collection
HTU-2 supports collection of the HDSL performance statistics. It stores
performance statistics for each of the two HDSL lines in compliance with the
requirements of ITU G.826.

LEDs and Alarms

HTU-2 responds to any alarm detected during its operation by an alarm message and
stores it in a buffer that can hold up to 100 messages. A front panel LED indicator
lights when the alarm buffer contains alarm messages. The local operator can then
review the contents of the alarm buffer on the front panel display, or from an ASCII
terminal connected to the supervisory port.
In addition to the alarm buffer, front-panel LED indicators display in real time the
status of the HTU-2 data channel and the HDSL lines, and alert when test
loopbacks are present in the system. The status of LAN lines in the case of the
Ethernet version is indicated by the Ethernet interface module LEDs located on the
HTU-2 rear panel.

Test and Diagnostics Capabilities

HTU-2 has comprehensive diagnostics capabilities that include the following
loopbacks:
• Local loopback on the data channel of the local HTU-2
• Local loopbacks on the two HDSL lines
• Remote loopback on the data channel of the local HTU-2
• Remote loopback on the data channel of the remote unit
• H-RPT local loopback (towards the HTU-2 configured as central) when
working with the HDSL repeater.
Maintenance is further enhanced by advanced power-up self-test capabilities, and
by an automatically performed cyclic self-test that provides circuit-level diagnostics
data.

Overview 1-3
Chapter 1 Introduction HTU-2 Installation and Operation Manual

HTU-2 can identify the type of the unit at the remote end of the HDSL link and
provides the user with a possibility to read the diagnostic data of the remote unit
through the HDSL link.

1.2 Physical Description

HTU-2 is a compact unit, intended for installation on desktops or shelves. The unit
height is 1U (1.75 in).
Optional rack-mount adapter kits are available for installation in a 19-inch rack:
• RM-17 for installation of one or two HTU-2 units
• RM-7/NEW for installation of one HTU-2/PF unit.
Figure 1-4 and Figure 1-5 provide 3D views of HTU-2 and HTU-2/PF, respectively.

Figure 1-4. HTU-2, 3D View

Figure 1-5. HTU-2/PF, 3D View

The front panel provides control over the unit operation. The LEDs provide
real-time indications of the operation and status of the unit.
The LCD and three buttons are used to display status (alarm) messages, diagnostics
and performance monitoring data, test status and configuration parameters of
HTU-2. You can also use the LCD and buttons to configure the unit. For details,
refer to Chapter 3 and Chapter 4.
The rear panel of the unit allows access to the data port, HDSL line and power
connections. For details, refer to Chapter 2.

1-4 Physical Description

HTU-2 Installation and Operation Manual Chapter 1 Introduction

1.3 Functional Description

Data Channel Characteristics

The data channel can support data rates which are integer multiples of 64 kbps or
56 kbps, up to a maximum of 2048 kbps. The user can select the timeslots of the
HDSL frames that will carry the data payload.
Three selection modes are available:
• Sequential allocation, starting from a user-selected timeslot.
• Alternate allocation, starting from a user-selected timeslot.
• User-controlled mapping, which enables the selection of individual timeslots to
carry the payload.

The HTU-2 data channel port supports the following synchronous and Ethernet
interfaces:
• V.35
• X.21
• RS-530
• V.36/RS-449
• G.703 (2048 kbps)
• IR-ETH, internal Ethernet bridge
• IR-ETH/Q, internal Ethernet bridge with VLAN support
• IR-IP, IP router.

The data channel interface operates as a DCE interface, and supports two timing
options:
• Internal timing: the HTU-2 data port provides transmit and receive clock to
the equipment connected to the port.
• External timing: the equipment connected to the HTU-2 provides the transmit
clock to the data port, and HTU-2 returns a receive clock locked to the
external transmit clock.

HDSL Subsystem Characteristics

The HTU-2 HDSL subsystem uses dual duplex transmission over two 2-wire lines.
The line code on the HDSL lines is 2B1Q at a rate of 584 kbaud (equivalent to a
data transfer rate of 1168 kbps).
Using advanced equalization, adaptive filtering, and echo cancellation techniques,
HTU-2 compensates for line impairments, bridged taps, and mixed cables
commonly encountered in the local distribution network. Moreover, due to its
high immunity to background noise, HTU-2 enables the transmission of multiple
HDSL signals in the same physical cable without requiring pair selection.

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Chapter 1 Introduction HTU-2 Installation and Operation Manual

HTU-2 can operate on unloaded AWG-22, AWG-24, and AWG-26

twisted-wire pairs, and other similar pairs, tolerating up to two bridged taps, with a
length of up to 500m.

Table 1-1. Operation Ranges

AWG-24 AWG-26
km miles km miles
Without H-RPT
4.8 3.0 3.8 2.4
With H-RPT
9.2 5.7 7.2 4.5

The HDSL line interfaces are terminated in an RJ-45 eight-pin female connector.
The transmission of data on each twisted-wire pair (HDSL line) is full duplex, and
except for the distribution of payload data bits between the two lines, each HDSL
line operates independently.
HTU-2 provides an embedded operations channel (EOC) within the HDSL data
streams, which enables end-to-end system management and supervision.
The HDSL subsystem operates in a master-slave mode.
The master unit, called line termination unit (LTU), determines the distribution of
payload data between the HDSL lines, controls the system start-up procedure,
provides the timing reference for HDSL line transmission, and manages the
communication on the EOC.
The slave unit, located at the remote end of the link, is called network termination
unit (NTU).
HTU-2 supports both the central (LTU) and the remote (NTU) operating modes;
the actual operating mode (LTU or NTU) is user-selectable.

Management
Local Control
HTU-2 is designed for unattended operation. HTU-2 configuration, that is, the
complete collection of its operating parameters, is determined by a database
stored in non-volatile memory. The database parameters and the operation of
HTU-2 can be controlled by means of a simple menu, operated by buttons located
on the front panel.
During setup, the LCD display guides the operator in the execution of the desired
operations. The display provides information concerning the current system
configuration and operating mode, and the available values of each programmable
parameter. In case of operator errors, HTU-2 displays the configuration error
number, which helps the operator take the correct action.

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HTU-2 Installation and Operation Manual Chapter 1 Introduction

Remote Management
In addition to front panel control, HTU-2 supports management from a remote
location. The remote management capabilities can be used to configure the
HTU-2 parameters and display status (alarm) messages, diagnostics information,
performance monitoring data, and the test status.
These functions are performed through a serial V.24/RS-232 port that enables
serial communication with a supervisory terminal.
Using the serial V.24/RS-232 port, the user can also enable remote management
using IP communications, i.e., Telnet and SNMP. The IP communication uses the
Serial Link Internet Protocol (SLIP).
If you have an H-RPT on your link, you can use either SP or Telnet management to
display the status messages of H-RPT and, if your application allows this,
activate/deactivate the H-RPT loopback (from the unit configured as Central). For
the description of the H-RPT loopback and how to operate it, refer to Chapter 5.
Brief information on these three management capabilities is given below.
Note Support for Telnet and SNMP is available for HTU-2 with software version 1.0 and
higher. If your HTU-2 does not support Telnet and SNMP, contact RAD Technical
Support Department for upgrade information.
Management by means of a supervision terminal. Any “ dumb” ASCII terminal
connected to the CONTROL DCE port of HTU-2 (or a PC running a terminal
emulation program), controlled by the program stored in the HTU-2, can be used
as a supervision terminal.
The supervision terminal can communicate with HTU-2 using either point-to-point
or polled (multidrop) communication. For polling purposes, each HTU-2 can be
assigned an eight-bit address, for a maximum of 255 nodes (the zero address is
reserved).
As an option, you can connect a dial-up modem to the control port, to provide
call-in and call-out capabilities.
In addition to the remote management functions listed above, the supervision
terminal is also used for the preliminary configuration of HTU-2, to enable the use
of IP communication for Telnet and SNMP management.
Management by means of Telnet. HTU-2 also supports the Telnet protocol, which
enables remote management using the same command line interface available
with a supervision terminal. Telnet uses TCP/IP communication through the
CONTROL DCE port of HTU-2.
SNMP management. The SNMP management capability enables fully graphical,
user-friendly management using the RADview network management stations
offered by RAD, as well as management by other SNMP-based management
systems.

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Chapter 1 Introduction HTU-2 Installation and Operation Manual

Control of Remote Unit from Central Unit

As described above, the operation of the HTU-2 system is basically asymmetrical;
i.e., the HDSL subsystem inherently operates in a central (master)/remote (slave)
mode. HTU-2 takes advantage of this characteristic to expedite the configuration,
management and supervision tasks related to the remote unit.
All the parameters that determine the end-to-end system performance can be
configured on the central unit only. They are automatically transferred
(downloaded) from the HTU-2 configured as central to the unit configured as
remote, using the EOC. The user of the local unit configured as central can also
initiate tests on the unit configured as remote.
Using the remote management, the user of the local unit can read and clear
through the EOC the alarm messages and performance parameters of the unit at
the remote site.
Thus, an HTU-2 configured as central unit serves as a full-function proxy agent for
the remote unit with respect to all the management methods (LCD, supervision
terminal, Telnet, and SNMP).

System Timing
HTU-2 offers selectable timing options, which enable the distribution of timing
over the HDSL system, from the central office to the remote end. The use of
stuffing on the HDSL subsystem ensures that the DTE signal provided to the
customer equipment by the remote unit is locked to the timing of the DTE signal
received by the central unit.

HTU-2 Configured as Central Unit (LTU)

The HTU-2 unit configured as LTU has two timing modes: external timing and
internal timing.
With external timing, the HTU-2 system timing is locked to the transmit clock
signal supplied to the data port (this mode is not supported when HTU-2 is
equipped with an Ethernet interface). When HTU-2 is connected to a data
network, which usually has its own high-accuracy timing source, the external
timing mode enables locking the system timing to the accurate network timing.
Figure 1-6 shows the flow of timing signals through the HTU-2 system in the
external timing mode.
Central HTU-2 Remote Unit

HDSL Line A HDSL HDSL Line A

Interface Line A Interface

Customer
Data DCE DCE
Side
Network Interface Interface
(DTE)

HDSL Line B HDSL HDSL Line B

Interface Line B Interface

Figure 1-6. Flow of Timing Signals through HTU-2 System in the External Timing Mode

1-8 Functional Description

HTU-2 Installation and Operation Manual Chapter 1 Introduction

With internal timing, the HTU-2 system timing is determined by the clock signal
generated by an internal crystal oscillator shows the flow of timing signals through
the HTU-2 system in the internal timing mode.

Central HTU-2 Remote Unit

Internal
Timing HDSL Line A HDSL HDSL Line A
Interface Line A Interface

Data DCE Customer

DCE
Equipment Interface Side
Interface
(DTE)

HDSL Line B HDSL HDSL Line B

Interface Line B Interface

Figure 1-7. Flow of Timing Signals through HTU-2 System in the Internal Timing Mode

HTU-2 Configured as Remote Unit (NTU)

The HTU-2 unit configured as NTU always locks its internal system timing to the
incoming HDSL signals, that is, to the timing of the unit configured as central. The
timing is derived from the clock signal recovered from line A; if line A fails, HTU-2
automatically switches to the clock signal recovered from line B.
Remote Power Feeding
The phantom-fed HTU-2/P version operates only in a link with the HTU-2C/P card
for LRS-24 rack or HTU-2/PF, which can provide the required feed voltage
through the HDSL lines. The phantom power-feeding circuits of the standalone
HTU-2/PF unit generate the required voltage. The C/P cards receive the feed
voltage from a special-purpose standalone power supply unit, LRS-PS-FEED,
connected to the LRS-24 modem rack.
The LRS-PS-FEED is connected to the LRS-24 power supply interface module (such
as LRSI-F-PSP/230/115), as shown in Figure 1-3.
The remote feed voltage is routed through the remote feeding interface (a
dedicated daughter board located on the HTU-2C/P card or internal
phantom-feed module of the standalone HTU-2/PF) to the HDSL lines. HTU-2/P
separates the DC voltage as shown in Figure 1-8, and routes it to its power supply
subsystem.

Functional Description 1-9

Chapter 1 Introduction HTU-2 Installation and Operation Manual

C/P Module HDSL Loop HDSL HTU-2/P

Line Trafo Resistance Line Trafo

Line A

HTU-2/ Power
LRS-12-F Max 120 VDC Supply
Board Module

HDSL HDSL
Line Trafo Line Trafo

Regulated
Voltages
to Local
Line B Circuits

120 VDC from

LRS-PS-FEED

Figure 1-8. Remote Power Feeding Method

The LRS-PS-FEED provides a feed current in accordance with the cable type and
distance (nominally 60 mA), balanced and floating with respect to ground. The
output voltage varies as a function of line resistance: the maximum output voltage
across the HDSL lines is 120 VDC.
Phantom power feeding does not limit the HTU-2 operational range.

1.4 Technical Specifications

HDSL Compliance ETSI TR-152
Interface
Signal Format Dual duplex, 2B1Q line coding
Line Baud Rate 584 kbaud (equivalent to 1168 kbps), for each pair
Line Type Two unconditioned, unloaded twisted pairs
Impedance 135Ω
Transmit Pulse As per ETSI TR-152
Shape
Transmit Signal +13.5 dBm ± 0.5 dBm
Power
Loop Loss 27 dB max at 150 kHz (584 kbaud)

1-10 Technical Specifications

HTU-2 Installation and Operation Manual Chapter 1 Introduction

Range Without H-RPT:

• 3.8 km (2.4 miles) for 26 AWG (0.4 mm)
• 4.8 km (3.0 miles) for 24 AWG (0.5 mm)
With H-RPT:
• 7.2 km (5.7 miles) for 26 AWG (0.4 mm)
• 9.2 km (4.5 miles) for 24 AWG (0.5 mm)
Return Loss 16 dB minimum, 25 kHz to 317 kHz @ 135Ω
Differential Line Maximum 50 µs at 150 kHz
Delay
Equalizer Automatic adaptive
Connector RJ-45
Data Channel Data Rate Multiples of 56 or 64 kbps, up to 1.792 Mbps or
Interface 2.048 Mbps, respectively
Types • V.35: 34-pin female
• X.21: 15-pin D-type female
• RS-530: 25-pin D-type female
• V.36/RS-449: 37-pin D-type female (via adapter
cable)
• G.703 (2048 kbps): RJ-45 (balanced) and BNC
(unbalanced)
• IR-ETH: RJ-45 (10BaseT) or BNC (10Base2)
• IR-ETH/Q: RJ-45 (10BaseT)
• IR-IP: RJ-45
HDSL Per ITU G.826
Performance
Statistics
Front Panel LCD 2 rows × 16 characters
Controls
Buttons CURSOR, SCROLL, ENTER
Indicators Data Channel TD
RD
Ethernet rear-panel LEDs (IR-ETH, IR-ETH/Q or IR-IP
only)
HDSL Lines HDSL LOS - LINE A
HDSL LOS - LINE B
Status TST
ALM

Technical Specifications 1-11

Chapter 1 Introduction HTU-2 Installation and Operation Manual

Diagnostics Loopbacks • Local loopback on the data channel of the local HTU-2
• Local loopbacks on two HDSL lines
• Remote loopback on the data channel of the local
HTU-2
• Remote loopback on the E1 port or data channel of
the remote unit
• H-RPT local line loopback towards the
LTU-configured unit (available in applications with
H-RPT)
Timing Central Unit • Internal timing, derived from local oscillator
• External timing, locked to data port transmit clock
signal
Remote Unit Derived from incoming HDSL receive clock
Control Port Interface V.24/RS-232, asynchronous DCE interface for direct
connection of supervisory terminal or dial-up modem
Data Rate 300, 1200, 2400, 4800, 9600 bps, with Autobaud
option
Word Format • One start bit
• 7 or 8 data bits
• Parity: none, odd, or even
• One stop bit
Connector 9-pin D-type, female
Physical HTU-2
Height 44 mm / 1.75 in (1U)
Width 215 mm / 8.5 in
Depth 243 mm / 9.5 in
Weight 1.5 kg / 3.5 lb
HTU-2/PF
Height 44 mm / 1.75 in (1U)
Width 432 mm / 17 in
Depth 260 mm / 10.2 in
Weight 2.1 kg / 4.6 lb
Power AC Source 100 to 240 VAC, 50 or 60 Hz
DC Source -48 VDC (-36 to -72 VDC)
Environment Operating 0 to 50°C (32 to 122°F)
Temperature
Relative Humidity Up to 90%, non-condensing

1-12 Technical Specifications

 Chapter 2
Installation and Setup
HTU-2 is delivered completely assembled. It is designed for installation as a
desktop unit or for mounting in a 19-inch rack. For rack installation instructions,
refer to the Rack Mounting Kit for 19-inch Racks guide that comes with the RM kit.
After installing the unit:
• Refer to Chapter 3 for instructions on operating HTU-2.
• Refer to Chapter 4 for detailed system configuration procedures for the typical
HTU-2 applications.

Refer to Chapter 5 for troubleshooting and diagnostics information.

Internal settings, adjustment, maintenance, and repairs may be performed

only by a skilled technician who is aware of the hazards involved.
Always observe standard safety precautions during installation, operation and
Warning maintenance of this product.

2.1 Site Requirements and Prerequisites

AC-powered HTU-2 units should be installed within 1.5m (5 ft) of an
easily-accessible grounded AC outlet capable of furnishing the required supply
voltage, in the range of 100 to 240 VAC.
DC-powered HTU-2 units require a -48 VDC power source, which must be
adequately isolated from the mains supply. In order to prevent a fire hazard, a
suitable fuse must be installed in the -48 VDC line.
Allow at least 90 cm (36 in) of frontal clearance for operator access and at least
10 cm (4 in) clearance at the rear of the unit for interface cable connections.
Caution Do not stack units one on top of another.

The ambient operating temperature of HTU-2 should be 0 to 50°C (32 to 122°F),

at a relative humidity of up to 90%, non-condensing.

2.2 Package Contents

The HTU-2 package includes the following items:
• HTU-2 unit
• HTU-2 Installation and Operation Manual
• AC power cord or DC power supply connector kit

Package Contents 2-1

Chapter 2 Installation and Setup HTU-2 Installation and Operation Manual

2.3 Installation and Setup

To install HTU-2, you must perform the following (in the given order):
• Determine the required configuration of HTU-2, according to your
application, and set the internal jumpers accordingly.
• Connect the data channel port, the HDSL lines and the control port, if
necessary (see appropriate section below).
• Connect power to the unit.

Setting the Internal Jumpers and Switches

This section provides information on the functions of the HTU-2 jumpers and
switches, which are located on the modem's printed circuit board, as seen in
Figure 2-1. Table 2-1 lists the functions of the jumpers and switches.

Access to the inside of the HTU-2 equipment is permitted only to authorized

and qualified service personnel.
To avoid accidental electric shock, always disconnect the interface cables and
Warning
the power cord before removing the unit from its casing.
Line voltages are present inside HTU-2 when it is connected to power and/or
to the lines. Moreover, under external fault conditions dangerous voltages may
appear on the lines connected to the unit.
The DC-powered units may contain fuses on both positive and negative supply
lines.
Any adjustment, maintenance, and repair of the opened equipment under
voltage should be avoided as much as possible and, when absolutely
necessary, should be carried out only by a skilled technician who is aware of
the hazard involved. Capacitors inside the instrument may still be charged
even after the instrument has been disconnected from its source of supply.

Caution HTU-2 contains components sensitive to electrostatic discharge (ESD). To prevent

ESD damage, avoid touching the internal components. Before moving jumpers,
touch the HTU-2 rear panel.

➤ To open the HTU-2 case:

1. Disconnect all the cables connected to HTU-2.
2. Turn the unit over (bottom facing up).
3. Unscrew the four cover screws and keep them in a safe place.
4. Turn the unit over (bottom facing down).
5. Remove the HTU-2 top cover by pulling it straight up.
➤ To open the HTU-2/PF case:
1. Disconnect all the cables connected to HTU-2/PF.
2. Loosen the two cover screws located at the rear panel of the unit.
3. Slide out the top cover to gain access to the unit interior.

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 HTU-2 Installation and Operation Manual Chapter 2 Installation and Setup

Power
Connector
HDSL
Connector

Interface
Board

Power
Supply

S1

DB INT
DEF SP
PASSWD
JP1
ON
C
R

JP15
FGND/GND
ON
OFF

Figure 2-1. HTU-2 Board Layout

Table 2-1. HTU-2 Jumper Settings

Jumper/Switch Description Values Factory Setting

S1 DIP Switch
DB INIT, Selects the source of the database ON – HTU-2 uses the default
section 2 configuration parameters parameters stored in its
EPROM. For the default
values, see Table G-14.
OFF – HTU-2 uses the user-selected OFF
parameters stored in the
database.
Note: HTU-2 is delivered with the database loaded with the default parameters. If needed, you can move the
switch to the ON position again, to reload the database and restart HTU-2 with the default parameters.
For the detailed description of the HTU-2 configuration procedure, refer to Chapter 4.

Installation and Setup 2-3

 Chapter 2 Installation and Setup HTU-2 Installation and Operation Manual

Table 2-1. HTU-2 Jumper Settings (Cont.)

Jumper/Switch Description Values Factory Setting

DEF SP, Selects the source of the ON – HTU-2 uses the default control
section 3 supervisory port parameters port parameters stored in the
EPROM. For the default
values, see Table G-3.
OFF – HTU-2 uses the control port OFF
parameters stored in the
database.
PASSWD, Controls the use of the default ON – HTU-2 uses the default
section 4 password. password (HTU).
To prevent unauthorized personnel OFF – HTU-2 uses the user-selected OFF
from using the HTU-2 supervision password.
program, you can use password
protection with a password,
consisting of up to eight
alphanumeric characters. HTU-2 is
delivered with a default password,
HTU, but normally the password is
selected by the user.
Note: You can make HTU-2 temporarily use default values of the password (control port parameters) without
erasing the user-selected values from the database. To do this, set the PASSWD (DEF SP) section to ON,
leaving DB INIT at OFF and turn the unit on. Then, when you turn HTU-2 off, reset the DEF SP or PASSWD
section to OFF and turn the unit on again, HTU-2 will use the user-selected parameters.
For the detailed description of the HTU-2 configuration procedure, refer to Chapter 4.
R/C jumper, JP1 Selects the function of the HTU-2 C – HTU-2 operates as a central unit C
unit: central or remote (LTU).
R – HTU-2 operates as a remote unit
(NTU).
FGND/GND Controls the connection between ON – Ground is shorted to the frame ON
jumper, JP15 the internal signal ground and the ground.
frame ground. OFF – Ground is not shorted to the
frame ground.

Setting the FGND/GND jumper (JP1) to OFF may make the equipment unsafe
for direct connection to unprotected telecommunication networks at locations
where constant excessive voltages may be present on the lines.
Excessive voltages are those exceeding 60 VAC or 30 VDC.
Warning

After completing the internal settings, reassemble the HTU-2 or HTU-2/PF units, as
follows:
➤ To reassemble HTU-2:
1. Position the lower half of the HTU-2 case on a flat, clean surface. Check that
the decorative black plastic strips on the sides of the unit are still in place (if
not, place the strips in the grooves on the sides of the lower half).

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HTU-2 Installation and Operation Manual Chapter 2 Installation and Setup

2. Identify the front and the rear of the top cover, and position the cover on the
lower half of HTU-2, so that the cover guides are located just above the holes
in the lower half. Close the cover and ensure that the protruding tips of the
cover guides enter the corresponding recesses in the lower half.
3. Hold the cover in place and turn the assembly over, to gain access to the
bottom of the unit.
4. Insert the original cover screws in their positions and tighten carefully. Do not
use excessive torque.
➤ To reassemble HTU-2/PF:
1. Slide the top cover along the grooves of the unit case.
2. Secure the top cover by fastening its screws to the rear panel.

Connecting the Interfaces

Figure 2-2, Figure 2-3 and Figure 2-4 show typical rear panels of a standard HTU-2,
HTU-2/PF, and HTU-2/P units, respectively.

Figure 2-2. HTU-2 Rear Panel (AC-Powered Unit)

CAUTION : FOR C ONTIN UE D

PR OTE CTION AGAIN ST R ISK OF
FIRE , REP LAC E ONLY W ITH SAM E
TYPE AN D RATI NG OF FUSE .

Figure 2-3. HTU-2/PF Rear Panel (AC-Powered Unit)

Figure 2-4. HTU-2/P Rear Panel (Phantom-Fed Unit)

Connecting the Data Port

To connect HTU-2 to the user’s DTE, use a standard cable matching your
modem’s interface, which you can order either from RAD or from another
provider.
Table 2-2 lists the cables available from RAD and describes the type of connector
for each interface.

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Chapter 2 Installation and Setup HTU-2 Installation and Operation Manual

Table 2-2. DCE Interface and Matching Cables

Interface Description RAD Cable

V.35 34-pin, female (see Appendix A for the connector pinout) CBL-HBT/V35
IR-X.21B 15-pin, D-type, female (see Appendix E for a detailed
description of the IR-X21B interface module)
RS-530 25-pin, D-type, female (see Appendix A for the connector CBL-HBT/530
pinout)
V.36/RS-449 37-pin, D-type, female (HTU-2 is supplied with RS-530 CBL-530/449F adapter
interface and adapter cable, which converts the RS-530 cable
interface to V.36. The pinout of the CBL-530/449F adapter
cable appears in Appendix A.
IR-E1 RJ-45, balanced and two BNC, unbalanced (see Appendix F for –
(2048 kbps) a detailed description of the IR-E1 interface module)
IR-ETH RJ-45 or two BNC (see Appendix B for a detailed description of –
the IR-ETH interface module)
IR-ETH/Q RJ-45 (see Appendix C for a detailed description of the –
IR-ETH/Q interface module)
IR-IP RJ-45 (see Appendix D for a detailed description of the IR-IP
interface module)

Note To connect your HTU-2 to a DCE, prepare a special cross-cable in accordance with
your application.

Connecting the HDSL Lines

To connect the remote equipment (HDSL lines) to HTU-2, connect the cable to
the RJ-45 connector designated NETWORK HDSL. Appendix A provides the pin
allocation for this connector.

Connecting the Control Port

Connect a cable prepared in accordance with Appendix A between the control
port connector, designated CONTROL DCE, and the control terminal. If the
supervisory terminal is connected via modems, use a cross-over cable.
Note The various interface cables should be shielded, in order to comply with FCC rules.
HTU-2 and its data interfaces will work well even if the cables are not shielded, but
some radio interference may occur.

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HTU-2 Installation and Operation Manual Chapter 2 Installation and Setup

Connecting the Power

To connect HTU-2 to the power source, refer to the appropriate section below,
depending on your version of the unit (AC, DC, PF).

Before switching on this unit and connecting any other cable, the protective
earth terminals of this unit must be connected to the protective ground
conductor of the mains power cord. If you are using an extension cord (power
Warning cable) make sure it is grounded as well.
Any interruption of the protective (grounding) conductor (inside or outside the
instrument) or disconnecting of the protective earth terminal can make this
unit dangerous. Intentional interruption is prohibited.
For the AC version, make sure that only fuses of the required rating, as marked
on the rear panel, are used for replacement. Do not use repaired fuses or
short-circuit the fuse holder. Always disconnect the mains cable before
removing or replacing the fuse. Whenever it is likely that the fuse protection
has been damaged, make the unit inoperative and secure it against unintended
operation.

Connecting the AC Power

AC power should be supplied to the HTU-2 or HTU-2/PF through the 5 ft (1.5m)
standard power cable terminated by a standard 3-prong plug
(see Figure 2-2 and Figure 2-3). The cable is provided with the unit.
➤ To connect the AC power:
1. Check that the ON/OFF switch on the HTU-2 rear panel is set to OFF.
2. Connect the power cable first to the connector on the HTU-2 rear panel, and
then to the mains outlet.

Connecting the DC Power

➤ To connect the DC power:
• Refer to DC Power Supply Connection Supplement.

Connecting the Phantom Feed

The phantom-fed unit is automatically connected to power as soon as you connect
its HDSL lines.
As seen in Figure 1-8, the supply of power to HTU-2/P is not affected when the
two pairs of an HDSL line are interchanged. However, observe the following
caution.
Caution Do not cross-connect wires between the two pairs, as this will short-circuit the
supply voltage output. Although the power-feeding unit is protected against this
occurrence, the remote HTU-2/P unit will not receive any voltage. Therefore,
when troubleshooting a newly-operational HTU-2/P device, always check first for
the proper line connections.

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Chapter 2 Installation and Setup HTU-2 Installation and Operation Manual

2-8 Installation and Setup

Chapter 3
Operation
This chapter contains detailed instructions for operating HTU-2 from the front
panel. The information presented in this chapter includes:
• HTU-2 front panel – Section 3.1
• General description of HTU-2 control, display and button functions, and menu
organization – Section 3.2
• Operating procedures (turn-on, front-panel indications, performance
monitoring and turn-off) – Section 3.3
• Characteristics of a supervisory terminal (characteristics of the HTU-2 control
port and IP host, description of the control port handshaking protocol) –
Section 3.4.
• Preliminary settings for initial configuration session (settings of the supervisory
terminal and CONTROL DCE port) – Section 3.5
• Instructions on running a supervisory terminal management session –
Section 3.6
• HTU-2 command language (list of HTU-2 commands and their options) –
Section 3.7
• HTU-2 management activities – Section 3.8.

3.1 Front Panel Controls, Connectors and Indicators

Figure 3-1 shows the front panel of HTU-2. Table 3-1 lists the functions of the
controls, connectors and indicators, located on the HTU-2 front panel.

HDSL LOS CONTROL

TD RD LINE A LINE B

ALM TST DCE

CURSOR SCROLL ENTER

Figure 3-1. HTU-2 Front Panel

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Table 3-1. HTU-2 Controls, Connectors and Indicators

Name Type Function

TD LED Indicator ON – Activity is detected on the transmit line of the data channel
RD LED Indicator ON – Activity is detected on the receive line of the data channel
HDSL LOS LED Indicator ON – The HDSL line A (line 1) circuits lose synchronization to the
LINE A incoming signal
HDSL LOS LED Indicator ON – The HDSL line B (line 2) circuits lose synchronization to the
LINE B incoming signal
TST LED Indicator ON – A test is active
ALM LED Indicator ON – An ON-state alarm is stored in the HTU-2 alarm buffer
(see Chapter 5)
Alphanumeric Liquid crystal display (LCD) used to display messages and status
display information. The display contains 2 rows of 16 characters each.
CURSOR Button Moves among the information fields on the LCD
SCROLL Button Scrolls among the available options displayed on the LCD
ENTER Button Confirms the changes made in the HTU-2 operation
CONTROL Connector Connection to supervisory terminal
DCE

3.2 Controlling HTU-2 Operation

General
The HTU-2 operating mode is determined by a set of parameters stored in an
internal non-volatile memory. To select these parameters, you can use the HTU-2
front panel buttons or a control terminal.
After the operating parameters have been loaded (this process is called
configuration setup), HTU-2 no longer requires operator attendance.
The configuration selected by the user and stored in the HTU-2 memory is not
affected when power is turned off. Upon turn-on, HTU-2 checks the validity of the
stored configuration data, and after the self-test loads the last selected
configuration (unless you have changed the default setting of the S1 DIP switch,
section 2, from OFF to ON, as described in Chapter 2). If the configuration does
not require modification, HTU-2 is ready for operation immediately after power is
applied. However, if the configuration data is corrupted, HTU-2 loads a default
configuration instead. The default configuration, prepared by the manufacturer, is
stored in the EPROM.

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All operations are performed using an interactive, menu-driven interface,

controlled by the LCD and three buttons. HTU-2 guides you in the execution of
the required task by means of messages and checks your inputs. Moreover, HTU-2
suggests only those parameter values which are available on your HTU-2 model in
the selected operating mode.
If you make a configuration error (for example, you select a parameter value that
conflicts with the current operating mode), HTU-2 rejects the erroneous selection
and displays an error message that identifies the error.

Organization of the LCD

The HTU-2 display has two rows:
• The upper row shows the header, which can be one of the following:
ƒ ALARM BUFFER
ƒ HDSL DIAG
ƒ TEST OPTION
ƒ Name of one of four configuration parameter groups.
• The lower row displays the following information:
ƒ Parameter name and value
ƒ Status messages
ƒ Loopback name and status
ƒ Error messages
ƒ Diagnostics messages.

Table 3-2 shows the basic LCD menu structure.

Table 3-2. Front Panel Parameters

Top Row Bottom Row Restrictions

ALARM BUFFER SCROLL CLEAR
EMPTY
HDSL DIAG: LINE1 CURR ES ...
L. TERM INT See Table 5-5
TEST OPTION: LOOP LOCAL LINE
LOCAL CH
REM CH
REM REM CH
TEST OPTION: HRPT LOCAL HRPT Only with HTU-2 as central unit
SYSTEM PARAMETER CLK MASTER Only with HTU-2 as central unit
MASTER FUNC
CONFIG REM Only with HTU-2 as central unit
HRPT

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Table 3-2. Front Panel Parameters (Cont.)

Top Row Bottom Row Restrictions

CHANNEL PRM FRAME
MULT
MAP
SPEED
START TS Only when MAP is selected as SEQ or ALT
CTS
ETHER
Only when Ethernet interface is present
BRIDGING
TS_0 to TS_31
SP PARAMETERS SPEED
DATA
PARITY
INTERFACE
AUX DEV Only with HTU-2 as central unit
PB PARAMETERS TS_0 to TS_31

Information Displayed on the LCD

The LCD displays four types of information messages:
• Status messages (alarms)
• Diagnostics and performance monitoring data
• Test status
• Configuration parameters.

Status Messages (Alarms)

When HTU-2 is not being configured and HDSL diagnostics is not in progress, it
displays one of the two screens that appear under the header ALARM BUFFER. If
the alarm buffer contains status messages (ON-state alarms), the LCD second row
shows “SCROLL CLEAR” and the ALM indicator is lit. Otherwise, the ALM LED is
off, and the second row of the LCD shows “EMPTY”.
For the definition of ON-state alarms, list of alarms and instructions how to work
with them, refer to Chapter 5.

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Diagnostics and Performance Monitoring Data

HTU-2 can display the HDSL line performance parameters.
The diagnostics data appears under the header HDSL DIAG. For an explanation of
the diagnostics data parameters and their monitoring, refer to Performance
Diagnostics Data in Chapter 5.

Test Functions
The test functions of HTU-2 include local and remote loopbacks on the data port,
local loopbacks on the HDSL lines, remote loopbacks on the data port of the
remote unit, and a local loopback on the H-RPT (when you are working with the
latter and your HTU-2 is configured as central). The test options appear under the
header TEST OPTION. For a description of the loopback tests and instructions
how to operate them, refer to Diagnostic Tests in Chapter 5.

Configuration Parameters
HTU-2 configuration parameters are divided into the following four groups:
• System parameters (SYSTEM PARAMETER)
• Channel parameters (CHANNEL PRM)
• Control port parameters (SP PARAMETERS)
• Priority bumping parameters (PB PARAMETERS).

Appendix G describes each group of parameters and provides practical

configuration guidelines for individual parameters and parameter groups where
necessary.

Using Front-Panel Buttons

The HTU-2 front panel contains three buttons designated CURSOR, SCROLL and
ENTER. These buttons control the LCD and let you view and change HTU-2
parameters.
Cursor Moves the cursor among the fields in the current display.
Scroll Changes the selected item. Press SCROLL to display the alternatives in the
selected field. Hold SCROLL down to scroll through the options
automatically.
Enter Press ENTER to choose the selected parameter value.
• If the new value is valid, it replaces the old value and the change
takes effect immediately.
• If the new value is not valid, it is not accepted and HTU-2 displays a
CONFIG ERROR message with a two-digit code in the second display
row. After a short time, the error message disappears and HTU-2
returns to the original display. Refer to Configuration Error Messages
in Chapter 5, for a list of error codes and how to correct the errors.

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Additional Functions of ENTER

The ENTER key has two additional functions:
• When the LCD displays the ALARM BUFFER screen, the ENTER key deletes all
the alarms in the buffer.
• When the LCD displays the HDSL DIAG screens, the ENTER key resets the
performance monitoring counter being displayed (refer to Displaying the
Performance Data on the Front Panel LCD in Chapter 5).

Note Pressing ENTER accepts your choice only if the cursor is in the right-hand field of the
second row.

3.3 Operating Instructions

This section covers the following activities:
• Turning HTU-2 on
• Checking the HTU-2 configuration
• Normal HTU-2 operating indications
• Monitoring the HTU-2 performance
• Turning HTU-2 off
• Performing local setup configuration procedure.

Turning HTU-2 On
To turn HTU-2 on, set the rear POWER switch to ON. Upon turn-on, HTU-2
performs a self-test: observe the front-panel indications.
During the self-test, HTU-2 displays its current software revision:

HTU REV 2.2

SELF TEST

After successfully completing the self-test procedure, HTU-2 switches to the

default ALARM BUFFER screen. If HTU-2 fails the self-test, its LCD will display a
description of the fault. In this case, HTU-2 must be repaired before it can be used
again.

Access to the inside of the unit is permitted only to qualified and authorized
personnel.
Warning

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If the configuration data selected by the user and stored in the HTU-2 database is
corrupted, HTU-2 generates the DB CHKSUM ERR alarm message. In this case, it
is necessary to initialize the database. To do this, use the INIT DB command, if
you have access to a control terminal. Otherwise, do the following:
1. Turn HTU-2 off.
2. Set section 2 (DB INIT) of the S1 DIP switch to ON.
3. Turn HTU-2 on for a short time (until the power-up self-test is performed).
4. Return the DB INIT section to OFF.
Now HTU-2 is operating with the default parameters. The parameter
values included in the default configuration are listed in Appendix G.
5. Configure the unit, if necessary.
You can verify the HTU-2 configuration as explained in the following section. If the
configuration does not require modification, HTU-2 is ready for operation
immediately after the self-test is completed.

Checking the Current Operating Configuration

Before performing the procedure below, review Appendix G, which explains the
HTU-2 configuration parameters.
Note During the following procedure, do not press the ENTER button, in order to avoid
accidental change of parameters.

➤ To check the current operation configuration:

1. Bring the CURSOR to the top row (if it is not already there).
2. Scroll to display SYSTEM PARAMETER in the top row; the second row shows
the first system parameter (CLK MASTER if your HTU-2 is configured as
central) and its current selection.
3. Bring the cursor to the left-hand field in the second row.
4. Scroll to see the other system parameters; each time you press the SCROLL
button, the second row displays the name and current value of the next system
parameter. Continue until the first parameter appears again.
5. Bring the cursor to the right-hand field in the top row.
6. Bring to display the next group of configuration parameters, CHANNEL PRM,
the second display row shows the first data channel parameter, FRAME, and its
current value.
7. Bring the cursor to the left-hand field in the second row.
8. Scroll to see the other parameters of this group; each time you press the
SCROLL button, the second row displays the name and current value of the
next system parameter. Continue until the first parameter (FRAME) appears
again.
9. Repeat steps 5 to 8 to display the rest of the parameters – SP PARAMETERS
and PB PARAMETERS.

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Normal Indications
LCD
If no ON-state alarm is stored in the alarm buffer (ALM indicator is OFF), HTU-2
continues to display the last user-selected display. If there are ON-state alarms
stored in the alarm buffer (ALM indicator is ON) and the HDSL DIAG screen is not
displayed, the top row displays the message ALARM BUFFER.
Note For an explanation of the ON-state Alarm term, refer Alarms in Chapter 5.
In addition, HTU-2 will automatically abort the current activity (except HDSL
DIAG) and will redisplay the ALARM BUFFER message if no front-panel button is
pressed for one minute.
When the top row shows ALARM BUFFER, the second row displays the following
information:
• If there are no ON-state alarm messages stored in the alarm buffer, the second
row shows EMPTY.
• If the alarm buffer contains ON state alarms, HTU-2 displays SCROLL in the
left-hand field of the second row, and CLEAR in the right-hand field.

For instructions on displaying and clearing the alarms, refer to Alarms, in

Chapter 5.

LEDs
• TD and RD light in accordance with the data port activity.
• The TST indicator lights when a test is active. The test type can be displayed by
entering the TEST OPTIONS (Chapter 5).
• The HDSL LOS indicators light when the circuits of the HDSL lines lose
synchronization to the incoming signal.
• The ALM indicator lights when ON-state alarms are stored in the HTU-2 alarm
buffer.
• The rear panel LEDs of the IR-ETH, IR-ETH/Q or IR-IP interface modules light
in accordance with LAN traffic conditions (see Appendix B and Appendix C for
further details).

Monitoring HTU-2 Performance

HTU-2 continuously measures HDSL diagnostics performance data and displays
the results under HDSL DIAG.
For an explanation of the measured parameters, refer to Performance Diagnostics
Data in Chapter 5.

Turning HTU-2 Off

➤ To turn HTU-2 off:
• Set the HTU-2 rear power switch to OFF.
• For the phantom-fed unit, disconnect the HDSL line.

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3.4 Supervisory Terminal Characteristics

Any standard ASCII terminal (“dumb” terminal or personal computer emulating an
ASCII terminal) equipped with a V.24/RS-232 communication interface can be
used to control HTU-2 operation.

Telnet (IP) Host Characteristics

Typically, the Telnet host is a PC with the appropriate suite of TCP/IP protocols, or
a UNIX station.
The Telnet host can be directly connected to the managed HTU-2 unit, or located
at any site from which IP communication can be established to the managed
HTU-2.

Control Port Interface Characteristics

HTU-2 has a V.24/RS-232 asynchronous DCE port, designated CONTROL DCE
and terminated in a 9-pin D-type female connector. The control port continuously
monitors the incoming data stream and will immediately respond to any input
string received through this port; moreover, when configured to support SLIP,
messages in each of the supported protocols are automatically identified and
processed.
The supervisory terminal can be connected to the HTU-2 control port (the
CONTROL DCE connector) either directly or through a modem or any other type
of full-duplex data link.
• For direct connection to the control port, use a straight-through cable.
• For connection to the control port through a modem or data link, use a cross
cable (also called null modem cable).

Modems
HTU-2 supports two types of modems:
• Dial-up Hayes compatible modems. HTU-2 has call-in and call-out
capabilities; that is, it can accept external calls and initiate calls in order to
report alarms.
• Multidrop modems, such as the RAD SRM-8 miniature multidrop modem.

Control Port Handshaking Protocol

The control lines in DCE and DTE modes and the direction of the control signals
are detailed in Table 3-3.

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Table 3-3. Control Port Handshaking Protocol

Control Line Interface Type

DCE DTE
CTS Out Not Used
DCD Out Out
DSR Out Out
DTR In In
RI Not Used In
RTS In In

Data Terminal Ready (DTR)

The terminal sets the DTR line ON (active) to gain control over HTU-2 and start a
configuration/monitoring session.
When the DTR is ON, the front panel controls are disabled, and the LCD displays
a message that notifies the operator that HTU-2 is under remote management:
• When the management mode defined by means of the DEF SP or DEF
CONTROL command (or SP PARAMETERS on the front panel) is the
supervisory terminal (AUXILIARY DEVICE = TERMINAL), the LCD shows
TERMINAL ON LINE.

• When management mode defined by means of the DEF SP or DEF CONTROL

command (or SP PARAMETERS on the front panel) is dial-out mode
(AUXILIARY DEVICE = DIAL_OUT), the LCD shows DIAL OUT MODE.
• When the management mode is the Telnet or SNMP
(AUXILIARY DEVICE is set to a value other than TERMINAL or DIAL OUT), the
LCD shows NETWORK ON LINE and displays the IP address.

When you end the terminal control connection, returning the control to the
HTU-2 front panel, the DTR line goes OFF (becomes inactive).

Request to Send (RTS)

The RTS line is normally ON (active) when the supervisory terminal is in session.
When the RTS line is OFF (inactive), HTU-2 interprets any data received from the
terminal on the TD line as MARK.

Clear to Send (CTS)

The state of the CTS line is determined by the CTS parameter:
• ON – The CTS line is always ON (active).
• =RTS – The CTS line follows the RTS line.

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Data Carrier Detect (DCD)

The state of the DCD line depends on the communication address (node number):
• When the node number is 0, the DCD line is always ON (active).
• When a non-zero node number is used, the DCD becomes ON (active) when
data is detected on the RD line, provided HTU-2 recognizes its own address in
the data stream.

To simulate DTE operation, the delay between these events can be set by the user
(by means of the DCD_DEL parameter).

Ring Indication (RI)

The RI line is used only with dial-up modems (INT=DTE).
The RI line is normally OFF (inactive), and switches to the ON (active) state when
the modem attached to the HTU-2 front-panel CONTROL DCE connector detects
an incoming call, refer to Data Set Ready (DSR), below.

Data Set Ready (DSR)

• Usually, the DSR line is configured to track the DTR line. In this case, if the
control port interface is DTE, the DSR line will be set to ON for five seconds
when the RI line is ON while the DTR line is OFF.
• If the control port interface is DCE, the DSR line can also be configured to be
continuously ON. However, if the DTR line switches to OFF, the DSR line will
also switch to OFF for 5 seconds.

In addition, HTU-2 always sets DSR OFF (inactive) for 5 seconds when the EXIT
command is executed or the disconnect time-out expires.

AUTOBAUD Function
When the AUTOBAUD function is enabled, HTU-2 identifies the operating data of
the supervisory terminal by analyzing the timing of three consecutive Carriage
Return + Line Feed characters (generated by pressing three times the <Enter>
key). The detected data rate is then used for the current communication session.
The automatic baud rate identification procedure is performed (or repeated)
whenever three consecutive carriage returns are received after one of the following
events occurs:
• The DTR line has been switched off.
• The EXIT command has been executed.
• The idle disconnect timeout expired because no data has been exchanged
with the supervisory terminal.

In case one of these events occurred, HTU-2 assumes that the current
communication session has been terminated.
Note You must disable the AUTOBAUD function if you intend to use SLIP
communication.

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3.5 Preliminary Settings for Initial Configuration Session

Configuring the Control Terminal

Before starting an initial configuration session, you must set the supervisory
terminal parameters to match the configuration of the HTU-2 CONTROL DCE
port.
➤ To configure the supervisory terminal:
1. Select full-duplex mode.
2. Turn the terminal echo off.
3. Disable any type of flow control.
4. Connect the terminal cable to the CONTROL DCE connector of HTU-2.
5. Turn the control terminal on.
6. For the initial configuration session, it is recommended to use the default
communication parameters: 9600 bps, one start bit, eight data bits, no parity,
one stop bit.

Configuring HTU-2 for the Terminal Management Session

The software necessary to run the HTU-2 control program is contained in the
HTU-2 system. To initialize HTU-2 for correct terminal operation, the control port
parameters should be set as described in Table 3-4. For a full description of the
control port parameters, refer to Appendix G.

Table 3-4. Control Port Parameters for Supervisory Port Management

Parameter Setting for Terminal Management Session Default

Speed The HTU-2 control port can be configured to communicate at rates of 300, 1200, 9600
2400, 4800, or 9600 bps.
Data The word format consists of one stop bit and 7 or 8 data bits. 8
Parity Parity can be odd, even or none. NONE
Interface For direct connection, choose DCE. DCE
For connection through a modem or data link, choose DTE.

You are now ready to start a management session.

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3.6 Running a Supervisory Terminal Management

Session
If the AUTO (Autobaud) mode is enabled, start the control session by pressing
<Enter> three times. When HTU-2 has successfully identified the data rate of the
supervision terminal, it notifies you of the results of its power-up self-test:
HTU_2 Self Test in Progress ... OK
or
HTU_2 Self Test in Progress ... Failed
In the latter case, you must repair or replace HTU-2 before you can continue using
it.
If HTU-2 successfully passed the power-up self-test, it sends the following
message:
HTU Supervisory Port On Line. Type ‘H’ For Help

Note While HTU-2 is being managed from a supervisory port, the front panel controls on
the HTU-2 unit are disabled.

Starting a Control Session

To start the control session, follow the guidelines below:
• When the node number of HTU-2 is a number other than zero, you must
enter the node number before entering commands. Enter
NODE<SP>‘node number’<SP>, where ‘node number’ is the node number
in the range from 1 to 255, and <SP> is a space. HTU-2 echoes the node
number, i.e. Node<SP>‘node number’<SP>.
• When password protection is enabled, HTU-2 displays the PASSWORD>
prompt at the beginning of the session. Enter your password at the
PASSWORD> prompt; HTU-2 responds to your input with asterisks. The
default password is HTU.
• If a node number is required, enter the node number before the password,
using the following syntax:
NODE<SP>‘node number’<SP>‘password’<Enter>.
• When you enter the correct password, HTU-2 displays the prompt HTU-2>. If
password protection is not enabled, the HTU-2> prompt appears at the
beginning of the session.

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Entering Commands
This section explains how to enter HTU-2 commands using a supervisory port.
Commands are case-insensitive; you can enter commands in either lowercase or
uppercase letters.
➤ To enter commands:
• Enter commands at the HTU-2> prompt. This prompt appears at the
beginning of each new line. The cursor appears to the right of the prompt. If a
node number is required, enter the node number before the command using
the following syntax:
NODE<SP>‘node number’<SP>‘command’<Enter>.
• HTU-2 echoes commands as you enter them, character by character.
• Use <Space> as a separator between command fields and/or parameters.
• To correct typing errors, press <Backspace> until the error is cleared, then
enter the correct characters.
• To execute a command, press <Enter>; when the command is executed,
HTU-2 displays the current date and time, then displays a new command
prompt.
• After the last page of the data form, press <Enter> to initiate command
evaluation.
• To cancel command execution, press <Ctrl>+<C>; the HTU-2> prompt
appears, and you can enter a new command.
• If an idle disconnect time-out is specified, HTU-2 automatically disconnects
the ongoing session if no command is received from the terminal for the
specified time-out interval.
• If you enter an invalid command, HTU-2 does not execute it and displays the
following:
ƒ If the command is not valid in the current system configuration, or the
values you are trying to set are incorrect, HTU-2 displays an appropriate
error message. For a list of configuration error messages, refer to
Configuration Error Messages in Chapter 5.
ƒ If the command syntax is incorrect, HTU-2 displays the following messages:
‘Bad command or parameter. Type ‘h’ for help’
In this case you must enter the correct command.

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Troubleshooting Command Entry

If HTU-2 does not respond to any command entered at the terminal, this may be
caused by one of the following:
• CONTROL DCE communication parameters are not identical to those of the
terminal.
• HTU-2 is configured to use a non-zero node number.

You can cover both possibilities by setting section 2 (DB INIT) of the HTU-2 S1
DIP switch to ON. This will enforce the default communication parameters and
the default (0) node number, and disable password protection in one action, and
you will then be able to start the communication session. However, HTU-2 allows
a finer procedure, which lets you preserve your preset configuration. This
procedure is explained below. Remember that all the changes will take place only
after you turn HTU-2 off for a short time, and then turn it back on.
1. If you don’t know the node number, go to step 2. If you know the node
number, enter it as explained in Entering Commands. If there is still no
response, go to step 3 below. If you see asterisks instead of the command you
entered, this means that HTU-2 requires you to enter a password. Press
<Enter> and enter the node number followed by the password. If you don’t
know the password, set section 4 (PASSWD) of the S1 DIP switch to ON, to
enforce the default password ‘HTU’. This action enforces the default (0) node
number, and you can enter the ‘HTU’ password without any node number
prefix. Now, the HTU-2 working prompt appears and you can start the
session.
2. Set section 4 (PASSWD) of the S1 DIP switch to ON, to enforce the default (0)
node number. Press <Enter>. If there is still no response, go to step 3. If the
prompt you see is PASSWORD>, enter ‘HTU’ to display the working prompt.
3. Set section 3 (DEF SP) of the S1 DIP switch to ON. If there is still no response,
return to step 1 or 2, depending on whether you know the node number.
Note that this time password protection is disabled.

Ending a Control Session

You can end the control session in one of the following three ways:
• Disconnect the cable from the HTU-2 front-panel CONTROL DCE connector.
• Send the EXIT command from the supervisory terminal.
• HTU-2 automatically returns to front panel control if no commands are
received for a certain period of time (controlled by the LOG_OFF parameter).
You can, however, disable this timeout.

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3.7 HTU-2 Command Language

This section presents the HTU-2 command options and the index of commands.

Command Options
The options listed in Table 3-5 are available with certain commands. The list of
commands in Table 3-6 identifies which options are available with which
commands.

Table 3-5. Command Options

Option Meaning Example of Usage

/A All CLR ALM /A
Clears all the alarms stored in the alarm buffer.
/C Clear DSP ALM /C
Displays all the alarms stored in the alarm buffer,
and then clears all the ON-type alarms stored in
the alarm buffer. The term ON-type alarms is
explained in Alarms in Chapter 5.
/CA Clear all DSP ALM /CA
Displays, then clears, all the alarms stored in the
alarm buffer.
/R Repeat command DSP ST LINE /R
execution Enables you to monitor the status of line 1. To
automatically interrupt a repeat operation, press <Ctrl>+<C>.
(available only when
node number is 0)

Index of Commands
Table 3-6 lists the HTU-2 commands in alphabetical order. For a full description of
each command, refer to Appendix G.

Table 3-6. HTU-2 Command Set Index

Command Purpose Options

CLR ALM Clear the alarm messages stored in the HTU2 alarm buffer /A
CLR ALM REM Clear the alarm messages stored in the remote unit alarm buffer /A
CLR ALM HRPT Clear the alarm messages stored in the H-RPT alarm buffer /A
CLR LOOP L HRPT, or Clear a local loopback on H-RPT (only for HTU-2 configured as
CLR LP L HRPT central)

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Table 3-6. HTU-2 Command Set Index (Cont.)

Command Purpose Options

CLR LOOP L LINE, or Clear user-initiated loopbacks of the local HTU-2
CLR LP L LINE
CLR LOOP L CH, or
CLR LP L CH
CLR LOOP R CH, or
CLR LP R CH
CLR LOOP R R CH, or Clear remote loopback on data channel of remote unit (only for
CLR LP R R CH HTU-2 configured as central)
CLR TST Clear all the user-initiated tests and loopbacks
DATE Set the internal date for HTU-2
DEF AGENT Define the parameters of the internal SNMP agent of HTU-2
DEF CALL Define the dial-out parameters for the dial-out port
DEF CH Define the parameters of the data channel
DEF NAME Define the logical name of HTU-2
DEF NODE Define the node number of HTU-2
DEF PB Define the timeslot mapping of priority bumping
DEF PWD Define a password
DEF SP Define control port parameters
DEF SYS Define system parameters
DEF TERM Reset the terminal control codes to 0
DEF TERM VT100
DEF TERM TV920
DEF TERM VT52
Select the control codes for one of the standard terminal types
DEF TERM FREEDOM100
DEF TERM FREEDOM220
DSP ALM Display the contents of the local unit alarm buffer, and optionally /C
clear the buffer /CA
DSP ALM HRPT Display the contents of the H-RPT alarm buffer, and optionally /C
clear the buffer /CA
DSP ALM REM Display the contents of the remote unit alarm buffer, and optionally /C
clear the buffer /CA
DSP HDR TST Display the results of the last hardware self-test
DSP HDSL PM LPX Display the contents of the performance monitoring registers of a /CA
selected HDSL line (X stands for the line number, 1 or 2) of the
local HTU-2, and optionally clear these registers
DSP PB Display timeslot mapping of priority bumping
DSP R HDR TST Display hardware faults detected at the remote appliance (during
the power-on self-test and during normal operation)

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Chapter 3 Operation HTU-2 Installation and Operation Manual

Table 3-6. HTU-2 Command Set Index (Cont.)

Command Purpose Options

DSP R HDSL PM LPX Display the contents of the performance monitoring registers of the /CA
remote unit for a selected HDSL line (X stands for the HDSL line
number, 1 or 2), and optionally clear these registers
DSP ST CH Display status information on the data channel, optionally repeat /R
automatically
DSP ST LINE X Display status information on the HDSL lines (X stands for the HDSL /R
line number, 1 or 2), optionally repeat automatically
DSP ST SYS Display system status information (node name and number,
central/remote mode of HTU-2, type of remote unit, software and
hardware versions, clock source, presence of H-RPT on the HDSL
link and its software and hardware versions)
DSP TS Display the HDSL line timeslot allocation
EXIT End the current control session
F Select the codes for the “clear the screen”, “cursor right”, and
“cursor home” commands sent to the supervision terminal
H or HELP Display a concise index of commands and option switches
INIT DB Reload the database with the default parameters instead of the user-
configured parameters. Table G-14 lists default parameter values
INIT F Reset the codes for “clear the screen”, “cursor right”, and “cursor
home” to 0
LOOP L HRPT, or Activate a local loop on the H-RPT (only for HTU-2 configured as
LP L HRPT central)
LOOP L LINE, or Activate a specified user-controlled loopback on local HTU-2
LP L LINE
LOOP L CH, or
LP L CH
LOOP R CH, or
LP R CH
LOOP R R CH, or Activate remote loopback on remote HTU-2 (only for HTU-2
LP R R CH* configured as central)
RESET Reset the HTU-2 system
TIME Set the internal clock of HTU-2

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 HTU-2 Installation and Operation Manual Chapter 3 Operation

3.8 HTU-2 Management Activities

You can manage the HTU-2 modem either by selecting its configuration
parameters via the front panel or by entering commands from an ASCII terminal
(network management station).
The HTU-2 management activities can be divided into five major groups:
• Defining the configuration parameters
• Displaying alarms, performance statistics, current settings, and test results
• Activating loopback tests
• Deactivating loopbacks and clearing alarm buffers
• Exiting control session and resetting HTU-2.
Some of these tasks may be carried out via front panel and supervisory terminal,
some of them are available only via the terminal. Table 3-7, Table 3-8, Table 3-9,
Table 3-10, Table 3-11 list the management activities and provides information on
their availability from the front panel or supervisory terminal.
Table 3-7. Defining Configuration Parameters
Management Activity Front Panel Supervisory Terminal
Top Row Second Row Command Field
System
Defining master clock SYSTEM CLK MASTER DEF SYS CLK_MASTER
PARAMETERS
Defining availability of remote SYSTEM CONFIG REM DEF SYS CONFIG_REM
management PARAMETERS
Channel
Defining framing mode of the HDSL CHANNEL PRM FRAME DEF CH FRAME
framer
Select the basic data rate per HDSL CHANNEL PRM MULT DEF CH MULTIPLIER
timeslot
Defining the HDSL timeslot CHANNEL PRM MAP DEF CH MAP_TYPE
allocation method
Defining the channel payload data CHANNEL PRM SPEED DEF CH SPEED
rate
Defining the starting timeslot for SEQ CHANNEL PRM START TS DEF CH START_TS
or ALT mapping
Defining the CTS state CHANNEL PRM CTS DEF CH CTS
Defining the Ethernet mode CHANNEL PRM ETHER DEF CH ETHERNET_
MODE
Defining the bridging mode CHANNEL PRM BRIDGING DEF CH BRIDGING
Defining each HDSL timeslot as CHANNEL PRM TS_0 to TS_31 DEF CH TS_0 to TS_31
carrying user's payload or idle for the
USER timeslot allocation

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 Chapter 3 Operation HTU-2 Installation and Operation Manual

Table 3-7. Defining Configuration Parameters (Cont.)

Management Activity Front Panel Supervisory Terminal

Supervisory Port
Defining the control port data rate SP PARAMETERS SPEED DEF SP SPEED
Selecting the number of data bits in SP PARAMETERS DATA DEF SP DATA
word format
Selecting the parity checking method SP PARAMETERS PARITY DEF SP PARITY
Selecting the control port interface SP PARAMETERS INTERFACE DEF SP INTERFACE
Selecting control port management SP PARAMETERS AUX DEV DEF SP AUXILARY
mode DEVICE
Configuring password protection – – DEF SP PWD
Defining idle disconnect time – – DEF SP LOG_OFF
Determining CTS state – – DEF SP CTS
Defining delay between DCD=ON – – DEF SP DCD_DEL
and sending of data
Defining the automatic display on – – DEF SP POP_ALM
the terminal
Determining the DSR state – – DEF SP DSR
Configuring the call-out mode – – DEF SP CALL_OUT_
MODE
Call-Out
Defining the number of retries for – – DEF CALL NUM_OF_
the call-out mode RETRIES
Defining wait-for-connect time for – – DEF CALL WAIT_FOR_
the call-out mode CONNECT
Defining the call-out dialing mode – – DEF CALL DIAL_MODE
Defining the use of an alternate – – DEF CALL ALT_NUM_
number for the call-out mode MODE
SNMP Agent
Defining the Telnet timeout – – DEF AGENT TELNET_APATHY
_TIME
Defining IP address – – DEF AGENT IP ADDRESS
Defining read community – – DEF AGENT READ
COMMUNITY
Defining write community – – DEF AGENT WRITE
COMMUNITY
Defining trap community – – DEF AGENT TRAP
COMMUNITY

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 HTU-2 Installation and Operation Manual Chapter 3 Operation

Table 3-7. Defining Configuration Parameters (Cont.)

Management Activity Front Panel Supervisory Terminal

Top Row Second Row Command Field
Priority Bumping
Defining each timeslot priority PB TS_0 to TS_31 DEF PB TS_0 to TS_31
PARAMETERS
Node and Name
Defining the node number (address) – – DEF NODE
of the HTU-2 unit
Defining the logical name – – DEF NAME
Password
Defining a user password – – DEF PWD NEW PASSWORD
Terminal
Defining a terminal type – – DEF TERM
Resetting all the terminal control – – INIT F
codes to zero
Defining the terminal control codes – – F
Database
Erasing the user-defined – – INIT DB
configuration from the database and
load the default parameters values
Internal Real-Time Clock
Setting the data – – DATE
Setting the time TIME

Table 3-8. Displaying Alarms, Performance Statistics and Current Settings

Management Activity Front Panel Supervisory Terminal
Top Row Second Row Command Field
Alarms
Displaying the contents of the local ALARM BUFFER SCROLL DSP ALM
unit alarm buffer
Displaying the contents of the H-RPT – – DSP ALM HRPT
repeater alarm buffer
Displaying the contents of the – – DSP ALM REM
remote unit alarm buffer
Performance Statistics
Displaying the contents of the HDSL DIAG: One of the DSP HDSL PM
performance monitoring registers of LINEX HDSL
the local unit selected HDSL line parameters

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 Chapter 3 Operation HTU-2 Installation and Operation Manual

Table 3-8. Displaying Alarms, Performance Statistics and Current Settings (Cont.)

Management Activity Front Panel Supervisory Terminal

Top Row Second Row Command Field
Displaying the contents of the – – DSP R HDSL PM
performance monitoring registers of
the remote unit selected HDSL line
Current Settings
Displaying status information on the – – DSP ST LINEX
selected HDSL line
Displaying status information on the – – DSP ST CH
data channel
Displaying system status information – – DSP ST SYS
Displaying the HDSL timeslot CHANNEL PRM – DSP TS
mapping
Displaying priority bumping status PB – DSP PB
PARAMETERS
Displaying an index of the control – – H, HELP
port commands and their options
Test Results
Displaying the result of the last – – DSP HDR TST
hardware test of the local unit
Displaying the result of the last DSP R HDR TST
hardware test of the remote unit

Table 3-9. Activating Loopbacks

Management Activity Front Panel Supervisory Terminal

Top Row Second Row Command Field
Activating a local loopback on the TEST OPTION: LOCAL CH: ON LOOP L CH
data port of the local HTU-2 LOOP
Activating a local loopback on H-RPT TEST OPTION: LOCAL HRPT: LOOP L HRPT
towards HTU-2 configured as central HRPT ON
Activating local loopback on the two TEST OPTION: LOCAL LINE: LOOP L LINE
HDSL lines (only for HTU-2 LOOP ON
configured as central)
Activating remote loopback on the TEST OPTION: REM CH: ON LOOP R CH
data channel of the local HTU-2 LOOP
Activating a remote loopback on data TEST OPTION: REM REM CH: LOOP R R CH
channel of the remote HTU-2 (only CH1 ON
for HTU-2 configured as central)

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 HTU-2 Installation and Operation Manual Chapter 3 Operation

Table 3-10. Deactivating Loopbacks and Clearing Alarms

Management Task Front Panel Supervisory Terminal

Top Row Second Row Command Field
Deactivating Loopbacks
Deactivating a local loopback on the TEST OPTION: LOCAL PORT: CLR LOOP L CH
data port of the local HTU-2 LOOP OFF
Deactivating a local loopback on TEST OPTION: LOCAL HRPT: CLR LOOP L
H-RPT towards HTU-2 configured as HRPT OFF HRPT
central
Deactivating local loopback on the TEST OPTION: LOCAL LINE: CLR LOOP L
two HDSL lines (only for HTU-2 LOOP OFF LINE
configured as central)
Deactivating remote loopback on the TEST OPTION: REM CH: OFF CLR LOOP R
data channel of the local HTU-2 LOOP CH
Deactivating a remote loopback on TEST OPTION: REM REM CH: CLR LOOP R R
data channel of the remote HTU-2 CH OFF CH
(only for HTU-2 configured as
central)
Deactivate all the user-initiated tests – – CLR TST
and loopbacks being activated from
this unit
Clearing Alarm Buffer
Clear the alarm buffer of the local ALARM BUFFER CLEAR CLR ALM/A
unit
Clear the alarm buffer of the remote – – CLR ALM REM/A
unit
Clear the alarm buffer of the H-RPT – – CLR ALM
repeater HRPT/A

Table 3-11. Exiting the Control Session and Resetting HTU-2

Management Activity Front Panel Supervisory Terminal

Top Row Second Row Command Field
Exiting the current control session – – EXIT
and returning control to the HTU-2
front panel
Resetting HTU-2 – – RESET

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Chapter 3 Operation HTU-2 Installation and Operation Manual

3-24 HTU-2 Management Activities

 Chapter 4
Configuration Procedures

4.1 General
This chapter provides detailed instructions for configuring HTU-2 via its front panel
or by means of ASCII terminals and IP hosts using the Telnet protocol.
The initial configuring of HTU-2 is to be performed via its front panel or using a
standard ASCII terminal connected to the HTU-2 control port, CONTROL DCE.
However, after performing the initial configuration, you can manage HTU-2 using
any of the following options:
• Use the terminal as a supervisory terminal, for performing all the management
activities supported by HTU-2.
• Manage HTU-2 from any IP host using the Telnet protocol. After establishing a
Telnet session with HTU-2, the Telnet protocol offers the same functionality as
the supervisory terminal, and in addition enables remote access over IP
networks.
• Manage HTU-2 by means of SNMP-based network management stations, e.g.,
the RADview network management station offered by RAD, using the SLIP
protocol for communication.

Conventions
The following symbols are used in the configuration instructions given below:

denotes configuration procedures performed via the HTU-2 front

panel.

denotes configuration procedures performed via the supervisory

terminal.

General 4-1
Chapter 4 Configuration Procedures HTU-2 Installation and Operation Manual

4.2 Configuring HTU-2 Working Opposite HTU-2

This section gives detailed instructions on HTU-2 configuration for a sample
point-to-point application opposite another HTU-2 unit, working at 2048 kbps
(see Figure 4-1). The instructions include configuration via the front panel and
supervisory terminal.

Central Office/POP Customer Premises

V.35 HDSL Line V.35

n x 64 kbps 4.8 km n x 64 kbps

or Central HTU-2 Remote HTU-2 or
n x 56 kbps n x 56 kbps

Figure 4-1. HTU-2 Operating Opposite Another HTU-2

When HTU-2 operates opposite another HTU-2 unit, they must be configured as
Central and Remote. In most cases you will have to configure only the central
HTU-2 and the remote unit will receive its parameters from the central unit via the
EOC if the CONFIG REM value under the SYSTEM PARAMETER menu is set to
YES. All you have to do is to define the functional mode of the remote unit.
➤ To define the remote HTU-2 functional mode:
1. Disconnect HTU-2 from the mains.
2. Open the modem case, as explained in Chapter 2.
3. Set the JP1 jumper to R (Remote).
Note During the database initialization process described in steps 4–8 below, the modem
resets itself to the default parameters and reads its hardware (jumper/switch)
settings. Hence, when changing the jumper or switch settings, the database
initialization must be carried out so that a new setting becomes effective.
4. Set section 2 (DB INIT) of the S1 DIP switch to ON.
5. Close the HTU-2 case and power up the unit.
HTU-2 performs self-test.
6. Once the self-test is completed, turn HTU-2 off.
7. Set the DB INIT section to OFF position.
8. Turn the unit on.
9. Connect HTU-2 units with HDSL straight cable. Approximately a half minute
after turning on the unit, the modems should synchronize.

Important Some of the HTU-2 configuration parameters depend on the remote unit type.
Therefore, after HDSL synchronization is reached, wait for about one minute
(two minutes if H-RPT installed in the HDSL line) before you start configuring the
modem. This allows the proper recognition of the remote unit and ensures the
correct HTU-2 configuration.

4-2 Configuring HTU-2 Working Opposite HTU-2

HTU-2 Installation and Operation Manual Chapter 4 Configuration Procedures

10. Check the functional mode of the modem on the LCD panel by pressing the
SCROLL button until SYSTEM PARAMETER is displayed in the top row.
11. Bring the cursor to the left-hand field of the second row and display MASTER
FUNC by pressing SCROLL.
The right-hand field displays the HTU-2 functional mode: REM (Remote).
12. Verify that the HDSL LOS LINE A and HDSL LOS LINE B LEDs turn off.
If you intend to monitor the remote HTU-2 by means of terminal or SNMP, you
must configure the terminal type or SNMP agent parameters to be used for the
proper mapping of the unit in the IP network. For the description of the terminal
settings, refer to the appropriate section below; the SNMP agent parameters are
detailed in the description of the DEF AGENT command in Appendix G.

Preliminary Configuration of the Central HTU-2

Since the HTU-2 modems are delivered with the functional mode already set to
Central, all you have to do before starting the configuration procedure is to select
the type of the terminal to be used for the management. HTU-2 supports the
following terminal types: VT52, VT100, TV920, FREEDOM100, FREEDOM220.
➤ To define the terminal type:
• Type DEF TERM 'terminal' and press <Enter>.
where 'terminal' is one of the terminal types listed above.
Note If you enter the DEF TERM command without the terminal type, HTU-2 resets all
the three control codes to zero. For the details on the terminal control codes, refer
to the description of the DEF TERM command in Appendix G.

Configuring System and Data Channel Parameters via the Front Panel
The HTU-2 configuration procedure includes defining its system and channel
parameters.
➤ To configure the system parameters via the front panel:
1. Bring the cursor to the left-hand field of the LCD top row (if it is not already
there).
2. Display SYSTEM PARAMETER in the top row by pressing the SCROLL button.
CLK MASTER is displayed in the left-hand field of the second row.
3. Bring the cursor to the right-hand field of the second row.
4. Press SCROLL to display the desired value:
ƒ EXT – Locked to the recovered receive clock of the data channel port.
ƒ INT – Internal oscillator
Default – EXT for serial data channels
INT for units with the Ethernet interface.

5. Bring the cursor to the left-hand field of the second row.

6. Display CONFIG REM in the second row by pressing the SCROLL button.

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Chapter 4 Configuration Procedures HTU-2 Installation and Operation Manual

7. Bring the cursor to the right-hand field of the second row.

8. Press SCROLL to display YES (configuration downloading to the remote unit is
enabled).
9. Press ENTER when the cursor is in the right-hand field of the second row to
save your choice.

Note • For connection to carrier lines with serial interfaces, select EXT.
• For a point-to-point application with standalone equipment at both link ends,
you can also select INT.

➤ To configure the data channel parameters via the front panel:

1. Bring the cursor to the left-hand field of the LCD top row (if it is not already
there).
2. Display CHANNEL PRM in the top row by pressing the SCROLL button.
FRAME is displayed in the left-hand field of the second row.
3. Bring the cursor to the right-hand field of the second row, scroll to select
FRAMED.
4. Bring the cursor to the left-hand field of the second row, scroll to display
MULT and set it to 64.
5. Scroll to display MAP in the left-hand field of the second row and set it to
SEQ.
6. Scroll to display SPEED in the left-hand field of the second row and set it to
2048 kbps.
7. Scroll to START and select the 0 as your starting timeslot.
8. Press ENTER when the cursor is in the right-hand field of the second row to
save your choice.
Note If your data rate is less than 2048, select the appropriate value for the SPEED
parameter as described in step 6. In order to select a proper starting timeslot, make
sure that the sum of the starting timeslot number and SPEED/MULT does not exceed
31 (START + SPEED/MULT ≤ 31).

Configuring System and Data Channel Parameters via Supervisory Terminal

➤ To configure the system parameters via the terminal:

1. Type DEF SYS and press <Enter>.
HTU-2 displays the system parameters form:

CLK_MASTER CONFIG_REM
EXT YES

2. Bring the cursor to the first field and, if desired, select the clock source value
(EXT or INT) by pressing <F> or <B> to scroll among the available
selections.

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HTU-2 Installation and Operation Manual Chapter 4 Configuration Procedures

3. Move to the CONFIG_REM field by pressing the spacebar and select YES.
4. Press <Enter> to save your choice.
HTU-2 displays the data and time, followed by the HTU-2> prompt.
➤ To configure the data channel parameters via the terminal:
1. Type DEF CH and press <Enter>.
HTU-2 displays the first line of the data channel parameters:

FRAME MULTIPLIER MAP_TYPE SPEED START_TS CTS ETHERNET_MODE

FRAMED 64 SEQ 2048kbps 0 ON N/A

2. Bring the cursor to the first field and, and select the FRAMED by pressing <F>
or <B> to scroll among the available selections.
3. Move the cursor to the MULTIPLIER field by pressing the spacebar and select
64.
4. Move the cursor to the MAP_TYPE field by pressing the spacebar and select
SEQ.
5. Move the cursor to the SPEED field and select 2048 kbps.
6. Move the cursor to START_TS field and select 0 as you starting timeslot.
7. Press <Enter> six times.
HTU-2 displays the second line of the data channel parameters followed
by four lines of the timeslot mapping data and then the HTU-2> prompt.

4.3 Configuring HTU-2 Working Opposite HTU-E1

HTU-2 operates opposite the other RAD HDSL products, such as HTU-E1. When
working opposite HTU-E1, HTU-2 can be configured to transfer full or fractional
E1 data.

Configuring HTU-2 to Transfer Full E1 Data

Instructions for configuring HTU-2 to carry unframed 2048 kbps E1 data is similar
to the procedures listed in the previous section. Make sure to make the following
settings:
• Select the UNFRAMED framing method.
• Select the SEQ mapping type.
• Set SPEED to 2048 kbps.
• Select timeslot 0 as your starting timeslot.

Note Any change in the framing mode will cause double temporary HDSL
synchronization loss.

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Chapter 4 Configuration Procedures HTU-2 Installation and Operation Manual

Configuring HTU-2 to Transfer Fractional E1 Data

When configuring HTU-2 to carry fractional E1 data, it is important to assign the
correct number of timeslots to support the necessary data rate. For example, if you
intend to transfer 128 kbps data, you should perform configuration procedures
explained in Section 4.2, except for the following:
• Set SPEED to 128 kbps.
• Select any timeslot, except for timeslot 0, as your starting timeslot. Make sure
that the sum of the starting timeslot number and SPEED/MULT does not
exceed 31 (START + SPEED/MULT ≤ 31).

Configuring the Timeslot Priority

When working in the framed mode with data rates lower than 1024 kbps, it is
recommended to configure timeslots carrying data as “high priority” timeslots. In
this case, if one of the HDSL lines is down, these timeslots will be sent over the
remaining line.
➤ To select the timeslot priority via the front panel:
1. Bring the cursor to the left-hand field of the LCD top row (if it is not already
there).
2. Display PB PARAMETERS in the top row by pressing the SCROLL button.
TS_1 is displayed in the left-hand field of the second row.
3. Bring the cursor to the left-hand field of the second row, scroll to display the
number of the timeslot to be set to the high priority.
4. Bring the cursor to the right-hand field of the second row and scroll to HIGH.
5. Repeat the above procedure for all timeslots to be configured as high priority
timeslots.
6. Press ENTER when the cursor is in the right-hand field of the second row to
save your choice.
➤ To select the timeslot priority via the terminal:
1. Type DEF PB and press <Enter>:
HTU-2 displays the first line of the timeslot map of the priority bumping:

TS_1 TS_2 ... ... TS_20

LOW LOW ... ... LOW

2. If you want to change the priorities, use the spacebar to move between
timeslots. For each desired timeslot, select HIGH by pressing <F> or <B>.
3. After completing the first line, press <Enter> to move the cursor to the next
line. Repeat the procedure until all the desired timeslots are defined.
4. Press <Enter> to finish.
HTU-2 displays the date and time followed by the HTU-2> prompt.
Note Timeslot 0 always has HIGH priority. The maximum number of other timeslots that
can be configured to high priority is 16.

4-6 Configuring HTU-2 Working Opposite HTU-E1

 Chapter 5
Troubleshooting and
Diagnostics
This chapter describes the HTU-2 diagnostics functions, which include:
• Status indications, alarms, configuration errors, general troubleshooting –
Section 5.1
• Performance diagnostics – Section 5.2
• Diagnostic loopbacks – Section 5.3

5.1 Status Indications and Alarms

This section explains how to detect and fix errors and other problematic conditions
in HTU-2. Included in this section is information on:
• Power-up self-test
• Alarms
• Configuration error messages
• General troubleshooting.

Power-Up Self-Test
HTU-2 performs a power-up self-test upon turn-on. The self-test sequence tests
the critical circuit functions and the display. During the self-test, HTU-2 displays its
current software revision on the LCD. After successfully completing the self-test
procedure, HTU-2 switches to the default ALARM BUFFER screen.
In case of failure, HTU-2 displays an appropriate message in the second row of the
front panel. For more information on the power-up self-test, refer to Turning
HTU-2 On in Chapter 3.
Front-Panel LEDs
The status of HTU-2 is indicated by the ALM, TST and HDSL LOS LED indicators
located on the front panel. For description of LED indicators and their functions,
refer to Front Panel Controls, Connectors and Indicators in Chapter 3.

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Chapter 5 Troubleshooting and Diagnostics HTU-2 Installation and Operation Manual

Alarms
HTU-2 maintains an alarm buffer, which can store up to 100 alarm messages.
Alarms can be of two types, designated as ON/OFF and ON:
• A message indicating an ON-type alarm remains displayed on the LCD even
after the event that caused the alarm condition is cleared.
• An ON-type alarm reenters the alarm buffer each time the corresponding
alarm condition is checked, as long as the alarm condition is present.
• A message indicating an ON/OFF-type alarm is displayed on the LCD only
when the alarm condition is present, and is automatically discontinued when
the alarm condition is cleared (if the alarm is being displayed, it disappears
only when the display is refreshed by scrolling).
• An ON/OFF-type alarm enters the alarm buffer only if the alarm status is
changed (the alarm condition appears or disappears).

This manual uses the term ON-state alarm. An ON-state alarm is either an
ON-type alarm or an ON/OFF-type alarm when its alarm condition is still present.
When an ON/OFF-type alarm changes its state from ON to OFF, it is not removed
from the alarm buffer. Moreover, a new entry of this alarm is added to the alarm
buffer. This feature enables you to view the alarm history on the terminal using the
DSP ALM command. A typical display looks like this:
ALARM 10 SIGNAL LOSS: LP1 OFF 2001-05-02 00:04.46
ALARM 10 SIGNAL LOSS: LP1 ON 2000-05-02 00:00.01

Messages displayed on the LCD and on the control terminal have a similar syntax.
Table 5-1 presents in alphabetical order the alarm messages displayed on the
HTU-2 LCD and control terminal, and lists the actions required to correct each
alarm condition.
H-RPT Alarms
If you have an H-RPT repeater on the HDSL link, HTU-2 allows you to monitor
and work with the H-RPT alarms via its control terminal. The H-PRT buffer stores a
maximum of 100 alarms. The types and states of the H-RPT alarms and the rules of
working with the H-RPT alarm buffer are exactly the same as for the HTU-2 alarm
buffer.
Table 5-2 presents the H-RPT alarm messages displayed on the HTU-2 control
terminal in order of their numbers, and lists the actions required to correct the
alarm condition. The H-RPT alarms are not available from the LCD.

5-2 Status Indications and Alarms

HTU-2 Installation and Operation Manual Chapter 5 Troubleshooting and Diagnostics

Table 5-1. HTU-2 Alarm Buffer Messages

LCD Message Terminal Message Alarm Probable Cause Corrective Actions Alarm Type
Number
–– ALARM BUFFER 02 More than 100 alarm entries Read the messages and then clear the buffer ON/OFF
OVERFLOW* have been written in the alarm by sending the CLR ALM/A command from the
buffer since the last clear control terminal.
command. New alarms are
overwriting older alarms.
DB CHKSUM ERR– DB CHECKSUM ERROR 01 The database currently stored in 1. Enter the INIT DB command from the ON/OFF
the non-volatile memory of control terminal or set the Section 2 (DB
HTU-2 is corrupted. INIT) of the internal DIP switch to ON, to
load the default configuration in the place
of the current database, then reconfigure
HTU-2 with the desired parameters.
2. Perform the power-up self-test and replace
HTU-2 if it fails the test.
DB-INIT DW IS ON DB-INIT SWITCH IS ON 07 Section 2 (DB INIT) of the If it is no longer necessary to enforce the ON
internal DIP switch is set to ON. default database parameter values, change
This message appears only upon setting to OFF.
power-up.
DIAL CYCLE FAIL DP DIAL CYCLE FAILED 44 The current cycle of call attempts Check the modem connected to the ON
(both to the primary and CONTROL DCE connector. If the called
alternate numbers) failed. numbers are often busy, you may also increase
the number of call retries.
DP ALT CALL FAIL DP ALTERNATE CALL 46 The call attempts to the alternate If the number is not busy, check the modem ON
FAILED dial-out number failed connected to the CONTROL DCE connector.
If the called numbers (primary as well as
alternate) are often busy, you may also
increase the number of call retries
DP PRM CALL FAIL DP PRIMARY CALL 45 The call attempts to the primary If the number is not busy, check the modem ON
FAILED dial-out number failed connected to the CONTROL DCE connector.
If the called number is often busy, you may
also increase the number of call retries

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Chapter 5 Troubleshooting and Diagnostics HTU-2 Installation and Operation Manual

Table 5-1. HTU-2 Alarm Buffer Messages (Cont.)

LCD Message Terminal Message Alarm Probable Cause Corrective Actions Alarm Type
Number
DTE NOT CON CH DTE NOT 21 The Ethernet interface is not Check the cable connecting the LAN, the LAN ON/OFF
CONNECTED TO CH connected to an operating LAN media, and check that at least one station is
active on the LAN
ELASTIC BUF OVF ELASTIC BUFFER 17 The HDSL elastic buffer is 1. Check the timing of clocks selected in the ON
OVERFLOW overflown. system, and make sure that they are
derived from the same source.
2. Perform the power-up self-test and replace
HTU-2 if it fails the test.
ELS BUF ERR: LP1 ELASTIC BUFFER 16 The corresponding HDSL line is 1. Check HDSL line connections. ON
ELS BUF ERR: LP2 ERROR: LP1 not supplying data.
2. Check the operation of the local and
ELASTIC BUFFER
remote units and replace if necessary.
ERROR: LP2
HARDWARE FAILURE HARDWARE FAILURE 04 HTU-2 technical failure (failure of Replace HTU-2 ON
one of the internal programmable
components). This message can
appear only upon power-up.
INTERNAL CLK USE CLOCK WAS 09 HTU-2 configured as central 1. Check the external clock source. ON/OFF
CHANGED TO switched to the internal clock
2. Perform the power-up self-test and replace
INTERNAL source, because the external
HTU-2 if it fails the test.
clock sources failed.
LOC CRC ALM: LP1 LOCAL CRC ALM: LP1 13 A CRC-6 error has been detected If the number of CRC-6 errors is significant ON
LOC CRC ALM: LP2 LOCAL CRC ALM: LP2 in the input signal of the HDSL (more than a few errors per hour), perform the
line. following:
1. Check the HDSL line to the remote unit.
2. Perform self-test on the two units and
replace the unit that fails the self-test.

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Table 5-1. HTU-2 Alarm Buffer Messages (Cont.)

LCD Message Terminal Message Alarm Probable Cause Corrective Actions Alarm Type
Number
LOOPS INVERTED LOOPS ARE INVERTED 15 The unit (configured as remote) Internally, the remote unit automatically ON/OFF
detected incorrect HDSL line corrects the connections to enable regular
connections (interchange operation.
between the two HDSL lines).
PHASOR PHASOR OVERFLOW 20 A problem of receive or transmit 1. Check if there is a problem at the remote ON
OVERFLOW clock between the data channel equipment.
and remote equipment
2. Perform the power-up self-test and replace
connected to the data channel
HTU-2 if it fails the test.
PSWRD DW IS ON PSWRD SWITCH IS ON 05 Section 4 (PASSWD) of the If it is no longer necessary to enforce the ON
internal DIP switch is set to ON. default password and node number, change
This message appears only upon setting to OFF.
power-up.
– REMOTE BPV ERROR* 28 A report of bipolar violation error Have the link between the E1 port of the ON
at the E1 port of the remote remote unit and its DTE checked.
appliance has been received via
the EOC.
REM CRC ALM: LP1 REMOTE CRC ALM: LP1 14 The remote unit reports that a If the number of CRC-6 errors is significant ON
REM CRC ALM: LP2 REMOTE CRC ALM: LP2 CRC-6 error has been detected in (more than a few errors per hour), perform the
the input signal of the specified following:
HDSL line.
1. Check the HDSL line to the remote unit.
2. Perform self-test on the two units and
replace the one that fails the self-test.
– REMOTE INDICATION 12 The remote equipment reports a 1. Check the cable connection between the ON/OFF
ALARM* remote sync loss alarm. remote unit and its DTE.
2. Check the line and/or other
communication equipment providing the
link between the remote unit and its DTE.
3. Replace the remote equipment.

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Table 5-1. HTU-2 Alarm Buffer Messages (Cont.)

LCD Message Terminal Message Alarm Probable Cause Corrective Actions Alarm Type
Number
– REMOTE SIGNAL LOSS* 27 A report of loss of input signal 1. Check cable connections between the E1 port ON/OFF
at the E1 port of the remote of the remote unit and its DTE.
equipment has been received.
2. Check the line and/or other communication
equipment connected to the E1 port of the
remote unit.
3. Replace the remote equipment.
RTC BATTERY FAIL REAL TIME CLOCK 08 The battery that powers the Repair HTU-2. ON
BATTERY FAILURE HTU-2 internal real-time
clock when HTU-2 is not
powered, has failed. This
message appears only upon
power-up.
SELF TEST ERROR SELF TEST ERROR 03 A problem has been detected Repeat the power-up self test and replace HTU-2 ON
during HTU-2 cyclic self-test. if it fails the test.
SIGNAL LOSS:LP1 SIGNAL LOSS:LP1 10 Loss of input signal on the 1. Check the specified HDSL line. ON/OFF
SIGNAL LOSS:LP2 SIGNAL LOSS:LP2 corresponding HDSL line.
2. Perform self-test on the two units and replace
the one that fails the self-test.
SP-PAR DW IS ON SP-PAR SWITCH IS ON 06 Section 3 (DEF SP) of the If it is no longer necessary to enforce the default ON
internal DIP switch is set to control port parameters, change setting to OFF.
ON. This message appears
only upon power-up.
STUFF OVERFLOW HDSL STUFFING 18 The stuffing mechanism 1. Check the clock source selection. ON
OVERFLOW cannot compensate for the
2. Check the equipment providing the DTE signal
frequency difference between
(unstable clock source).
the DTE clock and the HDSL
clock. 3. Perform the power-up self-test and replace
HTU-2 if it fails the test.

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Table 5-1. HTU-2 Alarm Buffer Messages (Cont.)

LCD Message Terminal Message Alarm Probable Cause Corrective Actions Alarm Type
Number
SYNC LOSS:LP1 SYNC LOSS:LP1 26 Loss of synchronization on the 1. Check the specified HDSL line. ON/OFF
SYNC LOSS:LP2 SYNC LOSS:LP2 corresponding HDSL line
2. Perform self-test on the two units and replace
the one that fails the self-test.
TIMING OVERFLOW TIMING OVERFLOW 19 The data line recovery circuits 1. Check the equipment providing the data ON
cannot recover the data line signal, and make sure its clock source is stable.
clock, because its frequency is
2. Perform the power-up self-test and replace
not within the supported
HTU-2 if it fails the test.
range.

Notes • Alarms marked with an asterisk (*) appear only on the supervisory terminal.
• Alarms 12, 27 and 28 appear only if the remote unit has an E1 port.

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Table 5-2. H-RPT Alarm Buffer Messages

LCD Message Alarm Probable Cause Corrective Actions Alarm Type

Number
HRPT_LTU SIGNAL LOSS:LP1 01 Loss of input signal on the 1. Check the corresponding HDSL line. ON/OFF
HRPT_LTU SIGNAL LOSS:LP2 specified HDSL line at the
2. Perform a self-test on the unit
LTU side of H-RPT.
configured as remote and replace the
unit if it fails the self-test.
3. Replace H-RPT.
HRPT_NTU SIGNAL LOSS:LP1 02 Loss of input signal on the 1. Check the corresponding HDSL line. ON/OFF
HRPT_NTU SIGNAL LOSS:LP2 specified HDSL line at the
2. Perform a self-test on the unit
NTU side of H-RPT.
configured as central and replace the
unit if it fails the self-test.
3. Replace H-RPT.
HRPT_LTU SYNC LOSS:LP1 03 Loss of synchronization on the 1. Check the corresponding HDSL line. ON/OFF
HRPT_LTU SYNC LOSS:LP2 specified HDSL line at the
2. Perform a self-test on the unit
LTU side of H-RPT.
configured as remote and replace the
unit if it fails the self-test.
3. Replace H-RPT.
HRPT_NTU SYNC LOSS:LP1 04 Loss of synchronization on the 1. Check the corresponding HDSL line. ON/OFF
HRPT_NTU SYNC LOSS:LP2 specified HDSL line at the
2. Perform a self-test on the unit
NTU side of H-RPT.
configured as central and replace the
unit if it fails the self-test.
3. Replace H-RPT.
HRPT_SELF TEST ERROR 05 A problem has been detected Replace H-RPT. ON
during the cyclic H-RPT
self-test.

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Table 5-2. H-RPT Alarm Buffer Messages (Cont.)

LCD Message Alarm Probable Cause Corrective Actions Alarm Type

Number
HRPT_LTU CRC ALM: LP1 06 A CRC-6 error has been If the number of CRC-6 errors is significant ON
HRPT_LTU CRC ALM: LP2 detected in the input signal of (more than a few errors per hour), perform
the specified HDSL line at the the following:
LTU side of H-RPT.
1. Check the appropriate HDSL line from
H-RPT to the unit configured as remote.
2. Perform a self-test on the unit
configured as remote and replace the
unit if it fails the self-test.
3. Replace H-RPT.
HRPT_NTU CRC ALM: LP1 07 A CRC-6 error has been If the number of CRC-6 errors is significant ON
HRPT_NTU CRC ALM: LP2 detected in the input signal of (more than a few errors per hour), perform
the specified HDSL line at the the following:
NTU side of H-RPT.
1. Check the HDSL lines to the remote
unit.
2. Perform a self-test on the unit
configured as central and replace the
unit if it fails the self-test.
3. Replace H-RPT.
HRPT ALARM BUFFER OVERFLOW 08 More than 100 alarms entries Read the messages and then clear the ON/OFF
have been written in the buffer by sending the CLR ALM HRPT/A
H-RPT alarm buffer since the command from the control terminal.
last clear command. New
alarms are overwriting the
older alarms.

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Working with Alarm Buffer

You can manage the alarm buffer either from the control terminal, or from the
LCD.

Displaying and Clearing Alarm Messages

You can use the front panel LCD display to view ON-state alarm messages, and to
delete the alarm messages from the buffer when no longer needed.
➤ To display the active alarm messages from the front panel:
1. In the top row of the LCD display, scroll to ALARM BUFFER; the second row
displays the following information:
ƒ During normal operation, the second row shows EMPTY (no alarm
messages).
ƒ If the alarm buffer contains ON-state alarms, the LCD shows SCROLL in the
left-hand field of the second row, and CLEAR in the right-hand field.

2. Bring the cursor to SCROLL and press ENTER; you can now scroll between the
ON-state alarms stored in the alarm buffer. To interpret the alarm messages
displayed in the second row, refer to Table 5-1.
To display the active alarms from the control terminal, enter DSP ALM. The
terminal displays up to 100 alarms stored in the buffer, for each alarm listing its
number, its state (ON or OFF), the date and the time when the last change in its
state occurred.
➤ To clear alarm messages from the HTU-2 alarm buffer:
1. Scroll with the CURSOR key to display ALARM BUFFER in the first row.
2. Move the CURSOR to CLEAR in the second row.
3. Press ENTER to clear the ON-type alarms and the alarm history in the alarm
buffer. If no ON-state alarms are present, the second row should show EMPTY.
To clear alarm messages from the alarm buffer using the control terminal, use the
CLR ALM/A command. To clear alarm messages in the remote unit, use the CLR
ALM REM/A command. To clear alarm messages in the repeater, use the CLR ALM
HRPT/A command.

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Configuration Error Messages

If HTU-2 detects a configuration mismatch, it displays an appropriate configuration
error message. These messages appear on either the LCD or the supervisory
terminal. Some of the messages are not available on the LCD. There is also one
unavailable on the supervisory terminal.
On the control terminal, configuration error messages have the format ERROR,
followed by a two-digit code and a short description of the error message after the
error code. The LCD displays CONFIG ERROR followed by the error two-digit
code, without description. Table 5-3 lists the configuration error messages in order
of their codes and explains each of them. Messages not available on the LCD are
marked with an asterisk (*).

Table 5-3. Configuration Error Messages

Error Code Terminal Message Description

ERROR 01 ILLEGAL LOOP COMBINATION You are trying to activate Illegal combination of
loopbacks.
ERROR 02* LOOP IS NOT ACTIVE You are trying to deactivate a loopback or a test that is
not active.

ERROR 03 ILLEGAL COMMAND FOR You are trying to perform command that is not valid in
CURRENT PORT MODE the current system configuration. For example, you are
trying to set timeslot priority bumping while HTU-2 is
in unframed mode, or you are trying to change the
settings of the HTU-2 configured as remote when it is
under control of the central unit..
ERROR 04 On LCD only:
You are trying to change a parameter from the front
panel when the password protection is enabled.
ERROR 05 Reserved for future use.
ERROR 06 ILLEGAL NUMBER OF TIME The total number of high priority timeslots selected
SLOTS SELECTED exceeds the maximum (16 timeslots) allowed.
ERROR 07* ILLEGAL NODE NUMBER You are trying to select a node with number greater
than 255.
ERROR 08 ILLEGAL SPEED FOR CURRENT The AUTO (Autobaud) mode cannot be selected when
AUXILIARY DEVICE the CONTROL DCE port is configured to support the
SLIP (AUX DEV parameter is set to NMS-SLIP).
ERROR 09 Reserved for future use.
ERROR 10 CONFLICT IN SPEED AND TS The number of timeslots currently allocated to a data
PARAMETERS channel is not equal to the number of timeslots
required to support the nominal data rate configured
for this channel under SPEED parameter. Check and
change as required.

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Table 5-3. Configuration Error Messages (Cont.)

Error Code Terminal Message Description

ERROR 11 Reserved for future use.
ERROR 12* ILLEGAL DCD_DEL AND You are trying to select a non-zero DCD DELAY, while
INTERFACE COMBINATION the CONTROL DCE port is configured as DCE.
ERROR 13 CONFLICT IN INTERFACE AND You have selected DSR=ON, while the CONTROL
DSR PARAMETERS DCE port has been configured as DTE. The DSR=ON
selection is valid only for DCE interface.
ERROR 14 Reserved for future use.
ERROR 15 Reserved for future use.
ERROR 16 Reserved for future use.
ERROR 17* YEAR SHOULD BE IN THE You are trying to select an invalid number for the year.
RANGE 1996-2095
ERROR 18 ILLEGAL UNFRAMED MODE For working in unframed mode, all the 32 timeslot
must be assigned to carry data.
ERROR 19 ILLEGAL NUMBER OF DAYS FOR You are trying to select an invalid number for the day
THIS MONTH of the month.

General Troubleshooting
In case a problem occurs, check the displayed alarm messages as described in
Table 5-1. If the trouble cannot be corrected by performing the actions listed in
Table 5-1, check the problems and solutions listed in Table 5-4. Perform the
actions listed under Corrective Measures in the order given in the table, until the
problem is corrected.

Table 5-4. Troubleshooting Chart

Trouble Symptoms Probable Cause Corrective Measures

HTU-2 is not No power Check that both ends of the power cable are properly
functioning. connected, and that the POWER switch is ON.
If HTU-2 is powered from DC, check the polarity of the
power connections.
In the case of a phantom-fed HTU-2/P version, check its
connections to the HTU-2C/P card or to the HTU-2/PF
unit and their fuses. Make sure that the phantom power
feeding equipment is powered up.
Blown fuse Disconnect power cable from both ends and replace the
(AC version only) fuse with another fuse of proper rating.
Defective HTU-2 Replace HTU-2.

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Table 5-4. Troubleshooting Chart (Cont.)

Trouble Symptoms Probable Cause Corrective Measures

One or both HDSL External problem Check that the remote unit and H-RPT (if there is one) are
LOS LINE indicators operating.
light
Check for proper connection of the pairs connecting
between the local and the remote units.
Check the loop resistance of the pairs and make sure the
resistance does not exceed the design values. You may
also use a transmission measurement set to check that
loop attenuation is within the allowed limits
Defective HTU-2 Perform a power-up self-test and replace HTU-2 if it fails
the test.
The DTE connected to Cable problem Activate the local channel loopback. If the DTE does not
the local unit does not receive its own transmission, check the cable connecting
receive data. (HDSL it to the HTU-2 DCE connector.
LOS indicator is OFF)
Defective DTE Check the DTE.
Defective HTU-2 Perform a power-up self-test and replace HTU-2 if fails
the test.
The COLL indicator of A loopback is active If the TST indicator is lit, deactivate the loopback.
the Ethernet interface
module lights up
frequently, and LAN is
not operating properly
Cable problem Check and replace if necessary the cable that connects
the HTU-2 Ethernet module connector to the LAN.
LAN problem Disconnect HTU-2 from the LAN, if the problem persists,
troubleshoot the LAN.
Defective HTU-2 Perform a power-up self-test and replace HTU-2 if it fails
the test.
The LINK indicator of No active station on Check that at least one station is active on the LAN.
the Ethernet interface the LAN
module is not lit
Cable problem Check and replace if necessary the cable that connects
the HTU-2 Ethernet module connector to the LAN.
Defective HTU-2 Perform a power-up self-test and replace HTU-2 if it fails
the test.

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5.2 Performance Diagnostics Data

General
HTU-2 has capabilities for collection of the HDSL performance statistics.
This section explains how to display performance data from the HTU-2 front panel
and from a control terminal, and provides a description of the available
performance monitoring parameters.
Displaying the Performance Data on the Front Panel LCD
➤ To display the HDSL performance diagnostics data on the LCD:
1. Bring the CURSOR to the left-hand field of the top row (if it is not already
there).
2. Scroll to display HDSL DIAG in the top row; the right-hand field displays either
LINE 1 or LINE 2; the second row shows the first performance item for the
corresponding HSDL line and its current value.
3. Bring the cursor to the left-hand field in the second row.
4. Scroll to see the other statistics; each time you press SCROLL, the second row
shows the current value of the next item. Continue until the first item appears
again.
5. Bring the cursor to the right-hand field of the top row and scroll to the other
line.
6. Repeat steps 3, 4 to see the HDSL statistics of the other line.

Clearing the Performance Data Registers

You can reset the registers storing diagnostics data. To reset a register, bring the
register to display and press ENTER. When you press ENTER, all the HDSL
performance registers that belong to the corresponding line are simultaneously
reset.
Displaying the Performance Data on a Control Terminal
You can display the HDSL performance data on the supervisory terminal by using
the DSP HDSL PM, and DSP R HDSL PM commands. By adding the /CA switch to
the command, you can reset all the performance diagnostics registers of the
corresponding HDSL line.
For instructions on entering commands through the supervisory terminal, refer to
Chapter 3.

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Performance Monitoring Parameters

Table 5-5 lists the performance evaluation and monitoring functions provided by
HTU-2.

Table 5-5. Performance Monitoring Parameters

Display Name Description Range

BBER Background Block The ratio of background block error seconds to the total
Error Ratio seconds in the current 15-minute interval. The display is
updated every second.
Note: This parameter is not displayed on the LCD.
CURR BBE Current A BBE is an errored block not occurring during a severely 0-900
Background Block errored second. This parameter displays the number of BBE
Errors measured during the current 15-minute interval. The display
is updated every second.
CURR ES Current Errored An errored second is any second containing one or more 0-900
Seconds CRC error events, or one or more OOF events, or one or
more controlled slip events. This parameter displays the
number of errored seconds during the current 15-minute
interval. The display is updated every second.
CURR SECS Current Seconds This parameter displays the time in seconds that has expired 0-900
from the start of the current 15-minute interval. The display
is updated every second.
Note: This register is called CURRENT TIMER on the control
terminal.
CURR SES Current Severely A SES is a second with 832 or more CRC error events, or one 0-900
Errored Seconds or more OOF events. This parameter displays the number of
severely errored seconds measured during the current
15-minute interval. The display is updated every second.
CURR UAS Current An unavailable second is any second in which a failed signal 0-900
Unavailable state exists. A failed signal state is declared when
Seconds 10 consecutive severely errored seconds (SES) occur, and is
cleared after 10 consecutive seconds of data are processed
without a SES. This parameter displays the number of
unavailable seconds measured during the current 15-minute
interval. The display is updated every second.
ESR Errored Seconds The ratio of errored seconds to the total seconds in the
Ratio current 15-minute interval.
Note: This parameter is not displayed on the LCD.
L.TERM BBE Long-Term This parameter displays the number of BBE measured during 0-65535
Background Block the current 24-hour interval. The display is updated every
Errors 15 minutes.
L.TERM ES Long-Term This parameter displays the number of errored seconds 0-65535
Errored Seconds measured during the current 24-hour interval. The display is
updated every 15 minutes.

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Table 5-5. Performance Monitoring Parameters (Cont.)

Display Name Description Range

L.TERM INT Long-Term This parameter displays the number of 15-minute intervals 0-96
Interval that have expired since the start of the current 24-hour
interval. The display is updated every 15 minutes.
L.TERM SES Long-Term This parameter displays the number of SES measured during 0-65535
Severely Errored the current 24-hour interval. The display is updated every
Seconds 15 minutes.
L.TERM UAS Long-Term Fail This parameter displays the number of UAS measured during 0-65535
Seconds the current 24-hour interval. The display is updated every
15 minutes.
SESR Severely Errored The ratio of severely errored seconds to the total seconds in
Seconds Ratio the current 15-minute interval.
Note: This parameter is not displayed on the LCD.

5.3 Diagnostic Tests

The user-controlled test functions of HTU-2 consist of diagnostic loopback tests.
You can run the tests from either the front panel or a control terminal. The
purpose of these loopback tests is to determine the source of a break in the data
flow. By checking a variety of data paths, a series of loopback tests can pinpoint
the source of the obstruction of data.
This section provides general instructions for running the tests, followed by a
description of each test.
If a loopback is already connected, the TST indicator lights. If you try to connect a
loopback while another loopback of the same type is already connected, HTU-2
displays an error message.
Operating Loopbacks from the Front Panel
The specific LCD designations for each test are listed in Table 5-6. For general
instructions on using the HTU-2 front panel, refer to Chapter 3.
➤ To activate or deactivate a specific test from the front panel:
1. Bring the CURSOR to the left-hand field in the top row (if it is not already
there).
2. Scroll to display TEST OPTION in the top row; the right-hand field of the top
row may show OFF (in this case the second row is empty) or HRPT (if a
repeater is installed in the line). OFF indicates that either no test is currently
active or a test is active but can be deactivated.
3. To enable the activation of a test (except for the local HRPT loopbacks), bring
the CURSOR to the right-hand field in the top row, and scroll to display
LOOP; the second row displays the first test option.

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4. Bring the CURSOR to the left-hand field in the second row, and scroll to
display the desired type of loopback; the second row shows the current state
of the selected test, OFF or ON.
To enable the activation of the H-RPT loop (available only for HTU-2
configured as central), bring the cursor to the right-hand field in the top row,
and scroll to display HRPT.
The second row displays LOCAL HRPT.
5. To change the test state, bring the cursor to the right-hand field in the second
row, and scroll to display the desired state (ON or OFF); the second row shows
the new state of the selected test (for instance, ON).
6. Press ENTER to activate or deactivate the displayed test; the TST indicator
lights if the test is activated, or goes off if no tests are active.
7. To simultaneously deactivate all the tests activated from this unit, perform
steps 1, 2, 3 above. In step 3, select OFF, then press ENTER. The TST LED
should turn off.
Activating the Diagnostic Loops from a Supervisory Terminal
The diagnostic loopbacks can be activated from a supervisory terminal by entering
the appropriate command.
For general instructions on entering HTU-2 commands from a supervisory
terminal, refer to Chapter 3. For specific instructions on activating loopback
commands, refer to Appendix G. This appendix lists all the terminal commands
available for HTU-2, in the alphabetical order.
Loopback Test Descriptions
The following paragraphs describe the loopbacks. Each paragraph includes an
explanation of the loopback function and how it works, along with its terminal
command and any other special instructions for operating the loopback.
The loopbacks are listed in the order set forth in Table 5-6. This table also lists the
terminal commands and LCD designations and brief purpose for each loopback.
Table 5-6. Loopback Tests

Terminal LCD Designation Purpose

Command Top Row Second
(Right) Row
LOOP L CH LOOP LOCAL Checks connections between the DTE and local HTU-2
CH
LOOP L HRPT LOCAL Checks connections to the equipment connected to the data
HRPT HRPT port of the HTU-2 unit configured as central, all the circuits of
both HTU-2 and H-RPT, and the transmission path connecting
the two units.
LOOP L LINE LOOP LOCAL Checks the operation of the local HTU-2 (without the two HDSL
LINE line interfaces) and the connections to the DTE.
LOOP R CH LOOP REM CH Checks the data link (including the cables connecting the two
units to the HDSL lines), the transmit path connecting the units,
and the cable connecting the DTE to the remote unit.

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Table 5-6. Loopback Tests (Cont.)

Terminal LCD Designation Purpose

Command Top Row Second
(Right) Row
LOOP R R LOOP REM REM Checks the data link (including the cables connecting the two
CH CH units to the HDSL lines), the transmit path connecting the units,
and the cable connecting the DTE to the local unit. Available
only for HTU-2 configured as central.

LOCAL CH
When activated, the local data channel loopback returns the signal received from
the DTE, after passing through the data channel interface of HTU-2.
The local loopback is formed by connecting the transmit signal, provided by the
data channel interface to the processing circuits, to the input of the receive path of
the data channel interface, as shown in Figure 5-1. The test signal is provided by
the DTE connected to HTU-2, which must receive its own transmission without
errors while the loopback is activated. During the loopback, the local HTU-2
continues sending the data to the HDSL link.
This test is generally used to check the connections between the DTE and HTU-2.

LOCAL HTU-2 HDSL REMOTE UNIT

Line A
HDSL Line A HDSL Line A
Interface Interface

User Processing User

Processing
Interface Interface
HDSL
Line B
HDSL Line B HDSL Line B
Interface Interface

Figure 5-1. LOCAL CH Loopback

Note The channel loopbacks (LOCAL CH, REM CH and REM REM CH) are not
recommended for HTU-2 channel with Ethernet interface. Although a channel
loopback is not forbidden in principle, it may cause a state of permanent collision
on the LAN (this would prevent other users from using the LAN as long as the
loopback is connected).

LOCAL HRPT
This local loopback on the HDSL repeater is performed as shown in Figure 5-2.
The loopback can be performed only from the HTU-2 unit configured as central.
This test fully checks the connections to the equipment connected to the data port
of the HTU-2 unit configured as central, all the circuits of both HTU-2 and H-RPT,
and the transmission path connecting the two units.
During the loopback, the remote unit continues to receive data sent from the
central unit.

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NTU Side LTU Side

Rx

Tx

Rx

Tx

Unit Configured H-RPT Unit Configured

as Central as Remote

Figure 5-2. LOCAL HRPT Loopback

LOCAL LINE
When activated, the local HDSL loopback returns the signal received from the
DTE, after passing through the data channel interface and the processing circuits of
HTU-2.
The local HDSL lines loopback is formed by connecting the digital HDSL transmit
signal provided by the processing circuits to the input of the processing circuits
receive path, thereby replacing the signals received by the HDSL line interfaces, as
shown in Figure 5-3. The test signal is provided by the DTE connected to the data
channel port, which must receive its own transmission without errors while the
loopback is activated.
This loopback can check the operation of the local HTU-2 (without the two HDSL
line interfaces) and the connections to the local DTE.

LOCAL HTU-2 REMOTE UNIT

HDSL
Line A
HDSL Line A HDSL Line A
Interface Interface

User User
Processing Processing
Interface Interface
HDSL
Line B
HDSL Line B HDSL Line B
Interface Interface

Figure 5-3. LOCAL LINE Loopback

Note • This loopback can be activated only from the unit configured as central.
• While this loopback is active, HTU-2 loses HDSL synchronization.

REM CH
When the remote data channel loopback is activated on the local HTU-2, the data
channel interface of the local HTU-2 returns the received data signal toward the
DTE connected to the data port of the remote HTU-2.
The remote loopback is performed by internally connecting the receive data signal
to the input of the transmit path. The received data signal remains connected to
the DTE connected to the data port of the local HTU-2, as shown in Figure 5-4.
The test signal is provided by the DTE connected to the data port of the remote
HTU-2 that must receive its own transmission without errors while the loopback is
activated.

Diagnostic Tests 5-19

Chapter 5 Troubleshooting and Diagnostics HTU-2 Installation and Operation Manual

This test fully checks the data link (including the cables connecting the two units to
the HDSL lines), the transmit path connecting the two units, and the cable
connecting the DTE to the remote unit.

LOCAL HTU-2 REMOTE UNIT

HDSL
Line A
HDSL Line A HDSL Line A
Interface Interface

User User
Processing Processing
Interface Interface
HDSL
Line B
HDSL Line B HDSL Line B
Interface Interface

Figure 5-4. REM CH Loopback

REM REM CH
When the remote remote channel port loopback is activated, the data port
interface of the remote appliance returns the received data signal toward the DTE
connected to the data port of the local HTU-2.
The remote remote loopback is performed by internally connecting the receive
data signal to the input of the transmit path. The received data signal remains
connected to the DTE connected to the data port of the remote unit, as shown in
Figure 5-5. The test signal is provided by the DTE connected to the data port of the
local HTU-2, which must receive its own transmission without errors while the
loopback is activated.
This test fully checks the data link, including the cables connecting the two units to
the HDSL lines, the transmit path connecting the two units, and the cable
connecting the DTE to the local HTU-2.
LOCAL HTU-2 REMOTE APPLIANCE
HDSL
Line A
HDSL Line A HDSL Line A
Interface Interface

User User
Processing Processing
Interface Interface
HDSL
Line B
HDSL Line B HDSL Line B
Interface Interface

Figure 5-5. REM REM CH Loopback

Note This loopback is available only for the unit configured as central.

5-20 Diagnostic Tests

Appendix A
Connector Wiring

A.1 HDSL Lines Connector

The HDSL lines are terminated in an eight-pin RJ-45 connector, designated
NETWORK HDSL, and wired in accordance with Table A-1.

Table A-1. NETWORK HDSL Connector Pin Assignment

Pin Function
1 Line A
2 Line A
3 Not Connected
4 Line B
5 Line B
6, 7, 8 Not Connected

A.2 DCE Interface Connectors and Adapter Cables

HTU-2 is supplied with one of the following DCE interfaces:
• RS-530
• V.36/RS-449/422
• V.35
• X.21
• G.703 (2048 kbps)
• Ethernet interface module (IR-ETH, IR-ETH/Q or IR-IP).

For description of their connectors and RAD cables matching them, refer to
Table 2-2 in Chapter 2. This section lists pinouts for the RS-530, V.35 and V.36
interfaces. For information about the IR-ETH, IR-ETH/Q, IR-IP, IR-X21B, and IR-E1
(2048 kbps) interface modules, refer to Appendix B, Appendix C, Appendix D,
Appendix E, Appendix F, respectively.

DCE Interface Connectors and Adapter Cables A-1

Appendix A Connector Wiring HTU-2 Installation and Operation Manual

RS-530 and V.36 Interfaces

When HTU-2 is ordered with an RS-530 DCE interface, the physical interface is a
25-pin female connector wired in accordance with Table A-2.

Table A-2. RS-530 DCE Connector Pin Assignment

Pin Designation Direction Function

1 FG ↔ Frame Ground
2 SDA To HTU-2 Send Data – wire A
3 RDA From HTU-2 Receive Data – wire A
4 RTSA To HTU-2 Request to Send (RTS) – wire A
5 CTSA From HTU-2 Clear to Send (CTS) – wire A
6 DSRA From HTU-2 Data Set Ready (DSR) – wire A
7 SG ↔ Signal Ground
8 DCDA From HTU-2 Carrier Detect (DCD) – wire A
9 RCB From HTU-2 Receive Clock – wire B
10 DCDB From HTU-2 Carrier Detect (DCD) – wire B
11 SCEB To HTU-2 Send External Clock – wire B
12 SCB From HTU-2 Send Clock – wire B
13 CTSB From HTU-2 Clear to Send (CTS) – wire B
14 SDB To HTU-2 Send Data – wire B
15 SCA From HTU-2 Send Clock – wire A
16 RDB From HTU-2 Receive Data – wire B
17 RCA From HTU-2 Receive Clock – wire A
18 LL To HTU-2 Local Loopback (V.54 Loop 3)
19 RTSB To HTU-2 Request to Send (RTS) – wire B
20 DTRA/RCEA To HTU-2 Data Terminal Ready(DTR) – wire A/Receive External Clock – wire A
21 RL To HTU-2 Remote Loopback (V.54 Loop 2)
22 DSRB From HTU-2 Data Set Ready (DSR) – wire B
23 DTRB/RCEB To HTU-2 Data Terminal Ready (DTR) – wire B/Receive External Clock – wire B
24 SCEA To HTU-2 Send External Clock – wire A
25 TM From HTU-2 Test Indicator

A-2 DCE Interface Connectors and Adapter Cables

HTU-2 Installation and Operation Manual Appendix A Connector Wiring

If you have ordered HTU-2 with a V.36/RS-449/422 interface, you receive a unit
with the RS-530 D-type 25-pin connector supplied with a RAD adapter cable
CBL 530/449F, which converts the RS-530 interface to the V.36/RS-449/422
interface (37-pin D-type male connector). Table A-3 shows the adapter cable
wiring.

Table A-3. V.36/RS-449/422 Adapter Cable Wiring

Pin Designation Direction Function V.36/RS-449/422

1 FG ↔ Frame Ground 1
2 SDA To HTU-2 Send Data – wire A 4
3 RDA From HTU-2 Receive Data – wire A 6
4 RTSA To HTU-2 Request to Send (RTS) – wire A 7
5 CTSA From HTU-2 Clear to Send (CTS) – wire A 9
6 DSRA From HTU-2 Data Set Ready (DSR) – wire A 11
7 SG ↔ Signal Ground 19
8 DCDA From HTU-2 Carrier Detect (DCD) – wire A 13
9 RCB From HTU-2 Receive Clock – wire B 26
10 DCDB From HTU-2 Carrier Detect (DCD) – wire B 31
11 SCEB To HTU-2 Send External Clock – wire B 35
12 SCB From HTU-2 Send Clock – wire B 23
13 CTSB From HTU-2 Clear to Send (CTS) – wire B 27
14 SDB To HTU-2 Send Data – wire B 22
15 SCA From HTU-2 Send Clock – wire A 5
16 RDB From HTU-2 Receive Data – wire B 24
17 RCA From HTU-2 Receive Clock – wire A 8
18 – N/A Not Connected –
19 RTSB To HTU-2 Request to Send (RTS) – wire B 25
20 RCEA To HTU-2 Receive External Clock – wire A –
21 – N/A Not Connected –
22 DSRB From HTU-2 Data Set Ready (DSR) – wire B 29
23 RCEB To HTU-2 Receive External Clock – wire B –
24 SCEA To HTU-2 Send External Clock – wire A 17
25 – N/A Not Connected –

DCE Interface Connectors and Adapter Cables A-3

Appendix A Connector Wiring HTU-2 Installation and Operation Manual

V.35 Interface
When HTU-2 is ordered with a V.35 DCE interface, the physical interface is a
34-pin female connector wired in accordance with Table A-4.

Table A-4. V.35 DCE Connector

Pin Designation Direction Function

A PG ↔ Protective Ground
B SG ↔ Signal Ground
C RTS To HTU-2 Request to Send
D CTS From HTU-2 Clear to Send
E DSR From HTU-2 Data Set Ready
F DCD From HTU-2 Data Carrier Detect
P TDA To HTU-2 Transmit Data – wire A
R RDA From HTU-2 Receive Data – wire A
S TDB To HTU-2 Transmit Data – wire B
T RDB From HTU-2 Receive Data – wire B
U ETCA To HTU-2 External Transmit Clock – wire A
V RCA From HTU-2 Receive Clock – wire A
W ETCB To HTU-2 External Transmit Clock – wire B
X RCB From HTU-2 Receive Clock – wire B
Y TCA From HTU-2 Transmit Clock – wire A
Z ERCB To HTU-2 External Receive Clock – wire B
AA TCB From HTU-2 Transmit Clock – wire B
BB ERCA To HTU-2 External Receive Clock – wire A

A-4 DCE Interface Connectors and Adapter Cables

HTU-2 Installation and Operation Manual Appendix A Connector Wiring

A.3 Control Port Connector

The HTU-2 control port has a standard RS-232 (V.24) interface. The physical
interface is a 9-pin female connector, designated CONTROL DCE and wired in
accordance with Table A-5.
Table A-5 also describes the connection to the RS-232 interface of a control
terminal, and the connection to a dial-out modem. The terminal and the modem
are assumed to have D-type 25-pin connectors.

Table A-5. Control Port Interface Signals

Pin of the Line Note Pin of Control Pin of Dial-Out

HTU-2 Terminal Modem
Connector Connector Connector
1 Data Carrier Detect (DCD) From HTU-2 8 4
2 Receive Data (RD) From HTU-2 3 2
3 Transmit Data (TD) To HTU-2 2 3
4 Data Terminal Ready (DTR) To HTU-2 20 6
5 Signal Ground (SIG) Common 7 7
reference and DC
power supply
ground
6 Data Set Ready (DSR) From HTU-2 6 20
7 Request to Send (RTS) To HTU-2 4 8
8 Clear to Send (CTS) From HTU-2 5 –

Control Port Connector A-5

Appendix A Connector Wiring HTU-2 Installation and Operation Manual

A-6 Control Port Connector

Appendix B
IR-ETH Interface Module

B.1 General Description

IR-ETH is an interface module for RAD modems, used for converting the Ethernet
(10BaseT or 10Base2) electrical levels to the modem TTL levels. It also converts the
Ethernet protocol to HDLC to enable long-distance transmission and avoid the
Ethernet collision limitation.
IR-ETH includes an internal, self-learning Ethernet bridge, which enables a high
performance link between two Ethernet segments at a low transmission rate. The
low-speed HDLC transmission is sent over the link using the modem modulation
technique. It is converted back to an Ethernet signal at the remote modem.
Figure B-1 shows a typical application using an Ethernet interface bridge. Each
modem is connected to an Ethernet network via the Ethernet interface bridge.

HTU-2 HTU-2

Figure B-1. Typical Application of HTU-2 with IR-ETH Module

B.2 IR-ETH Connector Options

Figure B-2 and Figure B-3 show the rear panel of HTU-2 with the IR-ETH interface
module (RJ-45 and BNC connectors). Table B-1 lists the RJ-45 connector pinout.

LINK RX

COLL TX

Figure B-2. Rear Panel of HTU-2 with IR-ETH Module (RJ-45 Connector)

IR-ETH Connector Options B-1

Appendix B IR-ETH Interface Module HTU-2 Installation and Operation Manual

RX

COLL TX

Figure B-3. Rear Panel of HTU-2 with IR-ETH Module (BNC Connector)

Table B-1. RJ-45 Pinout

Pin Function
3 RD (+)
6 RD (-)
1 TD (+)
2 TD (-)

B.3 Technical Specifications

General LAN Table 10,000 addresses
Filtering and Forwarding 15,000 pps
Buffer 256 frames
Delay 1 frame
LAN Standard Conforms to IEEE 802.3/Ethernet
Data Rate 10 Mbps (20 Mbps 10BaseT FDX)
Connectors • 10BaseT (UTP): Shielded RJ-45
• 10Base2: BNC connector
WAN Protocol HDLC
Data Rate According to the modem transmission rate

B-2 Technical Specifications

HTU-2 Installation and Operation Manual Appendix B IR-ETH Interface Module

B.4 Installation and Operation

Figure B-4 and Figure B-5 show the Ethernet bridge layout, the locations of the DIP
switches, and the rear panel components for the UTP and the BNC versions,
respectively.

Figure B-4. IR-ETH Layout (UTP Option)

Figure B-5. IR-ETH Layout (BNC Option)

Installation and Operation B-3

Appendix B IR-ETH Interface Module HTU-2 Installation and Operation Manual

Setting the DIP Switch

Table B-2 describes functions and default settings of the DIP switch SW-1 sections.
The function of section 1 is software-controlled either from the supervisory
terminal (DEF CH command), or from the front panel (CHANNEL PRM). This
section is permanently set to OFF and may not be set manually. Section 2 and
section 3 are set in accordance with Table B-2.
Table B-2. DIP Switch Settings

Section Name Description Default

Number Setting
1 SQ/FD ON – Full-duplex operation Permanently
OFF – Half-duplex operation OFF
2 CMP ON – Strips padding bits inserted in 64-byte frame
OFF – Transmits frames over WAN as is OFF
3 FIL ON – Passes only frames destined for another LAN
OFF – Disables LAN filter; passes all frames transparently OFF
Note: Set section 3 to ON if you want to filter the traffic sent to the remote end (recommended).

4 (nc)

LED Indicators
Table B-3 lists the IR-ETH LED indicators and describes their functions.

Table B-3. IR-ETH Bridge LED Indicators

LED Name Description Location Color

LINK ON – Good link integrity Rear panel Green
COLL ON – Collision occurred on the attached Ethernet segment Rear panel Yellow
RX ON – Data is received from the Ethernet attached segment Rear panel Yellow
TX ON – Data is transmitted from the modem to the Ethernet Rear panel Yellow
segment
ERR D4 ON – Bridge buffer overrun On the Red
IR-ETH board

Connecting to LAN
When connecting an IR-ETH interface module with the UTP option, use either a
straight cable or a cross-cable for the LAN connection. Use a cross-cable when
connecting to a port that does not implement the crossover function internally.
Otherwise, use a straight cable.
Note Hubs usually do implement the crossover function internally while network
interface cards and other devices do not.

B-4 Installation and Operation

Appendix C
IR-ETH/Q Interface Module

C.1 General
IR-ETH/Q is an interface module for RAD modems, used for converting the
Ethernet 10BaseT electrical levels to the modem TTL levels. It also converts the
Ethernet protocol to HDLC to enable long distance transmission and avoid the
Ethernet collision limitation. The IR-ETH/Q module also supports IEEE 802.1/Q
frames.
IR-ETH/Q includes an internal, self-learning Ethernet bridge, which enables a high
performance link between two Ethernet segments at a low transmission rate. The
module also supports VLAN applications. The low-speed HDLC transmission is
sent over the link using the modem modulation technique. It is converted back to
an Ethernet signal at the remote modem.
Figure C-1 shows a typical application using an Ethernet interface bridge. Each
modem is connected to an Ethernet network via the Ethernet interface bridge.

HTU-2 HTU-2

Figure C-1. Typical Application of HTU-2 with IR-ETH/Q Module

C.2 IR-ETH/Q Connector

Figure C-2 shows the rear panel of HTU-2, equipped with IR-ETH/Q module.
Table C-1 lists the module's RJ-45 connector pinout.

ACT

COLL

INT

Figure C-2. Rear Panel of HTU-2 with IR-ETH/Q Module

IR-ETH/Q Connector C-1

Appendix C IR-ETH/Q Interface Module HTU-2 Installation and Operation Manual

Table C-1. RJ-45 Connector Pinout

Pin Signal
3 RCV (+)
6 RCV (-)
1 XMT (+)
2 XMT (-)
– GND

C.3 Technical Specifications

General LAN Table 5,000 addresses
Buffer 200 kbytes
LAN Standard Conforms to IEEE 802.3/Ethernet and
supports IEEE 802.1/Q frames
Data Rate 10 Mbps (20 Mbps 10BaseT FDX)
Connectors 10BaseT (UTP): Shielded RJ-45
WAN Protocol HDLC
Data Rate According to the modem transmission rate

C-2 Technical Specifications

HTU-2 Installation and Operation Manual Appendix C IR-ETH/Q Interface Module

C.4 Installation and Operation

Figure C-3 shows the IR-ETH/Q rear panel and location of the S3 DIP switch.

6
5

Figure C-3. IR-ETH/Q Module Layout

Setting the DIP Switch

Configure the IR-ETH/Q module by setting the DIP switch in accordance with
Table C-2.

Table C-2. DIP Switch Settings

Section Name Description Default

Number Setting
1–4 – Reserved for future use. Must always be set to OFF. OFF
5 FD/HD ON – Ethernet bridge full-duplex mode OFF
OFF – Ethernet bridge half-duplex mode
Note: IR-ETH/Q does not support auto detection. Therefore, the equipment connected to IR-ETH/Q should
not be set to auto detection mode and the half/full duplex setting should be made manually.
6 TRANS/FIL OFF – Passes only frames destined for another LAN OFF
ON – Disables LAN filter; passes all frames transparently

Installation and Operation C-3

Appendix C IR-ETH/Q Interface Module HTU-2 Installation and Operation Manual

LED Indicators
Table C-3 lists the IR-ETH/Q LED indicators and describes their functions.

Table C-3. IR-ETH/Q LED Indicators

LED Description Color

Name
INT ON – Good link integrity Green
COLL ON – Collision on the attached Ethernet Red
segment
ACT ON – Data is received from the Ethernet Yellow
attached segment or data is transmitted
to the Ethernet segment

Connecting to LAN
Use either a straight cable or a cross-cable for the LAN connection.
Use a cross-cable when connecting to a port that does not implement the
crossover function internally. Otherwise, use a straight cable.
Note Hubs usually implement the crossover function internally, while network interface
cards and other devices do not.

C-4 Installation and Operation

 Appendix D
IR-IP Interface Module

D.1 Introduction

Overview
IR-IP is a high-performance, miniature IP router based on RAD's unique IP router
chip, the ChipRouter.
IR-IP works by taking each Ethernet frame from the LAN and determining whether
the IP packet is destined for the IP net on the Ethernet LAN. If not, IR-IP forwards
the packet to the WAN link. IP packets received from the WAN link are
automatically forwarded to the LAN if the IP net matches.
IR-IP includes hardware filters which handle all filtering operations at wire speed
from both LAN-to-WAN and WAN-to-LAN, without dropping a single packet.
Filtering and forwarding are performed at the maximum rate of 35,000 and
30,000 frames per second (wire speed), respectively. The buffer can hold
256 frames of maximum size of 1534 bytes and a throughput latency of one
frame.
IR-IP is available with 10BaseT (UTP) interface and is fully
IEEE 802.3/Ethernet v2 compliant. The IR-IP interface can also operate in full
duplex Ethernet applications.
HTU-2 equipped with IR-IP interface module can be used as a Frame Relay Access
Device (FRAD) with an integral IP router. RFC 1490 is supported for a single DLCI
on the WAN link. Detection of the DLCI and the maintenance protocol is
performed automatically. This allows the IR-IP to be used as the termination unit
of IP services over Frame Relay at the customer premises, opposite a Frame Relay
switch in the backbone.
Alternatively, Point-to-Point Protocol (PPP) can be run on the WAN link with
automatic negotiation on power-up, as well as support for PAP and CHAP
authentication. With this feature, IR-IP can operate opposite any PPP compliant
access server or backbone router.
IR-IP supports HDLC, which is especially important for broadcast and multicast
applications where bandwidth overhead is critical.
IR-IP supports IP multicast at wire speed, making it suitable for any multicast
environment including high speed downstream environments, such as satellite and
xDSL. Users on the LAN who register with IR-IP for an IP multicast group using the
IGMP protocol filter IP multicast packets at wire speed.
Management and advanced configuration are performed via Telnet.

Introduction D-1
Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

Application
Figure D-1 shows a typical application of the HTU-2 modem equipped with the
IR-IP interface module.

HTU-2 HTU-2 Router

with IR-IP with V.35 Interface

Figure D-1. Typical Application of the HTU-2 Unit with IR-IP

D.2 Technical Specifications

Router LAN IP Net Up to 256 hosts on LAN IP net
Filtering and 30 kbps / 35 kbps
Forwarding
Buffer 256 frames (maximum size – 1534 bytes)
Delay 1 frame
LAN Standard Conforms to IEEE 802.3/Ethernet v2
Data Rate 10 Mbps (20 Mbps 10BaseT in full duplex
topology)
Connector 10BaseT (UTP): Shielded RJ-45
WAN Protocols • PPP (PAP/CHAP)
• Frame Relay (RFC 1490)
• HDLC

D.3 Physical Description

Figure D-2 shows the rear panel of HTU-2 with the IR-IP interface module.

ACT

ERR

INT

Figure D-2. Rear Panel of HTU-2 with the IR-IP Module

D-2 Physical Description

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

IR-IP LEDs
IR-IP contains three LEDs, which indicate the module activity. Table D-1 lists the
LEDs functions.

Table D-1. IR-IP LEDs Functions

Name Type Function

INT Green LED ON – LAN integrity is established.
ACT Yellow LED Blinks – Transmit/receive activity is detected on the
Ethernet link.
ERR Red LED ON – Buffer overflow occurred (during normal operation).
During power-up, provides additional indications,
described below.

IR-IP DIP Switch

IR-IP interface module contains a four-section DIP switch, as seen in Figure D-3.
Table D-2 lists the DIP switch functions.

Figure D-3. IR-IP DIP Switch

Table D-2. IR-IP DIP Switch Functions

No Function Values Default Setting

1 Enables IR-IP to learn its IP ON – IP address learning is enabled
OFF – IP address learning is disabled OFF
2 Selects the WAN protocol ON – PPP protocol
OFF – Frame Relay protocol OFF
3 Selects the LAN mode ON – Full duplex operation
OFF – Half duplex operation OFF
4 Controls the remote WAN test ON – The test loopback is activated
loopback, which returns packets
OFF – The test loopback is disabled OFF
received from the WAN back
toward the WAN

Physical Description D-3

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

Table D-3 provides the pinout of the IR-IP RJ-45 connector.

Table D-3. RJ-45 Pinout

Pin Name Function

1 TD (+) Transmit data positive
2 TD (-) Transmit data negative
3 RD (+) Receive data positive
6 RD (-) Receive data negative

D.4 IR-IP Management Subsystem, General

Introduction
The IR-IP interface module management subsystem supports the following
functions:
• Preliminary configuration
• Configuration of management access parameters
• Advanced configuration of IR-IP parameters
• Collection and display of statistical performance data
• Maintenance functions, which include:
ƒ Software downloading
ƒ Resetting of various subsystems
ƒ Display of error log
ƒ Ping utility, for checking IP connectivity.

The management subsystem of the IR-IP interface module is a separate,

independent entity, and therefore it cannot be managed through the HTU-2
management subsystem.
The communication with the IR-IP management subsystem is made through the
local LAN interface connector of the IR-IP module, designated 10BASE-T, using
the Telnet protocol. Passwords can be used to prevent unauthorized access.
Accessing the IR-IP Management Subsystem
The IR-IP interface module must be configured in accordance with the specific
requirements of the user’s application before it can be used in the user’s network.
As a result, it is not possible to supply default parameters to enable IR-IP to start
service without any preliminary configuration.

D-4 IR-IP Management Subsystem, General

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

Therefore, to enable the user to establish Telnet communication and configure

IR-IP, IR-IP is delivered with a factory-default set of parameters. The factory-default
parameters are automatically used:
• Before the IP router is configured by the user, e.g., when a new HTU-2 with
IR-IP interface module is put into operation
• After the user’s configuration parameters have been erased.

When the factory-default parameters are used, the ERR indicator located on the
HTU-2 rear panel, near the IR-IP Ethernet interface connector flashes rapidly
(about three times per second).
Note The flashing of the ERR indicator also serves as a warning to the user that the IR-IP
WAN interface does not send, nor does it receive packets, and therefore IR-IP can
be accessed only from the LAN.
After configuring IR-IP, it starts normal operation and routes the traffic in
accordance with the user-selected configuration parameters.
To change the parameters of an already-configured IR-IP, establish communication
from a Telnet host using the assigned IP address.
Default IP Communication Parameters
The factory-default IP communication parameters of the interface module are:
• The default IP address of the IR-IP Ethernet port is 192.168.205.1, and the
default IP subnet mask is 255.255.255.252.
• The port will accept IP communication only from the IP address
192.168.205.2. Therefore, as long as the factory defaults are in effect, you
must assign this address to the Telnet host used to configure IR-IP.

Using the IP learning mechanism, as explained below you can change the default
parameters.
Note In the default configuration, the IR-IP WAN interface is disabled. In order to enable
the WAN interface, you have to modify the Ethernet port address or the IP subnet
mask.

D.5 Performing Preliminary Configuration

General
The software necessary for performing all the management and configuration
functions is stored in the IR-IP interface module, and therefore you only need a
regular Telnet host to perform all the activities described in this appendix.

Performing Preliminary Configuration D-5

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

A Telnet host is any computer, e.g., an IBM PC or compatible that fulfills the
following minimum requirements:
• A standard 10BaseT Ethernet interface
• A TCP/IP protocol stack, and therefore is capable of supporting IP
communication through the Ethernet interface
• Telnet client software
• A ping utility.

Outline of Preliminary Configuration

➤ To perform the preliminary configuration procedure:
1. Connect the Telnet host to the IR-IP interface module.
2. Configure the Telnet host to enable communication with the IR-IP interface
module using the default IP parameters.
3. Establish communication with IR-IP and assign the prescribed IP address to its
LAN interface.
4. Establish again communication with IR-IP and continue the preliminary
configuration in accordance with the Quick Setup Menu section below.
Connecting the Telnet Host
Before starting the management and configuration activities, it is necessary to
establish IP communication between your Telnet host and the IR-IP interface
module. For this purpose, it is necessary to provide a communication path.
Because of the method used to assign an IP address to IR-IP Ethernet port, it is
recommended to connect the Telnet host directly to the IP router 10BASE-T
connector. This is made by connecting an Ethernet cross cable between the
Ethernet connector of the Telnet host and the IP router connector.
However, you may also connect through a common LAN: in this case, connect
your Telnet host and IR-IP to Ethernet hub ports using straight cables.
Preliminary Telnet Host Configuration
You can use the IP learning mechanism to configure the IP communication
parameters of the IR-IP LAN interface. In this case, skip to the Assigning the Router
LAN Interface Address section below.
If you prefer to use the factory-default parameters to establish IP communication
between your Telnet host and IR-IP, configure the Telnet host as follows:
1. Temporarily configure the host IP address as 192.168.205.2.
2. The initial destination IP address to be used by the host is 192.168.205.1.
Note The first step in the preliminary configuration process is to assign the desired IP
address to the LAN interface of the IR-IP interface module.
After an IP address is assigned and saved, you must change the destination IP
address of the Telnet host to the new address, otherwise it is not possible to
continue the configuration process. At the same time, you can also change the
temporary IP address assigned to the host (192.168.205.2) back to its permanent
address.

D-6 Performing Preliminary Configuration

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

Assigning the Router LAN Interface Address

The IP address of the IR-IP LAN interface must be configured as part of the
preliminary configuration process. To simplify this process, IR-IP includes a simple
and convenient IP address learning mechanism.
The IP address can be configured and changed at any time, even after the
complete IR-IP configuration process has been performed, because it does not
affect other configuration parameters. Moreover, the IP subnet mask is
automatically adapted to the new IP address.

IP Learning Mechanism
To simplify the configuration process, IR-IP has a special mechanism for
configuring the IP address of its LAN interface. Setting section 1, called IP address
learning, of the IR-IP DIP switch (Figure D-3) to ON enables this mechanism.
The IP learning mechanism enables IR-IP to learn its LAN interface IP address by
receiving frames sent by a ping utility to the prescribed LAN IP address.
Note
To use the IP learning mechanism, you do not need to know the current address of
IR-IP LAN interface, but only the prescribed IP address.
The IP address is actually retrieved from the ARP frames sent during pinging to
locate the ping destination, not from the ping frames.
To ensure that the process is correctly performed, it is recommended to check the
contents of the ARP table before starting the ping utility, to make sure that it does
not contain the address to be assigned to the IP router LAN interface.
➤ To view and edit the ARP table contents:
If the Telnet host you are using runs under Microsoft Inc. Windows™ 95, 98 or
NT, use the following procedure to view and edit the ARP table contents:
1. Display the table using the arp -a command.
2. If the table includes the intended IP address, remove it from the table using
the arp -d command.
If for some reason the IP learning process does not succeed, before repeating it
make sure to remove the IP address from the table.

Assigning a LAN IP Address to a New IR-IP

The following procedure enables you to configure the LAN IP address of a new
IR-IP router, i.e., a router using the default parameters (see the Accessing the IR-IP
Management Subsystem section above).
If HTU-2 is already operating, skip Step 2 in the following procedure.
➤ To configure the IP router LAN address:
1. Make sure the preparations described above have been completed, including
the configuration of the ping utility.
2. Turn HTU-2 on and monitor the IP router indicators:
ƒ The INT indicator turns on

Performing Preliminary Configuration D-7

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

ƒ The ERR indicator lights steadily for approx. 15 seconds, and then starts
flashing at a rapid rate (about three times per second).
If the ERR indicator turns off, skip to the What to Do If ... section below.

3. Set section 1 of IR-IP DIP switch to ON.

The ERR indicator starts flashing faster (approximately four times a second).
4. Send a ping to the new address to be used by IR-IP. A confirmation should be
received after the third ping: after the confirmation, the flashing will slow
down to approximately twice a second.
If your host does not begin to receive ping replies after three unsuccessful
attempts, skip to the What to Do If ... section below.
5. Return section 1 of the IR-IP DIP switch to the OFF position.
The ERR indicator must turn off.
At this stage, the communication with IR-IP router is lost, because its IP address
has been changed. Therefore, you must reconfigure the destination IP address of
the Telnet host. If you wish, you may also change the temporary IP address
assigned to the host (192.168.205.2) back to its permanent address.
After changing the destination IP address of the Telnet host, it is recommended to
turn HTU-2 off for a few seconds and then back on, before continuing the
configuration of the IP router in accordance with the Quick Setup Menu section
below. At this time, in Step 2 the ERR indicator turns off after the 15-second
interval.

Changing the LAN IP Address of a Configured IR-IP

The LAN IP address of an already-configured IR-IP can be changed while it
operates, this means it is not necessary to turn HTU-2 off before starting the
configuration procedure. Note however that the IP traffic flow through IR-IP will
be disrupted until the other stations in the IP network learn the new address.
To change the LAN IP address of an already-configured IR-IP, use the procedure
described above for a new IR-IP with the following differences:
1. Configure the destination address of the ping utility to the new LAN interface
IP address. It is not necessary to change the Telnet host source address.
2. When ready, set section 1 of the IR-IP DIP switch to ON.
The ERR indicator starts flashing faster (approximately four times a second).
3. Perform Steps 4, 5 of the procedure used for a new IR-IP.

What to Do If ...
➤ The INT indicator does not light immediately after HTU-2 is turned on
The IR-IP interface module does not receive power from the HTU-2 power supply.
Service is required.
Note After the power-up process ends, the INT indicator shows LAN integrity. It may stay
turned off without indicating power supply failure.

D-8 Performing Preliminary Configuration

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

➤ The ERR indicator does not light immediately after HTU-2 is turned on
IR-IP is faulty and must be replaced.
➤ After turn-on, the ERR indicator lights for 15 seconds and then turns off. ACT
does not light, and there is no response from IR-IP
No software loaded into IR-IP. Download software using the procedure described
in the New Software Download Menu section below.
➤ After turn-on, the ERR indicator lights for 15 seconds, and then turns off. ACT
lights from time to time, but there is no response from IR-IP
IR-IP has been configured. If you do not know the current IP address of the LAN
interface, erase IR-IP router configuration using the procedure given in the Erasing
User’s Configuration section below.
➤ No ping replies from IR-IP
If your host does not begin to receive ping replies after three unsuccessful
attempts, check the physical connection path between the Telnet host Ethernet
interface and the IR-IP 10BASE-T connector.
➤ The IP learning process is not successful
Check that the prescribed IP address does not appear in the ARP table.

D.6 IR-IP Management Utility

General Operating Procedures
The IR-IP interface module is managed via a simple, menu-driven utility that uses a
basic terminal user interface. A typical screen is shown in Figure D-4.
As seen in Figure D-4, each screen has a header that identifies the device being
configured and its logical name, assigned by the user, followed by the running
software revision and date. The bottom line of the screen displays prompts that
guide you in the execution of the various activities.
Use the following general procedures to perform the desired activity:
• To change a parameter or to select a menu item, type the corresponding line
number.
• For a parameter, which has a discrete set of values, the parameter values are
enclosed in brackets [ ]. To select a new value, press the spacebar to scroll
among the available values until the desired value is displayed, and then press
<Enter> to select the displayed value.
• To enter a value which requires free text entry, type in the desired string and
then press <Enter>. Use backspace to erase the current string.
• After all the parameters have been selected, a prompt appears, requesting that
you confirm the changes.

Note For proper display of the screens, you must:

• Select a fixed-pitch system font for the display. Use your operating system
documentation to find how to select a proper font.
• Configure the Telnet utility to use VT-100 terminal emulation.

IR-IP Management Utility D-9

 Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

Starting a Management Utility

The management utility is started automatically when Telnet communication is
established. If password protection is enabled (see the Management Access Menu
section below), you will be prompted to enter the Telnet password. The opening
screen, which appears after the Telnet session activation, is the IR-IP Main menu
(see Figure D-4).
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

1. Quick Setup
2. Management Access
3. Advanced Setup
4. Device Control
5. View
6. Diagnostic Tool (PING terminal)

Press one of the numbers to select or ESC:

Figure D-4. IR-IP Main Menu

To end the utility, press <Esc> when the Main menu is displayed. This will also
end the Telnet session.
Menu Structure of Management Utility
Figure D-5 shows the menu structure of the IR-IP management utility.
Main Menu

1. Quick Setup 2. Management 3. Advanced Setup 4. Device Control 6. Diagnostic Tool

5. View
Access PING Terminal

1.Telenet Password 1. Device Identification 1. New Software Download 1. Configuration and Connection 1. Ping IP Address
2. Telenet Activity Timeout 1. Device Name 1. Server IP Address 2. ARP Tables 2. Start Pinging
3. SNMP Access 2. Contact Person 2. File Name 3. Multicast Groups Table 3. Stop Pinging
4. SNMP Read Community 3. System Location 3. Total Timeout 4. Statistics
5. SNMP Write Community 4. Start Operation
6. SNMP Trap Community
7. SNMP Management Table 2. Interface Parameters
1. LAN Status 2. View Error Log
2. WAN Status
3. WAN Throttle
4. Aging Timeout 3. Resets
1. LAN IP Address
2. LAN IP Mask 1. Reset Device
3. WAN IP Address 3. Protocol Parameters (FR) 2. Reset LAN
4. WAN IP Mask 1. Self Learn 3. Reset WAN
5. Default Gateway 2. Maintenance Protocol
6. Read Protocol From DIP Switches 3. DLCI
7. Protocol 4. CIR
5. EIR

3. Protocol Parameters (PPP)

1. Header and Control Field Compression
2. Protocol Field Compression
3. Authentication Protocol
4. Security Host/Guest
5. User Name To Send
6. Password To Send
7. User Name To Accept
8. Password To Accept

4. Multicast
1. Multicast Forwarding
2. Static Groups

Figure D-5. Management Utility, Menu Structure

D-10 IR-IP Management Utility

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

D.7 Quick Setup Menu

The Quick Setup menu is used to select the main parameters’ values that must be
defined before you start using IR-IP.
Use the Advanced Setup menu (see the Advanced Setup Menu section below) to
specify values for other IR-IP configuration parameters not included in this menu.
➤ To access the Quick Setup menu:
• From the Main menu, type 1.
The Quick Setup menu appears (Figure D-6).
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)
Quick Setup
=====================================================================
1. LAN IP Address :192.168.100.001
2. LAN IP Mask :255.255.255.000
3. WAN IP Address (empty for unnumbered) :...............
4. WAN IP Mask (empty for unnumbered) :...............
5. Default Gateway (empty - WAN interface) :...............
6. Read Protocol From DIP Switches :[ Yes ]
7. Protocol :[ Frame Relay ]

Press one of the numbers to select or ESC:

Figure D-6. Quick Setup Menu

LAN IP Address
Used to enter the IP address for the IP router LAN interface. This is the address to
which nodes connected to the local LAN send packets addressed to the WAN.
LAN IP Mask
Used to enter the IP subnet mask. The IP router supports a maximum of 254 hosts
on the LAN, therefore you must use Class C subnet masks. The basic subnet IP
mask for Class C addresses, which supports the maximum possible number of
hosts, 254, is 255.255.255.0. To help you understand the selection of IP subnet
masks, Figure D-7 provides a configuration example for a LAN with 6 nodes: the IP
subnet mask for a 6-node IP network is 255.255.255.248.
HTU-2 with IR-IP

LAN IP Address: 192.168.1.2

Mask: 255.255.255.248

IP Address 192.168.1.2 .3 .4 .5 .6
Mask 255.255.255.248 .248 .248 .248 .248
Default Gateway 192.168.1.1 192.168.1.1 192.168.1.1 192.168.1.1 192.168.1.1

Figure D-7. Selecting the IP Subnet Mask

Quick Setup Menu D-11

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

WAN IP Address
Used to enter the IP address for the IR-IP WAN interface, i.e., the IP address to be
used by IP hosts on the WAN to reach this IR-IP interface module.
If the WAN IP Address field remain blank, IR-IP operates in the Unnumbered
Router Mode.
WAN IP Mask
Used to enter the IP subnet mask for the WAN interface.
Default Gateway

Operation without Default Gateway

The IP interface module is intended to enable the extension of LANs through the
HTU-2 link. Therefore, its default routing operation is different from the default
routing operation of standard IP routers:
• IR-IP forwards packets with destinations not located on the local LAN through
the WAN interface
• Packets received from the WAN interface and destined to hosts located on the
local LAN are forwarded to the LAN; other packets are discarded.

The default operation is used when the Default Gateway field is blank.

Operation with Default Gateway

You can instruct IR-IP to send packets with destinations not located on the local
LAN to a specific router, which is called the default gateway. The default gateway
must be connected to the local LAN.
To use this option, enter the IP address of another router attached to the local LAN
in the Default Gateway field.

Note
It is very important to obtain the correct parameters from the system administrator
or ISP. The most common problem when establishing an IP connection is incorrect
configuration of IP parameters and default gateway. Do not try to guess these
parameters.

Reading Protocol from DIP Switches

Selecting YES for this parameter forces IR-IP router card to use the WAN protocol
selected by section 2 of its DIP switch: PPP or Frame Relay.
If you want to be able to select the WAN protocol by means of the Protocol field
(parameter 7) of the Quick Setup menu, select NO.
Protocol
Used to select the WAN protocol to be used by the IP router card: PPP, HDLC or
Frame Relay.
This parameter is available only if the Read Protocol from DIP Switches parameter
is set to NO.

D-12 Quick Setup Menu

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

D.8 Management Access Menu

The Management Access menu is used to enable the use of passwords to protect
the access to IR-IP management utility, and control the inactivity time-out interval.
When password protection is enabled, a Telnet management session can start only
after the correct password is entered.
➤ To access the Management Access menu:
• From the Main menu, type 2.
The Management Access menu appears (Figure D-8).
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Quick Setup
Management Access
=====================================================================
1. Telnet Password :..........
2. Telnet Inactivity Timeout (min) :300..
3. SNMP Access :Disabled
4. SNMP Read Community :public....
5. SNMP Write Community :public....
6. SNMP Trap Community :public....
7. SNMP Management Table :>>>

Press one of the numbers to select or ESC:

Figure D-8. Management Access Menu

Note Since the IP router card does not support SNMP management, the SNMP Read
Community, SNMP Write Community, SNMP Trap Community, and SNMP
Management Table parameters are not used.

Telnet Password
By default, management access to IR-IP via Telnet is unrestricted. To restrict
access, enter a Telnet password by selecting 1 in the Management Access menu.
The password can include up to 10 characters, and is case-sensitive. The next time
a Telnet session is opened, a password must be entered to enable you to access
the IR-IP menus.
At any time, only one Telnet connection to IR-IP is permitted. Any attempt to
open an additional connection while the current session is open is rejected.
Telnet Inactivity Timeout
This parameter specifies the time a Telnet session is kept open when there is no
keyboard activity. When the specified time-out expires, the Telnet session is closed
and another user can access IR-IP.

Management Access Menu D-13

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

D.9 Advanced Setup Menu

The Advanced Setup menu is used to select the desired group of IR-IP
configuration parameters.
The parameters accessed through Advanced Setup menu supplement the
parameters available on the Quick Setup screen, by providing control over all the
other IR-IP parameters.
➤ To access the Advanced Setup menu:
• From the Main menu, press 3.
The Advanced Setup menu appears (Figure D-9).
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Quick Setup
Management Access
Advanced Setup
=====================================================================
1. Device identification
2. Interface Parameters
3. Protocol Parameters
4. Multicast IP
Press one of the numbers to select or ESC:

Figure D-9. Advanced Setup Menu

Device Identification Menu

The Device Identification menu is used to define and store in the IR-IP logistic
information: the logical name of IR-IP, information on the contact person and
device location.
➤ To access the Device Identification menu:
• From the Advanced Setup menu, type 1.
The Device Identification menu appears (Figure D-10).
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Quick Setup
Management Access
Advanced Setup
.....................................................................
Device identification
=====================================================================
1. Device Name :IR-IP..
2. Contact Person :Name of contact Person
3. System Location :The location of this device

Press one of the numbers to select or ESC:

Figure D-10. Device Identification Menu

D-14 Advanced Setup Menu

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

Device Name
Select this parameter to assign an arbitrary name to IR-IP for identification by the
system manager (up to eight characters). The assigned name is displayed in the
screen header.

Contact Person
Select this parameter to enter the name of the person to be contacted with matters
pertaining to this equipment unit.

System Location
Select this parameter to enter the physical location of the device.
Interface Parameters Menu
The Interface Parameters menu is used to control the operation of IR-IP interfaces.
➤ To access the Interface Parameters menu:
• From the Advanced Setup menu, type 2.
The Interface Parameters menu appears (Figure D-11).
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Quick Setup
Management Access
Advanced Setup
.................................................................
Device identification
Interface Parameters
=================================================================
1. LAN Status :[ Open ]
2. WAN Status :[ Open ]
3. WAN Throttle :[ Full ]
4. Aging Timeout (min) :5.

Press one of the numbers to select or ESC:

Figure D-11. Interface Parameters Menu

LAN Status
Used to enable/disable the flow of packets through LAN interface:
• Open – the flow of packets is enabled.
• Closed – the flow of packets is disabled. As a result, IR-IP does not accept, nor
sends packets to the LAN, but its WAN interface may still be active, and can
interact with other IP hosts on the WAN.

Advanced Setup Menu D-15

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

WAN Status
Used to enable/disable the flow of packets through the WAN interface:
• Open – the flow of packets is enabled.
• Closed – the flow of packets through the WAN interface is disabled. As a
result, IR-IP does not accept from, nor sends packets to the WAN. However,
the LAN interface of the IP router is still active.

WAN Throttle
This parameter specifies the maximum data rate at which frames are sent to the
WAN (i.e., to the HDSL link).
The available selections are:
• 64 kbps
• 128 kbps
• 256 kbps
• 512 kbps
• 1024 kbps
• Full (no restriction on the rate).

Since the IP router buffers have a limited capacity (256 frames), it is recommended
to select the WAN Throttle parameter in accordance with the line rate.

Aging Timeout
Used to specify the time after which inactive LAN stations are removed from the
IR-IP ARP table.
A station is defined as inactive when no IP traffic is received from it by the IR-IP
LAN interface.
WAN Protocol Parameters – Frame Relay Protocol Menu
The Frame Relay Protocol Parameters menu is used to configure the parameters
Frame Relay WAN for protocol (the WAN protocol is selected by means of the
Quick Setup Menu) in Figure D-6.
➤ To access the Protocol Parameters menu:
• From the Advanced Setup menu, type 3.

Self Learn
Used to specify whether the Frame Relay DLCI and maintenance protocol is
learned automatically (ENABLED), or is manually entered (DISABLED).

Maintenance Protocol
When the Self Learn parameter is DISABLED, use this parameter to specify the
desired maintenance protocol.

D-16 Advanced Setup Menu

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

DLCI
When the Self Learn parameter is DISABLED, use this parameter to specify the
DLCI used for exchanging maintenance protocol messages.

CIR
Used to specify the maximum amount of data, in bits, which the Frame Relay
network guarantees to transfer during the measurement interval (the measurement
interval is usually one second).
The value of this parameter is obtained from your Frame Relay service provider.

EIR
Used to specify the maximum amount of data, in bits, that the Frame Relay
network will attempt to deliver during the measurement interval. The value of this
parameter is obtained from the Frame Relay service provider.
A typical Frame Relay Protocol Parameters menu is shown in Figure D-12.
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Quick Setup
Management Access
Advanced Setup
.....................................................................
Device identification
Interface Parameters
Protocol Parameters
=====================================================================
1. Self Learn :[ Enabled ]
2. Maintenance Protocol :[ ANSI T1.617 ANNEX D ]
3. DLCI (0-None) :0..
4. CIR :0.......
5. EIR :64000...

Press one of the numbers to select or ESC:

Figure D-12. Frame Relay Protocol Parameters Menu

WAN Protocol Parameters – PPP Protocol

The PPP Protocol Parameters menu is used to configure the parameters PPP WAN
for protocol (the WAN protocol is selected by means of the (the WAN protocol is
selected by means of the Quick Setup Menu) in Figure D-6.
➤ To access the Protocol Parameters menu:
• From the Advanced Setup menu, type 3.

Header and Control Field Compression

Used to control the use of header and control field compression type according to
RFC 1661. It is strongly recommended that this compression be used for
troubleshooting only.

Advanced Setup Menu D-17

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

Protocol Field Compression

Used to control the use of protocol field compression type according to RFC 1661.
It is strongly recommended that this compression be used for troubleshooting only.

Authentication Protocol
Used to select the authentication protocol used by an IP router configured as host
to validate incoming connections.

Security Host/Guest
This option can be used to configure the IP router either as a guest unit, to be
authenticated by another router, or as a host unit, that authenticates other routers.

User Name To Send

The name by which an IP router card configured as guest identifies itself.

Password To Send
The password by which an IP router card configured as guest identifies itself.

User Name To Accept

The user name to be accepted by an IP router configured as host, when an
incoming connection request is received.

Password To Accept
The user password to be accepted by an IP router configured as host, when an
incoming connection request is received.
A typical PPP Protocol Parameters menu is shown in Figure D-13.
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Quick Setup
Management Access
Advanced Setup
.....................................................................
Device identification
Interface Parameters
Protocol Parameters
=====================================================================
1. Header and Control Field Compression :[ No ]
2. Protocol Field Compression: :[ No ]
3. Authentication Protocol :[ NONE/NONE ]
4. Security Host / Guest :[ Guest ]
5. User Name To Send :.................
6. Password To Send :.................
7. User Name To Accept :.................
8. Password To Accept :.................

Press one of the numbers to select or ESC:

Figure D-13. PPP Protocol Parameters Menu

D-18 Advanced Setup Menu

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

Multicast IP Menu
The Multicast IP menu is used to specify the IP multicast frame forwarding
parameters, and to access the static multicast groups’ table.
➤ To access the Multicast IP menu:
• From the Advanced Setup menu, press 4.
The Multicast IP menu appears (Figure D-14).
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Quick Setup
Management Access
Advanced Setup
.....................................................................
Device identification
Interface Parameters
Protocol Parameters
Multicast IP
=====================================================================
1. Multicast forwarding :[ Disable ]
2. Static groups :>>>

Press one of the numbers to select or ESC:

Figure D-14. Multicast IP Menu

Multicast Forwarding
Used to control the forwarding of IP multicast frames. The following selections are
available:
• DISABLED – Disables multicast forwarding in both directions.
• LAN to WAN – Enables forwarding of IP multicast frames addressed to groups
appearing in the Static Multicast Groups table, from the LAN to the WAN.
• WAN to LAN – Enables forwarding of IP multicast frames addressed to groups
appearing in the Static Multicast Groups table, from the WAN to the LAN.
• BIDIRECTIONAL – Enables forwarding of IP multicast frames addressed to
groups appearing in the Static Multicast Groups table, in both directions.
• WAN to LAN + IGMP – Enables forwarding of IP multicast frames addressed to
groups appearing in the Static Multicast Groups table, from the WAN to the LAN.
In addition, more groups can be added dynamically (the additional can be viewed
using the View menu – Figure D-19).
• TRANSPARENT – All the IP multicast frames are forwarded, irrespective of the
Static Multicast Groups table.

Advanced Setup Menu D-19

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

Static Groups
Select this parameter to access the static multicast groups table. The table is used
to specify the IP addresses for up to 10 IP multicast groups. You can add, change,
or delete each entry in the table (see the prompt line).
➤ To access the Static Groups menu:
• From the Multicast IP menu, type 2.
The following screen appears:
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Static Multicast Groups Table

-----------------------------
Group IP Address
1. ................
2. ................
3. ................
4. ................
5. ................
6. ................
7. ................
8. ................
9. ................
10. ...............

Press 'A'-add, 'E'-edit, 'D'-delete, 'C'-clear all, 'ESC'-exit:

Figure D-15. Static Multicast Groups Table

D.10 Device Control Menu

The Device Control menu is used to download software from TFTP servers and
perform interface and device resets.
➤ To access the Device Control menu:
• From the Main menu, type 4.
The Device Control menu appears (Figure D-16).
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)
Quick Setup
Management Access
Advanced Setup
Device Control
----------------------------------------------------------
1. New Software Download
2. View error LOG
3. Resets
Press one of the numbers to select or ESC:

Figure D-16. Device Control Menu

D-20 Device Control Menu

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

New Software Download Menu

IR-IP operates as a TFTP client, and therefore it is possible to update its software
by downloading new software from another computer that operates as a TFTP
server.
The New Software Download menu is used to specify the software downloading
parameters.
➤ To access the New Software Download menu:
• From the Device Control submenu, type 1.
New Software Download menu appears (Figure D-17).
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Quick Setup
Management Access
Advanced Setup
Device Control
.....................................................................
New Software Download
=====================================================================
1. Server IP Address :...............
2. File Name :...................
3. Total Timeout (sec) :..
4. Start operation :>>>
Press one of the numbers to select or ESC:

Figure D-17. New Software Download Menu

Server IP Address
Used to enter the IP address of the TFTP server.

File Name
Used to enter the name and path of the file to be transferred from the TFTP server.

Total Timeout
Used to enter the time IP router should wait for an acknowledgment from the
TFTP server, for example 60 seconds.

Start Operation
After selecting all the necessary parameters, type 4 on the New Software
Download screen and then press <Enter> to start the downloading.
You can follow the progress of the downloading process (indicated by arrows).
Upon completion of the download process, the unit performs a reset. The Telnet
connection is lost and must be restarted if required.

Device Control Menu D-21

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

View Error Log Screen

This item of the Device Control submenu is used to view the error log file. This file
logs errors detected in IR-IP for debug and technical support purposes.
Resets Menu
The Resets menu allows you to perform reset of IR-IP, or its interfaces.
This operation can be used to restore normal operation after service is disrupted
by an abnormal condition. Any data stored in the IR-IP buffers is discarded, and
the flow of traffic is temporarily interrupted.
➤ To access the Resets menu:
• From the Device Control menu, type 3.
The following screen appears:
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Quick Setup
Management Access
Advanced Setup
Device Control
.....................................................................
New Software Download
View error LOG
Resets
=====================================================================
1. Reset Device
2. Reset LAN
3. Reset WAN
Press one of the numbers to select or ESC:

Figure D-18. Resets Menu

Reset Device
➤ To restart IR-IP:
• From the Resets menu, type 1.
You will be prompted to confirm the reset operation.
Note Resetting the device will restart the IR-IP interface module, and therefore traffic flow
is temporarily interrupted, and the Telnet connection is lost.

Reset LAN
➤ To reset the LAN interface:
• From the Resets menu, type 2.
You will be prompted to confirm the reset operation.
Note This operation restarts the IR-IP LAN controller.
To continue your Telnet session, press any key within 15 seconds following the
confirmation of the reset operation.

D-22 Device Control Menu

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

Reset WAN
➤ To reset the WAN interface:
• From the Resets menu, type 3.
You will be prompted to confirm the reset operation.
Note Resetting the WAN interface causes the WAN controller to be restarted. This results
in renegotiation of the WAN protocol parameters.
To continue your Telnet session, press any key within 15 seconds following the
confirmation of the reset operation.

D.11 View Menu

The View menu is used to view the IR-IP configuration data, and display
information on its ARP tables, multicast Groups tables and statistics.
➤ To access the View menu:
• From the Main menu, type 5.
The View menu appears (Figure D-19).
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Quick Setup
Management Access
Advanced Setup
Device Control
View
----------------------------------------------------------
1. Configuration and Connection
2. ARP Tables
3. Multicast Groups Table
4. Statistics

Press one of the numbers to select or ESC:

Figure D-19. View Menu

Configuration and Connection

This screen is used to view the configuration parameters of IR-IP. In addition, you
can also view the current status of the LAN and WAN interface.
➤ To access the Configuration and Connection screen:
• From the View menu, type 1.
The View Configuration screen appears (Figure D-20).

View Menu D-23

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

VIEW CONFIGURATION
------------------
BOOT Version :1.06 18.03.1999
Device Name :IP router card
System Location :The location of this device
Contact Person :Name of contact Person

MAC Address : 00-20-D2-16-3F-9B

Default Gateway : WAN

Intrf Type Baud(Kbps) Prot IP Address IP Mask Status

.....................................................................
LAN UTP ------- Ethr 192.168.205.005 255.255.255.000 Connected
WAN V.110 FR Not Conn.

Press any key to continue:

Figure D-20. View Configuration Screen

ARP Tables
This screen is used to display the IR-IP ARP table. This table shows the IP address
assigned to each station on the LAN (the stations are identified by their MAC
addresses).
➤ To access the ARP Tables screen:
• From the View menu, type 2.
The ARP Tables screen appears (Figure D-21).

IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

ARP Table
---------
IP Address MAC Address IP Address MAC Address
192.168.205.003 00-40-33-20-C8-3C

Press any key for exit

Figure D-21. ARP Tables Screen

Multicast Groups Table Screen

This screen is used to display information about the multicast group IP addresses
and their status.
➤ To access the Multicast Groups Table screen:
• In the View menu, type 3.
The Multicast Groups Table screen appears (Figure D-22).

D-24 View Menu

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Multicast Groups Table

----------------------
Group IP Address Status Group IP Address Status
Press any key for exit

Figure D-22. Multicast Groups Table Screen

Statistics Screen
The Statistics screen is used to display statistical information on the traffic between
the networks connected by IR-IP. The data displayed on this screen enables you to
evaluate the IR-IP performance. Two different Statistics screens are used, one for
the LAN side and the other for the WAN side.
➤ To access the Statistics menu:
• In the View menu, type 4.
The LAN and WAN Statistics screens appear (Figure D-23 and Figure D-24).
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

SYSTEM STATISTICS
-----------------
Counter Name Val Counter Name Val
LAN in Octets 83504 LAN IP Header Errors 0
LAN Unicast Frames In 1 LAN IP Address Errors 0
LAN Non-Unicast Frames In 9 LAN Alignment Errors 0
LAN Out Octets 83504 LAN CRC Errors 0
LAN Unicast Frames Out 3560 LAN Single Collisions 0
LAN Non-Unicast Frames Out 0 LAN Multiple Collisions 0
LAN to WAN Frames Passed 1698 LAN Late Collisions 0
LAN IP Datagram Received 2638 LAN Excessive Collisions 0
LAN to CPU Frames Discarded 0 LAN Frames Too Long Errors 0
LAN to WAN Frames Discarded 0 LAN RX FIFO Overrun Error 0
LAN Out Errors 0 LAN SQE Transmitted 0
LAN RX Frames Errors 0 LAN Deferred Frames 1
LAN MAC Receive Errors 0 LAN Carrier Sense Lost 0
LAN MAC TX Errors 0 LAN FIFO Underrun 0

N - Next Screen. ESC - Back To Previous Menu.

R - Refresh Page. C - Clear The Counters Of This Page.

Figure D-23. LAN Statistics Screen

View Menu D-25

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

SYSTEM STATISTICS
-----------------
Counter Name Val Counter Name Val
WAN in Octets 83504 WAN Alignment Errors 0
WAN Out Octets 1950 WAN Aborted Frames 0
WAN Out Frames 1723 WAN Short Frames 0
WAN to LAN Frames Transfer 1698 WAN RX FIFO Overrun Error 0
WAN IP Datagram Received 1723 WAN to CPU Frames Errors 0
WAN to CPU Discarded 0 WAN Frame Too Long Errors 0
WAN to LAN Discarded 0 WAN IP Header Errors 0
WAN Out Errors 0 WAN IP Addres Errors 0
WAN CRC Errors 0

PPP Address Error 0

PPP Control Error 0
DLCI Unrecognized Error 0
Frame Relay Forward Conge 0
Frame Relay Backward Conge 0

P - Previous Screen. ESC - Back To Previous Menu.

R - Refresh Page. C - Clear The Counters Of This Page.

Figure D-24. WAN Statistics Screen

D.12 Diagnostic Tool (Ping Terminal) Menu

This section provides information on the diagnostic tool provided with IR-IP (the
ping utility).
➤ To access the Diagnostic Tools menu:
• In the Main menu, type 6.
The Diagnostic Tools menu appears (Figure D-25).
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Quick Setup
Management Access
Advanced Setup
Device Control
View
Diagnostic Tools (PING terminal)
=====================================================================
1. Ping IP Address :192.168.100.011
2. Start Pinging :>>>
3. Stop Pinging :>>>

Press one of the numbers to select or ESC:

Figure D-25. Diagnostic Tools Menu

D-26 Diagnostic Tool (Ping Terminal) Menu

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

Using the Ping Function

The Ping option is used to confirm IP connectivity by pinging other IP hosts.
Connectivity is confirmed by receiving a reply from the remote (pinged) IP host.
➤ To ping a host:
1. From the Diagnostic Tools menu, type 1 and enter the desired host IP address.
2. Press <Enter> to confirm the destination IP address.
3. To start pinging, type 2 on the Diagnostic Tools screen.
After pinging starts, you can monitor the ping status. A typical screen is
shown in Figure D-26.
Note After pinging is started, it continues in the background even if you exit the
Diagnostics Tools screen. In this case, a Ping Running message appears in the top
upper left-hand corner of the screen.
4. To stop pinging, type 3 from the Diagnostic Tools menu.
A Ping Stopped message is displayed.
To clear the message and return to the Diagnostic Tools screen, press any
key.
IR_IP <IR-IP> S/W Ver. 1.00 31/IR (date)

Quick Setup
Management Access
Advanced Setup
Device Control
View
Diagnostic Tools (PING terminal)
=====================================================================
1. Ping IP Address :192.168.100.011
2. Start Pinging :>>>
3. Stop Pinging :>>>

Pinging 192.168.212.001 Sent 27 Recvd 25 Lost 2 Resp.Time 60 ms

Press one of the numbers to select or ESC:

Figure D-26. Diagnostic Tools Menu after Receiving Pinging Response

Diagnostic Tool (Ping Terminal) Menu D-27

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

D.13 Erasing User’s Configuration

The user-defined configuration parameters are stored in the IP router card flash
memory. After the user-defined configuration parameters are erased, the IP router
card automatically loads the default parameters.
You may want to erase the current configuration parameters:
1. Before IR-IP is prepared for operation in a new application.
2. When you cannot configure IR-IP because its current LAN-interface IP address
and/or the Telnet password, are not known.
➤ To erase the user’s configuration:
1. Turn HTU-2 off.
2. Set all the four sections of the IR-IP DIP switch (Figure D-3) to ON.
3. Turn HTU-2 on and monitor the ERR indicator: it must turn on and light
steadily.
4. While the ERR indicator is lit (within 15 seconds), set sections 1 and 2 of the
DIP switch to OFF.
The IP router configuration is erased.
Note
If you do not set sections 1 and 2 to OFF within 15 seconds of power-up, the IP
router card ignores the setting of all the four sections to ON and starts normal
operation. In this case, it is recommended to turn the HTU-2 off and then back on.
To abort the whole operation, turn HTU-2 off, return all the four-switch section to
the desired positions, and then turn HTU-2 on again.
5. Turn HTU-2 off, and the return all the four sections of the DIP switch to the
desired positions.

D.14 Erasing IR-IP Software

You may erase the IR-IP application software, without erasing the user-defined
parameters.
After the application software is erased, IR-IP starts its TFTP server application, and
waits for the downloading of software by a TFTP client connected to its LAN
interface. The procedure to be used to download the application software in this
case is also described below.
You may want to erase the application software if the downloading of new
software using the Device Control menu (see Figure D-16) fails, and the IP router
card does not function properly.

D-28 Erasing IR-IP Software

HTU-2 Installation and Operation Manual Appendix D IR-IP Interface Module

Erasing Application Software

➤ To erase the application software:
1. Turn HTU-2 off.
2. Set all the four sections of IR-IP DIP switch to ON.
3. Turn the HTU-2 on and monitor the IR-IP ERR indicator: it must turn on and
light steadily.
4. While the ERR indicator is lit (within 15 seconds), set sections 3 and 4 of the
IR-IP DIP switch to OFF.
The IP router application software is erased.
Note
If you do not set sections 3 and 4 to OFF within 15 seconds of power-up, IR-IP
ignores the setting of all the four sections to ON and starts normal operation. In this
case, it is recommended to turn HTU-2 off and then back on.
Alternately, to abort the whole operation, turn HTU-2 off, return all the four
switches to the desired positions, and then turn HTU-2 on again.
5. Turn HTU-2 off, and the return all the four sections of the DIP switch to the
desired positions.
Downloading New Software
After erasing the application software, you can download new software from any
computer that can serve as a TFTP client.
To enable the downloading, IR-IP automatically activates its TFTP server
application with the following factory-default IP parameters:
• IP address: 192.168.205.1
• Subnet mask: 255.255.255.252.
Connect the computer serving as a TFTP client to the IR-IP 10BASE-T connector in
the way as a Telnet host used for preliminary configuration (see the Performing
Preliminary Configuration section). The computer IP parameters must be
configured as follows:
• IP address 192.168.205.2
• Subnet mask 255.255.255.252
• Default gateway 192.168.205.1

➤ To download new software:

1. If necessary, turn HTU-2 off.
2. Set all the four sections of the IR-IP DIP switch to OFF.
3. Turn HTU-2 on and monitor the ERR indicator: it must start flashing.
4. Connect the computer to the IP router LAN interface and configure its IP
parameters as explained above.
5. Run a standard TFTP client application on the Telnet host, and download the
appropriate software file.
ƒ If the download is successful, IR-IP starts using the new software.
ƒ If the downloading fails, repeat the download process.

Erasing IR-IP Software D-29

Appendix D IR-IP Interface Module HTU-2 Installation and Operation Manual

D-30 Erasing IR-IP Software

Appendix E
IR-X21B Interface Module
E.1 General
IR-X21B is an interface module for RAD modems, converting X.21 signals to TTL
levels. The converted data is sent over the modem link, using the modem
modulation technique, and is converted back at the other end into X.21 signals, or
into any other digital interface signal.
Figure E-1 shows a typical application of HTU-2 with IR-X21B interface module.

X.21 HDSL X.21

Router HTU-2 HTU-2 Router

Figure E-1. Typical Application of HTU-2 with IR-X21B Module

Figure E-2 shows the rear panel of HTU-2 equipped with the IR-X21B interface
module. Table E-1 lists the module DB-15 connector pin assignment.

Figure E-2. Rear Panel of HTU-2 with IR-X21B Module

Table E-1. IR-X21B Connector Pin Assignment

Pin Designation Direction Function
1 FG ↔ Frame Ground
2 TA To HTU-2 Transmit Data – wire A
3 CA To HTU-2 Control – wire A
4 RA From HTU-2 Receive Data – wire A
5 IA From HTU-2 Indication Data – wire A
6 SA From HTU-2 Signal Timing – wire A
7 BA To HTU-2 External Timing – wire A
8 G ↔ Signal Ground
9 TB To HTU-2 Transmit Data – wire B
10 CB To HTU-2 Control – wire B
11 RB From HTU-2 Receive Data – wire B

General E-1
Appendix E IR-X21B Interface Module HTU-2 Installation and Operation Manual

Table E-1. IR-X21B Connector Pin Assignment (Cont.)

Pin Designation Direction Function

12 IB From HTU-2 Indication Data – wire B
13 SB From HTU-2 Signal Timing – wire B
14 BB To HTU-2 External Timing – wire B
15 – N/A Not Connected

E.2 Configuring IR-X21B

IR-X21B interface module supports two clock modes:
• EXT (External)
• INT/LBT (Internal/Receive)

You must set the IR-X21B clock to match the timing you have selected for the
HTU-2 modem. The clock settings are made via the JP2 jumper located on the
IR-X21B board, as shown in Figure E-3.

JP2
EXT

Figure E-3. IR-X21B Module Layout

E-2 Configuring IR-X21B

HTU-2 Installation and Operation Manual Appendix E IR-X21B Interface Module

EXT Clock Mode

The EXT clock mode is used in applications of X.21 networks where the system
timing is provided by the X.21 network. The IR-X21B module has an internal
16-bit FIFO buffer to compensate for the phase delay introduced to the system by
the line delay between the two modems. Figure E-4 illustrates the buffer
connection and the flow of the receive, transmit and clock signals.
Note Use the EXT timing only for HTU-2 configured as central.
IR-X.21B
TXD TXD
FIFO (2, 9)
Buffer
TXC Tx

ETC Signal Timing

MODEM DTE
(6, 13)

RXC ETC
FIFO (7, 14)
Buffer
RXD Rx RXD
(4, 11)

Figure E-4. EXT Timing Mode

INT/LBT Clock Mode

The INT/LBT clock mode is used in applications where the IR-X.21B side uses the
clock signal from the modem link. This mode is used mainly when the attached
equipment has an X.21 interface, but no ability to produce clock signals. The
module has a 16-bit FIFO buffer to compensate for the phase delay introduced by
the X.21 device. Figure E-5 illustrates the buffer connection and the flow of the
receive, transmit and clock signals.
IR-X.21B
TXD TXD
FIFO (2, 9)
Buffer
Tx

TXC Signal Timing

MODEM DTE
(6, 13)

RXC
FIFO
Buffer
RXD Rx RXD
(4, 11)

Figure E-5. INT/LBT Timing Mode

Note Only the INT/LBT timing mode is possible for HTU-2 configured as remote.

Configuring IR-X21B E-3

Appendix E IR-X21B Interface Module HTU-2 Installation and Operation Manual

E-4 Configuring IR-X21B

 Appendix F
IR-E1 2048 kbps Unframed
Interface Module
General
IR-E1 is an interface module for HTU-2 that converts G.703 E1 signals to TTL
levels. The converted data is sent over the modem link using the modem's
modulation technique. It is then converted back at the other end into G.703 E1
2048 kbps signals.
The IR-E1 interface module fits into a standalone modem, and is available with
two types of physical connections: RJ-45 for balanced twisted pair connection and
BNC for unbalanced coaxial connection. Figure F-1 illustrates the HTU-2 rear
panel with IR-E1 interface module. Table F-1 lists the RJ-45 connector pinout.

Figure F-1. Rear Panel of HTU-2 with IR-E1 Module

Table F-1. RJ-45 Connector Pinout

Pin Direction Function

1 Input to HTU-2 Receive Data Input (ring)
2 Input to HTU-2 Receive Data Input (ring)
3 ↔ Frame Fround
4 Output from HTU-2 Transmit Data Input (ring)
5 Output from HTU-2 Transmit Data Input (ring)
6 ↔ Frame Fround
7, 8 Not connected

Configuring IR-E1 F-1

Appendix F IR-E1 2048 kbps Unframed Interface Module HTU-2 Installation and Operation Manual

F.1 Configuring IR-E1

Figure F-2 illustrates the IR-E1 interface module layout.
RX CHAS
DIS
JP1

CON

JP2
JP4
BAL UBAL
JP7 JP6 TX CHAS

BAL UBAL DIS CON

EXT INT/RCV JP5 JP3

Figure F-2. IR-E1 Layout

Table F-2. IR-E1 Module Jumper Settings

Jumper Function Possible Settings Factory Setting

JP1 Controls connection between CON – BNC receive shield is
RX CHAS the RX BNC shield and the connected to the chassis
chassis ground ground
DIS – BNC receive shield is DIS
disconnected from the chassis
ground
JP3 Controls connection between CON – BNC transmit shield is
TX CHAS the TX BNC shield and the connected to the chassis
chassis ground ground
DIS – BNC transmit shield is DIS
disconnected from the chassis
ground
JP2, JP4, JP5, Select between the IR-E1 BAL – Balanced 120Ω RJ-45 BAL
JP6 interface type connection
BAL/UBAL
UBAL – Unbalanced 75Ω BNC
connection
JP7 Selects the clock source for INT/RCV – IR-E1 module receives INT/RCV
Clock Mode the IR-E1 module clock from the modem
EXT – IR-E1 module receives clock
from the E1 network
Note: When selecting the IR-E1 clock source, make sure that it matches the timing reference of the HTU-2
modem.

F-2 Configuring IR-E1

HTU-2 Installation and Operation Manual Appendix F IR-E1 2048 kbps Unframed Interface Module

Selecting the Clock Source

The IR-E1 interface module supports two jumper-selectable clock modes:
• INT/RCV – HTU-2 provides the IR-E1 module with the clock for transmitting
and receiving data from the attached E1 equipment (see Figure F-3).
IR-E1
RCV Clock
Digital V.35 HDSL E1
Backbone
2.048 Mbps 2.048 Mbps
HTU-2 HTU-2 PABX
(EXT Clock) (RCV Clock)

Figure F-3. INT/RCV Clock

• EXT – The IR-E1 module recovers the clock from the E1 received signal. The
recovered clock is passed to the modem for transmitting and receiving data
from the remote modem (see Figure F-4).
IR-E1
EXT Clock
E1 E1 HDSL V.35
Backbone
2.048 Mbps 2.048 Mbps
HTU-2 HTU-2 Router
(EXT Clock) (RCV Clock)

Figure F-4. EXT Clock

Configuring IR-E1 F-3

Appendix F IR-E1 2048 kbps Unframed Interface Module HTU-2 Installation and Operation Manual

F-4 Configuring IR-E1

 Appendix G
Parameters and Terminal
Commands
G.1 General
This appendix lists all the HTU-2 front panel configuration parameters and
terminal commands. Some of the HTU-2 parameters can be modified only via the
control port. These parameters are listed and explained in Section G.3, Control
Terminal Commands.
Note Some of the HTU-2 configuration parameters depend on the type of remote unit
being used. Therefore, after the HDSL synchronization is reached, wait for about
1 minute before you start configuring the modem. This allows the proper
recognition of the remote unit and ensures the correct HTU-2 configuration.

G.2 Front Panel Parameters

This section lists the HTU-2 configuration parameters and their functions. The
information is organized in tables for each group of parameters:

Group Display See...

System parameters SYSTEM PARAMETER Table G-1
Channel parameters CHANNEL PRM Table G-2
Control port parameters SP PARAMETERS Table G-3
Priority bumping parameters PB PARAMETERS Table G-4

The tables also list the parameter values included in the HTU-2 default
configuration and important practical configuration guidelines.
* Parameters marked with an asterisk are displayed only when your HTU-2 is
configured as a central unit.

Front Panel Parameters G-1

Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

Table G-1. System Parameters

Designation Function Values Configuration Guidelines

CLK Selects the master EXT Locked to the recovered receive clock of the data port. For connection to a data network, select
MASTER* timing reference. The EXT.
INT Internal oscillator
available selections For a point-to-point application with
depend on the HTU-2 Default: EXT for HTU-2 with serial data interface standalone equipment at both link ends,
function. Refer to INT for HTU-2 with Ethernet interface you can also select INT.
Chapter 1 for details.

Note: When HTU-2 is configured as a remote unit, the CLK MASTER parameter doesn’t appear at all. The clock is always locked to the recovered receive clock
of the HDSL line. This locks the outgoing data port timing to the timing of the HDSL signal. If both lines operate normally, HTU-2 uses the recovered clock
of line A (line 1); if line 1 fails, HTU-2 automatically switches to the recovered clock of line 2.
MASTER Displays HTU-2 CNTR HTU-2 configured as central unit
FUNC configuration mode
REM HTU-2 configured as remote unit
CONFIG Controls the YES Enables the downloading function. The configuration values
REM* downloading function selected for HTU-2 configured as central unit are
downloaded to the unit configured as remote, and
determine the remote unit operating mode.
NO Disables the downloading function.
Default: YES
HRPT Shows whether your YES The HDSL link contains H-RPT.
HDSL link contains an
NO There is no HDSL repeater on the HDSL link.
H-RPT repeater

Note If in your application the downloading function is disabled (CONFIG REM at the central unit set to NO), and the unit configured as
central is reset or restarted (for example, after power-up), its parameters may be automatically downloaded to the unit configured
as remote, and replace the locally-modified parameters. To prevent this, make sure that section 2 (DB INIT) of the internal DIP
switch of the unit configured as central is set to OFF (see “Setting the Internal Jumpers and Switches” in Chapter 2).

G-2 Front Panel Parameters

HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

Table G-2. Data Channel Configuration Parameters

Designation Function Values Configuration Guidelines

FRAME Selects the HDSL framer FRAMED Allocates 32 timeslots of Select UNFRAMED if your remote unit is HTU-E1 and the
mode 64 kbps each desired payload data rate is 2048 kbps.
UNFRAMED Allows transfer of unframed
2048 kbps data streams
Default: FRAMED
Notes: If you select UNFRAMED, the payload must be 1792 kbps or 2048 kbps. Priority bumping is not applicable in this mode.
Any change in the framing mode will cause double temporary HDSL synchronization loss.
MULT Selects the basic data rate 64K Basic data rate is 64 kbps Select the basic rate of the user's payload, 56 kbps or 64 kbps,
per HDSL timeslot in accordance with the desired user's channel data rate.
56K Basic data rate is 56 kbps
The recommended selection is 64 kbps. When you select
Default: 64
56 kbps, HTU-2 packs the user's data in bytes by adding "1" bit
for each seven user bits, therefore actually the line data rate is
always a multiple of 64 kbps.
MAP Selects the timeslot USER Free user selection of timeslots. To assign individual timeslots, select USER.
allocation method used for
SEQ Sequential allocation of timeslots, To let HTU-2 assign the timeslots automatically in accordance
mapping user's data into the
starting from a user-specified slot, with the SPEED parameter, select SEQ (sequential allocation) or
timeslots of the HDSL signal
defined under START TS. ALT (alternate allocation).
ALT Alternate allocation of timeslots, ALT means that starting from a specified slot, defined under
starting from a user-specified timeslot, START TS, the slot allocation looks like this: DATA NC DATA
defined under START TS. NC DATA etc.
Default: USER
SPEED Selects the channel payload Available data rates are multiples of the basic When working in UNFRAMED mode, the data rate must be
data rate. For HTU-2 with rate (56 kbps or 64 kbps). The multiples are in 1792 kbps or 2048 kbps for basic rates 56 kbps or 64 kbps,
Ethernet interface, selects the range of 1 to 32, resulting in rates of 56, respectively.
the transfer rate through the 112, 168, ..., 1792 kbps or 64, 128, 192, ...,
The maximum possible speed selected for the ALT mode
HDSL link 2048 kbps, respectively.
depends on the start parameter and cannot exceed multiple of
Default: 64 kbps MULT and 16.

Front Panel Parameters G-3

Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

Table G-2. Data Channel Configuration Parameters (Cont.)

Designation Function Values Configuration Guidelines

START Selects the starting timeslot for Any number in the range of 0 to 31, consistent When working in UNFRAMED mode, this parameter must be
SEQ or ALT timeslot allocation with the desired number of user timeslots. set to 0.
(not displayed for USER
Default: 0 If you have selected SEQ, make sure that the sum of the START
allocation)
timeslot number and of SPEED divided by MULT does not
exceed 31.
CTS Selects the state of the CTS ON CTS continuously on For polled applications, select =RTS.
line in the user data channel
=RTS CTS line follows the RTS line
interface (not relevant for the
Ethernet interface modules) Default: ON
ETHER Selects the Ethernet LAN HALF_DUP Half duplex operation
traffic transfer mode
FULL_DUP Full duplex operation
(displayed only for versions
of HTU-2 units with Ethernet Default: HALF_DUP
interface)
BRIDGING Reserved for future use Always displays FILTER, independently of the To select the Ethernet traffic control function, use the internal
(displayed only when data selected Ethernet traffic control function DIP switch located on the board of the IR-ETH or IR-ETH/Q
channel has Ethernet interface module, see Appendix B or Appendix C for details.
interface)
TS_0 to If you have selected USER NC Timeslot not used (not For each timeslot to be used, select DATA to assign the
TS_31 under MAP, selects, for each connected) timeslot to carry user's payload, or NC to skip it. Make sure
HDSL timeslot, whether to you assign the exact number of timeslots needed to support
DATA Timeslot used to carry payload
use it for carrying the user's the data rate selected by means of the SPEED parameter.
data
payload or not. If you have
selected SEQ or ALT, displays Default: NC
the timeslot allocation.

G-4 Front Panel Parameters

HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

Table G-3. Control Port Parameters

Designation Function Values Configuration Guidelines

SPEED Selects control port data 300, 1200 ,2400, 4800, 9600 (bps) To enable the supervisory port to use the
rate SLIP protocol (for example, for SNMP or
AUTO Autobaud operation. HTU-2 automatically identifies the
Telnet management), select the specific data
control port data rate.
rate being used. In all the other cases, select
Default: AUTO AUTO.
In this case HTU-2 performs the automatic
baud rate recognition procedure. To ensure
positive identification of terminal data rate,
start the communication by pressing
<Enter> three times.
DATA Selects the number of 7 or 8 data bits. Ensure that the number of data bits is the
data bits in the word same as on the terminal.
Default: 8
format
PARITY Selects the method of ODD Odd parity Ensure that the parity is the same as on the
parity checking terminal.
EVEN Even parity
NO Parity check disabled (available only with 8 data bits)
Default: NONE
INTERFACE Selects control port DCE HTU-2 operates as a DCE for the control terminal. Select DCE when directly connected to the
interface control terminal.
DTE HTU-2 operates as a DTE, for connection via modem to
the control terminal. Select DTE when connected to a modem.
Default: DCE
Note: The INTERFACE parameter changes only the direction of the interface control (handshaking) signals, but not the functions of the interface pins. Therefore,
when connecting to a modem, it is necessary to use a cross cable.
AUX DEV* Selects the management TERMINAL Management by means of a supervision terminal.
mode supported by the
NMS-SLIP Management by means of Telnet host or an SNMP
HTU-2 control port
network management station.
NONE Not in use
Default: TERMINAL

Front Panel Parameters G-5

Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

Table G-4. Priority Bumping Configuration Parameters

Designation Function Values Configuration Guidelines
TS_1 to TS_31 Selects the timeslot priority LOW Low priority
. in the case one of the
HIGH High priority
HDSL lines is down. The
timeslots which have been Default: LOW
assigned high priority will
continue being sent on the
remaining HDSL line
Notes: 1. The priority bumping parameters are not available in the unframed mode.
2. Timeslot 0 always has HIGH priority. The maximum number of other timeslots that can be configured to high priority is 16.

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

G.3 Control Terminal Commands

This section describes the HTU-2 commands in detail. The commands are listed in
alphabetical order. The descriptions include command syntax, use, and options.
Next to each command, in parenthesis, is the command's mnemonic.
The following notational conventions are used in this section:
[] Indicates optional entry/parameter
'' Delimits user entry
<Enter> Signifies the Enter (carriage return) key
LPX Identifies the HDSL line (LP1 for line 1, LP2 for line 2)
X Identifies the HDSL line or data channel number (1 or 2)

CLR ALM

Purpose
Clear the alarm buffer.

Syntax
CLR ALM [/A]

Use
• To clear only ON-type alarms stored in the alarm buffer (see Alarms in
Chapter 5), enter:
CLR ALM<Enter>
Note The CLR ALM command does not remove ON-type alarms from the alarm buffer, it
just turns them off. The ALM LED on the front panel remains lit, and you are able to
see these alarms on the LCD and on the terminal.
• To clear all alarms stored in the alarm buffer (including the history of
ON/OFF-type alarms) and remove them from the alarm buffer, enter:
CLR ALM/A<Enter>
HTU-2 performs the command and displays the date and time, followed
by the HTU-2> prompt. If you used the /A option and no alarm condition
currently exists, the ALM LED goes off.
CLR ALM HRPT

Purpose
Clear the H-RPT alarm buffer.

Syntax
CLR ALM HRPT [/A]

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

Use
• To clear only ON-type alarms stored in the alarm buffer of the H-RPT repeater
(see Alarms in Chapter 5), enter:
CLR ALM HRPT<Enter>
Note CLR ALM HRPT command does not remove ON-type alarms from the alarm buffer,
it just turns them off.
• To clear all the alarms stored in the alarm buffer of the H-RPT repeater
(including the history of ON/OFF-type alarms) and remove them from the
alarm buffer, enter:
CLR ALM HRPT/A<Enter>
HTU-2 performs the command and displays the date and time, followed
by the HTU-2> prompt.
CLR ALM REM

Purpose
Clear the remote unit alarm buffer.

Syntax
CLR ALM REM [/A]

Use
• To clear only ON-type alarms stored in the alarm buffer of the remote unit
(see Alarms in Chapter 5), enter:
CLR ALM REM<Enter>
Note The CLR ALM REM command does not remove ON-type alarms from the alarm
buffer, it just turns them off. The ALM LED on the front panel of the remote unit
remains lit, and you are able to see these alarms on the LCD and on the terminal.
• To clear all alarms stored in the alarm buffer of the remote unit (including the
history of ON/OFF-type alarms) and remove them from the alarm buffer,
enter:
CLR ALM REM/A<Enter>
HTU-2 performs the command and displays the date and time, followed
by the HTU-2> prompt. If you used the /A option and no alarm condition
currently exists in the remote unit, its ALM LED goes off.
CLR LOOP

Purpose
Deactivate the specified user-initiated loopback or test.

Syntax
CLR LOOP [loop type], or CLR LP [loop type]

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

Use
• To deactivate a local (L) loopback on the HDSL lines, enter:
CLR LOOP L LINE<Enter> or CLR LP L LINE<Enter>*
• To deactivate a local (L) loopback on the data channel of the local HTU-2,
enter:
CLR LOOP L CH<Enter> or CLR LP L CH<Enter>
• To deactivate the remote (R) loopback on the data channel of the local
HTU-2, enter:
CLR LOOP R CH<Enter> or CLR LP R CH<Enter>
• To deactivate a remote (R) loopback on the data channel of the remote
HTU-2, enter:
CLR LOOP R R CH<Enter> or CLR LP R R CH<Enter>*
• To deactivate a local loopback on the H-RPT, enter:

CLR LOOP L HRPT<Enter> or CLR LP L HRPT<Enter>

The commands marked with an asterisk (*) apply only when HTU-2 is
configured as central.
HTU-2 performs the command and displays the date and time, followed
by the HTU-2> prompt. If there are no more tests activated, the TST LED
goes off.
Note If no test or loopback of this type is currently activate, HTU-2 displays ERROR 02 on
the terminal.

CLR TST

Purpose
Deactivate all user-initiated tests and loopbacks being activated from this unit.
Syntax
CLR TST

Use
• To deactivate all user-initiated tests and loopbacks, enter:
CLR TST<Enter>
HTU-2 performs the command and displays the date and time, followed
by the HTU-2> prompt. The TST LED goes off.
Note If no test or loopback is currently activated, HTU-2 displays ERROR 02 on the
terminal.

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

DATE

Purpose
Set the date for the HTU-2 internal real-time clock.
Syntax
DATE
Use
1. Enter:
DATE<Enter>
HTU-2 sends the entry line for the first parameter:
DAY = 05

2. If you do not want to change the current value of the parameter, press
<Enter> to confirm it and continue to the next line, otherwise press <F> to
increase or <B> to decrease the displayed values, and then press <Enter> to
confirm the selected value.
HTU-2 displays the entry line for the next parameter.
3. Repeat the procedure in step 2 to set the month.
HTU-2 displays the entry line for the year.
4. Enter the four digits of the current year.
HTU-2 displays the entry line for the day of the week.
5. Repeat the procedure in step 2 to set the day of the week, then press
<Enter> to confirm the new date.

HTU-2 displays the new date and time, followed by the HTU-2> prompt.
A typical display, as seen after all the parameters are selected, is shown below:
DAY = 05
MONTH = 02
YEAR [4 CHARS] = 2001
WEEK DAY = MON

DEF AGENT

Purpose
Display and modify the current SNMP agent parameters.
To enable SNMP and Telnet management, it is necessary to define all the SNMP
agent parameters.

Syntax
DEF AGENT

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

Use
1. To define the SNMP agent parameters, enter:
DEF AGENT<Enter>
HTU-2 displays the entry line for the first parameter:
TELNET_APATHY_TIME
10 MIN

2. Press <Enter> to accept the current parameter value and continue to the next
line. Press <F> to increase or <B> to decrease the displayed value, then
press <Enter> to confirm the new value.
HTU-2 displays the entry line for the next parameter.
3. Enter the required values one by one, referring to Table G-5, then press
<Enter> to execute the command. A typical display, as seen after all the
parameters are selected, is shown below.
TELNET_APATHY_TIME = 10 MIN
IP ADDRESS IS: = 192.114.029.233
READ COMMUNITY IS: = public
WRITE COMMUNITY IS: = private
TRAP COMMUNITY IS: = public

HTU-2 displays the date and time, followed by the HTU-2> prompt.
Display Fields
Table G-5 lists the agent parameters, along with their range of values and
instructions on how to modify them.

Table G-5. SNMP Agent Parameters

Parameter Name Configuration Instructions

TELNET_APATHY_TIME Press <F> or <B> to set the time, in minutes, after which
a Telnet connection will be automatically terminated if no
incoming activity is detected.
Available values are 10MIN, 15MIN, and 20MIN.
Default: 10MIN.
DEFAULT GATEWAY Enter the IP address to which the agent will send
information if no other address is defined in the routing
table.
READ COMMUNITY Enter the name of the SNMP community that has
read-only authorization (the HTU-2 SNMP agent will
accept getRequest and getNextRequest commands only
from management stations using that community). You can
enter up to 32 alphanumeric characters.

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

Table G-5. SNMP Agent Parameters (Cont.)

Parameter Name Configuration Instructions
WRITE COMMUNITY Enter the name of the SNMP community that has
read-write authorization (the HTU-2 SNMP agent will also
accept setRequest commands from management stations
using that community). You can enter up to 32
alphanumeric characters.
TRAP COMMUNITY Enter the name of the SNMP community to which the
HTU-2 SNMP agent will send traps. You can enter up to
32 alphanumeric characters.

DEF CALL
Purpose
Define the call-out parameters for the HTU-2 control port when it is used as a dial-
out port. The call-out function is enabled by means of the DEF SP command.
The specified call-out parameters are used by HTU-2 to build the call command
that is sent to the dial-out modem. The dial-out modem connected to the
CONTROL DCE connector via a cross-cable (see Appendix B) must be set up as
follows (for convenience, the Hayes commands required to select the specified
parameters are listed in brackets):
• Auto-answer mode (AT S0=1)
• Call set up in response to the CONNECT string (AT X0)
• No echo (AT E0)
• Verbose mode (no codes, e.g., CONNECT string instead of 0) (AT V1).

Syntax
DEF CALL

Use
1. To define the call-out parameters, enter the following:
DEF CALL<Enter>
HTU-2 displays the first line of the call-out parameters data form.
A typical form is shown below.
NUM_OF_RETRIES WAIT_FOR_CONNECT DIAL_MODE ALT_NUM_MODE
0 30 SEC TONE NO

2. Press <Space> to move between fields of the current line. Press <F> to
increase or <B> to decrease the displayed value. Press <Enter> after all
desired fields have been changed to confirm the new values.

HTU-2 displays the second line of the call-out parameters data form.
A typical form is shown below:
NEW PRIMARY NUMBER [MAX 20 CHARS] =
CURRENT PRIMARY NUMBER = ‘primary number’

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

The second page is used to enter a new primary directory number, and the
second row displays the current primary directory number. The directory
number can include up to 20 digits, including the * and # symbols.
3. After entering the desired directory number, press <Enter>:
ƒ If the ALT_NUM_MODE parameter is NO (no alternate number), HTU-2
displays the date and time, followed by the HTU-2> prompt.
ƒ If the ALT_NUM_MODE parameter is YES, press <Enter> again to display
the third page of the call-out parameters data form, used to enter a new
alternate directory number. A typical form is shown below.
NEW ALTERNATE NUMBER [MAX 20 CHARS] =
CURRENT ALTERNATE NUMBER = ‘alternate number’

4. When you are finished, press <Enter> to execute the new parameters.
HTU-2 displays the date and time, followed by the HTU-2> prompt.
The call-out parameters displayed on the first page of the data form, and their
range of values, are as follows:

Table G-6. Call-Out Parameters

Parameter Name Values Configuration Instructions

NUM_OF_RETRIES 0 – No redialing attempts are This parameter is used to control the number
made if the call is not of dialing retries. If the call cannot be
established on the first established within the specified number of
attempt. redialing attempts on neither of the two
directory numbers, HTU-2 stops the call
1–8 – If the call is not
attempts. When a new alarm report must be
established on the first
sent, the call attempts are started again. The
attempt, HTU-2 will
user is notified that the call attempts failed by
redial the specified
a message recorded in the alarm buffer
number of times.
(separate messages are provided for each
directory number).
The NUM_OF_RETRIES parameter applies to
both the primary and the alternate numbers.
If the call is not established after dialing the
primary directory number the specified
number of times, HTU-2 attempts to establish
the call by dialing the alternate directory
number (provided the use of an alternate
number is enabled by means of the
ALT_NUM_MODE parameter).
WAIT_FOR_CONNECT 30, 45, or 60 seconds This parameter specifies the time HTU-2 will
wait for an answer after each dialing attempt.
If the called station does not answer within
the specified time, HTU-2 disconnects. If
additional call attempts are allowed, the
HTU-2 will redial immediately after
disconnecting.

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

Table G-6. Call-Out Parameters (Cont.)

Parameter Name Values Configuration Instructions

DIAL_MODE TONE – The modem is This parameter is used to select the dialing
instructed to use DTMF mode. The appropriate dialing mode
dialing. depends on the dialing mode supported by
the telephone network.
PULSE – The modem is
instructed to use pulse
dialing.
ALT_NUM_MODE NO – No alternate number This parameter is used to control the use of
an alternate number. The alternate number is
YES – The use of an alternate
dialed used after the specified number of call
number is enabled.
attempts on the primary number failed.
If this parameter is set to NO, HTU-2 stops
the call attempts after the specified number of
call attempts on the primary number failed.

DEF CH

Purpose
Define the data channel parameters.

Syntax
DEF CH

Use
1. To define the channel parameters, enter:
DEF CH <Enter>
HTU-2 displays the first line of the data channel parameters form. A typical
form is shown below:

FRAME MULTIPLIER MAP_TYPE SPEED START_TS CTS ETHERNET_MODE

FRAMED 64K USER 64kbps N/A ON N/A

2. Press <Enter> to accept the current parameter value and continue to the next
line. Press <F> to increase or <B> to decrease the displayed value.
HTU-2 displays the second line of the data channel parameters.

BRIDGING
N/A

3. Change the desired parameters (if needed) and press<Enter>.

HTU-2 displays the first line of the timeslot map of the channel currently
being configured. A typical display is shown below:

TS_O TS_1 TS_2 ... TS_9

NC DATA NC ... NC

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

If you have selected USER under MAP_TYPE, you will have to assign each
timeslot manually.
4. Use the spacebar to move between timeslots. For each timeslot, select
between DATA (timeslot allocated to the channel) and NC (not connected) by
pressing <F> or <B>.
5. After completing the first line, press <Enter> to move to the next line. Repeat
the procedure until all the timeslots are defined. When done, press <Enter>
to finish.
HTU-2 displays the date and time, followed by the HTU-2> prompt.
Table G-7 lists the available data channel configuration parameters and their
functions.
Table G-7. Data Channel Parameters
Designation Function Values
FRAME Selects the HDSL framer mode FRAMED Allocates 32 timeslots of 64 kbps each
UNFRAMED Allows transfer of unframed 2048 kbps
data streams (for example if the remote
unit is HTU-E1)

Default: FRAMED
Note: Any change of the FRAME parameter will cause double temporary HDSL synchronization loss.
MULTIPLIER Selects the basic data rate per HDSL 64K Basic data rate is 64 kbps
timeslot. 56K Basic data rate is 56 kbps

Default: 64
MAP_TYPE Selects the timeslot allocation USER Free user selection of timeslots
method used for mapping user's
SEQ Sequential allocation of timeslots, starting from
data into the timeslots of the HDSL
a user-specified slot (defined under START_TS).
signal.
ALT Alternate allocation of timeslots. This selection
means that starting from a specified slot, the slot
allocation, defined under START_TS, looks like
this: DATA NC DATA NC DATA, etc.

Default: USER
SPEED Selects the channel payload data Available data rates are multiples of the basic rate
rate. (56 kbps or 64 kbps). The multiples are in the range of 1
to 32, resulting in rates of 56, 112, ..., 1736 kbps or 64,
128, 192, ..., 1984 kbps, respectively. When working in
UNFRAMED mode, the data rate must be 1792 or
2048 kbps for basic rates 56 kbps or 64 kbps,
respectively.

Default: 64
START_TS Selects the starting timeslot for SEQ Any number in the range of 1 to 31, consistent with the
or ALT timeslot allocation. desired number of user timeslots.

Default: N/A

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

Table G-7. Data Channel Parameters (Cont.)

Designation Function Values

CTS Selects the state of the CTS line in ON CTS continuously on
the user data channel.
=RTS CTS line follows the RTS line
For a channel with Ethernet
interface, this field always shows N/A Not applicable
N/A, and cannot be changed.
Default: ON
ETHERNET Selects the Ethernet LAN traffic HALF_DUP Half duplex operation
MODE transfer mode.
FULL_DUP Full duplex operation
For a channel with serial data
interface, this field always shows N/A Not applicable
N/A, and cannot be changed
Default: HALF_DUP
BRIDGING Reserved for future use Always displays FILTER, independently of the selected
(displayed only when data channel Ethernet traffic control function.
has Ethernet interface)
Note: To select the Ethernet traffic control function, use the internal DIP switch located on the board of the
IR-ETH or IR-ETH/Q interface module, see Appendix B or Appendix C for details.

Note
• When working in UNFRAMED mode, the START_TS parameter must be set to 0.
• If you have selected SEQ mode, make sure that the sum of the START timeslot
number and of the SPEED parameter divided by MULT does not exceed 31.
• If you have selected ALT mode, make sure that SPEED divided by MULT
multiplied by two plus START_TS number less than or equal to 31,
(SPEED/MULT) × 2 + START_TS ≤ 31).

DEF NAME
Purpose
Define the logical name (up to eight alphanumeric characters).

Syntax
DEF NAME

Use
1. To define the HTU-2 logical name, enter:
DEF NAME<Enter>
HTU-2 displays the logical name entry form:

ENTER NODE NAME (MAX 8 CHARACTERS) =

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

2. Enter the desired name, then press <Enter>.

HTU-2 displays the following line, where 'name' is HTU-2 current logical
name:

CURRENT NAME = 'name'

HTU-2 displays the date and time, followed by the HTU-2> prompt.
Note If you want to store a logical name in the database, make sure that section 2 (DB
INIT) of the HTU-2 internal DIP switch is set to OFF. Otherwise, the default name
(blank) is enforced.

DEF NODE
Purpose
Define the node number, or address, of HTU-2. The allowed range is 0 to 255.

Syntax
DEF NODE

Use
1. Enter:
DEF NODE<Enter>
HTU-2 displays the node entry form:

NODE (0 to 255) = 0

2. Enter the desired number in the range of 0 to 255, then press <Enter>.
HTU-2 executes the command and displays the date and time, followed
by the HTU-2> prompt.
Note If you want to store the user-selected node number, make sure that section 2 (DB
INIT) of the HTU-2 internal DIP switch is set to OFF. To use the user-selected node
number, set section 4 (PASSWD) of the DIP switch to OFF. Otherwise, the default
number (0) is enforced.

DEF PB

Purpose
Define each timeslot priority (high or low). In case one of the HDSL lines is down,
timeslots with high priority will still continue to be sent on the remaining line.

Syntax
DEF PB

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

Use
1. Enter:
DEF PB<Enter>
HTU-2 displays the first line of the timeslot map of the priority bumping. A
typical display is shown below:

TS_1 TS_2 ... ... TS_20

LOW LOW ... ... LOW

2. If you want to change the priorities, use the spacebar to move between
timeslots. For each desired timeslot, select between HIGH and LOW by
pressing <F> or <B>.
3. After completing the first line, press <Enter> to move to the next line. Repeat
the procedure until all the desired timeslots are defined. When done, press
<Enter> to finish.
HTU-2 displays the date and time followed by the HTU-2> prompt.
Notes • The priority bumping parameters are not available in the unframed mode.
• Timeslot 0 always has HIGH priority. The maximum number of other timeslots
that can be configured to high priority is 16.

DEF PWD

Purpose
Define a new user password for the HTU-2 system. The password must have 4 to
8 characters.

Syntax
DEF PWD

Use
1. Type
DEF PWD<Enter>
The following password entry screen appears:

NEW PASSWORD (4 to 8 CHARS) =

2. Enter the new password. Carefully check that the specified password has been
entered, then press <Enter>.

HTU-2 displays the next line:

CURRENT PASSWORD = 'password'

where 'password' is the current password.

HTU-2 then displays the date and time, followed by the HTU-2> prompt.

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

If you want to store the user-selected password, make sure that section 2 (DB INIT)
Note
of the HTU-2 internal DIP switch is set to OFF. To use the user-selected password,
set section 4 (PASSWD) of the S1 DIP switch to OFF. Otherwise, the default
password (HTU) is enforced.

DEF SP

Purpose
Define the control port parameters. Refer to Table G-3 for a description of the
control port parameters and practical guidelines for their selection.

Syntax
DEF SP

Use
1. Enter:
DEF SP<Enter>
The first page of the control port parameters data form is displayed. A typical
form is shown below. The form presents the current parameter values as
defaults.

SPEED DATA PARITY INTERFACE CTS DCD_DEL DSR

AUTO 8 NO DCE =RTS 0_MSEC ON

2. To change the parameter values, press <Space> to move between the fields,
and press <F> or <B> to scroll among the available selections.
3. When done, press <Enter> to display the next page of control port
parameters. A typical form is shown below.
POP_ALM PWD LOG_OFF AUXILIARY DEVICE CALL_OUT_MODE
NO NO NO TERMINAL NONE

4. Repeat the procedure in step 2 to select new parameter values. When done,
press <Enter>.
HTU-2 displays the date and time, followed by the HTU-2> prompt.

Parameters Programmable from the Terminal

In addition to the control port parameters listed in Table G-3, the following
parameters can be programmed only from the terminal.

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

Table G-8. Additional Control Port Parameters

Designation Function Values

POP_ALM Controls the automatic YES The terminal automatically displays the alarm status
display of alarms on the whenever an ON-type alarm appears or an ON/OFF-
terminal type alarm changes its state to ON (see Alarms in
Chapter 5). If no such event occurs, HTU-2 displays
the alarm status every 10 minutes.
NO The automatic display feature is disabled.
PWD Sets password protection YES Password protection is enabled.
NO Password protection is disabled.
CTS Determines CTS state ON The CTS line is always ON (active)
=RTS The CTS line follows the RTS line
DCD_DEL With the HTU-2 control 0, 10, 50, 100, 200, 300 msec.
port defined as DTE,
indicates the delay (in
msec) between DCD=ON
and the sending of data.
DSR Determines the DSR state ON The DSR line is continuously ON. It will switch to
OFF for five seconds after the DTR line is switched
OFF.
DTR The DSR line tracks the DTR line. When
INTERFACE=DTE, the DSR line will switch to ON
for five seconds when the RI line is ON while the
DTR line is OFF.
LOG_OFF Sets idle disconnect time NO Automatic session disconnection disabled
10_MIN Automatic disconnection after ten minutes if
HTU-2 receives no input
CALL_OUT_ Controls the use of the ALL HTU-2 initiates a call after each new alarm
MODE call-out function MAJOR HTU-2 initiates a call only when a new major
alarm appears (refer to Chapter 5).
NONE Call-out function is disabled

Note • In order for HTU-2 to use the selected parameters, verify that DEF SP and DB
INIT sections of the S1 DIP switch (see Chapter 2) is in the OFF state.
Otherwise, HTU-2 will use the default parameters.
• The communication parameters of the dial-out port are the same as those of
the supervisory port.
• In order for the dial-out options to be used properly, verify if the following
conditions are fulfilled:
ƒ The call-out mode is enabled (set to ALL or MAJOR)
ƒ The DEF CALL command is configured
ƒ The CTS field of the DEF SP command is set to ON
ƒ A cross-cable (see Appendix A for pinout) is used to connect the
RS-232/V.24 control port connector of HTU-2 to the dial-out modem.

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

DEF SYS

Purpose
Assign values to system parameters.

Syntax
DEF SYS

Use
1. Enter:
DEF SYS<Enter>
HTU-2 displays the system parameters data form, which presents the
current parameter values as defaults. A typical form is shown below.

CLK_MASTER CONFIG_REM
INT YES

For a description of the CLK_MASTER, and CONFIG_REM parameters, refer to

Table G-1.
2. To change the parameter values, press <Space> to move between the fields,
and press <F> or <B> to scroll among the available selections.
3. After you select the desired parameter values, press <Enter> to execute the
new parameters.
HTU-2 displays the date and time, followed by the HTU-2> prompt.

DEF TERM

Purpose
Define the control sequences to be sent to the supervision terminal to perform the
following terminal control functions:
• Clear the screen
• Move the cursor to the screen home position
• Move the cursor to the right by one position.

This command is similar to the F command (see below), except that it also enables
you to specify a terminal type so that HTU-2 will automatically configure itself for
using the corresponding control sequences. The terminal types supported by this
command are: VT-52, VT-100, TV-920, FREEDOM-100, FREEDOM-220, and
terminals compatible with one of them.

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

The codes used by the supported terminals are listed in Table G-9:

Table G-9. Control Terminal Codes

Function Terminal Type

TV920 VT52 VT100 Freedom100 Freedom220
Clear Screen 1B2A0000 N/A 1B5B324A 1B2A0000 1B5B324A
Cursor Home 1E000000 1B480000 1B5B4800 1E000000 1B5B4800
Cursor Right 0C000000 1B430000 1B5B3143 0C000000 1B5B0143

Syntax
DEF TERM ‘terminal’

Use
• To configure HTU-2 for using the control sequences corresponding to a
supported terminal, enter:
DEF TERM 'terminal'<Enter>
where 'terminal' stands for one of the types listed in Table G-9.
HTU-2 performs the command and displays the date and the time
followed by the HTU-2> prompt.
Note If you enter DEF TERM (without the terminal type), HTU-2 will reset all three codes
to 0.

DSP ALM

Purpose
Display the contents of the local unit alarm buffer. This buffer can contain up to
100 alarm messages.

Syntax
DSP ALM[Option]

Use
• To display the complete buffer contents, enter:
DSP ALM<Enter>
• *To display the complete buffer contents and then clear* the ON-type alarms,
enter:
DSP ALM/C<Enter>
• To display the complete buffer contents and then remove all the stored alarm
messages, enter:
DSP ALM/CA<Enter>
*For an explanation of a clear action, refer to the CLR ALM command above.

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Display Format
The contents of the alarm buffer are displayed as a table with four columns: the
alarm number and alarm message syntax (description), alarm state, and date and
time of alarm occurrence. Each block of alarm message received from HTU-2 is
preceded by a header. The header lists the assigned logical name and the node
number of the HTU-2 unit, which sent the alarm block, thus serving as an
easily-identified separator between alarm messages transmitted by different HTU-2
units.
In the end, HTU-2 displays the date and time, followed by the HTU-2> prompt.
Refer to Alarms in Chapter 5 for a list of all HTU-2 alarm messages in alphabetical
order and corrective actions that you can undertake to fix the problem.
DSP ALM HRPT

Purpose
Display the contents of the alarm buffer of the H-RPT repeater located on the
HDSL link. This buffer can contain up to 100 alarm messages.

Syntax
DSP ALM HRPT[Option]

Use
• To display the complete contents of the H-RPT buffer, enter:
DSP ALM HRPT<Enter>
• To display the complete H-RPT buffer contents and then clear* the ON-type
alarm messages, enter:
DSP ALM HRPT/C<Enter>
• To display the complete H-RPT buffer contents and then remove all the stored
alarm messages, enter:
DSP ALM HRPT/CA<Enter>
* For an explanation of a clear action, refer to the CLR ALM command above.
Refer to Alarms in Chapter 5 for a list of all HTU-2 alarm messages in alphabetical
order and corrective actions that you can undertake to fix the problem.

Display Format
The format of the H-RPT alarm buffer display is similar to the format for the local
alarm buffer, described in the DSP ALM command above.
In the end, HTU-2 displays the date and time, followed by the HTU-2>
prompt.

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

DSP ALM REM

Purpose
Display the contents of the alarm buffer of the appliance located at the remote
end of the HDSL link. This buffer can contain up to 100 alarms.

Syntax
DSP ALM REM[Option]

Use
• To display the complete contents of the remote buffer, enter:
DSP ALM REM<Enter>
• To display the complete contents of the remote buffer and then clear* the
ON-type alarms, enter:
DSP ALM REM/C<Enter>
• To display the complete contents of the remote buffer and then remove all the
stored alarms, enter:
DSP ALM REM/CA<Enter>
* For an explanation of a clear action, refer to the CLR ALM command below.
Refer to Alarms in Chapter 5 for a list of all HTU-2 alarm messages in alphabetical
order and corrective actions that you can undertake to fix the problem.

Display Format
The format of the remote alarm buffer display is similar to the format for the local
alarm buffer, described in the DSP ALM command above.
DSP HDR TST

Purpose
Display the results of the last hardware test of the local HTU-2. The results show
the status detected during the power-on self-test, and any faults detected during
regular operation.

Syntax
DSP HDR TST

Use
• To display the local unit hardware test report, enter:
DSP HDR TST<Enter>

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

Display Format
The display shows NO HARDWARE FAILURE if the test is successful. Otherwise,
HTU-2 displays one of the following messages:
• EPROM FAILURE
• I/O EXP. FAILURE
• HDSL FRAMER FAILURE
• TRANSCEIVER FAILURE
After the message HTU-2 displays the date and time, followed by the
HTU-2> prompt.

DSP HDSL PM

Purpose
Display the contents of performance monitoring registers of a selected HDSL line
of the local HTU-2 For an explanation of the HDSL performance monitoring
registers, refer to Performance Diagnostics Data in Chapter 5.

Syntax
DSP HDSL PM [LPX] [Option]

Use
1. To display the performance monitoring registers of the local unit, act as
follows:
ƒ To display the performance monitoring registers of HDSL line 1, type:
DSP HDSL PM LP1<Enter> or DSP HDSL PM<Enter>
ƒ To display the performance monitoring registers of HDSL line 2, type:
DSP HDSL PM LP2<Enter>
ƒ To display current values of the performance monitoring registers of the
HDSL line 1, and then clear all these registers and restart the count
intervals, type:
DSP HDSL PM LP1/CA<Enter> or DSP HDSL PM<Enter>/CA
ƒ To display current values of the local performance monitoring registers of
the HDSL line 2, and then clear all these registers and restart the count
intervals, type:
DSP HDSL PM LP2/CA<Enter>

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

A typical display is shown below:

PM HDSL LINE - 1

CURRENT ES = 0
CURRENT UAS = 0
CURRENT SES = 0
CURRENT BBE = 0
CURRENT TIMER = 388

For the description and allowed range of the parameters, refer to Performance
Diagnostics Data, in Chapter 5.
2. Press any key to view the next screen, which displays the following:
Note HTU-2 displays this screen only if HTU-2 has been working over 15 minutes after
power-up.

INTERVAL 01 ES = 000 UAS = 000 SES = 000 BBE = 000

ESR = 00.00% SESR = 00.00% BBER = 00.00%
INTERVAL 02 ES = 000 UAS = 000 SES = 000 BBE = 000
ESR = 00.00% SESR = 00.00% BBER = 00.00%
INTERVAL 03 ES = 000 UAS = 000 SES = 000 BBE = 000
ESR = 00.00% SESR = 00.00% BBER = 00.00%
INTERVAL 04 ES = 000 UAS = 025 SES = 026 BBE = 001
ESR = 00.00% SESR = 02.88% BBER = 00.11%
24 HOUR ES = 0
24 HOUR UAS = 25
24 HOUR SES = 26
24 HOUR BBE = 1
24 INTERVAL = 04

DSP PB

Purpose
Display the priority bumping of timeslots selected by the user.

Syntax
DSP PB
Use
• To display the priority bumping of timeslots, type:
DSP PB<Enter>

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

A typical display is shown below:

TIME SLOT MAPPING OF PRIORITY BUMPING
TS: 0 1 2 3 4 5 6 7 8 9
PRIORITY: HIGH LOW LOW LOW LOW LOW LOW LOW LOW LOW

TS: 10 11 12 13 14 15 16 17 18 19
PRIORITY: LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW

TS: 20 21 22 23 24 25 26 27 28 29
PRIORITY: LOW LOW LOW LOW LOW LOW LOW LOW LOW LOW

TS: 30 31
PRIORITY: LOW LOW

Note This command would show correct information only when one of the lines is down.

DSP R HDR TST

Purpose
Display the results of the last hardware test performed by the unit located at the
remote end of the HDSL link (during power-on self-test or regular operation).

Syntax
DSP R HDR TST

Use
• To display the hardware test report, enter:
DSP R HDR TST<Enter>

Display Format
The display shows NO HARDWARE FAILURE if the test is successful, or displays
the appropriate message from the following list:
• EPROM FAILURE
• I/O EXP. FAILURE
• HDSL FRAMER FAILURE
• TRANSCEIVER FAILURE
After the message, HTU-2 displays the date and time, followed by the
HTU-2> prompt.

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

DSP R HDSL PM

Purpose
Display the contents of the performance monitoring registers of the appliance
located at the remote end of the HDSL link.
For an explanation of the HDSL performance monitoring registers, refer to
Performance Diagnostics Data in Chapter 5.

Syntax
DSP R HDSL PM [LPX] [Option]

Use
• To display the performance monitoring registers of HDSL line 1 of the remote
unit, type:
DSP R HDSL PM LP1<Enter> or DSP R HDSL PM<Enter>
• To display the performance monitoring registers of HDSL line 2 of the remote
unit, type:
DSP R HDSL PM LP2<Enter>
• To display current values of the performance monitoring registers of the HDSL
line 1, and then clear all these registers and restart the count intervals, type:
DSP R HDSL PM LP1/CA<Enter> or DSP R HDSL PM/CA <Enter>
• To display current values of the performance monitoring registers of the HDSL
line 2, and then clear all these registers and restart the count intervals, type:
DSP R HDSL PM LP2/CA<Enter>
The format of the display is similar to the format for the performance monitoring
registers of the local unit, described under the DSP HDSL PM command above.
DSP ST CH
Displays status information on the data channel.

Syntax
DSP ST CH[Option]

Use
• To display the current status information for the data channel, type:
DSP ST CH<Enter>
HTU-2 performs the command and displays the date and time followed by
the HTU-2> prompt.
• To monitor continuously data channel status information, type:
DSP ST CH/R<Enter>
The display will be automatically updated. To stop the monitoring, press
<CTRL>+<C>.

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

Display Format
A typical channel status display is shown below.

STATUS OF CH

TYPE = V.35
LOOPS = REM CH REM REM CH LOCAL CH

Table G-10. Data Channel Status Information Fields

Field Displays Options

TYPE The type of the data
channel interface
LOCAL CH The state of the local NO – Local loopback is not activated
loopback on the data
YES – Local loopback is activated
channel
REM CH The state of the remote NO – Remote loopback is not activated
loopback on the data
YES – Remote loopback is activated
channel of the local
HTU-2
REM REM CH The state of the remote NO – Remote remote loopback is not activated
loopback on the data
YES – Remote remote loopback is activated
channel of the remote
HTU-2

DSP ST LINE

Purpose
Display status information on the HDSL lines.

Syntax
DSP ST LINE [Option]

Use
• To display the current status information for HDSL line 1, type:

DSP ST LINE 1<Enter> or DSP ST LINE<Enter>

HTU-2 performs the command and displays the date and time followed by
the HTU-2> prompt.
• To monitor continuously line 1 status information, type:

DSP ST LINE 1/R<Enter> or DSP ST LINE/R<Enter>

The display will be automatically updated. To stop the monitoring, press
<CTRL>+<C>.

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

• To display the current status information for HDSL line 2, type:

DSP ST LINE 2<Enter>
HTU-2 performs the command and displays the date and time followed by
the HTU-2> prompt.
• To monitor continuously line 1 status information, type:
DSP ST LINE 2/R<Enter>
The display will be automatically updated. To stop the monitoring, press
<CTRL>+<C>.
Display Format
A typical HDSL line status display is shown below.

STATUS OF LINE - 1
LINE LOOP = LOCAL
=====
NO
LINE ALARMS = SYNC LOSS SIGNAL LOSS
========= ===========
OFF OFF
HRPT LOOP = NO

The fields in the status information display are listed in Table G-11:

Table G-11. HDSL Line Status Information Fields

Field Displays Options

LINE LOOP The state of the local NO – Local line loopback is not activated
line loopback on the
YES – Local line loopback is activated
HDSL line
LINE ALARMS The state of the line SYNC LOSS ON – Loss of synchronization on the HDSL line.
alarms on the HDSL line
SYNC LOSS OFF – Normal operation.
SIGNAL LOSS ON – Loss of input signal on the HDSL line.
SIGNAL LOSS OFF – Normal operation.
HRPT LOOP The state of the local NO – H-RPT loopback is not activated
H-RPT loopback on the
YES – H-RPT loopback is activated
HDSL line

DSP ST SYS
Purpose
Display system status information.
Syntax
DSP ST SYS

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

Use
• To view the current system status, enter:
DSP ST SYS<Enter>
HTU-2 performs the command and displays the date and the time
followed by the HTU-2> prompt.

Display Format
A typical status information display is shown below.
NODE = 0
NAME = 'HTU-2 name'
NODAL CLOCK = INT
HTU TYPE = CENTRAL
REMOTE HTU TYPE = UNKNOWN HTU
SOFTWARE VER = 02.02
HARDWARE VER = 01.00
HRPT = NTU_SIDE
HRPT SOFTWARE VER = 1.0
HRPT HARDWARE VER = 1.0

The system status fields are described in Table G-12.

Table G-12. System Status Information Fields

Field Description
NODE The node number of HTU-2
NAME The logical name of HTU-2 (if you have defined it with the DEF NAME
command)
NODAL CLOCK • For a unit configured as central, indicates the current source for the
HTU-2 system clock: INT or EXT.
• For a unit configured as remote, always shows LBT.
HTU TYPE Function of HTU-2: CENTRAL or REMOTE
REMOTE HTU TYPE Type of the unit at the remote end of the HDSL link
SOFTWARE VER HTU-2 software version
HARDWARE VER HTU-2 hardware version
HRPT Indicates whether there is an H-RPT repeater on the HDSL link, and
the side of H-RPT to which your HTU-2 is connected.
• DOESN’T EXIST – There is no H-RPT on the HDSL link.
• NTU_SIDE – Your HTU-2 is configured as central
• LTU_SIDE – Your HTU-2 is configured as remote
HRPT SOFTWARE VER H-RPT software version
HRPT HARDWARE VER H-RPT hardware version

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

DSP TS
Display information on the use and type of the main link timeslots.

Syntax
DSP TS

Use
• To display the timeslot mapping information, enter:
DSP TS<Enter>
A typical display for is shown below:
TIME SLOT MAPPING OF MAIN LINES
TS: 0 1 2 3 4 5 6 7 8 9
TYPE: DATA NC DATA DATA DATA NC NC NC NC NC

TS: 10 11 12 13 14 15 16 17 18 19
TYPE: NC NC NC NC NC NC NC NC NC NC

TS: 20 21 22 23 24 25 26 27 28 29
TYPE NC NC NC NC NC NC NC NC NC NC

TS: 30 31
TYPE: NC NC

• TS – HDSL link timeslot number 0 through 31

• TYPE – Type of timeslot assignment
ƒ NC – Timeslot not assigned
ƒ DATA – Timeslot is assigned to data channel

EXIT

Purpose
End the current control session and return control to the HTU-2 front panel.

Syntax
EXIT

Use
• Enter:
EXIT<Enter>
HTU-2 executes the command and displays the date and the time
followed by the HTU-2>prompt.

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

Purpose
Define the codes used to be sent to the supervision terminal to perform the
following terminal control functions:
• Clear the screen
• Move the cursor to the screen home position
• Move the cursor to the right by one position.

The codes used by typical terminals are listed in Table G-13:

Table G-13. Terminal Control Codes

Function Terminal Type

TV920 VT52 VT100 Freedom100 Freedom220
Clear Screen 1B2A0000 N/A 1B5B324A 1B2A0000 1B5B324A
Cursor Home 1E000000 1B480000 1B5B4800 1E000000 1B5B4800
Cursor Right 0C000000 1B430000 1B5B3143 0C000000 1B5B0143

Syntax
F
Use
1. To display the current codes, enter:
F<Enter>
HTU-2 displays the entry line for the first parameter:

CLEAR SCREEN = hhhhhhhh

2. To change a code, enter the appropriate hexadecimal digits of the code, then
press <Enter> to bring the cursor under the first digit of the next code to be
changed.
3. Repeat the procedure until all the parameters are defined, then press
<Enter> to set the new parameters.
A typical display, as seen after all the parameters are selected, is shown
below:

CLEAR SCREEN = hhhhhhhh

CURSOR HOME = hhhhhhhh
CURSOR RIGHT = hhhhhhhh

where h indicates hexadecimal digits.

HTU-2 executes the command and displays the date and the time
followed by the HTU-2> prompt.

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

H or HELP

Purpose
Display an index of the control port commands and the options available for each
command.

Syntax
H or HELP

Use
• Enter:

H or Help<Enter>
HTU-2 displays the first HELP page. Press any key to display the next page.
When finished, HTU-2 displays the date and the time followed by the HTU-2>
prompt.
Note The set of commands displayed depends on the type of the remote appliance. After
turning on the system, you will have to wait for 2-3 minutes until this information is
displayed. Use the DSP ST SYS command to display the type of the remote
appliance. Only after the type displayed is no longer “Unknown HTU”, you can be
sure that H command displays the complete information.

INIT DB

Purpose
Erase the user-defined configuration from the database and load the database with
a specified set of default parameter values (see Table G-14).

Syntax
INIT DB

Use
• Enter:
INIT DB<Enter>
This command loads the default parameters and resets the HTU-2.
Note This command causes HTU-2 to initialize; therefore traffic through HTU-2 will be
disrupted until HTU-2 returns to normal operation. You will have to reconfigure the
unit.

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Table G-14. HTU-2 Default Configuration

Parameter Type Parameter Designation Default Value

General PASSWORD HTU
NODE (node number) 0
CLEAR SCREEN 1B5B324A
CURSOR HOME 1B5B4800
CURSOR RIGHT 1B5B3143
System* CLK_MASTER INT
CONFIG REM YES
Data Channel FRAME FRAMED
MULTIPLIER 64
SPEED 64 kbps
MAP USER
START_TS N/A
CTS ON
ETHERNET_MODE HALF_DUP
BRIDGING FILTERED
TS 0 DATA
TS 1 – TS 31 NC
SP (control port) SPEED AUTO
DATA 8
PARITY NO
INTERFACE DCE
CTS =RTS
DCD_DEL 0_MS
DSR ON
POP_ALM NO
PWD NO
LOG_OFF NO
AUXILIARY DEVICE TERMINAL
CALL_OUT_MODE NONE

INIT F
Purpose
Resets the terminal control codes used to clear the terminal screen, to move the
cursor to the right, and to return the cursor to the home position to 0.

Syntax
INIT F

Use
• Enter:
INIT F<Enter>
HTU-2 executes the command and displays the date and the time
followed by the HTU-2> prompt.

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Appendix G Parameters and Terminal Commands HTU-2 Installation and Operation Manual

LOOP
Purpose
Activate a user-controlled loopback on HTU-2. Refer to Diagnostic Tests in
Chapter 5 for a description of HTU-2 loopbacks.

Syntax
LOOP [loop type]

Use
• To activate a loopback, enter the appropriate command. The commands
depend on the loopback type and on the channel or link for the loopback to
be performed on.
HTU-2 executes the requested command and displays the date and time,
followed by the HTU-2> prompt.
Table G-15 lists the available loopback commands.
Table G-15. Loopback Commands
To activate Enter
A local (L) loopback on the HDSL lines (only from the unit configured as LOOP L LINE or LP L LINE
central)
A local (L) loopback on the data channel of the local HTU-2 LOOP L CH or LP L CH
A remote (R) loopback on the data channel of the local HTU-2 LOOP R CH or LP R CH
A remote (R) loopback on the data channel of the remote HTU-2 (only LOOP R R CH or LP R R CH
from HTU-2 configured as central)
A local loopback on H-RPT (only from the unit configured as central) LOOP L HRPT or LP L HRPT

Note At any time, you can activate only one loopback. If you try to activate a second
loopback, HTU-2 displays an error message (illegal loop combination). You must
deactivate the other loopback before you can activate the new one.

RESET
Purpose
Reset HTU-2. This command causes HTU-2 to initialize; therefore traffic through
HTU-2 will be disrupted until HTU-2 returns to normal operation.

Syntax
RESET

Use
• To reset HTU-2, enter:
RESET<Enter>

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HTU-2 Installation and Operation Manual Appendix G Parameters and Terminal Commands

TIME
Purpose
Set the time for the HTU-2 internal real-time clock.

Syntax
TIME

Use
1. Enter:
TIME<Enter>
HTU-2 sends the entry line for the first parameter:

HOUR [2 DIGITS] = 12

2. Press <Enter> to accept the current parameter value and continue to the next
line. Otherwise, type in the new hour, then press <Enter> to confirm the new
value.
HTU-2 displays the entry line for the minutes.
3. Repeat the procedure in step 2 to set the minutes.
HTU-2 displays the entry line for the seconds.
Tip Set the time about one minute beyond the current time then press <Enter> at the
correct instant.
4. Repeat the procedure in step 2 to set the seconds, then press <Enter> to
confirm the new time.
A typical display, as seen after all the parameters are selected, is shown below:
HOUR = 12
MINUTE = 25
SECOND = 16

HTU-2 displays the date and time (note that the time has changed), followed
by the HTU-2> prompt.

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G-38 Control Terminal Commands

 Appendix H
SNMP Management
This appendix provides specific information required for managing HTU-2 via
Simple Network Management Protocol (SNMP).
HTU-2 configured as a central unit serves as a proxy agent for the remote unit to
which it is connected. Therefore, an SNMP-based network management station
connected to a central HTU-2 unit can perform all the management functions
available on the remote unit. This is particularly applicable to HTU-2/P units,
which can operate only as remote units.

H.1 SNMP Environment

General
The SNMP management functions of HTU-2 are provided by an internal SNMP
agent, which communicates through the HTU-2 control port using the Serial Link
Internet Protocol (SLIP).
The SNMP management communication uses the User Datagram Protocol (UDP).
UDP is a connectionless-mode transport protocol, part of the Internet Protocol (IP)
suite of protocols.

Note Telnet management uses the TCP protocol over IP for management communication.
After a Telnet session is started, the management interface is similar to that used for
the supervisory terminal (refer to Chapter 3).
This section covers the information related to the SNMP environment. For a
description of the IP environment, refer to IP Environment below.
SNMP Principles
The SNMP management protocol is an asynchronous command/response polling
protocol. All management traffic, except for trap messages, is initiated by the
SNMP-based network management station, which addresses the managed entities
in its management domain. Only the addressed managed entity answers the
polling of the management station.
The managed entities include a function called an “SNMP agent”, which is
responsible for interpretation and handling of the management station requests to
the managed entity, and the generation of properly-formatted responses to the
management station.

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Appendix H SNMP Management HTU-2 Installation and Operation Manual

SNMP Operations
The SNMP protocol includes four types of operations:
getRequest Command for retrieving specific management information
from the managed entity. The managed entity responds
with a getResponse message.
getNextRequest Command for retrieving sequentially specific management
information from the managed entity. The managed entity
responds with a getResponse message.
setRequest Command for manipulating specific management
information within the managed entity. The managed entity
responds with a setResponse message.
trap Management message carrying unsolicited information on
extraordinary events (that is, events which occurred not in
response to a management operation) reported by the
managed entity.

The Management Information Base

The management information base (MIB) includes a collection of managed
objects. A managed object is defined as a parameter that can be managed, such as
a performance statistics value.
The MIB includes the definitions of relevant managed objects. Various MIBs can
be defined for various management purposes, types of equipment, etc.
An object's definition includes range of values (also called “instances”) and
“access” rights:
Read-only Object value can be read, but cannot be set.
Read-write Object value can be read or set.
Not accessible Object value can neither be read nor set.

MIB Structure
The MIB has an inverted tree-like structure, with each definition of a managed
object forming one leaf, located at the end of a branch of that tree. Each “leaf” in
the MIB is reached by a unique path. Therefore, by numbering the branching
points, starting with the top, each leaf can be uniquely defined by a sequence of
numbers. The formal description of the managed objects and the MIB structure is
provided in a special standardized format, called Abstract Syntax Notation 1
(ASN.1).
Since the general collection of MIBs can also be organized in a similar structure,
under the supervision of the Internet Activities Board (IAB), any parameter
included in a MIB that is recognized by the IAB is uniquely defined.

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HTU-2 Installation and Operation Manual Appendix H SNMP Management

To provide the flexibility necessary in a global structure, MIBs are classified in

various classes (branches), one of them being the experimental branch, and
another the group of private (enterprise-specific) branches. Under the private
enterprise-specific branch of MIBs, each enterprise (manufacturer) can be assigned
a number, which is its enterprise number. The assigned number designates the top
of an enterprise-specific sub-tree of non-standard MIBs. Within this context, RAD
has been assigned the enterprise number 164. Therefore, enterprise MIBs
published by RAD can be found under 1.3.6.1.4.1.164.
MIBs of general interest are published by the IAB in the form of a Request for
Comment (RFC) document. In addition, MIBs are also often assigned informal
names that reflect their primary purpose. Enterprise-specific MIBs are published
and distributed by their originator, which is responsible for their contents.

MIBs Supported by the HTU-2 SNMP Agent

The interpretation of the relevant MIBs is a function of the SNMP agent of each
managed entity. The general MIBs supported by the HTU-2 SNMP agent are as
follows:
• RFC 1158 (standard MIB-II)
• RFC 1406 (standard E1/T1 MIB).

In addition, the HTU-2 SNMP agent supports the RAD-private (enterprise-specific)

MIB identified as (read the following as a continuous string):
iso(1).org(3).dod(6).internet(1).private(4).enterprises(1).
rad(164).radGen(6).systems(1).radSysWAN(3).radHtuE1Sa.
Enterprise-specific MIBs supported by RAD equipment, including those for the
HTU-2, are available in ASN.1 format from the RAD Technical Support
Department.
Management Domains Under SNMP
In principle, SNMP enables each management station that knows the MIBs
supported by a device to perform all the management operations available on that
device. However, this is not desirable in practical situations, so it is necessary to
provide a means to delimit management domains.

SNMP Communities
To enable the delimitation of management domains, SNMP uses “communities”.
Each community is identified by a name, which is an alphanumeric string of up to
32 characters defined by the user.
Any SNMP entity (this term includes both managed entities and management
stations) is assigned by its user a community name.

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Appendix H SNMP Management HTU-2 Installation and Operation Manual

Access Restriction Using SNMP Communities

In general, SNMP agents support two types of access rights:
• Read-only: the SNMP agent accepts and processes SNMP getRequest and
getNextRequest commands only from management stations which have the
same read-only community name.
• Read-write: the SNMP agent accepts and processes all SNMP commands
received from a management station with the same read-write community
name.

For each SNMP entity, it is possible to define a list of the communities which are
authorized to communicate with it, and the access rights associated with each
community (this is the SNMP community names table of the entity). For example,
the SNMP community names table of HTU-2 can include three community
names.
In accordance with the SNMP protocol, the SNMP community of the originating
entity is sent in each message.
When an SNMP message is received by the addressed entity, first it checks the
originator's community. If the community name of the message originator differs
from the community name specified for that type of message in the agent, the
message is discarded (SNMP agents of managed entities report this event by means
of an authentication failure trap).

HTU-2 Communities
The SNMP agent of HTU-2 can use the following community types:
Read SNMP community that has read-only authorization, i.e., the
SNMP agent will accept getRequest and getNextRequest
commands only from management stations using that
community.
The default read-only community for RAD network
management stations is public.
Write SNMP community that has read-write authorization, i.e., the
SNMP agent will also accept setRequest commands from
management stations using that community.
The default read-write community for RAD network
management stations is private.
Trap SNMP community which the SNMP agent will send within trap
messages.
The default trap community for RAD network management
stations is public.

H-4 SNMP Environment

HTU-2 Installation and Operation Manual Appendix H SNMP Management

H.2 IP Environment
The SNMP agent of HTU-2 can communicate out-of-band using the Serial Link
Internet Protocol (SLIP).
IP Environment
The SNMP agent of HTU-2 uses either the UDP or the TCP transport protocol,
part of the suite of IP protocols.

IP Address Structure
Under the IP protocol, each IP network element (SNMP agents, network
management stations, etc.) is called an IP host and must be assigned an IP address.
An IP address is a 32-bit number, usually represented as four 8-bit bytes. Each byte
represents a decimal number in the range of 0 through 255.
The address is given in decimal format, with the bytes separated by decimal points,
e.g., 164.90.70.47. This format is called dotted quad notation.
An IP address is logically divided into two main portions:
Network Portion. The network portion is assigned by the Internet Assigned
Numbers Authority (IANA). There are five IP address classes: A, B, C, D, and E.
However, only the classes A, B and C are used for IP addressing. Consult your
network manager with respect to the class of IP addresses used on your network.
The network portion of an IP address can be one, two or three bytes long, in
accordance with the IP address class. This arrangement is illustrated below:
IP ADDRESS
Byte 1 Byte 2 Byte 3 Byte 4

Class A Network Portion Host Portion

Class B Network Portion Host Portion

Class C Network Portion Host Portion

The class of each IP address can be determined from its leftmost byte, in
accordance with the following chart:

Address Class First Byte Address Range

Class A 0 to 127 0.H.H.H to 127.H.H.H
Class B 128 to 191 128.N.H.H to 191.N.H.H
Class C 192 to 223 192.N.N.H to 223.N.N.H

N – indicates bytes that are part of the network portion

H – indicates bytes that are part of the host portion

IP Environment H-5
Appendix H SNMP Management HTU-2 Installation and Operation Manual

Host Portion. The host portion is used to identify an individual host connected to
the network. The host identifier is assigned by the using organization, in
accordance with its specific needs.
Note The all-zero host identifier is always interpreted as a network identifier, and must
not be assigned to an actual host.
Often, the host portion is further subdivided into two portions:
Subnet number – For example, subnet numbers can be used to identify
departmental subnetworks. The subnet number follows the network identifier.
Host number – The last bits of the IP address.

H.3 SNMP Traps

The SNMP agent of HTU-2 supports the standard MIB-II traps. In addition, HTU-2
reports alarm conditions to the management station by means of the proprietary
traps:
When an alarm condition occurs or, HTU-2 sends a modmSaAlarmTrap, which
carries all the alarms active at the time the trap is sent.
Whenever front panel LEDs change state, HTU-2 sends a modmSaLedTrap, which
reports the state of the LEDs on both central and remote HTU-2 units.

H-6 SNMP Traps

 Appendix I
Operating Environment
This appendix includes a concise description of the HDSL environment, to provide
the background information required for understanding the configuration
parameters of the HTU-2 system.

I.1 HDSL Environment

Transmission Media
HDSL systems are intended to operate on the local subscriber plant, which
typically uses a mixture of unshielded twisted-wire pairs. Moreover, it is also
necessary to tolerate bridged taps. HDSL systems properly operate on this media.
The only requirement is that the line must not be loaded. In addition, it is assumed
that the nominal impedance of the pair is 135Ω, and that the pair is balanced with
respect to ground.
HDSL Line Signal
The line code on the HDSL line is 2B1Q (2 Binary, 1 Quaternary). This is a
four-level pulse-amplitude modulation code without redundancy, under which
each pair of information bits is converted to a quaternary symbol, called quat (bits
can assume two levels, whereas quats have four levels).
The encoding rule of the 2B1Q code is as follows:

Binary Digits Quaternary Symbol

00 -3
01 -1
10 +3
11 +1

The levels of the quaternary signal are symmetrically located around the 0V, and
the nominal peak symbol level specified by the HDSL standards is 2.64V.
Figure I-1 illustrates the 2B1Q encoding rule.

HDSL Environment I-1

Appendix I Operating Environment HTU-2 Installation and Operation Manual

+3 (+2.64V)

+1 (+0.88V)
(0.00V) time
-1 (-0.88V)

-3 (-2.64V)
Quats -1 +3 +1 -3 -3 +1 +3 -3 -1 -1 +1 -1 -3 +3 +3 -1 +1
Bits 01 10 11 00 00 11 10 00 01 01 11 01 00 10 10 01 11

Figure I-1. 2B1Q Encoding Rule

Due to the encoding of two bits into one symbol, the symbol rate on the HDSL
line is half the bit rate. Taking into consideration a payload rate of 2048 kbps and
framing overhead, for two-loop operation the required per-loop data rate is
1168 kbps (equivalent to a symbol rate of 584 kbaud).
By reducing the line symbol rate, the maximum range that can be reached is
increased. Together with the advanced digital signal processing techniques
implemented in HDSL systems, this results in a robust data transmission system
that can reliably operate over regular unconditioned local loops, while exceeding
several times the ranges that can be achieved by direct transmission of an E1
signal.
HDSL Line Signal Structure
The HDSL line signal is organized in frames. Each frame has a nominal duration of
6 msec: this translates to 3504 quats (7008 bits) for two-loop systems. However,
due to the use of stuffing, frames without stuffing quats are actually one quat
shorter, while frames with stuffing are one quat longer than the nominal.
The HDSL frames carry the following types of data:
• Core frames
• Synchronization words
• HDSL overhead quats.

A core frame consists of 144 bytes (1152 bits). The structure of the core
frames depends on the type of data being carried. The core frames are split,
on a per byte basis, for transmission in parallel over the HDSL lines. Figure I-2
shows the mapping of the 32 application timeslots of the core frame into the
two groups of 18 timeslots carried by the two HDSL lines:
ƒ Timeslots 0 and 16 are carried in parallel on both HDSL lines.
ƒ HDSL line 1 carries the odd-numbered application timeslots up to timeslot
16, and then even-numbered application timeslots.
ƒ HDSL line 2 carries the even-numbered application timeslots up to timeslot
16, and then odd-numbered application timeslots.
ƒ The last HDSL timeslot is filled with ones (AIS signal).

The synchronization word consists of 7 quats, and its function is to enable

HDSL frame alignment.

I-2 HDSL Environment

HTU-2 Installation and Operation Manual Appendix I Operating Environment

2048 kbps Data Timeslots Inserted in HDSL HDSL

at the Application Core Frame with Line 1 Line 2
Frame Interface 2048 kbps Data
TS0 0
TS0 TS0 TS0
TS0 1
TS1 TS1 2
TS1 TS2
TS2 TS2 3
TS3 TS3 4
TS3 TS4
TS4 TS4 5
TS5 TS5 6
TS5 TS6
TS6 TS6 7
TS7 TS7 8
TS7 TS8
TS8 TS8 9
TS9 TS9 10
TS9 TS10
TS10 TS10 11
TS11 TS11 12
TS11 TS12
TS12 TS12 13
TS13 TS13 14
TS13 TS14
TS14 TS14 15
TS15 ⇔ TS15 16 ⇔
TS15 TS16
TS16 Mapping into TS16 17 Mapping to the
TS17 Core Frames TS16 18 two HDSl Lines
TS16 TS17
TS18 TS17 19
TS19 TS18 20
TS18 TS19
TS20 TS19 21
TS21 TS20 22
TS20 TS21
TS22 TS21 23
TS23 TS22 24
TS22 TS23
TS24 TS23 25
TS25 TS24 26
TS24 TS25
TS26 TS25 27
TS27 TS26 28
TS26 TS27
TS28 TS27 29
TS29 TS28 30
TS28 TS29
TS30 TS29 31
TS31 TS30 32
TS30 TS31
TS31 33
AIS 34
AIS AIS
AIS 35

Figure I-2. Mapping of Core Frame into HDSL Frames

HDSL Environment I-3

Appendix I Operating Environment HTU-2 Installation and Operation Manual

16 HDSL overhead quats are used to carry the following data:

ƒ Indications such as far-end block error (FEBE), loss of signal and bipolar
violations on the E1 interface.
ƒ Embedded operations channel (EOC). The EOC allows supervision and
management of system operation (status, diagnostic loopbacks and tests,
repeater support, etc.) or vendor-defined functions (e.g., configuration
downloading).
ƒ Identification of the HDSL line number (seven quats). This allows the
receiver to detect unintentional interchange of pairs.

HDSL-Related System Functions

The HDSL subsystem performs the following main functions:
• Mapping of input data bits into HDSL frames, for transmission on the HDSL
lines
• Start-up process
• Frame alignment
• Loop identification and correction
• System management by means of the EOC
• Collection of performance data.

To achieve proper operation, the management of the HDSL subsystem is

performed under the control of the central unit (LTU) unit, which provides the
timing reference for HDSL line transmission, and manages the communication on
the EOC with the remote unit (the NTU) located on the customer's side.
The transmission of data on each HDSL line is full duplex. To enable duplex
transmission over one pair, the HDSL transceivers use an echo canceller, based on
advanced digital signal processing (DSP) techniques. When starting system
operation, the echo canceller is “trained”, to enable the separation of the received
signal from the transmit signal (near-end crosstalk - NEXT). The training is
performed by transmitting a special sequence for a predetermined period. This
process is called “start-up process”; data transmission can start only after its
successful completion.

I-4 HDSL Environment

 Index

index of, 3-16, G-34

—A— options, 3-16
Alarms troubleshooting command entry, 3-15
clearing, 5-10, G-7, G-8 Commands list
displaying, 5-10, G-22 ALM REM, G-8
displaying remote, G-24 CLR ALM, G-7
H-RPT, 5-2 CLR ALM HRPT, G-7
ON/OFF type, 5-2 CLR LOOP, G-8
ON-state, 5-2 CLR TST, G-9
ON-type, 5-2 DATE, G-10
overview, 5-2 DEF AGENT, G-10
Alarms list DEF CALL, G-12
ALARM BUFFER OVERFLOW, 5-3 DEF CH, G-14
CLOCK WAS CHANGED TO INTERNAL, 5-4 DEF NAME, G-16
DB CHECKSUM ERROR, 5-3 DEF NODE, G-17
DB-INIT SWITCH IS ON, 5-3 DEF PB, G-17
DP ALTERNATE CALL FAILED, 5-3 DEF PWD, G-18
DP DIAL CYCLE FAILED, 5-3 DEF SP, G-19
DP PRIMARY CALL FAILED, 5-3 DEF SYS, G-21
DTE NOT CONNECTED TO CH, 5-4 DEF TERM, G-21
ELASTIC BUFFER ERROR, 5-4 DSP ALM, G-22
ELASTIC BUFFER OVERFLOW, 5-4 DSP ALM HRPT, G-23
HARDWARE FAILURE, 5-4 DSP ALM REM, G-24
HDSL STUFFING OVERFLOW, 5-6 DSP HDR TST, G-24
LOCAL CRC ALM, 5-4 DSP HDSL PM, G-25
LOOPS ARE INVERTED, 5-5 DSP PB, G-26
PHASOR OVERFLOW, 5-5 DSP R HDR TST, G-27
PSWRD SWITCH IS ON, 5-5 DSP R HDSL PM, G-28
REAL TIME CLOCK BATTERY FAILURE, 5-6 DSP ST CH, G-28
REMOTE BPV ERROR, 5-5 DSP ST LINE, G-29
REMOTE CRC ALM, 5-5 DSP ST SYS, G-30
REMOTE INDICATION ALARM, 5-5 DSP TS, G-32
REMOTE SIGNAL LOSS, 5-6 EXIT, G-32
SELF TEST ERROR, 5-6 F, G-33
SIGNAL LOSS, 5-6 HELP, G-34
SP-PAR SWITCH IS ON, 5-6 INIT DB, G-34
SYNC LOSS, 5-7 INIT F, G-35
TIMING OVERFLOW, 5-7 LOOP, G-36
AUTOBAUD, 3-11 RESET, G-36
TIME, G-37
Configuration error messages, 5-11
—B—
Buttons, 3-5 Connecting interfaces
data port, 2-5
HDSL line, 2-6
—C— supervisory port, 2-6
Call-out, G-12 Connecting power
Clear to Send. See CTS AC-powered unit, 2-7
Clearance, 2-1 DC-powered unit, 2-7
Commands phantom-fed unit, 2-7
entering, 3-14

I-1
Index HTU-2 Installation and Operation Manual

Connector line coding, I-1

control port, A-5 signal structure, I-2
DCE interface, A-1 system functions, I-4
HDSL, A-1 transmission media, I-1
IR-E1, F-1 user data mapping, I-2
IR-ETH, B-1 H-RPT
IR-ETH/Q, C-1 alarms, 5-2, 5-8, G-7, G-23
IR-IP, D-4 clearing alarms, G-7
IR-X21B, E-1 clearing loopback, G-9
RS-530, A-2 detecting, G-2
V.35, A-4 displaying alarms, G-23
V.36/RS-449/422, A-3 hardware version, G-31
Control port loopback, 5-17, 5-18, G-9, G-30, G-31, G-36
connector, A-5 software version, G-31
handshaking protocol, 3-9 HTU-2
interface, 3-9 default parameters, G-34
parameters, G-19 front panel, 3-1
CTS, 3-10 installation, 2-2
selecting, G-4, G-16 operating instructions, 3-6
physical description, 1-4
—D— rear panel, 2-5
Data Carrier Detect. See DCD troubleshooting, 5-12
Data port HTU-2/PF
connecting, 2-5 physical description, 1-4
interface cables, 2-5 rear panel, 2-5
IR-E1 interface module, F-1 HTU-E1, 4-5, G-3
IR-ETH interface module, B-1
IR-ETH/Q interface module, C-1 —I—
IR-IP interface module, D-1 IP, H-5
IR-X21B interface module, E-1 address structure, H-5
Data Set Ready. See DSR IR-E1
Data Terminal Ready. See DTR jumper settings, F-2
Date, G-10 module layout, F-2
DB INIT switch, 2-3 selecting the clock, F-3
DCD, 3-11 IR-ETH
connecting to LAN, B-4
DEF SP switch, 2-4
connector, B-1
Default parameters, G-34
DIP switch, B-4
DSR, 3-11 LEDs, B-4
DTR, 3-10 module layout, B-3
technical specifications, B-2
—E— IR-ETH/Q
Errors, 5-11 connecting to LAN, C-4
Exiting control session, G-32 connector, C-1
DIP switch, C-3
—F— LEDs, C-4
Front panel module layout, C-3
buttons, 3-5 technical specifications, C-2
description, 3-1 IR-IP
LCD, 3-3 application, D-2
LEDs, 3-1 assigning IP address, D-7
management activities, 3-19 changing IP address, D-8
configuring Telnet connection, D-6, D-13
connector, D-4
—H—
default communication parameters, D-5
Hardware test results, G-24, G-27
default gateway, D-12
HDSL diagnostics, D-26
connector, A-1 DIP switch, D-3
displaying remote statistics, G-28 downloading new software releases, D-21, D-29
displaying statistics, G-25

I-2
HTU-2 Installation and Operation Manual Index

erasing application software, D-28 —N—

erasing user's configuration, D-28 Node number, G-17
IP learning, D-7
LAN interface, D-15 —P—
LEDs, D-3
Package contents, 2-1
management software, D-9, D-10
menu map, D-10
Parameters
call-out, G-12
multicasting, D-19
control port, G-5, G-19
overview, D-1
data channel, 4-4, 4-5, G-3, G-14
ping utility, D-26
default, G-34
preliminary configuration, D-5
priority bumping, 4-6, G-6, G-17
quick setup, D-11
resetting, D-22 SNMP agent, G-10
system, 4-3, 4-4, G-2, G-21
technical specifications, D-2
troubleshooting, D-8 PASSWD switch, 2-4
viewing configuration, D-23 Password, G-18
viewing error log, D-22 Performance monitoring, 5-14, G-25, G-28
viewing statistics, D-25 clearing HDSL registers, G-25
WAN Frame Relay parameters, D-16 clearing registers from the LCD, 5-14
WAN interface, D-12, D-15, D-16 clearing remote HDSL registers, G-28
WAN PPP parameters, D-17 displaying on the LCD, 5-14
IR-X21B Phantom power feeding, 1-9, 2-7
jumper settings, E-2 Power
selecting the clock, E-2 AC source, 2-1, 2-7
DC source, 2-1, 2-7
—J— remote feeding, 2-7
Jumpers, 2-2 Power-up self test, 3-6, 5-1
Priority bumping, 1-3, G-3, G-6, G-17, G-26
—L—
LCD, 3-3, 3-4, 3-8 —R—
menu structure, 3-3 Rear panel, 2-5
LEDs, 3-1, 3-8, 5-1 Remote power feeding, 1-9, 2-7
Loopback list Request to Send. See RTS
LOCAL CH, 5-18 Resetting control codes, G-35
LOCAL HRPT, 5-18 Resetting HTU-2, G-36
LOCAL LINE, 5-19 RI, 3-11
REM CH, 5-19
Ring Indication. See RI
REM REM CH, 5-20
Routing modes, 1-3
Loopbacks
RS-530 interface connector, A-2
activating, G-36
clearing, G-8, G-9 RTS, 3-10
general, 5-16
operating from the front panel, 5-16 —S—
operating from the terminal, 5-17 Self-test, 5-1
Serial Link Internet Protocol. See SLIP
—M— SLIP, H-1
Managed objects, H-2 SNMP, G-10, H-1
Management communities, H-3
ending control session, 3-15 management information base, H-2
front panel, 3-19 operations, H-2
list of activities, 3-19 traps, H-6
starting control session, 3-13 Stacking, 2-1
supervisory terminal, 3-19 Statistics, 5-14
Telnet, 3-9 clearing HDSL registers, G-25
Management information base. See MIB clearing registers from the LCD, 5-14
MIB, H-2 clearing remote HDSL registers, G-28
structure, H-2 displaying HDSL statistics, G-25
Modems, 3-9 displaying on the LCD, 5-14
displaying remote HDSL statistics, G-28

I-3
Index HTU-2 Installation and Operation Manual

Status displaying mapping, G-32

data channel, G-28 sequential bundling, 1-3
HDSL line, G-29 Timing
system, G-30 selecting the source, G-2, G-21
Supervisory terminal Troubleshooting, 5-12
defining control codes, G-33 Turn off, 3-8
defining terminal type, G-21 Turn on, 3-6
management activities, 3-19
preparing for control session, 3-12
—U—
Switches, 2-2 UDP, H-1
System parameters, G-21 User Datagram Protocol. See UDP
System status, G-30
—V—
—T— V.35 interface connector, A-4
Temperature, 2-1 V.36/RS-449/422 interface connector, A-3
Time, G-37
Timeslots —X—
alternate bundling, 1-3
X.21 interface connector, E-1
defining priority bumping, 4-6, G-6, G-17

I-4
 DC Power Supply Connection
Note: 1) Ignore this supplement if the unit operates on AC power. 24or 48V
+
2) See supplement SUP-209 for Megaplex/MAXcess units.
The DC-powered unit comes with a standard 3-pin (male) connector located
at unit rear (see figure at right). Supplied with the unit is a compatible (female) cable
connector for attaching to your power supply cable.
DC Power Supply Wire Voltage Polarity CHASS
GND
• If your power supply cable already has a compatible connector, just verify that the
voltage polarity is as required.
• If not, connect the wires of your power supply cable to the supplied cable connector,
according to the voltage polarity shown below. Note that the solder side of the connector
is shown. Refer to the cable connector assembly figure below for assistance.

Warning: reversing the wire voltage polarity can cause serious damage to the unit!

Cable Connector (Female) Voltage Polarity

(solder side)
for -24 or -48 VDC: for +24 or +48 VDC:
GROUND VDC INPUT VDC INPUT GROUND
(0) (Negative pole) (Positive pole) (0)
1 3 1 3

2 2

CHASSIS CHASSIS
(FRAME ) (FRAME)
GROUND GROUND

Cable Connector Assembly

SUP-207-02/99
 DC Power Supply Connection – Terminal Block Connector
Note: Ignore this supplement if the unit is AC-powered.
DC-powered units are equipped with a plastic 3-pin VDC-IN power input connector, located on the unit
rear panel. Supplied with such a unit, is a mating Terminal Block (TB) type connector plug for attaching to
your power supply cable.
Connect the wires of your power supply cable to the TB plug, according to the voltage polarity and
assembly instructions provided below.
Caution: Prepare the connections to the TB plug before inserting it into the VDC-IN connector.

Preparing and Connecting the TB Plug DC Power Input W ire stripping

Connector 20 m m dim ensions
Refer to Figure 1 for assistance. (on un it pa ne l)
5 mm
1. Strip the insulation of your power supply
cable wires according to the dimensions
shown.
Term in al screw s
2. Place each wire lead into the
appropriate TB plug terminal
according to the voltage polarity
mapping shown in Figure 2.
(If the terminal is not already open,
loosen its terminal screw.) N ylon ca ble tie

Se e Fig ure 2
3. Tighten the three terminal screws. fo r m ap ping

4. Pull a nylon cable tie (supplied) around M ating

the power supply cable to secure it TB C onnector D C pow er
Plug cable
firmly to the TB plug grip (pass the tie
TB plug g rip
through the holes on the grip).
Fig ure 1
5. Isolate the exposed terminal screws / wire
leads using a plastic sleeve or insulating tape, to prevent the possibility of short-circuit.
6. Connect the assembled power supply cable to the unit by inserting the TB plug into the unit’s
VDC-IN connector, until it snaps into place.

DC Power Supply Wire Voltage Polarity

Refer to Figure 2 for proper mapping of the For -24 or -48 V D C input: For +24 or +48 V D C input:
power supply wire leads to the TB plug’s three
terminals.

0 -4 8 (or -24 ) 0 -4 8 (or -24 )

Warning: G ro u nd C ha ssis V D C in p ut V D C in p ut C ha ssis G ro u nd

Reversing the wire voltage polarity can cause (0 ) (fra m e ) (n eg a tive po le) (p ositive p ole ) (fra m e ) (0 )
G ro u nd G ro u nd
serious damage to the unit! Figure 2

SUP-220-04/00