HCD-4

4 Mbps HDSL-Based Data Modem

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

© 1998–2001 RAD Data Communications Publication No. 178-200-12/01

 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.

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 the HCD-4 are declared according to EN41003 and is detailed
in Table 1 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.

Ports Safety Status

Data channels, supervisory Circuit operating with Safety Extra-Low Voltage
port, alarm relay, LAN
HDSL Circuit whose normal operating voltage is within the limits of
SELV, on which overvoltages from Telecommunications Networks
are possible.

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.
 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: HCD-4

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

EMC: EN 55022 (1984) 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, April 22nd, 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 HCD-4, use this guide to prepare it for operation.

1. Jumper and Switch Settings

If you are using HCD-4 as a central (LTU) unit, you can use the default settings for
the HCD-4 jumpers and switches.
➤ If you are using HCD-4 as a remote (NTU) unit, perform the following steps:
1. Turn the unit off.
2. Set section 4 of the Setup DIP switch on the rear panel to ON.
3. Set section 3 of the Setup DIP switch to ON (to load the database with default
values).
4. Turn the unit on for a short time (until the self-test is completed).
5. Turn the unit off.
6. Set section 3 of the Setup DIP switch to OFF.
7. Turn the unit on.

2. Cable and Power Connections

➤ Before using HCD-4, make the following cable connections:
1. Connect the data channel interface.
2. To connect remote equipment (HDSL line) to HCD-4, connect the cable to
the RJ-45 connector designated HDSL.
3. If you are using a control terminal, connect a cable between the control
terminal and the port designated CONTROL DCE.
4. Connect HCD-4 to the power source, as follows:
For the AC version of HCD-4, 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 HCD-4 rear panel, then to
the power source.
For the DC version of HCD-4, refer to the DC Power Supply Connection
Supplement.

Cable and Power Connections 1

Quick Start Guide HCD-4 Installation and Operation Manual

3. Configuration
You can configure and operate HCD-4 from either the front panel or a supervisory
terminal.
Configuring HCD-4 from Front Panel
➤ To configure HCD-4 from the front panel:
1. If your HCD-4 is configured as central, scroll to SYSTEM PARAMETER in the
top row of the front panel LCD and set the system parameters.
2. Scroll to PORT PARAM CH in the top row of the front panel LCD and
configure the data rate. This command also allows you to set several other data
transfer parameters, depending on whether or not the channel has an Ethernet
interface.
The remote unit automatically downloads the configuration of the central unit,
unless the CONFIG REMOTE parameter in the SYSTEM PARAMETER screen of
the central unit is set to NO.
Configuring HCD-4 from a Supervisory Terminal
If you want to manage HCD-4 from a remote supervisory terminal, you must
prepare the unit by setting its control port parameters from the front panel.
➤ To prepare HCD-4 for remote supervisory terminal control:
1. Scroll to SP PARAMETERS in the top row of the front panel LCD.
2. Set the data rate, parity, interface, and management mode parameters for the
control port.
➤ To configure HCD-4 from a supervisory terminal:
1. Configure the terminal as follows:
Select full-duplex mode.
Turn the terminal echo off.
Disable any type of flow control.
2. If the terminal displays the password prompt (PASSWORD>), enter the
password. The default password is HCD4. If the node number of the HCD-4
unit is a number other than zero, enter the node number along with the
password; or, if there is no password prompt, just enter the node number. Use
the following syntax:
NODE<Space>’node number’<Space>’password’<Enter>
The prompt HCD-4> appears.
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, HCD-4 resets all the control
terminal codes to 0.

2 Configuration
HCD-4 Installation and Operation Manual Quick Start Guide

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 DEF SP or DEF CONTROL command to set the control port
parameters. The following settings are recommended: one start bit, eight data
bits, no parity, one stop bit.
5. Use the DEF SYS command to set the system parameters.
6. Use the DEF CH command to set the data channel parameters.
7. If you are using the terminal to control a single HCD-4 unit, do not change the
node number 0 assigned to the unit. For multidrop operation, you can assign
each HCD-4 unit a node number between 1 and 255. Use the DEF NODE
command to assign a node number.
8. You can assign each HCD-4 unit a logical name of up to eight characters. The
logical name helps identify the source of alarm messages that the HCD-4 sends
to the supervision terminal. Use the DEF NAME command to assign a logical
name.
9. To reset HCD-4, use the RESET command. This command causes HCD-4 to
initialize, disrupting traffic through the HCD-4 until it resumes normal
operation.
Tips • Use the HELP command to display the correct syntax and mnemonics 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.

Configuration 3
Quick Start Guide HCD-4 Installation and Operation Manual

4 Configuration
 Contents

Chapter 1. Introduction
1.1 Overview .......................................................................................................... 1-1
General ...................................................................................................................1-1
Versions...................................................................................................................1-1
Application ..............................................................................................................1-1
Features...................................................................................................................1-2
1.2 Physical Description .......................................................................................... 1-3
1.3 Functional Description ...................................................................................... 1-4
Data Channel Characteristics ...................................................................................1-4
HDSL Subsystem Characteristics ..............................................................................1-4
Management ...........................................................................................................1-5
System Timing .........................................................................................................1-6
1.4 Technical Specifications .................................................................................... 1-7

Chapter 2. Installation and Setup

2.1 Site Requirements and Prerequisites.................................................................. 2-1
2.2 Package Contents.............................................................................................. 2-2
2.3 Installation and Setup........................................................................................ 2-2
Setting the Jumpers and Switches .............................................................................2-2
Connecting the Interfaces ........................................................................................2-6
Connecting the Power .............................................................................................2-8

Chapter 3. Front Panel Operating Instructions

3.1 Front Panel Controls, Connectors and Indicators ............................................... 3-1
3.2 Control of HCD-4 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....................................................................................... 3-5
Turning HCD-4 On..................................................................................................3-6
Checking the Current Operating Configuration.........................................................3-7
Normal Indications ..................................................................................................3-7
Monitoring HCD-4 Performance ..............................................................................3-8
Turning HCD-4 Off..................................................................................................3-8
3.4 Local Configuration Setup Procedure ................................................................ 3-8
General ...................................................................................................................3-8
Password Protection.................................................................................................3-9
General Configuration Procedure.............................................................................3-9
3.5 Front Panel Configuration Commands............................................................. 3-10
Data Channel Parameters ......................................................................................3-10
Control Port Parameters .........................................................................................3-10
System Parameters.................................................................................................3-10

HCD-4 Installation and Operation Manual i

Table of Contents

Chapter 4. Control from the Supervisory Port

4.1 Hardware Requirements for Supervisory Port Management............................... 4-1
Terminal Characteristics ...........................................................................................4-1
Control Port Interface Characteristics........................................................................4-1
Modems ..................................................................................................................4-2
Control Port Handshaking Protocol ..........................................................................4-2
4.2 Preliminary Settings for Initial Configuration Session .......................................... 4-4
Configuring the Supervisory Terminal .......................................................................4-4
Configuring HCD-4 for Supervisory Port Management..............................................4-4
4.3 Running a Supervision Terminal Management Session....................................... 4-5
Starting a Control Session.........................................................................................4-5
Entering Commands.................................................................................................4-5
Troubleshooting Command Entry .............................................................................4-7
Ending a Control Session..........................................................................................4-7
4.4 HCD-4 Command Language............................................................................. 4-8
Command Options ..................................................................................................4-8
Index of Commands ................................................................................................4-8
4.5 Configuring HCD-4 with the Supervision Terminal .......................................... 4-10
Terminal Type .......................................................................................................4-10
Control Port Parameters .........................................................................................4-11
System Parameters.................................................................................................4-11
Data Channel Parameters ......................................................................................4-11
Node Number .......................................................................................................4-11
Logical Name ........................................................................................................4-11
Reset .....................................................................................................................4-11

Chapter 5. Troubleshooting and Diagnostics

5.1 General............................................................................................................. 5-1
5.2 Error Detection ................................................................................................. 5-1
Power-Up Self-Test ..................................................................................................5-1
Front-Panel LEDs .....................................................................................................5-1
Alarms .....................................................................................................................5-2
Alarm Relay .............................................................................................................5-2
Working with Alarm Buffer.......................................................................................5-7
Configuration Error Messages ...................................................................................5-8
General Troubleshooting..........................................................................................5-9
5.3 Performance Diagnostics Data......................................................................... 5-10
General .................................................................................................................5-10
Displaying the Performance Data on the Front Panel LCD ......................................5-10
Displaying the Performance Data on a Control Terminal.........................................5-11
Performance Monitoring Parameters ......................................................................5-11
5.4 Diagnostic Tests .............................................................................................. 5-14
Operating Loopbacks from the Front Panel ............................................................5-14
Activating the Diagnostic Loops from a Control Terminal ........................................5-15
Loopback Test Descriptions ...................................................................................5-15

ii HCD-4 Installation and Operation Manual

 Table of Contents

Appendix A. Connector Wiring

Appendix B. IR-ETH Interface Module
Appendix C. IR-IP Interface Module
Appendix D. IR-ETH/QH Interface Module
Appendix E. Installing New Software Releases
Appendix F. Operating Environment
Appendix G. Parameters and Terminal Commands

HCD-4 Installation and Operation Manual iii

Table of Contents

List of Figures
1-1. Typical HCD-4 Application ....................................................................................... 1-1
1-2. HCD-4, 3D View....................................................................................................... 1-3
1-3. Flow of Timing Signals through HCD-4 System in the Internal Timing Mode.............. 1-6

2-1. Identification of Boards, Jumpers and Switches.......................................................... 2-4

2-2. Setup DIP Switch....................................................................................................... 2-5
2-3. HCD-4 Rear Panel (AC-Powered Unit) ...................................................................... 2-6

3-1. HCD-4 Front Panel ................................................................................................... 3-1

5-1. LP L LINE Loopback ................................................................................................ 5-16

5-2. LP L CH Loopback .................................................................................................. 5-16
5-3. LP R CH Loopback ................................................................................................. 5-17
5-4. LP R R CH Loopback............................................................................................... 5-17

List of Tables
2-1. Main Board Jumper and Switch Settings .................................................................... 2-4
2-2. Setup DIP Switch Settings.......................................................................................... 2-5

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

3-2. Front Panel Parameters.............................................................................................. 3-3

4-1. Control Port Handshaking Protocol............................................................................ 4-2

4-2. Control Port Parameters for Supervisory Port Management ........................................ 4-4
4-3. Command Options.................................................................................................... 4-8
4-4. HCD-4 Command Set Index ..................................................................................... 4-8

5-1. HCD-4 Alarm Buffer Messages .................................................................................. 5-3

5-2. Configuration Error Messages..................................................................................... 5-8
5-3. Troubleshooting Chart ............................................................................................... 5-9
5-4. Performance Monitoring Parameters........................................................................ 5-12
5-5. Loopback Tests........................................................................................................ 5-15

iv HCD-4 Installation and Operation Manual

 Chapter 1
Introduction

1.1 Overview

General
HCD-4 is a standalone HDSL NTU (Network Terminal Unit) / LTU (Line Terminal
Unit) that provides the user with a synchronous data channel operating at up to
4096 kbps.
HCD-4 includes extensive HDSL collection capabilities, as well as enhanced
testing and diagnostics features. For more information, see Features on page 1-2.
Versions
HCD-4 can be ordered in several versions, which differ in the type of user ports.
The data channel can be ordered with synchronous data port (RS-530, V.35, X.21)
or Ethernet interface module (IR-ETH, IR-IP, or IR-ETH/QH).

Power Supply
HCD-4 is available with two power supply options:
• 100 to 240 VAC, 47 to 63 Hz
• -48 VDC.

Note In this manual, the generic term HCD-4 is used when the information is applicable
to all HCD-4 versions. Information applicable to a specific version is explicitly
identified.

Application
Figure 1-1 shows a typical application for HCD-4. In this application, HCD-4 is
used to connect the LANs over an HDSL line.

HDSL

HCD-4 HCD-4

Figure 1-1. Typical HCD-4 Application

Overview 1-1
Chapter 1 Introduction HCD-4 Installation and Operation Manual

Features
Automatic 2048 kbps / 4096 kbps Line Switching
If HCD-4 is working at the data rate of up to 2048 kbps, it will continue working at
the same rate even if one of its HDSL lines is down. In this case the data is
transmitted over the HDSL line A, unless it is out of sync.
If HCD-4 is working at the data rate of 4096 kbps and one of the lines fails, it will
continue working at half of its bit rate on the second line. Once the line recovers,
HCD-4 automatically switches back to working at 4096 kbps.

Detection of Inverted Lines

HCD-4 can detect the HDSL lines inversion. Once this condition is detected, the
modem continues to operate normally over the inverted lines.

LEDs and Alarms

HCD-4 responds to any alarm detected during its operation by displaying an alarm
message. HCD-4 stores alarm messages in a buffer that can hold up to 100 alarm
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. The
user can mask some or all alarms in order to prevent unwanted alarm messages.
HCD-4 can provide an alarm indication by means of an alarm relay (dry contacts),
which enables remote signaling of alarm conditions when HCD-4 is located far
from the personnel in charge of its operation.
In addition to the alarm buffer, front-panel LED indicators display in real time the
status of the data channel and the HDSL line, and alert when test loops are present
in the system. The status of the LAN connected to the IR-ETH, IR-IP or IR-ETH/QH
module is indicated by the module LEDs located on the HCD-4 rear panel.

Test and Diagnostics Capabilities

HCD-4 has comprehensive diagnostics capabilities, which include the following
loopbacks:
• Local loopback on the data channel of the local HCD-4
• Local loopback on the HDSL lines
• Remote loopback on the data channel of the local HCD-4
• Remote loopback on the data channel of the remote unit.

The HCD-4 Ethernet modules (IR-ETH, IR-IP or IR-ETH/QH) do not support

loopback activation.
Maintenance is further enhanced by advanced power-up self-test capabilities. The
user can also read the diagnostic data of the remote unit through the HDSL link.

Statistics Collection
HCD-4 stores performance statistics for the HDSL line in compliance with the
requirements of ITU-T Rec. G.826.

1-2 Overview
HCD-4 Installation and Operation Manual Chapter 1 Introduction

1.2 Physical Description

HCD-4 is a compact unit, intended for installation on desktops or shelves. The unit
height is 1.75 inch.
An optional rack-mount adapter kit enables the installation of one or two HCD-4
units in a 19-inch rack.
Figure 1-2 shows a 3D view of HCD-4.

TD
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H
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A O
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HC
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Figure 1-2. HCD-4, 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 together with three buttons are used to display status (alarm) messages,
diagnostics and performance monitoring data, test status and configuration
parameters of HCD-4. You can also use the LCD and buttons to configure the unit.
For details, refer to Chapter 3 and Chapter 5.
The rear panel of the unit allows access to the setup DIP switch, and to the
interface, alarm relay and power connections. For details, refer to Chapter 2,
Installation and Setup. For versions with the IR-ETH, IR-IP or IR-ETH/QH interface
modules, the module rear-panel LEDs provide real-time indications related to the
operation and status of the LAN. For detailed information on the IR-ETH, IR-IP or
IR-ETH/QH interfaces, refer to Appendix B, Appendix C, or Appendix D,
respectively.

Physical Description 1-3

Chapter 1 Introduction HCD-4 Installation and Operation Manual

1.3 Functional Description

Data Channel Characteristics

HCD-4 data ports support user-selectable transmission rates. The supported data
rates are integer multiples of 64 kbps (n × 64 kbps, where n is in the range of 1 to
32, corresponding to rates in the range of 64 kbps to 2048 kbps), and 4096 kbps.
HCD-4 supports the following types of data port interfaces:
• Synchronous: RS-530, V.35, X.21
• Ethernet:
IR-ETH – Ethernet bridge
IR-IP – IP router
IR-ETH/QH – Ethernet/Fast Ethernet bridge with VLAN support.

The HCD-4 data port supports the following control lines:

• RTS – input from the locally connected user's equipment
• CTS – the user can permanently set the CTS line in the active state, or can
make the CTS line follow the RTS line.
• DSR – the DSR line is always active when the HCD-4 is powered, except
when a remote channel test loopback is activated.
• DCD – the DCD line is active when the HCD-4 main link interface is
synchronized.

HDSL Subsystem Characteristics

The HCD-4 uses two HDSL subsystems, each of them provides full-duplex
transmission over a 2-wire line. The line code of the HDSL line is 2B1Q at a rate of
1160 kbaud (equivalent to a data transfer rate of 2320 kbps).
Using advanced equalization, adaptive filtering, and echo cancellation techniques,
HCD-4 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, HCD-4 enables the transmission of multiple
HDSL signals in the same physical cable without requiring pair selection.
HCD-4 can operate on unloaded AWG-22, AWG-24, and AWG-26 twisted-wire
pairs, and other similar pairs. Up to two bridged taps, having a length of up to
500m, are tolerated. HCD-4 achieves typical ranges of 3.0 km (1.9 miles) on
AWG-24 (0.5 mm) pairs, and up to 2.4 km (1.6 miles) on AWG-26 (0.4 mm) pairs.
The HDSL line interface terminates in an RJ-45 eight-pin female connector.
HCD-4 provides an Embedded Operations Channel (EOC) within the HDSL data
streams, which enables end-to-end system management and supervision.

1-4 Functional Description

HCD-4 Installation and Operation Manual Chapter 1 Introduction

The HDSL subsystem operates in a master-slave mode.

The master unit, called Line Termination Unit (LTU), controls the system start-up
procedure, provides the timing reference for HDSL line transmission, and manages
communication on the EOC.
The slave unit, located at the remote end of the link, is called Network Termination
Unit (NTU).
HCD-4 supports both central (LTU) and remote (NTU) operating modes; the
actual operating mode (LTU or NTU) is user-selectable.
Management

Local Control
HCD-4 is designed for unattended operation. HCD-4 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
HCD-4 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,
HCD-4 displays the configuration error number, which helps the operator take the
correct action.

Remote Management
In addition to front panel control, HCD-4 supports management from a remote
location. The remote management capabilities can be used to configure the
HCD-4 parameters and display status (alarm) messages, diagnostics information,
performance monitoring data, and test status.
These functions are performed through a serial RS-232 port that enables serial
communication with a supervisory terminal.
Any dumb ASCII terminal connected to the CONTROL DCE port of HCD-4 (or a
PC running a terminal emulation program), controlled by the program stored in
HCD-4, can be used as a supervisory terminal.
The supervisory terminal can communicate with HCD-4 using either point-to-point
or polled (multidrop) communication. For polling purposes, each HCD-4 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.

Control of Remote Unit from Central Unit

As described above, the operation of the HCD-4 system is basically asymmetrical,
i.e., the HDSL subsystem inherently operates in a central (master)/remote (slave)
mode. HCD-4 takes advantage of this characteristic to expedite the configuration,
management and supervision tasks related to the remote unit.

Functional Description 1-5

Chapter 1 Introduction HCD-4 Installation and Operation Manual

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 HCD-4 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 remote management, the user of the local unit can read and clear the alarm
messages and performance parameters of the unit at the remote site through the
EOC.
System Timing
HCD-4 enables 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 timing and the data rate provided to the customer equipment by the remote
unit are locked to the timing and data rate received by the central unit.

HCD-4 Configured as Central Unit (LTU)

The HCD-4 unit configured as LTU operates with internal timing mode. In this
mode, the HCD-4 system timing is determined by the clock signal generated by an
internal crystal oscillator. Figure 1-3 shows the flow of timing signals through the
HCD-4 system in the internal timing mode.

Central HCD-4 Remote HCD-4

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 1-3. Flow of Timing Signals through HCD-4 System in the Internal Timing Mode

HCD-4 Configured as Remote Unit (NTU)

The HCD-4 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, HCD-4
automatically switches to the clock signal recovered from line B.

1-6 Functional Description

HCD-4 Installation and Operation Manual Chapter 1 Introduction

1.4 Technical Specifications

HDSL Interface Compliance ETSI TR-152
Signal Format Dual duplex, 2B1Q line coding
Line Baud Rate 1160 kbaud (equivalent to 2320 kbps)
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 31 dB max at 150 kHz (584 kbaud)
Range • 3.0 km (1.9 miles) for 24 AWG (0.5 mm)
• 2.4 km (1.6 miles) for 26 AWG (0.4 mm)
Return Loss 16 dB minimum, 80 kHz to 485 kHz @ 135Ω
Differential Line Maximum 50 µs at 150 kHz
Delay
Equalizer Automatic adaptive equalizer
Connector RJ-45
Data Channel Data Rate Multiples of 64 kbps, up to 2.048 Mbps, 4.096 Mbps
Interface
Interface • RS-530: 25-pin D-type female
Connectors • V.35: 34-pin male (via adapter cable)
• X.21: 15-pin D-type female (via adapter cable)
• IR-ETH: RJ-45
• IR-IP: RJ-45
• IR-ETH/QH: RJ-45
Front Panel LCD 2 rows × 16 characters
Controls
Buttons CURSOR, SCROLL, ENTER
Indicators Data Channel TD, RD, Ethernet rear-panel LEDs (IR-ETH, IR-IP, and
IR-ETH/QH)
HDSL Lines HDSL LOS - LINE A, HDSL LOS - LINE B
Status TST, ALM

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Chapter 1 Introduction HCD-4 Installation and Operation Manual

Diagnostics Loopbacks • HDSL main link local loopback, towards the data
channel of the unit configured as central
• Channel loopback on the local unit towards the DTE
connected to the data channel
• Channel loopback on the local unit towards the DTE
connected to the data channel of the remote unit
• Channel loopback on the remote unit towards the
DTE connected to the data channel of the local unit
HDSL Performance Per ITU G.826
Monitoring
Timing HDSL Link Receive Timing: Locked to the recovered HDSL receive
signal of the central unit
Transmit Timing: Internal timing, derived from a local
±50 ppm oscillator (user-selectable)
Supervisory Interface V.24/RS-232, asynchronous DCE interface for direct
Port connection of control terminal or dial-up modem
Data Rate 9.6 kbps
Word Format • One start bit
• 7 or 8 data bits
• Parity: none, odd, or even
• One stop bit
Connector 9-pin D-type, female
Alarm Relay Function Floating pair of NO and NC contacts, connected by
jumpers to the ALM RLY port
Contact Ratings Open-circuit: maximum 60 VDC
Short-circuit: maximum 0.25A
Physical Depth 243 mm / 9.5 in
Width 215 mm / 8.5 in
Height 43.7 mm / 1.75 in (1 U)
Weight 1.5 kg / 3.5 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

1-8 Technical Specifications

 Chapter 2
Installation and Setup
HCD-4 is delivered completely assembled. It is designed for installation as a
desktop unit or for mounting in a 19-inch rack.
This chapter describes installation procedures for the standalone HCD-4 device.
After installing the unit:
• Refer to Chapter 3 for detailed system configuration information and
procedures for using the front panel controls.
• Refer to Chapter 4 for detailed system configuration procedures using an ASCII
terminal connected to the HCD-4 control port.

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.

Warning Always observe standard safety precautions during installation, operation and
maintenance of this product.

2.1 Site Requirements and Prerequisites

AC-powered HCD-4 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 HCD-4 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 the HCD-4 should be 0 to 50°C (32 to

122°F), at a relative humidity of up to 90%, non-condensing.

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Chapter 2 Installation and Setup HCD-4 Installation and Operation Manual

2.2 Package Contents

The HCD-4 package includes the following items:
• HCD-4 unit
• Last Mile Access and Intelligent Modems CD
• AC power cord or DC power supply connector kit
• Interface adapter cable:
CBL-HS2V1 for modems with V.35 interface
CBL-HS2X1 for modems with X.21 interface.

2.3 Installation and Setup

HCD-4 is a standalone device intended for tabletop or bench installation. It is
delivered completely assembled. No provision is made for bolting the unit on the
tabletop
➤ To install HCD-4:
1. Determine the required configuration of HCD-4, according to your
application, and set the jumpers and switches accordingly.
2. Connect the HDSL lines, the data channel and the control port, if necessary.
3. Connect power to the unit.
Setting the Jumpers and Switches
This section provides information on the functions of the HCD-4 jumpers and
switches, and gives step-by-step instructions for performing the internal settings.
The default settings are also listed.

Locations of Jumpers and Switches

HCD-4 includes two printed circuit boards (PCBs): the main board and a DTE
interface board.
The Main Board contains the common signal processing circuits and the interfaces
to the main link (HDSL). A switch unit (S3) and a jumper (JP1) are provided for
user settings. The board contains additional switches and jumpers, which are
factory-set and must not be changed by the user.
The Data Channel Interface Board provides the connections for the data channel.
The board does not contain any user-set jumpers or switches (except for the
IR-ETH, IR-IP and IR-ETH/QH boards, refer Appendix B, Appendix C, or
Appendix D, respectively).
Additionally, HCD-4 features 4-section Setup DIP switch, located on the unit's rear
panel.

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HCD-4 Installation and Operation Manual Chapter 2 Installation and Setup

Opening the Case

To reach the internal jumper and switch of HCD-4, it is necessary to open its case.

Access to the inside of the HCD-4 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 HCD-4 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.
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 HCD-4 contains components sensitive to electrostatic discharge (ESD). To prevent

ESD damage, avoid touching the internal components. Before moving jumpers,
touch the HCD-4 frame.

➤ To open the HCD-4 case:

1. Disconnect all the cables connected to HCD-4.
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. After the four screws are released, remove the HCD-4 top cover by pulling it
straight up.

Setting the Main Board Internal Jumper and Switch

The internal jumper and switch located on the HCD-4 main board are identified
in Figure 2-1. The jumper and switch, and their settings are described in Table 2-1.

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Chapter 2 Installation and Setup HCD-4 Installation and Operation Manual

RJ-45
Connector
Data Channel
Interface Board JP 1

OFF
ON
FGND/GND

OFF ON
1
Switch S3
2
S3

Figure 2-1. Identification of Boards, Jumpers and Switches

Table 2-1. Main Board Jumper and Switch Settings

Jumper/Switch Description Values Factory

Setting
FGND/GND Jumper, Used to control the connection ON – Ground is shorted to the ON
JP1 between the internal signal frame ground.
ground and the frame ground.
OFF – Ground is not shorted to
the frame ground.
Switch S3 Section 1 of this switch is used for For instructions on setting this OFF
cold (local) installation of new switch during a cold software
software. installation, refer to Appendix E.

Setting the FGND/GND jumper 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.
Warning

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HCD-4 Installation and Operation Manual Chapter 2 Installation and Setup

Setting the Rear Panel DIP Switch

The setup DIP switch is located on the HCD-4 rear panel, as shown in Figure 2-2.
Table 2-2 describes the DIP switch settings.

SETUP HDSL
ON
1234

PASSWD CENTRAL
DEF SP DB INIT

Figure 2-2. Setup DIP Switch

Table 2-2. Setup DIP Switch Settings

Jumper/Switch Description Values Factory

Setting
Setup DIP Switch Allows you to enforce the default password and node number (section 1), reload the
desired group of default parameters (sections 2 and 3), and select the function of the
HCD-4 unit as central or remote (section 4). Any changes in switch section positions
must be performed on a unit not connected to power.
Section 1 – PASSWD To prevent unauthorized personnel ON – HCD-4 uses the default
from using the HCD-4 supervision password.
program, you can use password
OFF – HCD-4 uses the OFF
protection with a password
user-selected password.
consisting of up to eight
alphanumeric characters. HCD-4 is
delivered with a default password,
HCD4, but normally the password is
selected by the user.
Section 2 – DEF SP This section selects the source of the ON – HCD-4 uses the default
control port parameters. SP parameters stored in
its program FLASH.
OFF – HCD-4 uses the OFF
parameters stored in
the database.
Note: You can make HCD-4 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 HCD-4 off, reset the appropriate
section to OFF and turn the unit on again; HCD-4 will use the user-selected parameters.

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Chapter 2 Installation and Setup HCD-4 Installation and Operation Manual

Table 2-2. Setup DIP Switch Settings (Cont.)

Jumper/Switch Description Values Factory

Setting
Section 3 – DB INIT This section selects the source of the ON – HCD-4 uses the default
database configuration parameters. parameters stored in its
program EPROM for
reloading of the
database.
OFF
OFF – HCD-4 uses the
parameters stored in
the database.
Note: HCD-4 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 HCD-4 with the default parameters.
Section 4 – CENTRAL Used to select the function of the ON – HCD-4 operates as a
(Central/Remote) HCD-4 unit. remote unit (NTU).
OFF – HCD-4 operates as a OFF
central unit (LTU).

Reinstalling the Cover

After completing the internal settings, reinstall the HCD-4 top cover.
➤ To reinstall the HCD-4 cover:
1. Position the lower half of the HCD-4 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).
2. Identify the front and the rear of the top cover, and position the cover on the
lower half of the HCD-4, 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.
Connecting the Interfaces
Figure 2-3 shows a typical rear panel of a standard HCD-4 unit and identifies
connector locations for the AC version.

Figure 2-3. HCD-4 Rear Panel (AC-Powered Unit)

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HCD-4 Installation and Operation Manual Chapter 2 Installation and Setup

Connecting the Data Port

When HCD-4 is ordered with the RS-530, V.35 or X.21interface, its data port is
terminated in a 25-pin D-type female connector. The units with IR-ETH, IR-IP and
IR-ETH/QH interfaces arrive with the RJ-45 connector. For description of these
Ethernet interface modules, refer to Appendix B, Appendix C, or Appendix D.
➤ To connect your equipment to the data ports:
• To connect equipment with RS-530 interface to a data port, use a 25-pin
female connector.
• To connect equipment with V.35 or X.21 interface to a data port, use the
adapter cable supplied with the unit. First connect the adapter cable to the
channel connector, then connect the data cable to the adapter connector.
• To connect equipment with the Ethernet interface to a data port, use the RJ-45
connector.

The HCD-4 unit should be delivered with the appropriate cables. You can also
prepare these cables yourself in accordance with the port connector wiring
information given in Appendix A.

Connecting the HDSL Lines

To connect the remote equipment (HDSL lines) to HCD-4, connect the cable to
the RJ-45 connector designated HDSL. Appendix A provides the pin allocation for
this connector.

Connecting the Alarm Relay Port

The alarm relay contacts are available in a special RJ-11, 4-pin connector,
designated ALM RLY. To connect HCD-4 to alarm equipment, you will have to
prepare a special cable. Appendix A provides the pin allocation for this cable.

Connecting the Control Port

If you are using the supervisory terminal, connect a cable prepared in accordance
with instructions in Appendix A, between the control port connector, designated
CONTROL DCE and the supervisory terminal. If the supervisory terminal is
connected via modems, use a cross cable.
Note The various interface cables should be shielded, in order to comply with FCC rules.
HCD-4 and its data interfaces will work well even if the cables are not shielded, but
some radio interference may occur.

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Connecting the Power

To connect HCD-4 to the power source, refer to the appropriate section below,
depending on your version of the unit (AC or DC).

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 HCD-4 through the 1.5m (5 ft) standard
power cable terminated by a standard 3-prong plug (see Figure 2-3). The cable is
provided with the unit.
➤ To connect AC power:
1. Check that the ON/OFF switch on the HCD-4 rear panel is set to OFF.
2. Connect the power cable first to the connector on the HCD-4 rear panel, and
then to the mains outlet.

Connecting the DC Power

• Refer to DC Power Supply Connection Supplement.

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 Chapter 3
Front Panel Operating
Instructions
This chapter contains detailed instructions for operating HCD-4 from the front
panel. The information presented in this chapter includes:
• HCD-4 front panel – Section 3.1
• General description of HCD-4 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
• HCD-4 local configuration setup – Section 3.4

For instructions on remote operation of HCD-4 from a control terminal, refer to

Chapter 4.

3.1 Front Panel Controls, Connectors and Indicators

Figure 3-1 shows the front panel of HCD-4. Table 3-1 lists the functions of the
HCD-4 controls, connectors and indicators, located on the HCD-4 front panel.

HDSL LOS CONTROL

TD RD LINE A LINE B

ALM TST DCE

CURSOR SCROLL ENTER

Figure 3-1. HCD-4 Front Panel

Table 3-1. 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 LINE A LED indicator ON – The HDSL line A (line 1) circuits lose synchronization to the
incoming signal
HDSL LOS LINE B LED indicator ON – The HDSL line B (line 2) circuits lose synchronization to the
incoming signal

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Chapter 3 Front Panel Operating Instructions HCD-4 Installation and Operation Manual

Table 3-1. Controls, Connectors and Indicators (Cont.)

Name Type Function

TST LED indicator ON – A test is active
ALM LED indicator ON – An ON-state alarm is stored in the HCD-4 alarm buffer
Note: For explanation of the ON-state Alarm term see Section 5.2, Status Indications and Alarms, in
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 HCD-4 operation
CONTROL DCE Connector Connection to control terminal

3.2 Control of HCD-4 Operation

General
The HCD-4 operating mode is determined by a set of parameters stored in an
internal non-volatile memory. To select these parameters, you can use the HCD-4
front panel buttons or a control terminal.
After the operating parameters have been loaded (this process is called
configuration setup), HCD-4 no longer requires operator attendance.
The configuration selected by the user and stored in the HCD-4’s memory is not
affected when power is turned off. Upon turn-on, HCD-4 checks the validity of
the stored configuration data, and after the self-test takes the last selected
configuration (unless you have changed the default setting of the Setup DIP switch,
section 3, from OFF to ON, as described in Chapter 2, Installation and Setup). If
the configuration does not require modification, HCD-4 is ready for operation
immediately after power is applied. However, if the configuration data is
corrupted, HCD-4 loads a default configuration instead. The default configuration,
prepared by the manufacturer, is stored in the program FLASH.
All operations are performed using an interactive, menu-driven interface,
controlled by the LCD and three buttons. HCD-4 guides you in the execution of
the required task by means of messages, and checks your inputs. Moreover,
HCD-4 will suggest only those parameter values, which are available on your
HCD-4 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), HCD-4 rejects the erroneous selection
and displays an error message that identifies the error.
For detailed operating instructions, refer to Section 3.3, Operating Instructions,
and Section 3.4, Local Configuration Setup Procedure.

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HCD-4 Installation and Operation Manual Chapter 3 Front Panel Operating Instructions

Organization of the LCD

The HCD-4 display has two rows:
• The upper row shows the header, which can be one of the following:
ALARM BUFFER
SYSTEM PARAMETER
TEST OPTION
HDSL DIAG
SP PARAMETERS
PORT PARAM
• The lower row displays the following information:
Parameter name and value
Status messages
Test or loopback name and status
Error messages
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
SYSTEM PARAMETER CLK MASTER Only for HCD-4 configured as central
HCD TYPE
CONFIG REM Only for HCD-4 configured as central
REM TYPE
TEST OPTION: ML LOCAL LINE
TEST OPTION: CH LOCAL CH
REM CH
REM REM CH
TEST OPTION: OFF
HDSL DIAG: LINE1 CURR ES ... Refer to Chapter 5
L. TERM INT
SP PARAMETERS DATA
PARITY
INTERFACE
AUX DEV
PORT PARAM: CH SPEED
CTS
ETHER Only when data channel has Ethernet interface
BRIDGING Only when data channel has Ethernet interface

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Chapter 3 Front Panel Operating Instructions HCD-4 Installation and Operation Manual

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.

In addition to the parameters configured from the front panel, there are
parameters that can be controlled only from the control terminal. These are
described in Chapter 4, Control from the Supervisory Port.

Status Messages (Alarms)

When HCD-4 is not being configured and HDSL DIAG is not displayed, the
header ALARM BUFFER appears. If the alarm buffer contains status messages
(ON-state alarms), the LCD second row displays “SCROLL CLEAR” and the ALM
indicator is lit. Otherwise, the second row of the LCD displays “EMPTY” and the
ALM LED is off.
For the definition of ON-state and ON-type alarms, a list of alarms and instructions
on how to work with alarms, refer to Alarms, in Chapter 5.

Diagnostics and Performance Monitoring Data

HCD-4 can display the HDSL line performance parameters.
The diagnostics data appear 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 HCD-4 include:
• Local and remote loopbacks on the data channel of the local HCD-4
• Local loopback on the HDSL lines of the HCD-4 unit configured as central
• Remote loopback on the data channel of the remote unit

The test options appear under the header TEST OPTION. For a description of the
test functions and instructions how to operate them, refer to Diagnostic Tests, in
Chapter 5.

Configuration Parameters
HCD-4 configuration parameters are divided into the following groups:
• System Parameters (SYSTEM PARAMETER)
• Channel Parameters (PORT PARAM: CH)
• Control Port Parameters (SP PARAMETERS)

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HCD-4 Installation and Operation Manual Chapter 3 Front Panel Operating Instructions

Appendix G describes each group of parameters and provides practical

configuration guidelines for individual parameters and parameter groups where
necessary. For instructions on viewing these parameters, refer to Section 3.3,
Operating Instructions. For instructions on changing these parameters, refer to
Section 3.4, Local Configuration Setup Procedure. For instructions on performing
basic HCD-4 configuration from the front panel, refer to Section 3.5, Front Panel
Configuration.
Using Front-Panel Buttons
The HCD-4 front panel contains three buttons designated CURSOR, SCROLL and
ENTER. These buttons control the LCD display and let you view and change
HCD-4 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 HCD-4 displays a
CONFIG ERROR message with a two-digit code in the second display
row. After a short time, the error message disappears and HCD-4
returns to the original display. Refer to Configuration Error Messages
in Chapter5 for a list of error codes and how to correct the errors.

Additional Functions of ENTER

The ENTER key has two additional functions:
• When the LCD displays the ALARM BUFFER screen, the ENTER key can be
used to delete all the alarms in the buffer.
• When the LCD displays the HDSL DIAG screen, the ENTER key can be used
to reset 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 HCD-4 on
• Checking HCD-4 configuration
• Normal HCD-4 operating indications
• Monitoring HCD-4 performance
• Turning HCD-4 off.
Refer to Section 3.4 for local configuration setup instructions.

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Chapter 3 Front Panel Operating Instructions HCD-4 Installation and Operation Manual

Turning HCD-4 On
To turn HCD-4 on, set the rear-panel POWER switch to ON. Upon turn-on,
HCD-4 decompresses the program from FLASH (during this operation the TST LED
blinks), and then performs a self-test; observe the front-panel indications.
During the self-test, HCD-4 displays its current software revision:

HCD-4 REV 1.0

SELF TEST

After successfully completing the self-test procedure, HCD-4 switches to the

default ALARM BUFFER screen. If HCD-4 fails the self-test, its LCD will display a
description of the fault. In this case, HCD-4 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

If the self-test reveals that configuration data selected by the user and stored in the
HCD-4 database is corrupted, HCD-4 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 the unit off.
2. Set section 3 (DB INIT) of the HCD-4 Setup DIP switch to ON. Refer to Setting
the Jumpers and Switches, in Chapter 2, for instructions.
3. Turn HCD-4 on for a short time (until the power-up self-test is performed).
4. Return section 3 of the Setup Switch to OFF. Now HCD-4 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 HCD-4 configuration as explained in the following section. If
the configuration does not require modification, HCD-4 is ready for operation
immediately after the self-test is completed. For information how to change the
configuration, refer to Section 3.4.

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HCD-4 Installation and Operation Manual Chapter 3 Front Panel Operating Instructions

Checking the Current Operating Configuration

Before performing the procedure below, review Appendix G, which explains the
HCD-4 configuration parameters.
➤ To check the current operation configuration:
During the following procedure, do not press the ENTER button, to prevent
Note
accidental change of parameters.
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 HCD-4 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 left-hand field in the top row.
6. Bring to display the next group of configuration parameters (the control port
parameters); the top row displays SP PARAMETERS. The second row shows
the first parameter of the control port parameters, DATA, 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 display row shows the current value of the next
parameter. Continue until DATA appears again.
9. Bring the CURSOR to the left-hand field in the top row.
10. Bring to display the next group of configuration parameters (the channel
parameters); the first row displays PORT PARAM: CH. The second row shows
the first parameter of the port parameters, SPEED, and its current value.
11. Bring the cursor to the left-hand field in the second row.
12. Scroll to see the other parameters of this group; each time you press the
SCROLL button, the second display row shows the current value of the next
parameter. Continue until SPEED appears again.
Normal Indications
LCD
If no ON-state alarm is stored in the alarm buffer (ALM indicator off), HCD-4
continues to display the last user-selected display. If there are ON-state alarms
stored in the alarm buffer (ALM indicator lights) and no HDSL DIAG screen is
displayed, the top row displays the message ALARM BUFFER.

Note For an explanation of the ON-state Alarm term, refer to Status Indications and
Alarms, in Chapter 5.

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Chapter 3 Front Panel Operating Instructions HCD-4 Installation and Operation Manual

In addition, HCD-4 automatically aborts the current activity (except HDSL DIAG)
and redisplays 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, HCD-4 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
During normal operation the RD and TD LEDs are ON to indicate data transfer
over the transmit and receive lines of the data channel. The rest of the front panel
LEDs are OFF.
• 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 HCD-4 alarm
buffer.

Monitoring HCD-4 Performance

HCD-4 continuously measures diagnostics performance data. The diagnostics data
is available under HDSL DIAG.
For an explanation of the measured parameters, refer to Performance Diagnostics
Data in Chapter 5.
Turning HCD-4 Off
➤ To turn HCD-4 off:
• Set the HCD-4 rear power switch to OFF.

3.4 Local Configuration Setup Procedure

General
Before starting any configuration action:
• Review the relevant configuration parameters listed in Appendix G.
• If HCD-4 includes IR-ETH, IR-IP or IR-ETH/QH module, review a list of the
required parameters from the network subscription data, and/or from your
system administrator.

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HCD-4 Installation and Operation Manual Chapter 3 Front Panel Operating Instructions

Password Protection
HCD-4 has password protection designed to avoid undesirable modification of its
parameters. You will be able to configure HCD-4 from the front panel only if its
password protection is disabled. Otherwise, you can use the HCD-4 front panel to
display the current parameter values, but cannot modify them. If you try to modify
a parameter or perform a test function from the front panel while password
protection is enabled, HCD-4 will display CONFIG ERROR 03.
If you have access to an ASCII control terminal, you can use the DEF SP command
to enable or disable the password protection (refer to Chapter 4, Control from the
Supervisory Port, for detailed instructions).
If the terminal is not available, you must set section 3 (DB INIT) of the HCD-4
Setup DIP switch to ON for a short time. This disables password protection, as
explained in Setting the Jumpers and Switches in Chapter 2.
Note This action will delete all the current parameters on your HCD-4 and make it use
the default parameter values. If your unit is configured as central, these parameters
will be also automatically downloaded to the remote unit. That is to say, now you
will need to reconfigure both the central and the remote unit. The only case you
would not have to do this is when your unit is configured as remote and you want
its parameters to be automatically downloaded from the unit configured as central
(its CONFIG REM parameter set at YES).

General Configuration Procedure

Before starting the configuration procedure, make sure that all the user-initiated
loopbacks are disconnected. To disconnect the loopbacks, select OFF in the TEST
OPTION field (refer to Diagnostic Tests in Chapter 5).
If your configuration attempt is invalid, HCD-4 displays a CONFIG ERROR XY
message (the code XY identifying the error) and then returns to its normal display.
For explanation of the configuration error messages, refer to Configuration Error
Messages, in Chapter 5.
➤ To configure the unit:
1. Bring the CURSOR to the top row (if not already there).
2. Scroll to display the desired group of parameters in the top row; the second
row shows the first parameter in the selected group and its current value.
3. Bring the cursor to the left-hand field (parameter name) in the second row,
then scroll to display the desired parameter in the selected group.
4. Bring the cursor to the right-hand field (the parameter value) in the second
row.
5. Scroll to set the required value for the displayed parameter; the second row
shows the available values.
6. When the desired parameter value is displayed, confirm the new parameter
value; the second row displays shortly CONFIG ENTER, then returns to the
normal display.
7. Repeat steps 3 to 6 until values are assigned to all the parameters in the group;
the second row displays the current selection.

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Chapter 3 Front Panel Operating Instructions HCD-4 Installation and Operation Manual

Note You do not have to press ENTER each time you change a parameter within a group.
However, once you have finished modifying the parameters in a certain group
(system or channel), you must press ENTER to confirm the selection. If you change
parameter values, but return the cursor to the top row and scroll to another group
without pressing ENTER, the changes are discarded and HCD-4 shortly displays the
message CONFIG LOSS.
8. Repeat steps 1 to 7 until values are assigned to all the parameters in the
desired groups.
9. After completing the configuration actions, you can use steps 1 and 2 to return
to the ALARM BUFFER screen; the top row displays ALARM BUFFER.
If ON-state alarm messages are stored in the alarm buffer and the current screen is
not HDSL DIAG, the ALARM BUFFER screen will be automatically displayed if no
button is pressed for one minute.
Note Pressing ENTER accepts your choice only if the cursor is in the right-hand field of the
second row.

3.5 Front Panel Configuration Commands

This section lists the commands that are necessary to configure and operate
HCD-4 from the front panel. For a full list of HCD-4 commands, with instructions
on their use, refer to Appendix G.
Data Channel Parameters
To set the data channel parameters, scroll to PORT PARAM in the top row. This
command allows you to set the data rate and several other data transfer
parameters, depending on whether or not the channel has an Ethernet interface.
Control Port Parameters
If you plan to configure or manage HCD-4 from a remote terminal, you should set
the control port parameters. To do this, scroll to SP PARAMETERS in the top row.
This command lets you set the control port parity, interface, and management
mode. In most cases, you should use the default settings.
System Parameters
You should set the system parameters on the central unit. To do this, scroll to
SYSTEM PARAMETER in the top row. This command allows you to enable or
disable remote unit configuration.

3-10 Front Panel Configuration Commands

 Chapter 4
Control from the
Supervisory Port
This chapter provides detailed instructions for managing HCD-4 by means of an
ASCII terminal.
The initial configuring of HCD-4 is to be performed using a standard ASCII
terminal connected to the HCD-4 control port, CONTROL DCE.
Managing HCD-4 from the front panel is described in Chapter 3, Front Panel
Operating Instructions.
This chapter explains how to manage HCD-4 from a supervisory port, and includes
the following information:
• Supervision terminal hardware requirements, communication and
handshaking – Section 4.1
• Initial configuration session – Section 4.2
• Running a management session, including instructions for entering commands
through the supervision terminal – Section 4.3
• A list of commands and command options – Section 4.4
• Brief description of configuration commands – Section 4.5.

The instructions in this chapter assume that the supervision terminal operator is
familiar with the HCD-4 system and its configuration parameters.

4.1 Hardware Requirements for Supervisory Port

Management

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 HCD-4 operation.
Control Port Interface Characteristics
HCD-4 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.

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Chapter 4 Control from the Supervisory Port HCD-4 Installation and Operation Manual

The supervision terminal can be connected to the HCD-4 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
HCD-4 supports two types of modems:
• Dial-up Hayes compatible modems. HCD-4 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 4-1.

Table 4-1. 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 HCD-4 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 HCD-4 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
supervision 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 you end the terminal control connection, returning the control to the
HCD-4 front panel, the DTR line goes OFF (becomes inactive).

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HCD-4 Installation and Operation Manual Chapter 4 Control from the Supervisory Port

Request to Send (RTS)

The RTS line is normally ON (active) when the supervision terminal is in session.
When the RTS line is OFF (inactive), HCD-4 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.

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 HCD-4 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 HCD-4 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, HCD-4 always sets DSR OFF (inactive) for 5 seconds when the EXIT
command is executed, or the disconnect timeout expires.

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Chapter 4 Control from the Supervisory Port HCD-4 Installation and Operation Manual

4.2 Preliminary Settings for Initial Configuration Session

Configuring the Supervisory Terminal

You must configure the supervisory terminal for the communication parameters
used by the HCD-4 CONTROL DCE port before initializing communication
session with HCD-4:
➤ 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 HCD-4.
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 HCD-4 for Supervisory Port Management
The software necessary to run the HCD-4 control program is contained in the
HCD-4 system. To initialize HCD-4 for correct terminal operation, the Control
Port parameters should be set as described in Table 4-2. For a full description of
the control port parameters, refer to Appendix G. For instructions on configuring
the HCD-4 parameters, refer to Local Configuration Setup Procedure in Chapter 3.

Table 4-2. Control Port Parameters for Supervisory Port Management

Parameter Setting for Supervisory Port Management Default

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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HCD-4 Installation and Operation Manual Chapter 4 Control from the Supervisory Port

4.3 Running a Supervision Terminal Management

Session
Any time you connect the supervision terminal to the control port of the working
HCD-4, the following message appears:
Supervisory Port On Line. Type ‘H’ For Help
If the supervision terminal is connected to the control port of HCD-4 in the
turn-on process, the following message appears after the power-up self-test is
completed:
HCD-4 Self Test Passed
or
HCD-4 Self Test Failed
In the latter case, investigate the problem with the DSP HDR TST command and
correct it before proceeding further.
Starting a Control Session
➤ To start the control session:
• When the node number of HCD-4 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. HCD-4 echoes the node
number, i.e. Node<SP>‘node number’<SP>.
• When password protection is enabled, HCD-4 displays the PASSWORD>
prompt at the beginning of the session. Enter your password at the
PASSWORD> prompt; HCD-4 responds to your input with asterisks. The
default password is HCD4.

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, HCD-4 displays the prompt HCD-4>.
If password protection is not enabled, the HCD-4> prompt appears at the
beginning of the session.
Entering Commands
This section explains how to enter HCD-4 commands using a supervisory port.
Commands are not case-sensitive; you can enter commands in either lowercase or
uppercase letters.
For each command, you can use either the full command or a shortened
mnemonic for the command. The mnemonics are listed along with the commands
in this chapter.

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Chapter 4 Control from the Supervisory Port HCD-4 Installation and Operation Manual

➤ To enter commands:
• Enter commands at the HCD-4> 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>.
HCD-4 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 escape from the current command without executing the command, press
<Ctrl>+<C>; the HCD-4>prompt appears.
• To execute a command, press <Enter>; when the command is executed,
HCD-4 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 HCD-4> prompt
appears, and you can enter a new command.
• If an idle disconnect timeout is specified, HCD-4 automatically disconnects the
ongoing session if no command is received from the terminal for the specified
timeout interval.
• If you enter an invalid command, HCD-4 does not execute it and displays the
following:
If the command is not valid in the current system configuration, or the
values you are trying to set are incorrect, HCD-4 displays an appropriate
error message. For a list of configuration error messages, refer to
Configuration Error Messages in Chapter 5.
If the command syntax is incorrect, HCD-4 displays one of the following
messages:
‘Unknown Expression “xxx”’
where “xxx” stands for the first incorrect part of the command, or
‘Missing Token in Line’
in cases where part of the legal command syntax is missing.
Below this message, the following message appears:
‘Bad command or parameter. Type ‘h’ for help’
In either case, you must enter the correct command.

Note While HCD-4 is being managed from a supervisory port, the front panel controls on
the HCD-4 unit are disabled.

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HCD-4 Installation and Operation Manual Chapter 4 Control from the Supervisory Port

Troubleshooting Command Entry

If HCD-4 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.
• HCD-4 is configured to use a non-zero node number.

You can cover both possibilities by setting section 3 (DB INIT) of the HCD-4 Setup
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, HCD-4 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 the HCD-4 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 HCD-4 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 1 (PASSWD) of the Setup DIP switch to ON, to
enforce the default password ‘HCD4’. This action enforces the default (0)
node number, and you can enter the password without any node number
prefix. Now, the HCD-4 working prompt appears and you can start the
session.
2. Set section 1 (PASSWD) of the Setup 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 ‘HCD4’ to display the working
prompt.
3. Set section 2 (DEF SP) of the Setup 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 HCD-4 front-panel CONTROL DCE connector.
• Send the EXIT command from the supervision terminal.
• HCD-4 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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Chapter 4 Control from the Supervisory Port HCD-4 Installation and Operation Manual

4.4 HCD-4 Command Language

This section presents the HCD-4 command options and the index of commands.
Command Options
The options listed in Table 4-3 are available with certain commands. The list of
commands in Table 4-4 identifies which options are available with which
commands.

Table 4-3. 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
alarm is explained in Alarms in Chapter 5.
/CA Clear all DSP ALM /CA
Displays, then clears, all the alarms stored in
the alarm buffer.

Index of Commands
Table 4-4 lists the HCD-4 commands in alphabetical order. For a full description of
each command, refer to Appendix G.

Table 4-4. HCD-4 Command Set Index

Command Mnemonic Purpose Options

CLR ALM CA Clear alarm messages stored in the HCD-4 alarm /A
buffer
CLR ALM REM CA R Clear alarm messages stored in the remote unit alarm /A
buffer
CLR LOOP L LINE, or CLM Deactivate a local (L) loopback on the HDSL lines
CLR LP L LINE (only for HCD-4 configured as central)
CLR LOOP L CH, or CL Deactivate the local (L) loopback on data channel of
CLR LP L CH local HCD-4
CLR LOOP R CH, or CR Deactivate the remote (R) loopback on data channel
CLR LP R CH of local HCD-4
CLR LOOP R R CH, or CRR Deactivate the remote (R) loopback on data channel
CLR LP R R CH of the remote unit
CLR TST CT Clear all user-initiated tests and loopbacks
DATE Set the internal date for HCD-4

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HCD-4 Installation and Operation Manual Chapter 4 Control from the Supervisory Port

Table 4-4. HCD-4 Command Set Index (Cont.)

Command Mnemonic Purpose Options

DEF ALM MASK DA Display and modify the alarm masks (masked alarms
are not reported)
DEF CALL DO Define the dial-out parameters for the dial-out port
DEF CH DC Configure the parameters of the data channel
DEF NAME DNA Define the logical name of the HCD-4
DEF NODE DN Define the node number of the HCD-4
DEF PWD Define a password
DEF SP or DEF CONTROL DP Define control port parameters
DEF SYS Define system parameters
DEF TERM DT Reset the terminal control codes to 0
DEF TERM VT100 DT VT100 Select the control codes for one of the standard
DEF TERM TV920 DT VT920 terminal types
DEF TERM VT52 DT VT52
DEF TERM FREEDOM100 DT FREEDOM100
DEF TERM FREEDOM220 DT FREEDOM220
DSP ALM SA Display the contents of the local unit alarm buffer, /C
and optionally clear the buffer /CA
DSP ALM REM SA R Display the contents of the remote unit alarm buffer, /C
and optionally clear the buffer /CA
DSP HDR TST SH Display hardware faults detected during the power-on
self-test and during normal operation
DSP HDSL PM [LP1] SPM LP1 Display the contents of the performance monitoring /CA
DSP HDSL PM [LP2] SPM LP2 registers of the corresponding HDSL line of the local
HCD-4, and optionally clear these registers
DSP R HDR TST SHR Display hardware faults detected at the remote unit
(during the power-on self-test and during normal
operation)
DSP R HDSL PM [LP1] SRPM LP1 Display the contents of the performance monitoring /CA
DSP R HDSL PM [LP2] SPRM LP2 registers of the remote unit for the corresponding
HDSL line, and optionally clear these registers
DSP ST CH SS Display status information on the data channel
DSP ST LINE 1 SSL 1 Display status information on the HDSL line
DSP ST LINE 2 SSL 2
DSP ST SYS SSY Display system status information (logical name and
number, software and hardware versions, clock
source, central/remote mode, type of remote unit,
type of data channel interface, current data rate, type
of power supply)
EXIT End the current control session

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Chapter 4 Control from the Supervisory Port HCD-4 Installation and Operation Manual

Table 4-4. HCD-4 Command Set Index (Cont.)

Command Mnemonic Purpose Options

F Select the codes for the “clear the screen”, “cursor
right”, and “cursor home” commands sent to the
supervision terminal
HELP H Display a concise index of commands and option
switches
INIT DB Reload the database with the default parameters
instead of the user-configured parameters.
Appendix G lists default parameter values.
INIT F Reset the codes for “clear the screen”, “cursor right”,
and “cursor home” to 0
LOOP L LINE, or LLM Activate a local (L) loopback on the HDSL lines.
LP L LINE This command is available only for the HCD-4 units
configured as central.
LOOP L CH, or LL Activate the local (L) loopback on data channel of
LP L CH local HCD-4
LOOP R CH, or LR Activate the remote (R) loopback on data channel of
LP R CH local HCD-4
LOOP R R CH, or LRR Activate the remote (R) loopback on data channel of
LP R R CH remote unit
RESET Reset the HCD-4 system
TIME Set the internal time of HCD-4

4.5 Configuring HCD-4 with the Supervision Terminal

This section lists the commands that are necessary to configure and operate
HCD-4 from a supervisory port. For a full list of HCD-4 commands, with
instructions on their use, refer to Appendix G.
Terminal Type
After successfully starting the management session, use the command
DEF TERM ’terminal_type’ to select the terminal type, if needed. ‘terminal_type’
stands for one of the following types: VT-52, VT-100, TV-920, FREEDOM-100, or
FREEDOM-220. If your terminal requires control sequences differing 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, and
then use the F command to modify the control codes starting from the known field
values.

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Control Port Parameters

To set the control port parameters, use the command DEF SP or DEF CONTROL.
This command lets you set the parity, interface, and management mode for the
control port. In most cases, you should use the default settings. Use this command
to activate password, call-out, and pop-alarm abilities.
System Parameters
If you are configuring the central unit, you should set the system parameters. To do
this, use the command DEF SYS. This command allows you to enable or disable
remote unit configuration.
Data Channel Parameters
To set the data channel parameters, use the command DEF CH. This command
allows you to set the channel data rate and several other data transfer parameters,
depending on whether or not the channel has an Ethernet interface.
Node Number
When the supervisory terminal is used to control a single HCD-4, always assign
node number 0 to the HCD-4.
For multidrop operation, each HCD-4 can be assigned a node number in the
range of 1 through 255. Assigning node number 0 to the HCD-4 means that it will
accept and answer any message.
This is not permitted in multidrop operation. However, it is recommended to use
node number 0 for both point-to-point and dial-up modes.
Use the DEF NODE command to assign node numbers.
Logical Name
Each HCD-4 can be assigned a logical name of up to eight characters. The logical
name is sent in each transmission of alarm messages. The name helps the operator
to identify the source of messages that are received by the supervision terminal.
Use the DEF NAME command to define the unit’s logical name.
Reset
To reset HCD-4, use the RESET command. This command causes HCD-4 to
initialize, thereby disrupting traffic through the HCD-4 until it resumes normal
operation.

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4-12 Configuring HCD-4 with the Supervision Terminal

 Chapter 5
Troubleshooting and
Diagnostics

5.1 General
This chapter describes the HCD-4 diagnostics functions, which include:
• Status indications, alarms, configuration errors, general troubleshooting –
Section 5.2
• Performance diagnostics – Section 5.3
• Diagnostic loopbacks – Section 5.4

5.2 Error Detection

This section explains how to detect and fix errors and other problematic conditions
in the HCD-4. Included in this section is information on:
• Power-up self-test
• Alarms
• Configuration error messages
• General troubleshooting.

Power-Up Self-Test
HCD-4 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, HCD-4 displays its
current software revision on the LCD. After successfully completing the self-test
procedure, HCD-4 switches to the default ALARM BUFFER screen.
In case of failure, HCD-4 displays an appropriate message in the second row of the
front panel. For more information on the power-up self-test, refer to Turning
HCD-4 On in Chapter 3.
Front-Panel LEDs
The status of HCD-4 is indicated by the ALM, TST, TD/RD 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 HCD-4 Installation and Operation Manual

Alarms
HCD-4 maintains an alarm buffer, which can store up to 100 alarm messages.
Alarms can be of two types, designated as ON/OFF and ON:
• 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-type alarm remains displayed on the LCD even
after the event that caused the alarm condition is cleared.
• 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 01 DB CHECKSUM ERROR OFF 2000-01-01 00:04.46
ALARM 01 DB CHECKSUM ERROR ON 2000-01-01 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
HCD-4 LCD and control terminal, and lists the actions required to correct each
alarm condition.
Alarm Relay
HCD-4 has an alarm relay, which enables you to automatically turn on alarm
indication by properly connecting the relay alarm contacts to your alarm
equipment (refer to Connecting the HCD-4 Alarm Relay Port in Chapter 4).
The alarm relay has a pair of change-over dry contacts. The Normally-Open (NO)
contacts close in case of an alarm, and the Normally-Close (NC) contacts open in
case of an alarm (see Appendix A for the ALM RLY connector pinout). The alarm
contacts are floating with respect to the signal and chassis grounds of HCD-4.
The following events activate the alarm relay:
• Loss of power (indicated by the NO contacts)
• Detection of a hardware failure, or any other failure, during the power-up
self-test
• Detection of a disruption in the database during the power-up self-test
• Loss of HDSL line synchronization.
The corresponding alarms in Table 5-1 are marked with an asterisk (*). The relay
returns automatically to the no-alarm state when none of the alarm conditions
listed above is present.

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Table 5-1. HCD-4 Alarm Buffer Messages

LCD Message Terminal Message Alarm Probable Cause Corrective Actions Alarm Severity
Number Type
_ ALARM BUFFER 2 More than 100 alarm entries Read the messages and then clear the buffer ON/OFF Minor
OVERFLOW have been written in the alarm by sending the CLR ALM/A command from
buffer since the last clear the control terminal.
command. New alarms are
overwriting older alarms.
DB CHKSUM ERR* DB CHECKSUM 1 The database currently stored Enter the INIT DB command from the ON/OFF Major
ERROR* in the non-volatile memory of control terminal or set the Section 3 (DB
HCD-4 is corrupted. INIT) of the Setup DIP switch to ON, to
load the default configuration in the place
of the current database, then reconfigure
HCD-4 with the desired parameters.
Perform the power-up self-test and replace
HCD-4 if it fails the test.
DB-INIT DW IS ON DB-INIT SWITCH IS 6 Section 3 (DB INIT) of the If it is no longer necessary to enforce the ON Minor
ON* Setup DIP switch is set to ON. default database parameter values, change
This message appears only setting to OFF.
upon power-up.
DIAL CYCLE FAIL DP DIAL CYCLE FAILED 8 The current cycle of call Check the modem connected to the ON Minor
attempts (both to the primary CONTROL DCE connector. If the called
and alternate numbers) failed. numbers are often busy, you may also
increase the number of call retries
DP ALT CALL FAIL DP ALTERNATE CALL 10 The call attempts to the If the number is not busy, check the ON Minor
FAILED alternate dial-out number modem connected to the CONTROL DCE
failed connector. If the called numbers (primary as
well as alternate) are often busy, you may
also increase the number of call retries

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Table 5-1. HCD-4 Alarm Buffer Messages (Cont.)

LCD Message Terminal Message Alarm Cause Corrective Actions Alarm Severity
Number Type
DP PRM CALL FAIL DP PRIMARY CALL 9 The call attempts to the If the number is not busy, check the ON Minor
FAILED primary dial-out number modem connected to the CONTROL DCE
failed connector. If the called number is often
busy, you may also increase the number of
call retries
DTE NC TO CH DTE NOT CONNECTED 19 The Ethernet interface is not Check the cable connecting the LAN, the ON/OFF Major
TO CH connected to an operating LAN media, and check that at least one
LAN. station is active on the LAN
LOC CRC ALM: LP1 LOCAL CRC ALM: LP1 13 A CRC-6 error has been If the number of CRC-6 errors is significant ON Minor
LOC CRC ALM: LP2 LOCAL CRC ALM: LP2 detected in the input signal of (more than a few errors per hour), perform
the HDSL line. the following:
1. Check the corresponding HDSL line to
the remote unit.
2. Perform self-test on the two units and
replace the unit that fails the self-test.
LOOPS INVERTED LOOPS ARE INVERTED 15 The unit (configured as Internally, the remote unit automatically ON/OFF Minor
remote) detected incorrect corrects the connections to enable regular
HDSL line connections operation.
(interchange between the two
HDSL lines).
PSWRD DW IS ON PASSWORD SWITCH IS 4 Section 1 (PASSWD) of the If it is no longer necessary to enforce the ON Minor
ON Setup DIP switch is set to ON. default password and node number,
This message appears only change setting to OFF.
upon power-up.
RATE DECREASED RATE DECREASED 20 The data channel of HCD-4 is Check the HDSL line to the remote unit. ON/OFF Major
configured to 4096 kbps, but
the current rate decreased to
2048 kbps, because one of
the HDSL lines is down.

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Table 5-1. HCD-4 Alarm Buffer Messages (Cont.)

LCD Message Terminal Message Alarm Cause Corrective Actions Alarm Severity
Number Type
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 Minor
REM CRC ALM: LP2 REMOTE CRC ALM: LP2 CRC-6 error has been (more than a few errors per hour), perform
detected in the input signal of the following:
the specified 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.
SELF TEST ERROR* SELF TEST ERROR* 3 A problem has been detected 1. Check the cause of the failure, using the ON Major
during HCD-4 self-test. DSP HDR TST command.
2. Perform the power-up self test and
replace HCD-4 if it fails the test.
SIGNAL LOSS:LP1* SIGNAL LOSS:LP1* 11 Loss of input signal on the 1. Check the specified HDSL line. ON/OFF Major
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 5 Section 2 (DEF SP) of the If it is no longer necessary to enforce the ON Minor
Setup DIP switch is set to default control port parameters, change
ON. This message appears setting to OFF.
only upon power-up.
STUFF OVERFLOW STUFFING OVERFLOW 16 The stuffing mechanism 1. Check the equipment providing the DTE ON Minor
cannot compensate for the signal (unstable clock source).
frequency difference between
2. Perform the power-up self-test and
the DTE clock and the HDSL
replace HCD-4 if it fails the test.
clock.

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Table 5-1. HCD-4 Alarm Buffer Messages (Cont.)

LCD Message Terminal Message Alarm Cause Corrective Actions Alarm Severity
Number Type
SYNC LOSS:LP1* SYNC LOSS:LP1* 12 Loss of synchronization on the Check the specified HDSL line. ON/OFF Major
SYNC LOSS:LP2* SYNC LOSS:LP2* corresponding HDSL line
Perform self-test on the two units and
replace the one that fails the self-test.
TIMING OVERFLOW HDSL TIMING 17 The data line recovery circuits Check the equipment providing the data ON Minor
OVERFLOW cannot recover the data line signal, and make sure its clock source is
clock, because its frequency is stable.
not within the supported
Perform the power-up self-test and replace
range.
HCD-4 if it fails the test.

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Working with Alarm Buffer

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

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:
During normal operation, the second row shows EMPTY (no alarm
messages).
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 HCD-4 alarm buffer:
1. Scroll with the CURSOR button 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.

Masking Alarm Messages

You can mask alarms from the control terminal. When you mask an alarm, that
alarm is not reported. Alarm masks let you disable alarm generation by unused
ports, alarm generation during maintenance, etc.
Use the command DEF ALM MASK to mask alarms. For details on masking alarms,
refer to the DEF ALM MASK command in Appendix G.

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Configuration Error Messages

If HCD-4 detects a configuration mismatch, it displays an appropriate
configuration error message. These messages appear on either the LCD or the
supervision terminal. Some of the messages are not available on the LCD. There is
also one unavailable on the supervision 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 5-2 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 5-2. Configuration Error Messages

Error Code Terminal Message and Description

ERROR 01 ILLEGAL LOOP COMBINATION
You are trying to activate local and remote loopbacks on the same channel.
ERROR 02* LOOP IS NOT ACTIVE
You are trying to deactivate a loopback that is not active.
ERROR 03 PASSWORD IS ON
You are trying to change a parameter from the front panel when the password
protection is enabled.
ERROR 04 ILLEGAL NODE NUMBER
You are trying to select a node with number greater than 255.
ERROR 05 ILLEGAL PARAMETER FOR CURRENT CONFIGURATION
You are using a parameter that is not supported by this HCD-4 version or
configuration.
ERROR 06 LOOP IS ACTIVE, CAN’T UPDATE HARDWARE
When a loopback is active, it is not possible to change the HCD-4 operating mode in
accordance with the updated configuration parameters. You must first deactivate the
loopback.
ERROR 07* CURRENT LOOP IS ALREADY BEING PERFORMED
You are trying to perform a loopback that is currently active.
ERROR 08 Reserved for future use
ERROR 09 CURRENT LOOP IS ALREADY BEING PERFORMED
You are trying to perform a loopback that is currently active.
ERROR 10 Reserved for future use

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Table 5-2. Configuration Error Messages (Cont.)

Error Code Terminal Message and Description

ERROR 11 ILLEGAL NUMBER OF DAYS FOR THIS MONTH
You are trying to select an invalid number for the day of the month.
ERROR 12 MONTH SHOULD BE IN THE RANGE 01-12
You are trying to select an invalid number for the month.
ERROR 13 YEAR SHOULD BE IN THE RANGE 2000-2099
You are trying to select an invalid number for the year.
ERROR 14 SECONDS SHOULD BE IN THE RANGE 00-59
You are trying to select an invalid number for seconds.
ERROR 15 MINUTES SHOULD BE IN THE RANGE 00-59
You are trying to select an invalid number for minutes.
ERROR 16 HOURS SHOULD BE IN THE RANGE 00-23
You are trying to select an invalid number for hours.
ERROR 17 ILLEGAL DCD_DEL AND INTERFACE COMBINATION
You are trying to select a non-zero DCD DELAY, while the HCD-4 supervisory port
interface has been set as DCE.
ERROR 18 CONFLICT IN INTERFACE AND DSR PARAMETERS
You selected DSR=ON, while the supervisory port interface has been set to DTE. The
DSR=ON selection is valid only for DCE interface.
ERROR 19 NEW PASSWORD IS NOT CONFIRMED
The password you have defined with the DEF PWD command, has been not
confirmed correctly

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 5-3. Perform the
actions listed under Corrective Measures in the order given in the table, until the
problem is corrected.

Table 5-3. Troubleshooting Chart

Trouble Symptoms Probable Cause Corrective Measures

HCD-4 is not No power Check that both ends of the power cable are properly
functioning. connected, and that the POWER switch is ON.
If HCD-4 is powered from DC, check the polarity of the
power connections.
Blown fuse Disconnect power cable from both ends and replace the
(AC version only) fuse with another fuse of proper rating.

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Chapter 5 Troubleshooting and Diagnostics HCD-4 Installation and Operation Manual

Table 5-3. Troubleshooting Chart (Cont.)

Trouble Symptoms Probable Cause Corrective Measures

One or both HDSL External problem Check that the remote unit is operating.
LOS LINE indicators
Check for proper connection of the pairs connecting
light
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 HCD-4 Perform a power-up self-test and replace HCD-4 if it fails
the test.
The DTE connected to Cable problem Activate the local channel loopback. If the DTE does not
the local unit’s data receive its own transmission, check the cable connecting it
channel does not to the HCD-4 data channel connector.
receive data.
Defective DTE Check the DTE.
Defective HCD-4 Perform a power-up self-test and replace HCD-4 if fails
the test.

5.3 Performance Diagnostics Data

General
HCD-4 has HDSL performance monitoring capability.
This section explains how to display performance data from the HCD-4 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 front-panel 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.

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Resetting the Performance Data Registers

You can reset the registers storing diagnostics data. To reset a register, bring the
register to display and press ENTER. To ensure that the collected data remains
meaningful and correlated after a specific register is reset, 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 performance data on the control terminal by using the DSP
HDSL PM (LPX), and DSP R HDSL PM (LPX) 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 control terminal, refer to
HCD-4 Command Language HCD-4 Command Language in Chapter 4.
Performance Monitoring Parameters
This section describes the performance evaluation and monitoring functions
provided by HCD-4.
Table 5-4 lists HCD-4 performance monitoring parameters. For each parameter,
Table 5-4 lists the parameter’s front panel display, accompanied by a short
description of the parameter and the ranges available for the parameter.

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Table 5-4. Performance Monitoring Parameters

Display Name Description Range

BBER Background Block The ratio of background block error seconds to the total seconds in the current
Error Ratio 15-minute interval. The display is updated every second.
Note: This parameter is not displayed on the LCD.
CURR BBE Current Background A BBE is an errored block not occurring during a severely errored second. This 0 - 900
Block Errors parameter displays the number of BBE 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 CRC error events, or 0 - 900
Seconds 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 from the start of the 0 - 900
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 or more OOF 0 - 900
Errored Seconds 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 Unavailable An unavailable second is any second in which a failed signal state exists. A failed 0 - 900
Seconds signal state is declared when 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 current 15-minute
Ratio interval.
Note: This parameter is not displayed on the LCD.
L.TERM BBE Long-Term This parameter displays the number of BBE measured during the current 24-hour 0 - 65535
Background Block interval. The display is updated every 15 minutes.
Errors

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Table 5-4. Performance Monitoring Parameters (Cont.)

Display Name Description Range

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

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5.4 Diagnostic Tests

The user-controlled test functions of HCD-4 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.
Before executing a test, pay attention to the following:
• At any time, you can connect only one loopback.
• If a loopback is already connected, the TST indicator lights. If you try to
perform any loopback while another loopback is already connected, HCD-4
displays an error message.
• It is not possible to change the data rate, when a loopback test is active.

Operating Loopbacks from the Front Panel

The specific LCD designations for each test are listed in Table 5-5. For general
instructions on using the HCD-4 front panel, refer to Chapter 3, Front Panel
Operating Instructions.
➤ 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), ML (available only
for the central unit) or CH. OFF indicates that either no test is currently active
or a test is active but can be deactivated. CH or ML indicates that a test is
currently active (in this case the TST LED lights), or enabled.
Note The following steps show how to operate loopbacks on the example of the CH test.
The ML test is operated in a similar way.
3. To enable the activation of the data channel test, bring the CURSOR to the
right-hand field in the top row, and scroll to display CH; the second row
displays the first test option: LOCAL CHANNEL.
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.
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.
To deactivate any test activated from this unit, perform steps 1, 2, 3 above.
In step 3, select OFF, then press ENTER. The TST LED should turn off.

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Activating the Diagnostic Loops from a Control Terminal

The diagnostic loops can be activated from a control terminal by entering the
appropriate command.
For general instructions on entering HCD-4 commands from a control terminal,
refer to Chapter 4, Control from the Supervisory Port. For specific instructions on
activating loopback commands, refer to Appendix G. This appendix lists all the
terminal commands available for HCD-4, 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, mnemonics, and any other special instructions for operating the
loopback.
The loopbacks are listed in the order set forth in Table 5-5. This table also lists the
terminal commands, mnemonics, LCD designations and brief purpose for each
loopback.

Table 5-5. Loopback Tests

Terminal Mnemonic LCD Designation Purpose

Command
Second Row Top Row
(Right)
LOOP L LINE LLM LOCAL LINE ML Checks connection to equipment connected
to the data channel, as well as circuits of the
local unit.
Note: The LOOP L LINE loopback is available only for the HCD-4 unit configured as central.
LOOP L CH LL LOCAL CH CH Checks the connections to the local data
channel interface.
LOOP R CH LR REM CH CH Checks the connections to the DTE
connected to the data channel of the
remote unit, all circuits of the remote unit,
functions of both units, and the transmission
path connecting the two units.
LOOP R R CH LRR REM REM CH CH Checks the connections to the DTE
connected to the data channel of the local
unit, all circuits of the local unit, functions of
both units, and the transmission path
connecting the two units.

Note IR-ETH, IR-IP and IR-ETH/QH interfaces do not support loopback activation.

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LOOP L LINE (LLM)

This test fully checks the connection to the equipment connected to the data
channel, as well as the circuits of the local unit.
This local loopback on the HDSL line is performed in the AFE units of both HDSL
lines, as shown in Figure 5-1. Test signal is provided either by the equipment
connected to one of the inputs, which must receive its own transmissions without
errors.

Local HCD-4 HDSL Line A Remote HCD-4

HDSL Line A HDSL Line A

Interface Interface

Tx
Ch Data Processing Processing Data Rx
Interface Interface Tx
Rx
HDSL Line B

HDSL Line B HDSL Line B

Interface Interface

Figure 5-1. LP L LINE Loopback

Notes This loopback can be activated only from the unit configured as central.
While this loopback is active, the remote unit may lose HDSL synchronization, and
there will be no data transmission to the remote unit.

LOOP L CH (LL)
This test mainly checks the connections to the local data channel interface.
This local loopback on the data channel of the local HCD-4 is performed by
connecting the data channel transmit signal to the input of the receive path, as
shown in Figure 5-2. The test signal is provided by the DTE connected to this
channel of the local HCD-4, which must receive its own transmission without
errors while the loopback is activated. During the loopback, this channel of the
local HCD-4 continues sending the user's data to the link.

Local HCD-4 Remote HCD-4

HDSL Line A
HDSL Line A HDSL Line A
Interface Interface
Tx Rx

Processing User
Data Processing Interface
Interface HDSL Line B
Ch Tx
HDSL Line B HDSL Line B
Rx Interface Interface

Figure 5-2. LP L CH Loopback

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LOOP R CH (LR)
This test checks the connections to the DTE connected to the data channel of the
remote HCD-4, all the circuits of the remote unit, the functions of the remote unit
and local HCD-4, and the transmission path connecting the two units. During the
loopback, the DTE connected to the tested channel of the local unit continues to
receive data.
This remote loopback towards the DTE connected to data channel of the remote
HCD-4 is performed by connecting the local data channel receive signal to its
transmit input, as shown in Figure 5-3. The test signal is provided by the DTE
connected to the data channel of the remote HCD-4, which must receive its own
transmission without errors while the loopback is activated.

Local HCD-4 Remote HCD-4

HDSL Line A
HDSL Line A HDSL Line A
Interface Interface

Tx Rx

Processing User
Ch Data Processing Interface
HDSL Line B
Interface Tx
HDSL Line B HDSL Line B
Rx Interface Interface

Figure 5-3. LP R CH Loopback

LOOP R R CH (LRR)
This test checks the connections to the DTE connected to the data channel of the
local HCD-4, all the circuits of the local unit, the functions of the remote unit and
local HCD-4, and the transmission path connecting the two units. During the
loopback, the DTE connected to the channel of the remote unit continues to
receive data.
This remote remote loopback towards the DTE connected to the data channel of
the local HCD-4, is performed by connecting the transmit signal of this data
channel of the remote HCD-4 to the input of its receive path within the data
channel interface circuits, as shown in Figure 5-4. The test signal is provided by the
DTE connected to the data channel of the local HCD-4, which must receive its
own transmission without errors while the loopback is activated.

Local HCD-4 HDSL Line A Remote HCD-4

HDSL Line A HDSL Line A

Interface Interface
Tx
Rx

Ch Data Processing Data

Processing
Interface Interface
HDSL Line B
Tx
Rx
HDSL Line B HDSL Line B
Interface Interface

Figure 5-4. LP R R CH Loopback

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Appendix A
Connector Wiring

A.1 HDSL Line Connector

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

Table A-1. HDSL Connector, Pin Allocation

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

A.2 Alarm Relay Connector

A special cable is required to connect HCD-4 to alarm equipment. Table A-2
provides the pin allocation for this cable.

Table A-2. Alarm Relay Connector, Pin Allocation

Pin Function
1, 5, 6 NC
2 Relay Common
3 Relay Normally Close
4 Relay Normally Open

A.3 DCE Interface Connectors and Adapter Cables

The HCD-4 synchronous data port terminates in a 25-pin D-type female
connector. The units with an IR-ETH, IR-IP or IR-ETH/QH interface arrive with the
corresponding interface module; refer to Appendix B, Appendix C or Appendix D
for the connector pinouts.

DCE Interface Connectors and Adapter Cables A-1

Appendix A Connector Wiring HCD-4 Installation and Operation Manual

RS-530 Interface
When HCD-4 is ordered with an RS-530 interface, the physical interface is a
25-pin female connector wired in accordance with Table A-3.

Table A-3. RS-530 DCE Connector

Pin Designation Direction Function

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

A-2 DCE Interface Connectors and Adapter Cables

HCD-4 Installation and Operation Manual Appendix A Connector Wiring

V.35 Interface
When you order an HCD-4 with the V.35 interface, it arrives with a RAD adapter
cable CBL-HS2V1. Table A-4 lists the pinout of the V.35 adapter cable.

Table A-4. V.35 Adapter Cable

Pin Designation Direction Function

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

DCE Interface Connectors and Adapter Cables A-3

Appendix A Connector Wiring HCD-4 Installation and Operation Manual

X.21 Interface
When you order an HCD-4 with the X.21 interface, it arrives with a RAD adapter
cable CBL-HS2X1. Table A-5 lists the pinout of the X.21 adapter cable.

Table A-5. X.21 Adapter Cable

Pin Direction Designation Function

1 ↔ FG Frame Ground
2 Input SDA Send Data (wire A)
3 Output RDA Receive Data (wire A)
4 Input RTSA RTS (wire A)
5 Output CTSA CTS (wire A)
6 Output DSRA DSR (wire A)
7 ↔ SG Signal Ground
8 Output DCDA DCD (wire A)
9 Output RCB Receive Clock (wire B)
10 Output DCDB DCD (wire B)
11 Input SCEB External Send Clock (wire B)
12 Output SCB Send Clock (wire B)
13 Output CTSB CTS (wire B)
14 Input SDB Send Data (wire B)
15 Output SCA Send Clock (wire A)
16 Output RDB Receive Data (wire B)
17 Output RCA Receive Clock (wire A)
18 N/A – Not connected
19 Input RTSB RTS (wire B)
20 Input RCEA External Receive Clock (wire A)
21 N/A – Not connected
22 Output DSRB DSR (wire B)
23 Input RCEB External Receive Clock (wire B)
24 Input SCEA External Send Clock (wire A)
25 N/A – Not connected

A-4 DCE Interface Connectors and Adapter Cables

HCD-4 Installation and Operation Manual Appendix A Connector Wiring

A.4 Control Port Connector

The HCD-4 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-6.
Table A-6 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-6. Control Port Interface Signals

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

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

Control Port Connector A-5

Appendix A Connector Wiring HCD-4 Installation and Operation Manual

A-6 Control Port Connector

Appendix B
IR-ETH Interface Module

B.1 Introduction
IR-ETH 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.
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, and then converted back to an Ethernet signal at the remote modem.
Figure B-1 shows a typical application using HCD-4 with IR-ETH module. Each
modem is connected to an Ethernet network via the Ethernet bridge.

HCD-4 HCD-4

Figure B-1. Typical Application of HCD-4 with IR-ETH Module

B.2 IR-ETH Connector

Figure B-2 shows the rear panel of HCD-4 with the IR-ETH connector.

Figure B-2. Rear Panel of HCD-4 with IR-ETH Module

IR-ETH Connector B-1

Appendix B IR-ETH Interface Module HCD-4 Installation and Operation Manual

Table B-1 provides the pinout of the IR-ETH RJ-45 connector.

Table B-1. 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

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 Shielded RJ-45
WAN Protocol (internal) HDLC
Data Rate According to the modem transmission rate

B-2 Technical Specifications

HCD-4 Installation and Operation Manual Appendix B IR-ETH Interface Module

B.4 Installation and Operation

Figure B-3 shows the IR-ETH rear panel. Figure B-4 shows the ERR D4 LED and the
DIP switch, which are located on the reverse side of the module board.

Figure B-3. IR-ETH Rear Panel

Figure B-4. IR-ETH DIP Switch and LED Locations

Setting the DIP Switch

Table B-2 describes functions and default settings of the DIP switch SW-1 sections.
The function of section 1 and section 3 are software-controlled, either from the
supervision terminal (DEF CH command), or from the front panel (CHANNEL
PRM). Its hardware switch is permanently set to OFF and is not allowed for manual
setting. Section 2 is set in accordance with Table B-2.
The DIP switch is located on the reverse side of the IR-ETH module. To change the
switch settings, you must undo three screws on the board and detach it from the
main unit.

Installation and Operation B-3

Appendix B IR-ETH Interface Module HCD-4 Installation and Operation Manual

Table B-2. DIP Switch Settings

Section Name Description Default

Number Setting
1 SQ/FD ON – Full duplex operation
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

4 (nc)

Note Set section 1 and section 3 of the DIP switch to OFF to allow the software control
of the Ethernet mode and filtering.

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

Table B-3. IR-ETH LED Indicators

LED Description Location Color

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

Connecting the 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 do implement the crossover function internally while network
interface cards and other devices do not.

B-4 Installation and Operation

 Appendix C
IR-IP Interface Module

C.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.
HCD-4 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 C-1
Appendix C IR-IP Interface Module HCD-4 Installation and Operation Manual

Application
Figure C-1 shows a typical application of the HCD-4 modem equipped with the
IR-IP interface module.

HDSL

HCD-4 HCD-4 with Router

with IR-IP V.35 Interface

Figure C-1. Typical Application of the HCD-4 Unit with IR-IP

C.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

C.3 Physical Description

Figure C-2 shows the rear panel of HCD-4 with the IR-IP interface module.

Figure C-2. Rear Panel of HCD-4 with the IR-IP Module

C-2 Physical Description

HCD-4 Installation and Operation Manual Appendix C IR-IP Interface Module

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

Table C-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 C-3.
Table C-2 lists the DIP switch functions.

Figure C-3. IR-IP DIP Switch

Table C-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 C-3

Appendix C IR-IP Interface Module HCD-4 Installation and Operation Manual

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

Table C-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

C.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:
Software downloading
Resetting of various subsystems
Display of error log
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 HCD-4
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.

C-4 IR-IP Management Subsystem, General

HCD-4 Installation and Operation Manual Appendix C 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 HCD-4 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
HCD-4 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.

C.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 C-5

Appendix C IR-IP Interface Module HCD-4 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.

C-6 Performing Preliminary Configuration

HCD-4 Installation and Operation Manual Appendix C 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 C-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 HCD-4 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.

Performing Preliminary Configuration C-7

Appendix C IR-IP Interface Module HCD-4 Installation and Operation Manual

2. Turn HCD-4 on and monitor the IP router indicators:

The INT indicator turns on
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 HCD-4 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 HCD-4 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 HCD-4 is turned on
The IR-IP interface module does not receive power from the HCD-4 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.

C-8 Performing Preliminary Configuration

HCD-4 Installation and Operation Manual Appendix C IR-IP Interface Module

➤ The ERR indicator does not light immediately after HCD-4 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.

C.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 C-4.
As seen in Figure C-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 C-9

 Appendix C IR-IP Interface Module HCD-4 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 C-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 C-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 C-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 C-5. Management Utility, Menu Structure

C-10 IR-IP Management Utility

HCD-4 Installation and Operation Manual Appendix C IR-IP Interface Module

C.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 C-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 C-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 C-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.
HCD-4 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 C-7. Selecting the IP Subnet Mask

Quick Setup Menu C-11

Appendix C IR-IP Interface Module HCD-4 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
HCD-4 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.

C-12 Quick Setup Menu

HCD-4 Installation and Operation Manual Appendix C IR-IP Interface Module

C.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 C-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 C-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 C-13

Appendix C IR-IP Interface Module HCD-4 Installation and Operation Manual

C.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 C-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 C-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 C-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 C-10. Device Identification Menu

C-14 Advanced Setup Menu

HCD-4 Installation and Operation Manual Appendix C 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 C-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 C-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 C-15

Appendix C IR-IP Interface Module HCD-4 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 C-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.

C-16 Advanced Setup Menu

HCD-4 Installation and Operation Manual Appendix C 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 C-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 C-12. Frame Relay Protocol Parameters Menu

WAN Protocol Parameters – PPP Protocol Menu

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 C-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 C-17

Appendix C IR-IP Interface Module HCD-4 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 C-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 C-13. PPP Protocol Parameters Menu

C-18 Advanced Setup Menu

HCD-4 Installation and Operation Manual Appendix C 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 C-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 C-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 C-19).
• TRANSPARENT – All the IP multicast frames are forwarded, irrespective of the
Static Multicast Groups table.

Advanced Setup Menu C-19

Appendix C IR-IP Interface Module HCD-4 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 C-15. Static Multicast Groups Table

C.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 C-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 C-16. Device Control Menu

C-20 Device Control Menu

HCD-4 Installation and Operation Manual Appendix C 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 C-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 C-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 C-21

Appendix C IR-IP Interface Module HCD-4 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 C-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.

C-22 Device Control Menu

HCD-4 Installation and Operation Manual Appendix C 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.

C.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 C-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 C-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 C-20).

View Menu C-23

Appendix C IR-IP Interface Module HCD-4 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 C-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 C-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 C-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 C-22).

C-24 View Menu

HCD-4 Installation and Operation Manual Appendix C 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 C-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 C-23 and Figure C-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 C-23. LAN Statistics Screen

View Menu C-25

Appendix C IR-IP Interface Module HCD-4 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 C-24. WAN Statistics Screen

C.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 C-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 C-25. Diagnostic Tools Menu

C-26 Diagnostic Tool (Ping Terminal) Menu

HCD-4 Installation and Operation Manual Appendix C 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 C-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 C-26. Diagnostic Tools Menu after Receiving Pinging Response

Diagnostic Tool (Ping Terminal) Menu C-27

Appendix C IR-IP Interface Module HCD-4 Installation and Operation Manual

C.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 HCD-4 off.
2. Set all the four sections of the IR-IP DIP switch (Figure C-3) to ON.
3. Turn HCD-4 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 HCD-4 off and then back on.
To abort the whole operation, turn HCD-4 off, return all the four-switch section to
the desired positions, and then turn HCD-4 on again.
5. Turn HCD-4 off, and the return all the four sections of the DIP switch to the
desired positions.

C.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 C-16) fails, and the IP router
card does not function properly.

C-28 Erasing IR-IP Software

HCD-4 Installation and Operation Manual Appendix C IR-IP Interface Module

Erasing Application Software

➤ To erase the application software:
1. Turn HCD-4 off.
2. Set all the four sections of IR-IP DIP switch to ON.
3. Turn the HCD-4 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 HCD-4 off and then back on.
Alternately, to abort the whole operation, turn HCD-4 off, return all the four
switches to the desired positions, and then turn HCD-4 on again.
5. Turn HCD-4 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 HCD-4 off.
2. Set all the four sections of the IR-IP DIP switch to OFF.
3. Turn HCD-4 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.
If the download is successful, IR-IP starts using the new software.
If the downloading fails, repeat the download process.

Erasing IR-IP Software C-29

Appendix C IR-IP Interface Module HCD-4 Installation and Operation Manual

C-30 Erasing IR-IP Software

Appendix D
IR-ETH/QH Interface Module
The IR-ETH/QH interface module includes a high performance self-learning Fast
Ethernet bridge, which is connected to the LAN via a single 10BaseT or 100BaseT
port, operating in full duplex and providing simple and cost-effective
interconnection between 10/100BaseT LANs. The module also supports IEEE
802.1/Q frames.
The module automatically learns MAC addresses of the LAN to which it is
connected. Its LAN table stores up to 1,000 addresses with 5-minute automatic
aging.
Filtering and forwarding is performed at the maximum theoretical rate of
150,000 packets per second (wire speed). The buffer with 1 Mb DRAM can hold
170 frames with a throughput latency of one frame. The forwarding of the
broadcast and multicast messages from LAN to WAN can be disabled.
Figure D-1 shows a typical application using HCD-4 with IR-ETH/QH module.

HCD-4 HCD-4

Figure D-1. Typical Application of HCD-4 with IR-ETH/QH Module

D.1 IR-ETH/QH Connector

Figure D-2 shows the rear panel of HCD-4, equipped with IR-ETH/QH module.
Table D-1 lists the module's RJ-45 connector pinout.

10/100BASE-T

LINK ACT
100M

Figure D-2. Rear Panel of HCD-4 with IR-ETH/QH Module

IR-ETH/QH Connector D-1

Appendix D IR-ETH/QH Interface Module HCD-4 Installation and Operation Manual

Table D-1. RJ-45 Connector Pinout

Pin Signal Function
1 RD (+) Receive Data (positive)
2 RD (-) Receive Data (negative)
3 TD (+) Transmit Data (positive)
6 TD (-) Transmit Data (negative)

D.2 Technical Specifications

Bridge LAN Table 1,000 MAC addresses
Aging 5 minute, automatic
Filtering and 150,000 packets per second
Forwarding Rate
Buffer Size 170 frames
Delay 1 frame
LAN Standard IEEE 802.3/Ethernet V.2
IEEE 802.1/Q
Data Rate • 10BaseT: 10 Mbps (20 Mbps in full duplex)
• 100BaseT: 100 Mbps (200 Mbps in full duplex)
Transmission Line 4-wire, Category 5 UTP, 19 AWG to 26 AWG
Line Code • 10BaseT: Manchester
• 100BaseT: MLT3
Connector RJ-45
WAN Protocol Point-to-Point
Data Rate According to the modem transmission rate

D.3 Installation and Operation

Figure D-3 shows the DIP switch, which is located on the IR-ETH/QH PCB.

ON
12 3 4 5 6 7 8

Figure D-3. DIP Switch Location

D-2 Installation and Operation

HCD-4 Installation and Operation Manual Appendix D IR-ETH/QH Interface Module

Setting the DIP Switch

Configure IR-ETH/QH module by setting the DIP switch in accordance with
Table D-2.
Table D-2. DIP Switch Settings
Section Name Description Possible Settings Factory Setting
1 NC OFF
2 NC OFF
3 10/100 Selects the LAN speed ON – LAN speed is set to 100 Mbps OFF
OFF – LAN speed is set to 10 Mbps
4 AN1 Controls the LAN ON – LAN autonegotiation is disabled
autonegotiation
OFF – LAN autonegotiation is enabled OFF
5 HF1 Selects the LAN mode ON – LAN full duplex mode
OFF – LAN half duplex mode OFF
6 BPR Controls the backpressure ON – Backpressure is enabled
OFF – Backpressure is disabled OFF
7 MUL Controls LAN to WAN ON – Multicast messages from LAN to
multicasting WAN are blocked
OFF – Multicast messages from LAN to OFF
WAN are not blocked
8 SCR Controls the scrambling of ON – Ethernet frames are scrambled
Ethernet frames
OFF – Ethernet frames are left OFF
unchanged

Installation and Operation D-3

Appendix D IR-ETH/QH Interface Module HCD-4 Installation and Operation Manual

LED Indicators
Table D-3 lists the IR-ETH/QH rear-panel LED indicators and describes their
functions.
Table D-3. IR-ETH/QH LED Indicators
LED Name Color Description Location
LINK Green ON – LAN is connected to the IR-ETH/QH module Connector
ACT Yellow ON – LAN is receiving/transmitting data Connector
100 Green ON – LAN is operating at 100 Mbps Panel
OFF – LAN is operating at 10 Mbps

Connecting the 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 NICs and other
devices do not.

D-4 Installation and Operation

 Appendix E
Installing New Software
Releases
This appendix presents procedures for installing new software releases in the
HCD-4 unit.
The HCD-4 unit stores the software in FLASH memory. The software is stored in
compressed format, and is decompressed and loaded into the HCD-4 RAM upon
power-up.
The new software is loaded off-line, using any PC directly connected to the serial
port of the HCD-4 unit. In this case, the HCD-4 system cannot carry traffic while
software downloading takes place. This procedure can be used both to upgrade
the unit software version, and to install software in a new HCD-4 unit, e.g., a
repaired unit. This installation method is called cold, or local, software installation.
The cold software installation process must be performed from the DOS prompt.
Software releases are distributed on diskettes. The diskettes carry the compressed
software file, HCD.ARJ, and a downloading program, DL.EXE, which is required
only for performing the cold installation.

E.1 Cold (Local) Installation Procedure

Preparations
➤ Take the following preparatory steps before downloading the new software:
1. Copy the distribution files, HCD4.ARJ and DL.EXE, to the root directory of
your PC.
2. Connect the desired serial port of the PC to the 9-pin connector designated
CONTROL on the front panel of the HCD-4 unit. Use a standard straight
communication cable.
3. Run the DL.EXE program. After the program starts, select option C, and
configure the PC for downloading as follows:
Select option P, then select the PC serial port, COM1 or COM2, which is
connected to the HCD-4 unit.
Press <Esc>.
Select option F and enter HCD4.ARJ as the file name.
Press <Esc>.

Cold (Local) Installation Procedure E-1

Appendix E Installing New Software Releases HCD-4 Installation and Operation Manual

Downloading
After you have copied the distribution files and run the DL.EXE program, you
should finish the downloading procedure by erasing the HCD-4 FLASH memory
and decompressing the new software release. This is performed by toggling the
internal DIP switch S3 with a pencil or other non-conductive sharp object.

Do not touch any components other than DIP switch S3 while performing the
downloading procedure, in order to avoid electrical shock.

Warning

➤ To perform the download procedure:

1. Open the HCD-4 case as described in Chapter 2.
2. Set section 1 of the DIP switch S3 to the ON position. For information on
setting this DIP switch, refer to Setting the Jumpers and Switches in Chapter 2.
3. Turn the HCD-4 on and wait about five seconds, until all the LEDs go off.
4. Set section 1 of DIP switch S3 to OFF, and then back to ON. This is needed to
prevent erasing the HCD-4 software in case you mistakenly turn the power on
while section 1 of the DIP switch is set to ON.
5. If FLASH memory is successfully erased, the TST and ALM indicators on the
HCD-4 front panel go on; then the ALM indicator starts flashing while TST
continues to light steadily.
Note If a fault occurs during the erase process, the TST and ALM indicators display
periodical bursts of 6 flashes. In this case, turn the HCD-4 off, then restart the
procedure with section 1 of DIP switch S3 set to ON.
6. Start to send the HCD4.ARJ file by selecting option S from the DL.EXE
program. The software file is sent to the HCD-4. As the file downloads, you
can monitor the progress of file transmission on the PC. If the download is
proceeding normally, the TST indicator on the HCD-4 unit flashes and the ALM
indicator is steadily on or off.
7. Wait until the TST and ALM indicators are both off. This indicates that the
download has been successfully completed.
8. Select option Q to quit the DL.EXE program.
9. Set section 1 of DIP switch S3 to OFF. The new software is decompressed and
loaded into the unit's DRAM memory. Note that the TST indicator flashes
during decompression.
10. When the decompression process is completed, the software starts running. If
an alarm indicator goes on after the software starts running, this indicates that
an alarm condition is present in the HCD-4 unit.
Note If a fault occurs during either downloading or decompressing, the ALM indicator on
the HCD-4 unit starts flashing. In this case, turn the HCD-4 off, then restart the
download procedure from step 1.

E-2 Cold (Local) Installation Procedure

 Appendix F
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 HCD-4 system.

F.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 F-1 illustrates the 2B1Q encoding rule.

HDSL Environment F-1

Appendix F Operating Environment HCD-4 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 F-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 2320
kbps (equivalent to a symbol rate of 1160 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 6960 quats (13920 bits). 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 synchronization word consists of 7 quats, and its function is to enable HDSL
frame alignment.
16 HDSL overhead quats are used to carry the following data:
• 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).
• Identification of the HDSL line number (seven quats). This allows the receiver
to detect unintentional interchange of pairs.

F-2 HDSL Environment

HCD-4 Installation and Operation Manual Appendix F Operating Environment

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.

HDSL Environment F-3

Appendix F Operating Environment HCD-4 Installation and Operation Manual

F-4 HDSL Environment

 Appendix G
Parameters and Terminal
Commands

G.1 Front Panel Parameters

This section lists the HCD-4 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
Control port parameters SP PARAMETERS Table G-2
Channel parameters PORT PARAM Table G-3

The tables also list the parameter values included in the HCD-4 default
configuration and important practical configuration guidelines.
Note In addition to the parameters listed in the tables, HCD-4 supports other
parameters, which can be modified only via the control port. These parameters are
listed and explained in Section G.2, Control Terminal Commands.
* Parameters marked with an asterisk are not displayed when your HCD-4 is
configured as a remote unit.

Front Panel Parameters G-1

Appendix G Parameters and Terminal Commands HCD-4 Installation and Operation Manual

Table G-1. System Parameters

Designation Function Values Default Configuration Guidelines

CLK MASTER* Selects the master INT – Internal oscillator is selected INT For this version only INT option is
timing reference available.

HCD TYPE Displays HCD-4 CENTRAL – HCD-4 configured as central unit

configuration
REMOTE – HCD-4 configured as remote unit
mode
CONFIG REM* Controls the YES – Enables the downloading function. The configuration YES
downloading values selected for HCD-4 configured as central unit
function are downloaded to the unit configured as remote,
and determine the remote unit operating mode.

NO – Disables the downloading function

REM TYPE Displays remote HCD-4
unit type

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, replacing the locally-modified parameters. To prevent this, make sure that section 3 (DB INIT) of the HCD-4 Setup DIP
switch of the unit configured as central is set to OFF (refer to Setting the Jumpers and Switches in Chapter 2).

G-2 Front Panel Parameters

HCD-4 Installation and Operation Manual Appendix G Parameters and Terminal Commands

Table G-2. Control Port Parameters

Designation Function Values Default Configuration Guidelines

DATA Selects the number of 7 or 8 data bits. 8 Ensure that the number of data bits is the
data bits same as on the terminal.
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 NO
8 data bits)
INTERFACE Selects control port DCE – HCD-4 operates as a DCE for the control DCE Select DCE when directly connected to the
interface terminal. control terminal.
DTE – HCD-4 operates as a DTE, for connection Select DTE when connected to a modem.
via modem to the control terminal.

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 TERMINAL
mode supported by the supervision terminal.
HCD-4 control port DIAL-OUT – The control port is used as a dial-out
port.
NONE – Not in use
Note: Several additional control port parameters can only be configured from a control terminal. These parameters are configured using the DEF SP or DEF
CONTROL command. For details, refer to Section G.2, Parameters and Terminal Commands.

Front Panel Parameters G-3

Appendix G Parameters and Terminal Commands HCD-4 Installation and Operation Manual

Table G-3. Channel Parameters

Designation Function Values Default Configuration Guidelines

SPEED Selects the channel Available data rates are multiples of the basic 4096
payload data rate. For a rate (64 kbps). The multiples are in the range of
channel with Ethernet 1 to 32, resulting in rates of 64, 128, 192, ...,
interface, selects the 2048 kbps, 4096 kbps.
transfer rate through the
HDSL link.
CTS Selects the state of the ON – CTS continuously on ON For polled applications, select =RTS.
CTS line in the user data
=RTS – CTS line follows the RTS line
channel interface (not
relevant for the IR-ETH,
IR-IP and IR-ETH/QH
interfaces)
ETHER Selects the Ethernet LAN HALF – Half duplex operation HALF
(appears only traffic transfer mode
FULL – Full duplex operation
when data
channel has
Ethernet
interface)
BRIDGING Selects the Ethernet FILTERED – The internal bridge of HCD-4 is FILTERED FILTERED mode is recommended.
(appears only traffic control function enable, and filters the traffic
when data transferred to the remote end
channel has TRANS – The internal bridge of HCD-4 is
Ethernet disabled, and the Ethernet traffic is
interface) transparently transferred

G-4 Front Panel Parameters

HCD-4 Installation and Operation Manual Appendix G Parameters and Terminal Commands

G.2 Control Terminal Commands

This section describes the HCD-4 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
X Identifies the HDSL line (1 for line 1, 2 for line 2)

CLR ALM (CA)

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>
HCD-4 performs the command and displays the date and time, followed by the
HCD-4> prompt. If you used the /A option and no alarm condition currently
exists, the ALM LED goes off.

CLR ALM REM (CA R)

Purpose
Clear the remote unit alarm buffer.

Syntax
CLR ALM REM [/A]

Control Terminal Commands G-5

Appendix G Parameters and Terminal Commands HCD-4 Installation and Operation Manual

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>
HCD-4 performs the command and displays the date and time, followed by the
HCD-4> prompt. If you used the /A option and no alarm condition currently
exists in the remote unit, its ALM LED goes off.

CLR LOOP
(Mnemonics are listed below in Use section)

Purpose
Deactivate the specified user-initiated loopback or test.

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

Use
• To deactivate a local (L) loopback on the HDSL line, enter:
CLR LOOP L LINE<Enter> or CLR LP L LINE<Enter> or
CLM<Enter>
This loopback can only be performed from the unit configured as central.
• To deactivate the local (L) loopback on the data channel of local HCD-4,
enter:
CLR LOOP L CH<Enter> or CLR LP L CH<Enter> or CL<Enter>
• To deactivate the remote (R) loopback on data channel of local HCD-4, enter:
CLR LOOP R CH<Enter> or CLR LP R CH<Enter> or CR<Enter>
• To deactivate the remote (R) loopback on data channel of the remote unit,
enter:
CLR LOOP R R CH<Enter> or CLR LP R R CH<Enter> or
CRR<Enter>
HCD-4 performs the command and displays the date and time, followed by the
HCD-4> prompt. If there are no more tests activated, the TST LED goes off.
Note If no test or loopback of this type is currently activated, HCD-4 displays ERROR 02
on the terminal.

G-6 Control Terminal Commands

HCD-4 Installation and Operation Manual Appendix G Parameters and Terminal Commands

CLR TST (CT)

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>
HCD-4 performs the command and displays the date and time, followed by the
HCD-4> prompt. The TST LED goes off.
Note If no test or loopback is currently activated, HCD-4 displays ERROR 02 on the
terminal.

DATE
Purpose
Set the date for the HCD-4 internal real-time clock.
Syntax
DATE
Use
1. Enter:
DATE<Enter>
HCD-4 sends the entry line for the first parameter:
DAY [2 DIGITS] = 01

2. Press <Enter> to accept the current parameter value and continue to the next
line. Type in the new date, then press <Enter> to confirm the new value.
HCD-4 displays the entry line for the next parameter.
3. Repeat the procedure in step 2 to set the month; HCD-4 displays the entry
line for the year.
4. Enter the four digits of the current year; HCD-4 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; HCD-4 displays the new date and time,
followed by the HCD-4> prompt. A typical display, as seen after all the
parameters are selected, is shown below:
DAY [2 DIGITS] = 3
MONTH [2 DIGITS] = 3
YEAR [4 DIGITS] = 2000
WEEK DAY = FRI

Control Terminal Commands G-7

Appendix G Parameters and Terminal Commands HCD-4 Installation and Operation Manual

DEF ALM MASK (DA)

Purpose
Display and modify alarm masks (masked alarms are not reported).
Alarm masks let you disable alarm generation by unused ports, alarm generation
during maintenance, etc.

Syntax
DEF ALM MASK

Use
1. To define alarm masks, enter the following:
DEF ALM MASK<Enter>
HCD-4 displays the first line of the alarm masks data form. This line lets
you select the group of alarms to be processed. A typical form is shown
below:
GROUP ALL
SYSTEM NORMAL

The parameter options appear in Table G-4:

Table G-4. Alarm Mask Parameters

Designation Function Values Default

GROUP Selects the group of alarms to be SYSTEM –System alarms SYSTEM
processed.
HDSL – HDSL alarms
CH – Data channel alarms
ALL Enables the masking of all MASK – All alarms in a specified group are
alarms. masked.
USER – You can define the individual USER
alarms to be masked.
NORMAL – None of the alarms in the
specified group are masked.

2. Use the spacebar to move to the desired field. Press <Enter> to accept the
current parameter value and continue to the next field. Press <F> or <B> to
scroll among the values, then press <Enter> to confirm the new value.
If you select MASK or NORMAL for ALL, press <Enter> to end.
If you select USER, select the desired group of alarms, then press <Enter>
to display the group of alarms to be processed. A typical display is shown
below:
ALARM NUMBER & DESCRIPTION MASKED
01 DB CHECKSUM ERR NO

G-8 Control Terminal Commands

HCD-4 Installation and Operation Manual Appendix G Parameters and Terminal Commands

The parameter options appear in Table G-5.

Table G-5. Alarm Masks - User Selection

Designation Function Values Default

ALARM NUMBER Displays the first alarm number
& DESCRIPTION (code and description) in the
selected group.
MASKED Enables masking of the selected YES – The alarm is masked.
alarm.
NO – The alarm is not masked, and NO
will be reported when
generated.

3. Press <F> or <B> to select the desired state for the current alarm, then press
<Enter> to display the next alarm number. Repeat this procedure until you
have defined all the alarms in the selected group. When you have defined the
last alarm, HCD-4 displays the date and time followed by the HCD-4>
prompt.
DEF CALL (DO)

Purpose
Define the call-out parameters for the HCD-4 control port when it is used as a
dial-out port. The call-out function is enabled from the front panel by setting the
AUX DEV parameter to DIAL-OUT. Refer to Front Panel Parameters.
The specified call-out parameters are used by HCD-4 to build the call command
that is sent to the dial-out modem. The modem connected to the CONTROL port
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>
2. HCD-4 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

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3. Press the spacebar 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. HCD-4 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’

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.
4. After entering the desired directory number, press <Enter>:
If the ALT_NUM_MODE parameter is NO (no alternate number), HCD-4
displays the date and time, followed by the HCD-4> prompt.
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’

5. When you are finished, press <Enter> to execute the new parameters.
HCD-4 displays the date and time, followed by the HCD-4> 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, HCD-4 stops the call
1-8 – If the call is not established
attempts. When a new alarm report must be
on the first attempt,
sent, the call attempts are started again. The
HCD-4 will redial the
user is notified that the call attempts failed by
specified number of
a message recorded in the alarm buffer
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, HCD-4 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).

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

Parameter Name Values Configuration Instructions

WAIT_FOR_CONNECT 30, 45, or 60 seconds This parameter specifies the time HCD-4 will
wait for an answer after each dialing attempt.
If the called station does not answer within
the specified time, HCD-4 disconnects. If
additional call attempts are allowed, the
HCD-4 will redial immediately after
disconnecting.
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, HCD-4 stops
the call attempts after the specified number of
call attempts on the primary number failed.

DEF CH (DC)

Purpose
Define the data channel parameters of the HCD-4.

Syntax
DEF CH

Use
1. Define the channel parameters as follows:
To define channel parameters, enter:
DEF CH<Enter>
HCD-4 displays the first line of the channel parameters data form. A typical
form is shown below:

SPEED CTS ETHERNET_MODE BRIDGING

4096 ON N/A N/A

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

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Table G-7 lists the available data channel configuration parameters and their
functions. The table also lists the parameter values included in the default
configuration of the channel.

Table G-7. Data Channel Parameters

Designation Function Values Default

SPEED Selects the channel payload Available data rates are multiples of the basic 4096
data rate rate (64 kbps). The multiples are in the range of
1 to 32, resulting in rates of 64, 128, 192, ...,
2048, 4096 kbps.
CTS Selects the state of the CTS ON – CTS continuously on ON
line in the data channel.
=RTS – CTS line follows the RTS line
For a channel with IR-ETH,
IR-IP or IR-ETH/QH module, N/A – Not applicable
this field always shows N/A,
and cannot be changed
ETHERNET_ Selects the Ethernet LAN HALF_DUP – Half duplex operation HALF_DUP
MODE traffic transfer mode. For a
FULL_DUP – Full duplex operation
channel with serial data
interface, this field always N/A – Not applicable
shows N/A, and cannot be
changed
BRIDGING Selects the Ethernet traffic FILTERED – The internal bridge of HCD-4 is FILTERED
control function. enabled, and filters the traffic
transferred to the remote end
For a channel with serial data
interface, this field always TRAN – The internal bridge of HCD-4 is
shows N/A. disabled, and the Ethernet traffic is
transparently transferred

DEF CONTROL
Same as DEF SP command. See DEF SP below.

DEF NAME (DNA)

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

Syntax
DEF NAME

Use
1. To define the HCD-4 logical name, enter:
DEF NAME<Enter>
HCD-4 displays the logical name entry form:

ENTER NODE NAME (MAX 8 CHARACTERS) =

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2. Enter the desired name, then press <Enter>. HCD-4 displays the following
line, where 'name' is HCD-4’s current logical name:

CURRENT NAME = 'name'

Following this line, HCD-4 displays the date and time, followed by the
HCD-4> prompt.
Note If you want to store a logical name in the database, make sure that section 3
(DB INIT) of the HCD-4 Setup DIP switch is set to OFF. Otherwise, the default
name (blank) is enforced.

DEF PWD

Purpose
Define a new user password for the HCD-4 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>; HCD-4 displays the next line:

CURRENT PASSWORD = 'password'

where 'password' is the current password. HCD-4 then displays the date and
time, followed by the HCD-4> prompt.
Note If you want to store the user-selected password, make sure that section 3 (DB INIT)
of the HCD-4 Setup DIP switch is set to OFF. To use the user-selected password, set
section 1 (PASSWD) of the Setup DIP switch to OFF. Otherwise, the default
password (HCD4) is enforced.

DEF SP (DP)

Purpose
Define the control port parameters. Refer to Table G-2 for a description of the
control port parameters and practical guidelines for their selection.

Syntax
DEF SP or DEF CONTROL

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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.

DATA PARITY INTERFACE CTS DCD_DEL DSR POP_ALM

8 NO DCE =RTS 0_MS ON NO

2. To change the parameter values, press the spacebar 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.

PWD LOG_OFF AUXILIARY DEVICE CALL_OUT_MODE

NO NO TERMINAL NONE

4. After you select the desired parameter values, press <Enter> to execute the
new parameters. HCD-4 displays the date and time, followed by the HCD-4>
prompt.

Parameters Programmable from the Terminal

In addition to the control port parameters listed in Front Panel Parameters, the
parameters listed in Table G-8 can only be programmed from the terminal.

Table G-8. Additional Control Port Parameters

Designation Function Values

CTS Determines CTS state ON – The CTS line is always ON (active)
=RTS – The CTS line follows the RTS line
DCD_DEL With the HCD-4 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.

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Table G-8. Additional Control Port Parameters (Cont.)

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
terminal ON/OFF-type alarm changes its state to ON (see
Alarms in Chapter 5). If no such event occurs, HCD-4
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.
LOG_OFF Sets idle disconnect time NO – Automatic session disconnection disabled
10_MIN – Automatic disconnection after ten minutes if
HCD-4 receives no input
CALL_OUT_ Controls the use of the call- ALL – HCD-4 initiates a call after each new alarm
MODE out function
MAJOR – HCD-4 initiates a call only when a new major
alarm appears (refer to Chapter 5).
NONE – Call-out function is disabled

Note In order for HCD-4 to use the selected parameters, verify that Section 2 (DEF SP)
and Section 3 (DB INIT) of the HCD-4 Setup DIP switch (see Setting the Jumpers
and Switches in Chapter 2) is in the OFF state (factory setting). Otherwise, HCD-4
will use the default parameters.

DEF SYS
Purpose
Assign values to system parameters.

Syntax
DEF SYS

Use
1. Enter:
DEF SYS<Enter>
HCD-4 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, see

Table G-1.
Note These parameter values only appear when HCD-4 is configured as a central unit
(LTU). When HCD-4 is configured as a remote unit, N/A appears instead of the
parameter values.

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2. To change the parameter values, press the spacebar 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. HCD-4 displays the date and time, followed by the HCD-4>
prompt.
DEF TERM (DT)

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 HCD-4 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.
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 HCD-4 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.
HCD-4 performs the command and displays the date and the time followed by the
HCD-4> prompt.
Note If you enter DEF TERM (without the terminal type), HCD-4 will reset all three codes
to 0.

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DSP ALM (SA)

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.

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 HCD-4 is
preceded by a header. The header lists the assigned logical name and the node
number of the HCD-4 unit which sent the alarm block, thus serving as an
easily-identified separator between alarm messages transmitted by different
HCD-4 units.
In the end, HCD-4 displays the date and time, followed by the HCD-4> prompt.
Refer to Alarms in Chapter 5 for a list of all HCD-4 alarm messages in alphabetical
order and corrective actions that you can undertake to fix the problem.

DSP ALM REM (SA R)

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]

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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>
* Refer to Alarms in Chapter 5 for a list of all HCD-4 alarm messages in
alphabetical order and corrective actions that you can undertake to fix the
problem.
The format of the remote alarm buffer display is similar to the format for the local
alarm buffer, described in the DSL ALM command above.

DSP HDR TST (SH)

Purpose
Display the results of the last hardware test of the local HCD-4. 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>
Note Use this command to reveal the cause of a SELF TEST ERROR alarm.

Display Format
The display shows NO HARDWARE FAILURE if the test is successful. Otherwise,
HCD-4 displays one of the following messages:
• FRAMER 1 FAILURE
• FRAMER 2 FAILURE
• DSP 1 FAILURE
• DSP 2 FAILURE
• XRT 1 FAILURE
• XRT 2 FAILURE
• NSFIFO FAILURE
After the message HCD-4 displays the date and time, followed by the HCD-4>
prompt.

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DSP HDSL PM (SPM)

Purpose
Display the contents of performance monitoring registers of a selected HDSL line
of the local HCD-4. 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:
To display the performance monitoring registers of HDSL line 1, type:

DSP HDSL PM LP1<CR> or DSP HDSL PM<CR>

To display the performance monitoring registers of HDSL line 2, type:
DSP HDSL PM LP2<CR>
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<CR> or DSP HDSL PM<CR>/CA

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<CR>
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 HCD-4 displays this screen only if HCD-4 has been working over 15 minutes after
power-up.

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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 R HDR TST (SHR)

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. Otherwise,
HCD-4 displays one of several possible messages, depending on the version of the
remote unit.
If the remote unit is version 3.0, HCD-4 displays one of the following messages:
• FRAMER 1 FAILURE
• FRAMER 2 FAILURE
• DSP 1 FAILURE
• DSP 2 FAILURE
• XRT 1 FAILURE
• XRT 2 FAILURE
• NSFIFO FAILURE
After the message, HCD-4 displays the date and time, followed by the HCD-4>
prompt.

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DSP R HDSL PM (SRPM)

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 (SS)

Purpose
Display status information for a specified channel.

Syntax
DSP ST CH

Use
• To display the status information for a selected channel, enter:
DSP ST CH <Enter>

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A typical channel status display is shown below:

STATUS OF CHANNEL
INTERFACE = RS530
LOOPS TYPE = REMOTE REM REM LOCAL
NO NO NO
RTS STATE = OFF

Display Format
The fields in the status information display are listed in Table G-10:

Table G-10. Channel Status Information Display Fields

Field Indicates Options

LOCAL The state of the local NO – Local loopback is deactivated
loopback
YES – Local loopback is activated
REMOTE The state of the remote NO – Remote loopback is deactivated
loopback
YES – Remote loopback is activated
REM REM The state of the remote NO – Remote remote loopback is deactivated
remote loopback
YES – Remote remote loopback is activated
RTS The state of the RTS line OFF – The RTS line is not active
in the channel connector
ON – The RTS line is active

DSP ST LINE (SSL)

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>

HCD-4 performs the command and displays the date and time followed by
the HCD-4 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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• To display the current status information for HDSL line 2, type:

DSP ST LINE 2<Enter>
HCD-4 performs the command and displays the date and time followed by
the HCD-4 prompt.
• To monitor continuously line 2 status information, type:
DSP ST LINE 2/R<Enter>
HCD-4 performs the command and displays the date and time followed by
the HCD-4> prompt.
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

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 loop is not activated
line loop on the HDSL YES – Local line loop activated
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.

DSP ST SYS (SSY)

Purpose
Display system status information.

Syntax
DSP ST SYS

Use
• To view the current system status, enter:
DSP ST SYS<Enter>
HCD-4 performs the command and displays the date and the time followed by the
HCD-4> prompt.

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Display Format
A typical status information display is shown below.

NODE = 0
NAME = 'HCD-4 name'
NODAL_CLOCK = INT
CURRENT DATA RATE = 4096
LOCAL UNIT:
CONFIGURATION = CENTRAL
DTE INT. TYPE = V35
SOFTWARE VER = 1.0
HARDWARE VER = 1.1
POWER SUPPLY AC
REMOTE UNIT:
TYPE = HCD-4
DTE INT. TYPE = V35

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

Table G-12. System Status Information Fields

Field Description
NODE The node number of the HCD-4
NAME The logical name of the HCD-4 (if you have defined it with
the DEF NAME command)
NODAL CLOCK For a unit configured as central, indicates the current source
for the HCD-4 system clock: INT.
For a unit configured as remote, always shows LBT CLOCK.
CURRENT DATA RATE Current data rate of HCD-4
LOCAL UNIT
CONFIGURATION The function of the local HCD-4: CENTRAL or REMOTE
SOFTWARE VER HCD-4 software version
HARDWARE VER HCD-4 hardware version
POWER SUPPLY Shows the HCD-4 power supply: AC or DC.
DTE INT. TYPE Shows the data channel interface type of the local HCD-4
REMOTE UNIT
TYPE The type of unit at the remote end of the HDSL link
DTE INT. TYPE Shows the data channel interface type of the remote HCD-4

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EXIT

Purpose
End the current session and return control to the HCD-4 front panel.

Syntax
EXIT

Use
• Enter:
EXIT<Enter>
HCD-4 executes the command and displays the date and the time followed by the
HCD-4> prompt.

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

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Use
1. To display the current codes, enter:
F<Enter>
The terminal function entry screen is displayed. The screen includes three
separate lines, displayed one after the other. A typical screen, showing all
three lines, is shown below:
CLEAR SCREEN = hhhhhhhh
CURSOR HOME = hhhhhhhh
CURSOR RIGHT = hhhhhhhh

where h indicates hexadecimal digits.

2. To change a code, press <Enter> to bring the cursor under the first digit of
the code to be changed, then enter the appropriate hexadecimal digits of the
code.
3. Repeat the procedure until all the necessary codes are changed.
HCD-4 executes the command and displays the date and the time followed by the
HCD-4> prompt.

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>
HCD-4 displays the first HELP page. Press any key to display the next page.
When finished, HCD-4 displays the date and the time followed by the HCD-4>
prompt.
INIT DB
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

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Use
• Enter:
INIT DB<Enter>
This command loads the default parameters and resets the HCD-4.
Note This command causes HCD-4 to initialize; therefore traffic through the HCD-4 will
be disrupted until HCD-4 returns to normal operation. After the INIT DB command
is executed, you may need to reconfigure the HCD-4 unit.

Table G-14. HCD-4 Default Configuration

Parameter Type Parameter Designation Default Value

General PASSWORD HCD4
NODE (node number) 0
CLEAR SCREEN 1B5B324A
CURSOR HOME 1B5B4800
CURSOR RIGHT 1B5B3143
SYSTEM CLK_MASTER INT
CONFIG REM YES
SP (control port) SPEED 9600
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
CH SPEED 4096
CTS ON
ETHERNET MODE N/A
BRIDGING N/A

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

Control Terminal Commands G-27

Appendix G Parameters and Terminal Commands HCD-4 Installation and Operation Manual

Use
• Enter:
INIT F<Enter>
HCD-4 executes the command and displays the date and the time followed by the
HCD-4> prompt.
LOOP

Purpose
Activate a user-controlled loopback on HCD-4. Refer to Diagnostic Tests in
Chapter 5 for a description of HCD-4’s loopbacks.

Syntax
LOOP [loop type]

Use
• To activate a loopback, enter the appropriate command. The commands
depend on the loopback type, on the channel or link for the loop to be
performed on, and on the type of unit working opposite your HCD-4.
Table G-15 lists the available loopback commands.

HCD-4 executes the requested command and displays the date and time,
followed by the HCD-4> prompt.

Table G-15. Loopback Commands

To activate Enter
A local (L) loopback on the HDSL lines (only from the unit LOOP L LINE or LP L LINE or LLM
configured as central)
A local (L) loopback on data channel of local HCD-4 LOOP L CH or LP L CH or LL
A remote (R) loopback on data channel of local HCD-4 LOOP R CH or LP R CH or LR
A remote (R) loopback on data channel of remote unit LOOP R R CH or LP R R CH or LRR

RESET

Purpose
Reset HCD-4. This command causes HCD-4 to initialize; therefore traffic through
HCD-4 will be disrupted until HCD-4 returns to normal operation.

Syntax
RESET

Use
• To reset HCD-4, enter:
RESET<Enter>

G-28 Control Terminal Commands

HCD-4 Installation and Operation Manual Appendix G Parameters and Terminal Commands

TIME

Purpose
Set the time for the HCD-4 internal real-time clock.

Syntax
TIME

Use
1. Enter:
HCD-4 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. HCD-E1 displays the entry line for the minutes.
3. Repeat the procedure in step 2 to set the minutes; HCD-4 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 [2 DIGITS] = 12
MINUTE [2 DIGITS] = 25
SECOND [2 DIGITS] = 16

HCD-4 displays the date and time (note that the time has changed),
followed by the HCD-4> prompt.

Control Terminal Commands G-29

Appendix G Parameters and Terminal Commands HCD-4 Installation and Operation Manual

G-30 Control Terminal Commands

 Index

—A— DEF CONTROL, G-12

Alarm list DEF NAME, G-12
ALARM BUFFER OVERFLOW, 5-3 DEF PWD, G-13
DB CHECKSUM ERROR, 5-3 DEF SP, G-13
DB-INIT SWITCH IS ON, 5-3 DEF SYS, G-15
DP ALTERNATE CALL FAILED, 5-3 DEF TERM, G-16
DP DIAL CYCLE FAILED, 5-3 DSP ALM, G-17
DP PRIMARY CALL FAILED, 5-4 DSP ALM REM, G-17
DTE NOT CONNECTED TO CH, 5-4 DSP HDR TST, G-18
HDSL TIMING OVERFLOW, 5-6 DSP HDSL PM, G-19
LOCAL CRC ALM LP1-2, 5-4 DSP R HDR TST, G-20
LOOPS ARE INVERTED, 5-4 DSP R HDSL PM, G-21
PASSWORD SWITCH IS ON, 5-4 DSP ST CH, G-21
RATE DECREASED, 5-4 DSP ST LINE, G-22
REMOTE CRC ALM LP1-2, 5-5 DSP ST SYS, G-23
SELF TEST ERROR, 5-5 EXIT, G-25
SIGNAL LOSS LP1-2, 5-5 F, G-25
SP-PAR SWITCH IS ON, 5-5 Help, G-26
STUFFING OVERFLOW, 5-5 INIT DB, G-26
SYNC LOSS LP1-2, 5-6 INIT F, G-27
Alarms, 1-2, 3-4 LOOP, G-28
clearing, G-5 RESET, G-28
connecting relay port, 2-7 TIME, G-29
displaying, G-17 Commands
masking, 5-7, G-8 description, G-5
ON/OFF type, 5-2 entering, 4-5
ON-state, 3-7, 5-2 index of, G-26
ON-type, 5-2 options, 4-8
overview, 5-2 overview, 4-8
relay, 5-2 troubleshooting, 4-7
working with, 5-7 Configuration
ASCII terminal, 4-1 default, 3-2, G-26
initial, 4-1, 4-10
—B— parameters, 3-4, 3-7, G-1
procedure, 3-9
Buttons, 3-2, 3-5
setup, 3-8
Connector
—C— alarm relay, A-1
Circuit boards, 2-2 control port, A-5
Clear to Send. See CTS data channel, A-1
Clearance, 2-1 HDSL, A-1
Command list IR-ETH, B-1
ALM REM, G-5 IR-ETH/QH, D-1
CLR ALM, G-5 IR-IP, C-4
CLR LOOP, G-6 RS-530, A-2
CLR TST, G-7 V.35, A-3, A-4
DATE, G-7 Control language, 4-8
DEF ALM MASK, G-8 Control lines, 1-4
DEF CALL, G-9 Control port
DEF CH, G-11 configuring, G-12, G-13, G-14

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Index HCD-4 Installation and Operation Manual

connector, A-5 HDSL, 1-1, 1-4

interface, 2-7, 4-1 connector, A-1
Control sequences, G-16 line interface, 2-7
Control terminal codes, G-16 status, 1-2
CTS, 4-3
Cursor button, 3-2, 3-5 —I—
Installation, 2-2
—D— Interface connections, 2-6
Data Carrier Detect. See DCD IR-ETH
Data channel connector, B-1
connecting, 2-7 connector pinout, B-2
connector pinout, A-1 DIP switch settings, B-3
interface board, 2-2 LAN installation, B-4
parameters, G-11 layout, B-3
specifications, 1-7 LEDs, B-4
Data Set Ready. See DSR Technical specifications, B-2
Data Terminal Ready. See DTR IR-ETH/QH
connecting the LAN, D-4
Date, G-7
connector, D-1
DB INIT, 2-6
DIP switch settings, D-3
DCD, 4-3 layout, D-2
DEF SP, 2-5 LEDs, D-4
Default parameters, G-26 technical specifications, D-2
Diagnostics, 5-10, 5-14 IR-IP
DIP switch, 2-5 application, C-2
DSR, 4-3 assigning IP address, C-7
DTR, 4-2 changing IP address, C-8
configuring Telnet connection, C-6, C-13
connector, C-4
—E—
default communication parameters, C-5
Enter button, 3-2, 3-5
default gateway, C-12
Errors diagnostics, C-26
detecting, 5-1 DIP switch, C-3
list of, 5-8 downloading new software releases, C-21, C-29
Ethernet erasing application software, C-28
IR-ETH module, B-1 erasing user's configuration, C-28
IR-ETH/QH module, D-1 IP learning, C-7
IR-IP module, C-1 LAN interface, C-15
Exiting control session, G-25 LEDs, C-3
management software, C-9, C-10
—F— menu map, C-10
FGND/GND jumper, 2-4 multicasting, C-19
Front panel, 3-1, 3-5, 5-1 overview, C-1
ping utility, C-26
preliminary configuration, C-5
—H—
quick setup, C-11
Handshaking protocol, 4-2
resetting, C-22
Hardware test results, G-18, G-20 technical specifications, C-2
HCD-4, 1-1 troubleshooting, C-8
configuration, 3-2 viewing configuration, C-23
front panel, 1-3 viewing error log, C-22
functional description, 1-4 viewing statistics, C-25
installation, 2-2 WAN Frame Relay parameters, C-16
management, 1-5 WAN interface, C-12, C-15, C-16
physical description, 1-3 WAN PPP parameters, C-17
power off, 3-8
power on, 3-6
—J—
rear panel, 1-3
Jumpers, 2-2
remote management, 1-5
technical specifications, 1-7

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HCD-4 Installation and Operation Manual Index

—L— connection, 2-8

LCD, 1-3, 3-2, 3-4, 3-7, 5-2, 5-7 on, 3-6
LEDs, 1-2, 3-1, 3-8, 5-1 source, 2-1
Line Terminal Unit. See LTU Power-up self test, 5-1
Logical name, 4-11 Printed circuit boards, 2-2
Loopbacks
activating, G-28 —R—
clearing, G-6, G-7 Request to Send. See RTS
general, 3-4, 5-14 Resetting HCD-4, G-28
LOOP L CH, 5-16 Resetting terminal control codes, G-27
LOOP L LINE, 5-16 RI, 4-3
LOOP R CH, 5-17 Ring Indication. See RI
LOOP R R CH, 5-17 RS-530 interface connector, A-2
LTU, 1-1, 1-6 RTS, 4-3
—M— —S—
Main circuit board, 2-2 Scroll button, 3-2, 3-5
Management Self-test, 3-6, 5-1
remote, 1-5
Site requirements, 2-1
supervision terminal, 1-5
Stacking, 2-1
Modem, 4-2
Statistics, 5-10
Multidrop operation, 4-11
Status
channel, G-21
—N—
line, G-22
Network Terminal Unit. See NTU system, G-23
Node name, G-12 Status messages, 3-4
Node number, 4-11 Switches, 2-2
NTU, 1-1 System parameters, G-2, G-15
System status, G-23
—P—
Parameters —T—
control port, G-13, G-14
Temperature, 2-1
data channel, G-11
default, G-26
Terminal control codes, G-25
performance monitoring, 5-11 Time, G-29
setting, G-1 Timing, 1-6
system, G-2, G-15 Transmission rates, 1-4
viewing, 3-7 Troubleshooting, 5-9
Password, 2-5, 3-9, G-13
Performance data, 5-10 —V—
Performance monitoring, 5-11, G-19, G-21 V.35 interface connector, A-3, A-4
Power Voltage, 2-1

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Index HCD-4 Installation and Operation Manual

I-4