AT&T MERLIN LEGEND Release 2.0 Analog Multiline... Betriebsanleitung

AT&T

AT&T 555-620-143

Issue 1

October 1992

MERLIN LEGENDTM

Communications System

Release 2.0

Maintenance and Troubleshooting

Printed in U.S.A. October 1992

Notice

Every effort was made to ensure that the information in this book was complete and

accurate at the time of printing. However, information is subject to change.

Federal Communications Commission (FCC)

Electromagnetic Interference Information

This equipment has been tested and found to comply with the limits for a 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 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.

Canadian Department of Communications (DOC)

Interference Information

This digital apparatus does not exceed the Class A limits for radio noise emissions set

out in the radio interference regulations of the Canadian Department of Communications.

Le Présent Appareil Numérique n’émet pas de bruits radioélectriques dépassant Ies

Iimites applicable aux appareils numériques de la class A prescribes clans Ie Réglement

sur Ie brouillage radioélectrique édicté par Ie ministére des Communications du Canada.

Trademarks

Magic On Hold and Megacom are registered trademarks, and MERLIN LEGEND,

MLX-10, MLX-10D, MLX-20L, and MLX-28D are trademarks of AT&T in the U.S. and other

countries.

Phillips is a registered trademark of the Phillips Screw Company.

UNIX is a registered trademark of UNIX System Laboratories, Inc.

Support Telephone Number

AT&T provides a toll-free customer Helpline (1-800-628-2888) 24 hours a day

(U.S.A. only). Call the Helpline, or your authorized dealer, if you need assistance when

installing, programming, or using the system.

Contents

About This Book

■

Intended Audience

■

Conventions

■

Product Safety Labels 3

■

Related Documents

■

How to Comment on This Document

Introduction to System Maintenance

1-1

■ Equipment

1-1

■ Maintenance Strategy

1-15

■ Unit Loads

1-25

Error Logs, the Access Log, and System

Inventory

2-1

■

Error Logs

2-1

■

Access Log for Maintenance and System Programming

2-21

■

System Inventory

2-22

Telephone Problems

3-1

■

Telephone Troubleshooting

3-2

■

Fixing Telephone Problems

3-3

■

MLX Telephone Tests

3-9

Contents i

Contents

Control Unit Problems

4-1

■

Power Supply Problems

4-2

Processor Problems

4-13

Module Problems

4-22

100D Module Problems

4-51

Carrier Problems

4-62

Checking System Status and Slot Status

4-64

Central Office Problems

5-1

■ Trunk Errors

5-1

■ Checking Ports

5-7

System Numbering Forms

A-1

■

Form 2a, System Numbering—Station Jacks

A-2

■

Form 2b, System Numbering—Digital Adjuncts

A-4

■

Form 2c, System Numbering—Trunk Jacks

A-5

■

Form 2d, System Numbering—Special Renumbers

A-6

Unit Load Calculation Worksheet

B-1

■ Unit Load Worksheet

B-2

ii Contents

Contents

GL Glossary

GL-1

Index

l-1

Contents iii

Contents

Figures

Introduction to System Maintenance

Figure 1-1.

Removing the Control Unit Housing

1-4

Figure 1-2.

Installing the Control Unit Housing

1-6

Figure 1-3.

Setting up the MLX-20L Telephone

1-8

Figure 1-4.

Setting up the PC

1-10

Figure 1-5. Remote Modem Setup

1-11

Figure 1-6.

Maintenance Strategy

1-20

Control Unit Problems

Figure 4-1.

Power Supply Interlocking Post

4-4

Figure 4-2.

Replacing a Ring Generator

4-6

Figure 4-3.

Replacing an Auxiliary Power Unit

4-10

Figure 4-4. Module Test Process

4-23

Figure 4-5. 551 T1 CSU Connection

4-53

Figure 4-6. ESF T1 CSU, DTE Loopback Switch (on Front

Panel)

4-54

System Numbering Forms

Figure A-1.

Form 2a, System Numbering—Station Jacks

A-2

Figure A-2.

Form 2b, System Numbering-Digital Adjuncts

A-4

Figure A-3.

Form 2c, System Numbering—Trunk Jacks

A-5

Figure A-4.

Form 2d, System Numbering—Special

Renumbers

A-6

Contents v

Contents

Tables

Introduction to System Maintenance

Table 1-1.

Transient/Permanent Error Thresholds

1-22

Error Logs, the Access Log, and System

Inventory

Table 2-1.

Error Codes

Telephone Problems

Table 3-1.

Troubleshooting Telephone Problems

3-2

Table 3-2. MLX Telephone Display Buttons

3-11

Control

Table 4-1.

Table 4-2.

Table 4-3.

Table 4-4.

Unit Problems

Internal Loopback Test Errors

4-38

Board Controller Test Errors

4-43

B-Channel Loopback Errors

4-47

CSU Loopback Test Errors

4-56

Central Office Problems

Table 5-1.

Troubleshooting Trunk Symptoms 5-2

Contents

vii

viii

Contents

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