AT&T MERLIN LEGEND Service manual

AT&T
MERLIN LEGEND
®
Communications System
Basic Rate interface
Supplemental Reference

Copyright © 1994, AT&T AT&T 555-601-111
All Rights Reserved Issue 1
Printed in U.S.A. October 1994
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.
See Appendix B, “Customer Support Information,” for important information.
Security of Your System: Preventing Toll Fraud
As a customer of a new telephone system, you should be aware that there exists an increasing problem of telephone toll
fraud. Telephone toll fraud can occur in many forms, despite the numerous efforts of telephone companies and
telephone equipment manufacturers to control it. For Important information regarding your system and toll fraud, see
Appendix B, “Customer Support Information. ”
Federal Communications Commission Statement
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. For further FCC information, see Appendix B,
“Customer Support Information.”
Trademarks
5ESS, MERLIN, MERLIN LEGEND, MLX-10, MLX-10D, MLX-20L, MLX-28D, and Magic On Hold are registered
trademarks; AUDIX Voice Power, FAX Attendant System, HackerTracker, MERLIN MAIL, PassageWay, PictureTel, and
Vistium are trademarks of AT&T in the U.S. and other countries.
Ordering Information
The ordering number for this document is 555-601-111. To order this document, call the AT&T GBCS Publication
Fulfillment Center at 1-800-457-1235 or fax your request to 1-800-457-1764. For more information about AT&T
documents, refer to the section entitled, “Related Documents” in “About This Book. ” The Pocket Reference, listed in that
section, provides full ordering information for replacement parts, accessories, and other compatible equipment; or,
contact your AT&T representative.
Support Telephone Number
In the continental US., AT&T provides a toll-free customer helpline 24 hours a day. Call the AT&T Helpline at
1-800-628-2888 if you need assistance when installing or using your system.
Outside the continental U. S., contact your local AT&T representative.
Warranty
AT&T provides a Iimited warranty on this product. Refer to “Limited Warranty and Limitation of Liability” in Appendix B,
"Customer Support Information.”

Contents
About this Book
■ Intended Audience
xi
■ Conventions Used
xi
■ Related Documents
xii
■ How to Comment on This Document
xiv
Overview
■ Introduction
■ ISDN and BRI
■ System Overview
■ Applications
■ Modes of Operation
■ Call Handling
■ BRI Features
1-2
1-3
1-4
1-8
1-10
1-11
1-14
Equipment and Operation
■ Equipment Requirements for MERLIN LEGEND BRI System 2-2
■ 800 CO-BRI Module 2-3
■ Installation of Equipment 2-7
■ Upgrading the
■ Telephones
■ Adjuncts
■ Applications
MERLIN LEGEND System
2-9
2-13
2-14
2-15
Features
■ All-Call Privacy/Per-Call Privacy 3-2
■ Automatic Callback 3-6
■ Automatic Recall 3-10
■ Calling Party Number/Billing Number 3-13
■ CO Transfer 3-15
■ Customer Originated Trace
■ Multi-Level Precedence and Preemption (MLPP) 3-23

Contents
Planning
■ Planning Overview
4-1
■ System Planning Forms 4-2
■ Control Unit Planning 4-5
■ Line Connections 4-7
■ Line Options 4-8
■ Assigning Telephone Buttons 4-16
■ Features 4-17
System Programming
■ Basic Programming Considerations 5-2
■ Service Profile Identifier (SPID) 5-3
■ Clock Synchronization 5-6
■ BRI Timers 5-10
■ BRI Access Button 5-13
■ System Programming Reports 5-19
Maintenance
■ BRI Maintenance 6-2
■ Accessing Maintenance Screens 6-3
■ Demand Tests 6-4
■ BRI Module and Clock Synchronization 6-13
■ Port Screens — Digital Subscriber Lines 6-16
■ Error Logs and Error Messages 6-18

Contents
APlanning Forms
A-1
B Customer Support Information
B-1
AB
Abbreviations AB-I
GL
Glossary
GL-1
IN
Index IN-I

Figures
Overview
1-1
1-2
1-3
1-4
1-5
MERLIN LEGEND BRI Capabilities 1-2
PRI VS. BRI
1-3
800 CO-BRI Module 1-5
Directory Number Mapping 1-6
Placement of BRI Access Button on an MLX Telephone 1-7
Equipment and Operation
2-1 800 CO-BRI Module 2-4
2-2 LEDs on an 800 CO-BRI Module 2-5
2-3 Installing the 800 CO-BRI Module 2-8
2-4 Installing the 2.B Feature Module 2-10
Features
3-1 MLX Display Telephone Calling Party Number Information 3-14
System Programming
5-1 BRI Information Report 5-19

Tables
Equipment and Operation
2-1
2-2
2-3
2-4
800 CO-BRI Module Specifications 2-3
800 CO-BRI Module LEDs 2-5
Pin Assignments for 8-Position Jack on an
800 CO-BRI Module 2-6
800 CO-BRI Module LEDs 2-5
Planning
4-1 System Planning Forms Needed for BRI Planning 4-3
4-2 Timers 4-12
System Programming
5-1 BRI Timer Settings 5-3
5-2 Timers 5-12
Maintenance
6-1 Error Conditions
6-2 BRI Error Messages 6-19
6-24

Safety
The exclamation point in an equilateral triangle is
intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in
the literature accompanying the product.
IMPORTANT SAFETY INSTRUCTIONS
When installing telephone equipment, always follow basic safety precautions to
reduce the risk of fire, electrical shock, and injury to persons, including:
Read and understand all instructions.
Follow all warnings and instructions marked on or packed with the
product.
Never install telephone wiring during a lightning storm.
Never install a telephone jack in a wet location unless the jack is
specifically designed for wet locations.
Never touch uninsulated telephone wires or terminals unless the
telephone wiring has been disconnected at the network interface.
Use caution when installing or modifying telephone lines.
Use only AT&T-manufactured MERLIN LEGEND Communications System
circuit modules, carrier assemblies, and power units in the MERLIN
LEGEND Communications System control unit.
Use only AT&T-recommended/approved MERLIN LEGEND
Communications System accessories.
If equipment connected to the analog extension modules (008, 408, 408
GS/LS) or to the MLX telephone modules (008 MLX, 408 GS/LS-MLX) is
to be used for in-range out-of-building (IROB) applications, IROB
protectors are required.
Do not install this product near water, for example, in a wet basement
location.
Do not overload wall outlets, as this can result in the risk of fire or
electrical shock.
The MERLIN LEGEND Communications System is equipped with a 3-wire
grounding-type plug with a third (grounding) pin. This plug will fit only into
a grounding-type power outlet. This is a safety feature. If you are unable
to insert the plug into the outlet, contact an electrician to replace the
obsolete outlet. Do not defeat the safety purpose of the grounding plug.
The MERLIN LEGEND Communications System requires a supplementary
ground.

Safety
Do not attach the power supply cord to building surfaces. Do not allow
anything to rest on the power cord. Do not locate this product where the
cord will be abused by persons walking on it.
Slots and openings in the module housings are provided for ventilation.
To protect this equipment from overheating, do not block these openings.
Never push objects of any kind into this product through module
openings or expansion slots, as they may touch dangerous voltage points
or short out parts, which could result in a risk of fire or electrical shock.
Never spill liquid of any kind on this product.
Unplug the product from the wall outlet before cleaning. Use a damp cloth
for cleaning. Do not use cleaners or aerosol cleaners.
Auxiliary equipment includes answering machines, alerts, modems, and
fax machines. To connect one of these devices, you must first have a
Multi-Function Module (MFM).
Do not operate telephones if chemical gas leakage is suspected in the
area. Use telephones located in some other safe area to report the
trouble.
WARNING:
For your personal safety, DO NOT install an MFM yourself.
ONLY an authorized technician or dealer representative shall install, set
options, or repair an MFM.
To eliminate the risk of personal injury due to electrical shock, DO NOT
attempt to install or remove an MFM from your MLX telephone. Opening or
removing the module cover of your telephone may expose you to
dangerous voltages.
SAVE THESE INSTRUCTIONS

About This Book
This document is a supplement to the standard documentation for the MERLIN
LEGEND® Communications System and provides the user with information
specific to the use of a MERLIN LEGEND Basic Rate Interface (BRI) system. This
information includes the equipment, features, programming procedures,
planning procedures, and maintenance procedures that differ from the standard
MERLIN LEGEND system.
Intended Audience
This book is intended for use as a reference by anyone needing such
information, including support personnel, sales representatives, system
managers, and users of the MERLIN LEGEND BRI system. It is also intended for
system technicians who are responsible for system installation, maintenance and
troubleshooting.
Conventions Used
Certain type fonts and styles act as visual cues to help you rapidly understand
the information presented:
Example Purpose
It is very important that you follow these Italics indicate emphasis.
steps. You must attach the wristband
before touching the connection.
The part of the headset that fits over one Italics also set off special terms.
or both ears is called a headpiece.
About This Book