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

About This Book
If you press the Feature button on an
MLX display telephone, the display lists
telephone features you can select. A
programmed Auto Dial button gives you
instant access to an inside or outside
number.
Choose Ext Prog from the display screen.
To activate Call Waiting, dial *11.
Product Safety Labels
The names of fixed-feature, factory-
imprinted buttons appear in bold. The
names of programmed buttons are
printed as regular text.
Plain constant-width type indicates text
that appears on the telephone display or
PC screen.
Constant-width type in italics indicates
characters you dial at the telephone or
type at the PC,
Throughout these documents, hazardous situations are indicated by an
exclamation point inside a triangle and the word caution or warning.
A
WARNING:
Warning indicates the presence of a hazard that could cause death or
severe personal injury if the hazard is not avoided.
A
CAUTION:
Caution indicates the presence of a hazard that could cause minor
personal injury or property damage if the hazard is not avoided.
Conventions Used

About This Book
Related Documents
in addition to this book, the documents listed below are part of the
documentation set. Within the continental United States, these documents
can be ordered from the GBCS Publications Fulfillment Center by calling
1-800-457-1235.
Document Title
System Documents
555-601-110 BRI Access Button Quick Reference
555-601-111 BRI Supplemental Reference
555-601-112 BRI Provisioning and Planning
555-620-110 Feature Reference
555-620-115 Equipment and Operations Reference
555-640-141 Installation
555-620-116 Pocket Reference
555-620-111 System Programming
555-620-112 System Planning
555-620-113 System Planning Forms
Telephone User Support
555-601-110 BRI Access Button Quick Reference
555-620-122 MLX-10D, MLX-28D, and MLX-20L
Display Telephones User’s Guide
555-620-123
MLX-10D, MLX-28D, and MLX-20L
Display Telephones Quick Reference
555-620-150 MLX- 10D Display Telephone Tray Cards (6 cards)
555-620-152 MLX-28D and MLX-20L Telephone Tray Cards (5 cards)
555-620-124 MLX-10 Nondisplay Telephone User’s Guide
555-620-151
MLX-10 Nondisplay Telephone Tray Cards (6 cards)
555-620-120 Analog Multiline Telephones User’s Guide
555-620-121
Analog Multiline Telephones Quick Reference
555-620-126 Single-Line Telephones User’s Guide
555-620-127 Single-Line Telephones Quick Reference
555-620-128 MLC-5 Cordless Telephone Quick Reference
System Operator Support
555-620-134 MLX Direct-Line Consoles Operator's Guide
555-620-135 MLX Direct-Line Consoles Quick Reference
555-620-132 Analog Direct-Line Consoles Operator’s Guide
555-620-133 Analog Direct-Line Consoles Quick Reference
555-620-136 MLX Queued Call Console Operator’s Guide
555-620-137 MLX Queued Call Console Quick Reference
Miscellaneous User Support
555-620-130 Calling Group Supervisor’s Guide
555-620-131
Calling Group Supervisor’s Quick Reference
555-620-129 Data User’s Guide
Related Documents

About This Book
Document
I
Title
Software-Linked Information Products
ST-21 29-72 Vistium PV 1200 Installation Guide
ST-2129-73
Vistium PV 1200 User’s Guide
ST-2130-88
Vistium PV 1300 Installation Guide
ST-2130-89
Vistium PV 1300 User’s Guide
Documentation for Qualified Technicians
555-620-140 Installation, Programming, & Maintenance (lP&M) Binder
(consists of 555-620-141, 555-620-142, 555-620-143, and
555-620-144
555-620-141
Installation
555-620-142 System Programming & Maintenance (SPM)
555-620-143
Maintenance & Troubleshooting
555-620-144
Programming Summary
How to Comment on This Document
We welcome your comments, both good and bad. Please use the feedback form
on the next page to let us know how we can continue to serve you. If the
feedback form is missing, write directly to:
Documentation Manager
AT&T
211 Mount Airy Road
Room 2W226
Basking Ridge, NJ 07920.
How to Comment on This Document

FEEDBACK FORM
MERLIN LEGEND® BRI Communications System
Title: MERLIN LEGEND BRI Communications System Supplemental Reference
Order No.: 555-601-111 Date: October 1994
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Overview
This chapter introduces the MERLIN LEGEND® BRI Communications System. In
addition to a short discussion of Integrated Services Digital Network (ISDN) and
Basic Rate Interface (BRI), the chapter covers the basic hardware and software
requirements and the functions and features of the system. Also included are
brief descriptions of the BRI features supported by the MERLIN LEGEND BRI
system.
Overview 1-1

Overview
Introduction
To obtain faster rates and precise data, equipment must be able to transmit
digitally. Like Primary Rate Interface (PRI), BRI is a standard protocol for
accessing Integrated Services Digital Network (ISDN) services. By using BRI,
the MERLIN LEGEND Communications System can connect with the speed and
accuracy of ISDN services.
BRI lines offer the capability of voice, high-speed data, local area network
(LAN) interconnection, and video transmission (see Figure 1-1). In addition to
the standard features offered by other releases of the MERLIN LEGEND
Communications System, the MERLIN LEGEND BRI system offers the ability to
subscribe to several BRI features. Other BRI features have applications specific
to Federal Government telephone networks.
Central
Office
Line Interfaces
PRI, T1, DID, LS, GS, Tie
Figure 1-1. MERLIN LEGEND BRI Capabilities
NOTE:
The MERLIN LEGEND system does not support BRI when the MERLIN LEGEND
BRI lines are shared by ISDN stations outside the system. “Shared” means that
the same lines are connected to more than one station.
1-2 Introduction

Overview
ISDN and BRI
To understand the BRI option, the user should be familiar with the Integrated
Services Digital Network (ISDN) and the Basic Rate Interface (BRI).
ISDN
The Integrated Services Digital Network (ISDN) is a digital network interface
used worldwide for the transmission of voice, data, video, and other services
simultaneously over standard telephone wires. It is the leading standard in the
world for digital transmission.
With ISDN, a user can talk on the telephone while receiving and sending faxes
or data. Because it is digital, ISDN has faster and more accurate data
transmission, calling information, and more reliable establishment of calls. ISDN
is excellent for video, teleconferencing, and telemarketing.
BRI
Basic Rate Interface (BRI) is a protocol within the ISDN standard. Because it is
a station-side protocol, BRI also offers access to other groups of services, such
as central office (CO) Transfer and Local Area Signaling Services (LASS)
features, which are described later.
While a Primary Rate Interface (PRI) line consists of 23 bearer channels (B-
channels) and one data channel (D-channel), a BRI line has two B-channels and
one D-channel. The B-channels carry the user information (including data), and
the D-channel controls the B-channel communication and initializes ISDN lines.
Each B-channel on a BRI line has a capacity of 64 Kbps, and each D-channel
has a capacity of 16 Kbps. (See Figure 1-2.)
o
D
o
D
00
BB
PRI BRI
23B + D
2B+D
Figure 1-2. PRI vs. BRI
ISDN and BRI 1-3

Overview
System Overview
A MERLIN LEGEND BRI system has specific requirements and components
different from a standard MERLIN LEGEND system.
Hardware and Software Requirements
A MERLIN LEGEND system must have an 800 CO-BRI module to connect to
BRI facilities. This module is the interface that connects BRI lines from a 5ESS®
G8 central office to the MERLIN LEGEND system. In addition, the Processor
module must contain the 2. B Feature module.
NOTE:
If a new MERLIN LEGEND BRI system has been purchased, the 2.B Feature
module already resides in the Processor module. If a MERLIN LEGEND system
is upgraded to a MERLIN LEGEND BRI system, the 2.B Feature module must
be installed in the existing Processor module. (See “installing the 2.B Feature
Module” in Chapter 2.)
The MERLIN LEGEND BRI system supports connectivity to a 5ESS Custom
Central Office switch servicing the AT&T Custom BRI protocol. The 5ESS central
office (CO) must be running 5ESS Generic 8 Custom (5E8) or later software.
The MERLIN LEGEND system must be a base of Release 2.0 or higher to be
upgraded to MERLIN LEGEND BRI software release 2.B, and to operate
properly with an 800 CO-BRI module. However, a 2.B Feature module can be
used in a Release 1.0 Processor module if the Release 1.0 software is
upgraded by using the Convert utility of the System Programming and
Maintenance (SPM) software.
Ordering BRI Lines
BRI services and features ordered by the customer are configured into a
package by the CO. This package is called a User Service Order Profile
(USOP). A USOP contains the information needed to provide BRI service from
the CO to the MERLIN LEGEND system.
Along with a USOP, the CO provides up to two Service Profile Identifiers
(SPIDs) to each BRI line, or Digital Subscriber Line (DSL), coming into the
MERLIN LEGEND system at the time of subscription. A SF’ID associates a line
on the system with a USOP. The MERLIN LEGEND line’s Directory Number is
usually a subset of the SPID.
1-4 System Overview

Overview
Also at the time of subscription, the type of terminal configuration, in this case
Type D, is specified. Although the 5ESS Generic 8 Custom (5E8) software
supports two types of services over BRI lines (Point-to-Point and Point-to-
Multipoint), the MERLIN LEGEND system only supports Point-to-Multipoint.
800 CO-BRI Module
The 800 CO-BRI (Central Office-Basic Rate Interface) module is the MERLIN
LEGEND system interface to BRI lines from the central office. At least one 800
CO-BRI module must be in the system for the system to be connected to BRI
lines. Up to five 800 CO-BRI modules can be placed in a system (or any
combination of line modules up to the system maximum of 80 lines).
Because of limitations with the 391A, 391A 1, and 39IA2 power supplies,
the number of 800 CO-BRI modules plus 100D modules cannot exceed
three per carrier.
Each 800 CO-BRI module has eight ports; each port supports two MERLIN
LEGEND lines, for a total of 16 lines per module (see Figure 1-3).
Figure 1-3. 800 CO-BRI Module
System Overview 1-5

Overview
Each BRI line, called a Digital Subscriber Line (DSL), coming into the MERLIN
LEGEND system contains two Directory Numbers (DNs), one for each B-
channel. Usually the Directory Number is the number that is dialed to reach the
destination.
The MERLIN LEGEND system maps the Directory Number (DN) to a line
number in the Dial Plan. For example, if the 800 CO-BRI module is the first
module in the system, DN1 is mapped to Line 801, the first line in the MERLIN
LEGEND system. DN2 is mapped to 802, and soon for each DN (see Figure 1-
4). A telephone with Line 801 rings any time a call arrives to DN1. Subsequent
calls to the same DN can be handled by the 5ESS Multi-Line Hunt Group
feature (if the user has subscribed to this feature).
Figure 1-4. Directory Number Mapping
Every BRI line physically plugged into a port on an 800 CO-BRI module equates
to two MERLIN LEGEND lines. This is similar to the way one physical PRI line
plugged into a 100D module becomes 23 lines on the MERLIN LEGEND
system.
1-6 System Overview