AT&T MERLIN LEGEND Release 3.1 Operating instructions

AT&T 555-640-140
Issue 1
March 1996
MERLIN LEGEND®
Communications
System
Releases 3.1
and 4.0
Maintenance and
Troubleshooting

Copyright  1996, AT&T AT&T 555-640-140
All Rights Reserved Issue 1
Printed in U.S.A. March 1996
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 A, “Customer Support Information,” for important information. It follows
Maintenance and
Troubleshooting
in this binder.
Your Responsibility for Your System’s Security
Toll fraud is the unauthorized use of your telecommunications system by an unauthorized party, for example,
persons other than your company’s employees, agents, subcontractors, or persons working on your company’s
behalf. Note that there may be a risk of toll fraud associated with your telecommunications system, and if toll
fraud occurs, it can result in substantial additional charges for your telecommunications services.
You and your System Manager are responsible for the security of your system, such as programming and
configuring your equipment to prevent unauthorized use. The System Manager is also responsible for reading all
installation, instruction, and system administration documents provided with this product in order to fully
understand the features that can introduce risk of toll fraud and the steps that can be taken to reduce that risk.
AT&T does not warrant that this product is immune from or will prevent unauthorized use of common-carrier
telecommunication services or facilities accessed through or connected to it. AT&T will not be responsible for
any charges that result from such unauthorized use. For important information regarding your system and toll
fraud, see Appendix A, “
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 A, “
Customer Support Information.
”
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 les limites applicables aux
appareils numériques de la class A préscrites dans le reglement sur le brouillage radioélectrique édicté par le
ministère des Communications du Canada.
Trademarks
ACCULINK, Accunet, MERLIN, MERLIN II, MERLIN LEGEND, Magic on Hold, MultiQuest, and PARTNER are
registered trademarks and AUDIX Voice Power, FAX Attendant System, HackerTracker, MERLIN MAIL, MLX-10,
MLX-10D, MLX-10DP, MLX-16DP MLX-20L, MLX-28D, and PassageWay, are trademarks of AT&T in the U.S. and
other countries.
UNIX is a registered trademark of UNIX System Laboratories, Inc.

Ordering Information
Call: AT&T GBCS Publications Fulfillment Center
Voice 1 800 457-1235 International Voice 317 361-5353
Fax [phone] International Fax [phone]
Write: AT&T GBCS Publications Fulfillment Center
P.O. Box 4100
Crawfordsville, IN 47933
Order: Document No. AT&T 555-640-140
Comcode: 107713737
Issue 1, March 1996
For more information about AT&T documents, refer to the section entitled, “
Related Documents
”
in
“ About This
Book
.”
Support Telephone Number
In the continental U.S., AT&T provides a toll-free customer helpline 24 hours a day. Call the AT&T Helpline at
1 800 628-2888 or your AT&T authorized dealer if you need assistance when installing, programming, or using
your system. Outside the continental U.S., contact your local AT&T authorized representative.
AT&T Corporate Security
Whether or not immediate support is required, all toll fraud incidents involving AT&T products or services should
be reported
to AT&T Corporate Security at 1 800 821-8235. In addition to recording the incident, AT&T
Corporate Security is available for consultation on security issues, investigation support, referral to law
enforcement agencies, and educational programs.
AT&T Fraud Intervention
If you suspect you are being victimized by toll fraud and you need technical support or assistance, call GBCS
National Service Assistance Center at 1 800 628-2888.
Warranty
AT&T provides a limited warranty on this product. Refer to “Limited Warranty and Limitation of Liability”
in
Appendix A, “
Customer Support Information,
” which follows Maintenance and Troubleshooting in this binder.

Contents
About This Book
n Intended Audience xvii
n How to Use This Book xvii
n Terms and Conventions Used xviii
n Product Safety Labels xx
n Security xxi
n Related Documents xxii
n How to Comment on This Document xxiii
1Introduction
n Equipment 1–1
n On-Site Programming Maintenance 1–3
n Remote Programming Maintenance 1–6
n Using SPM 1–8
n Preparation for Hardware Maintenance 1–15
n Maintenance Strategy 1–18
n Unit Loads 1–26
2Error Logs, Access Logs, and System Inventory
n Error Logs 2–1
n Access Log 2–23
n System Inventory 2–25
Maintenance and Troubleshooting iii

Contents
3Telephone Problems
n Fixing Telephone Problems 3–2
n MLX Telephone Tests 3–6
n System Requirements for Touch-Tone Receivers 3–8
4Control Unit Problems
n Backing Up System Programming 4–1
n Power Supply Problems 4–2
n Processor Problems 4–12
n Module Problems 4–33
n 800 NI-BRI Module Problems 4–74
n 100D Module Problems 4–92
n Carrier Problems 4–106
n Checking System and Slot Status 4–107
5Central Office Problems
n Trunk Errors 5–1
n Checking Ports 5–8
n Conclusion of Hardware Maintenance 5–36
iv Maintenance and Troubleshooting

Contents
ACustomer Support Information
n Support Telephone Number A–
1
n Federal Communications Commission (FCC)
Electromagnetic Interference Information A–
2
n Canadian Department of Communications (DOC)
Interference Information A–
2
n FCC Notification and Repair Information A–
3
n Installation and Operational Procedures A–
5
n DOC Notification and Repair Information A–
6
n Renseignements sur la notification du ministére
des Communications du Canada et la réparation A–
8
n Security of Your System: Preventing Toll Fraud A–
11
n Limited Warranty and Limitation of Liability A–
13
n Limitation of Liability A–
15
n Voice Mail Systems A–
15
n Remote Administration and Maintenance A–
17
BSystem Numbering Forms
Form 2a, System Numbering: Extension Jacks B–
2
Form 2b, System Numbering: Digital Adjuncts B–
4
Form 2c, System Numbering: Line/Trunk Jacks B–
5
Form 2d, System Numbering: Special Renumbers B–
6
Maintenance and Troubleshooting v

Contents
C Unit Load Calculation Worksheet
Unit Load Worksheet C–2
DBacking Up with a Memory Card
n Card Types D–2
n Memory Card Formatting D–5
n Backup D–7
n Automatic Backup D–11
n Restore D–18
EModifying a Release 2.1 or Earlier Processor
for Key Mode
FNI-1 BRI Provisioning
n AT&T 5ESS Switch Translations F–2
n Northern Telecom DMS-100 Switch Translations F–20
n Siemens SSC EWSD Switch Translations F–32
vi Maintenance and Troubleshooting

Contents
GL Glossary GL-1
IN Index IN-1
Maintenance and Troubleshooting vii

Figures
1Introduction
1–
1. Setting Up the MLX-20L Console 1
–4
1–
2. Setting Up the PC 1
–5
1–
3. External Modem Setup 1
–7
1–
4. The SPM Display 1
–12
1–
5. Removing the Control Unit Housing 1
–16
1–
6. Disconnecting AC Power 1
–17
1–
7. Maintenance Strategy 1
–18
4Control Unit Problems
4–
2. Replacing a Ring Generator 4
–7
4–
3. Replacing an Auxiliary Power Supply 4
–9
4–
4. Inserting a Memory Card 4
–21
4–
5. Replacing the Feature Module 4
–32
4–
6. Module Test Process 4
–35
4–
7. Inserting the Upgrade Memory Card 4
–65
4–
8. 551 T1 CSU Loopback Connection 4
–94
4–
9. ESF T1 CSU DTE Loopback Connection 4
–95
4–
10. Acculink 3150 CSU Front Panel 4
–95
4–
11. Acculink 3150 CSU DTE Loopback Commands 1 4
–96
4–
12. Acculink 3150 CSU DTE Loopback Command 2 4
–96
4–
13. Acculink 3150 CSU DTE Loopback Command 3 4
–97
4–
14. Acculink 3150 CSU DTE Loopback Command 4 4
–97
viii Maintenance and Troubleshooting

Figures
5Central Office Problems
5–
1. Installing the Control Unit Top Cover (Release 2.1
and Later) 5–38
5–
2. Installing the Control Unit Front Cover (Release 2.1
and Later) 5–39
5–
3. Assembling the Control Unit Housing (Release 2.0
and Earlier) 5–41
5–
3. Installing the Control Unit Housing (Release 2.0
and Earlier) 5–42
BSystem Numbering Forms
B–1. Form 2a, System Numbering: Extension Jacks B–
2
B–2. Form 2b, System Numbering: Digital Adjuncts B–
4
B–3 Form 2c, System Numbering: Line/Trunk Jacks B–
5
B–4 Form 2d, System Numbering: Special Renumbers B–
6
DBacking Up with a Memory Card
D–
1. PCMCIA Memory Card D
–3
D–
2. Inserting the Memory Card D
–4
EModifying a Release 2.1 or Earlier Processor
for Key Mode
E–1. Modifying the Processor for Key Mode E–2
E–2. Installing the Control Unit Housing E–5
Maintenance and Troubleshooting ix

Tables
1Introduction
1–
1. Function of PC Keys in SPM 1
–13
2Error Logs, Access Logs, and System Inventory
2–
1. Transient/Permanent Error Thresholds 2
–2
2–
2. Error Codes 2
–6
3Telephone Problems
3–
1. Troubleshooting Telephone Problems 3
–2
3–
2. MLX Telephone Display Buttons 3
–8
3–
3. TTRs Required by VMS 3
–9
3–
4. System Requirement for TTRs 3
–10
3–
5. Modules with TTRs 3
–10
4Control Unit Problems
4–
1. PEC and Apparatus Codes for 012 Modules 4
–5
4–
2. Codes Displayed on the Error/Status Display
During Forced Installation of System Software 4–26
4–
3. Internal Loopback Test Errors 4
–51
4–
4. Board Controller Test Errors 4
–55
4–
5. Channel Loopback Errors 4
–60
4–
6. NI BRI Provisioning Test Errors 4
–78
x Maintenance and Troubleshooting

Tables
4Control Unit Problems (continued)
4–
7. NI-BRI Test Result Codes 4
–80
4–
8. Internal Loopback Test Errors 4
–100
5Central Office Problems
5–
1. Troubleshooting Trunk Symptoms 5
–2
Maintenance and Troubleshooting xi

Tables
xii Maintenance and Troubleshooting

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.
Maintenance and Troubleshooting xiii

Safety
■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.
■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.
xiv Maintenance and Troubleshooting

Safety
!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
Maintenance and Troubleshooting xv

Safety
xvi Maintenance and Troubleshooting

About This Book
The MERLIN LEGENDCommunications System is an advanced digital
switching system that integrates voice and data communications features.
Voice features include traditional telephone features, such as Transfer and
Hold, and advanced features, such as Group Coverage and Park. Data
features allow both voice and data to be transmitted over the same system
wiring.
Intended Audience
This book provides detailed information about system and telephone trouble
reports and troubleshooting operations. It is intended for use by qualified
field technicians who are responsible for system maintenance and
troubleshooting, and as a reference by anyone needing such information,
including support personnel, sales representatives, and account executives.
How to Use This Book
This book provides step-by-step procedures for isolating troubles both inside
and outside the communications system. Refer to the chapter associated with
the reported problem to initially start the troubleshooting procedure.
Maintenance and Troubleshooting xvii

Terms and Conventions Used
Refer to the following documentation for additional information:
■ Equipment and Operations Reference provides detailed information
on system hardware, telephones, and other equipment.
■ Feature Reference provides details on the features of the
communications system.
■ System Programming gives procedural instructions for programming
system features.
■Users’ Guides and Operators’ Guides give procedural instructions for
programming and using telephone features.
“Related Documents,”
later in this section, provides a complete list of system
documentation together with ordering information.
In the U.S.A. only, AT&T provides a toll-free customer Helpline (1 800 628-
2888) 24 hours a day. Call the Helpline, or your AT&T representative, if you
need assistance when installing, programming, or using your system.
Terms and Conventions Used
In this document, the terms in the following list are used in preference to
other, equally acceptable terms for describing communications systems.
Lines, Trunks and Facilities
Facility is a general term that designates a communications path between a
telephone system and the telephone company central office. Technically a
trunk connects a switch to a switch, for example the MERLIN LEGEND
Communications System to the central office. Technically, a line is a loop-
start facility or a communications path that does not connect two switches,
for example, an intercom line or a Centrex line. However, in actual usage, the
terms line and trunk are often applied interchangeably. In this book, we use
line/trunk and lines/trunks to refer to facilities in general. Specifically, we refer
to digital facilities. We also use terms such as personal line, ground-start
trunk, DID trunk, and so on. When you talk to your local telephone company
central office, ask them what terms they use for the specific facilities they
connect to your system.
xviii Maintenance and Troubleshooting

Terms and Conventions Used
Some older terms have been replaced with newer terms. The following list
shows the old term on the left and the new term on the right.
trunk module line/trunk module
trunk jack line/trunk jack
station extension
station jack extension jack
analog data station modem data station
digital data station terminal adapter
7500B data station terminal adapter
analog voice and analog data station analog voice and modem data
digital voice and analog data station MLX voice and modem data
analog data only station modem data only station
digital data only station terminal adapter only station
7500B data only station terminal adapter only station
digital voice and digital data station MLX voice and terminal
adapter station
MLX voice and 7500B data station MLX voice and terminal
adapter station
Typographical Conventions
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
steps. You
must attach the wristband
before touching the connection.
Italics indicate emphasis.
The part of the headset that fits over
one or both ears is called a
headpiece.
Italics also set off special terms.
Maintenance and Troubleshooting xix