AT&T MERLIN LEGEND Release 2.0 Analog Multiline... Operating instructions

AT&T
AT&T 555-620-143
Issue 1
October 1992
MERLIN LEGENDTM
Communications System
Release 2.0
Maintenance and Troubleshooting

Copyright © 1992 AT&T AT&T 555-620-143
All Rights Reserved Issue 1
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
1
■ Intended Audience
1
■ Conventions
2
■ Product Safety Labels 3
■ Related Documents
3
■ How to Comment on This Document
5
1
Introduction to System Maintenance
1-1
■ Equipment
1-1
■ Maintenance Strategy
1-15
■ Unit Loads
1-25
2
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
3
Telephone Problems
3-1
■ Telephone Troubleshooting
3-2
■ Fixing Telephone Problems
3-3
■ MLX Telephone Tests
3-9
Contents i

Contents
4 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
5
Central Office Problems 5-1
■ Trunk Errors
5-1
■ Checking Ports 5-7
A
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
B Unit Load Calculation Worksheet B-1
■ Unit Load Worksheet
B-2
ii Contents

Contents
GL Glossary
GL-1
I
Index
l-1
Contents iii

Contents
iv
Contents

Figures
1
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
4
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
A
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

vi Contents

Tables
1
Introduction to System Maintenance
Table 1-1.
Transient/Permanent Error Thresholds
1-22
2
Error Logs, the Access Log, and System
Inventory
Table 2-1.
Error Codes
3 Telephone Problems
Table 3-1.
Troubleshooting Telephone Problems
3-2
Table 3-2. MLX Telephone Display Buttons
3-11
4
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
5
Central Office Problems
Table 5-1.
Troubleshooting Trunk Symptoms 5-2
Contents
vii

viii
Contents

CUSTOMER WARNING
This manual is designed for use by qualified service technicians
only.
Technician qualification includes completion of an AT&T
hands-on instructor-led course covering installation and
maintenance for this product. Installation or maintenance of this
product by anyone other than a qualified service technician may
void the warranty.
Hazardous electrical voltages are present
inside this product.
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.
ix

Use only AT&T-manufactured MERLIN LEGEND™ Communications
System circuit modules, carrier assemblies, and power units in the
MERLIN LEGEND Communications System (51 1A) control unit.
Use only AT&T-recommended/approved MERLIN LEGEND
Communications System accessories.
If equipment connected to the analog station 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
three-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.
x

Customer Support Information
Support Telephone Number
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 authorized dealer, if you need assistance
when installing, programming, or using your system.
Outside the U. S.A., if you need assistance when installing, programming, or using
your system, contact your authorized AT&T dealer.
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 radioelectriques depassant Ies
Iimites applicable aux appareils numériques de la class A prescribes clans Ie
reglement sur Ie brouillage radioelectrique edicté par Ie ministère des Communications
du Canada.
Customer Support Information xi

Customer Support Information
FCC Notification and Repair Information
This equipment is registered with the FCC in accordance with Part 68 of its rules. In
compliance with those rules, you are advised of the following:
Means of Connection. Connection of this equipment to the telephone network
shall be through a standard network interface jack: USOC RJ11C, RJ14C,
RJ21X. Connection to E&M tie trunks requires a USOC RJ2GX. Connection to
off-premises stations requires a USOC RJ11C or RJ14C. Connection to 1.544-
Mbps digital facilities must be through a USOC RJ48C or RJ48X. Connection
to DID requires a USOC RJ11C, RJ14C, or RJ21X. These USOCs must be
ordered from your telephone company.
This equipment may not be used with party lines or coin telephone lines.
Notification to the Telephone Companies. Before connecting this
equipment, you or your equipment supplier must notify your local telephone
company’s business office of the following:
The telephone number(s) you will be using with this equipment.
The appropriate registration number and ringer equivalence number
(REN), which can be found on the back or bottom of the control unit,
as follows:
If this equipment is to be used as Key System, report the number
AS593M-72914-KF-E.
If the system provides both manual and automatic selection of
incoming/outgoing access to the network, report the number
AS593M-72682-MF-E.
If there are no directly terminated trunks, or if the only directly
terminated facilities are personal lines, report the number
AS5USA-65646-PF-E.
The REN for all three systems is 1.5A.
For tie line connection, the facility interface code (FIC) is TL31M and
the service order code (SOC) is 9.0F.
For connection to off-premises stations, the FIC is OL13C and the
SOC is 9.0F.
For equipment to be connected to 1.544-Mbps digital service, the FIC
is 04DU9-B for D4 framing format or 04DU9-C for extended framing
format, and the SOC is 6.0P.
For equipment to be connected to DID facilities, the FIC is 02RV2-T
and the SOC is 9.0F.
The quantities and USOC numbers of the jacks required.
For each jack, the sequence in which lines are to be connected: the
line types, the FIC, and the REN by position when applicable.
You must also notify your local telephone company if and when this equipment
is permanently disconnected from the line(s).
The REN is used to determine the number of devices that may be connected to
the telephone line. Excessive RENs on the line may result in the devices not
xii Customer Support Information

Customer Support Information
ringing in response to an incoming call. In most, but not all, areas the sum of
the RENs should not exceed five (5.0). To be certain of the number of devices
that may be connected to the line, as determined by the total RENs, contact the
telephone company to determine the maximum REN for the calling area.
Installation and Operational Procedures
The manuals for your system contain information about installation and operational
procedures.
Repair Instructions. If you experience trouble because your equipment is
malfunctioning, the FCC requires that the equipment not be used and that it be
disconnected from the network until the problem has been corrected. Repairs
to this equipment can be made only by the manufacturers, their authorized
agents, or others who may be authorized by the FCC. In the event repairs are
needed on this equipment, contact your authorized AT&T dealer or, in the
U.S.A. only, contact the National Service Assistance Center (NSAC) at
1-800-628-2888.
Rights of the Local Telephone Company. If this equipment causes harm to
the telephone network, the local telephone company may discontinue your
service temporarily. If possible, they will notify you in advance. But if advance
notice is not practical, you will be notified as soon as possible. You will also be
informed of your right to file a complaint with the FCC.
Your local telephone company may make changes in its facilities, equipment,
operations, or procedures that affect the proper functioning of this equipment.
If they do, you will be notified in advance to give you an opportunity to maintain
uninterrupted telephone service.
Hearing Aid Compatibility. The custom telephone sets for this system are
compatible with inductively coupled hearing aids as prescribed by the FCC.
Automatic Dialers. WHEN PROGRAMMING EMERGENCY NUMBERS AND/OR
MAKING TEST CALLS TO EMERGENCY NUMBERS:
Remain on the line and briefly explain to the dispatcher the reason for
the call.
Perform such activities in off-peak hours, such as early morning or late
evening.
Direct Inward Dialing (DID).
a.This equipment returns answer supervision signals to the Public
Switched Telephone Network when:
(1)
answered by the called station
(2) answered by the attendant
(3)
routed to a recorded announcement that can be administered
by the customer premises equipment user
(4)
routed to a dial prompt
Customer Support Information
xiii

Customer Support Information
b.This equipment returns answer supervision on all DID calls forwarded
back to the Public Switched Telephone Network. Permissible
exceptions are when:
(1)
a call is unanswered
(2) a busy tone is received
(3)
a reorder tone is received
Allowing this equipment to be operated in such a manner as not to provide
proper answer supervision signaling is in violation of Part 68 rules.
DOC Notification and Repair Information
NOTICE: The Canadian Department of Communications (DOC) label identifies certified
equipment. This certification means that the equipment meets certain
telecommunications network protective, operational, and safety requirements. The
DOC does not guarantee the equipment will operate to the user’s satisfaction.
Before installing this equipment, users should ensure that it is permissible to connect it
to the facilities of the local telecommunications company. The equipment must also be
installed using an acceptable method of connection. In some cases, the company’s
inside wiring for single-line individual service may be extended by means of a certified
connector assembly (telephone extension cord). The customer should be aware that
compliance with the above conditions may not prevent degradation of service in some
situations.
Repairs to certified equipment should be made by an authorized Canadian
maintenance facility designated by the supplier. Any repairs or alterations made by
the user to this equipment, or any equipment malfunctions, may give the
telecommunications company cause to request the user to disconnect the equipment.
Users should ensure for their own protection that the electrical ground connections of
the power utility, telephone lines, and internal metallic water pipe system, if present,
are connected. This precaution may be particularly important in rural areas.
CAUTION: Users should not attempt to make such connections themselves, but should
contact the appropriate electrical inspection authority or electrician, as appropriate.
To prevent overloading, the Load Number (LN) assigned to each terminal device
denotes the percentage of the total load to be connected to a telephone loop used by
the device. The termination on a loop may consist of any combination of devices
subject only to the requirement that the total of the Load Numbers of all the devices
does not exceed 100.
DOC Certification No.: 230 4095A
CSA Certification No.: LR 56260
Load No.: 6
xiv
Customer Support Information

Customer Support Information
Renseignements sur la notification du ministère des Communications du Canada et
la réparation
AVIS: L’étiquette du ministère des Communications du Canada identifie Ie materiel
homologué. Cette étiquette certifie que Ie materiel est conforme à certaines normes de
protection, d’exploitation et de sécurité des réseaux de telecommunications. Le
Ministère n’assure toutefois pas que Ie matériel fonctionnera à la satisfaction de
I’utilisateur.
Avant d’installer ce matériel, I’utilisateur doit s’assurer qu’il est permis de Ie raccorder
aux installations de I’entreprise locale de telecommunication. Le matériel doit
également être installé en suivant une méthode acceptée de raccordement. Dans
certains cas, Ies fils intérieurs de I’enterprise utilises pour un service individual à Iigne
unique peuvent être prolongés au moyen d’un dispositif homologué de raccordement
(cordon prolongateur téléphonique interne).
L’abonné ne doit pas oublier qu’il est possible que la conformity aux conditions
énoncées ci-dessus n’empêchent pas la degradation du service clans certaines
situations. Actuellement, Ies entreprises de telecommunication ne permettent pas que
I’on raccorde Ieur matériel à des jacks d’abonné, sauf clans Ies cas précis prévus pas
Ies tarifs particuliers de ces entreprises.
Les reparations de materiel homologué doivent être effectuées par un centre
d’entretien canadien autorisé désigné par Ie fournisseur. La compagnie de
telecommunications peut demander à I’utilisateur de débrancher un appareil a la suite
de reparations ou de modifications effectuées par I’utilisateur ou à cause de mauvais
fonctionnement.
Pour sa propre protection, I’utilisateur doit s’assurer que tous Ies fils de mise à la terre
de la source d’énergie électrique, des lignes téléphoniques et des canalisations d’eau
métalliques, s’il y en a, sent raccordés ensemble. Cette précaution est
particulièrement importance clans Ies régions rurales.
AVERTISSEMENT: L’utilisateur ne doit pas tenter de faire ces raccordements lui-
même; il doit avoir recours à un service d’inspection des installations éctriques, ou à
un electrician, selon Ie cas.
L’indite de charge (IC) assigné à chaque dispositif terminal indique, pour éviter toute
surcharge, Ie pourcentage de la charge totale qui peut être raccordée à un circuit
téléphonique bouclé utilisé par ce dispositif. La terminaison du circuit bouclé peut être
constitute de n’importe quelle combinaison de dispositifs, pourvu que la somme des
indices de charge de I’ensemble des dispositifs ne dépasse pas 100.
No d’homologation: 230 4095A
Node certification: CSA LR 56260
L’indite de charge: 6
Customer Support Information
XV

Customer Support Information
xvi
Customer Service Information

Customer Support 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. Some individuals use electronic devices to prevent or
falsify records of these calls. Others charge calls to someone else’s number by
illegally using lost or stolen calling cards, billing innocent parties, clipping on to
someone else’s line, and breaking into someone else’s telephone equipment physically
or electronically. In certain instances, unauthorized individuals make connections to
the telephone network through the use of remote access features.
The Remote Access feature of your system, if you choose to use it, permits off-
premises callers to access the system from a remote telephone by using an 800
number or a 7- or 10-digit telephone number. The system returns an
acknowledgement signaling the user to key in his or her authorization code, which is
selected and administered by the system manager. After the authorization code is
accepted, the system returns dial tone to the user. If you do not program specific
egress restrictions, the user will be able to place any call normally dialed from a
telephone associated with the system. Such an off-premises network call is originated
at, and will be billed from the system location.
The Remote Access feature, as designed, helps the customer, through proper
administration, to minimize the ability of unauthorized persons to gain access to the
network. Most commonly, phone numbers and codes are compromised when
overheard in a public location, through theft of a wallet or purse containing access
information, or through carelessness (writing codes on a piece of paper and improperly
discarding it). Additionally, hackers may use a computer to dial an access code and
then publish the information to other hackers. Enormous charges can be run up
quickly. It is the customer’s responsibility to take the appropriate steps to properly
implement the features, evaluate and administer the various restriction levels, protect
access codes, and distribute access codes only to individuals who have been fully
advised of the sensitive nature of the access information.
Common carriers are required by law to collect their tariffed charges. While these
charges are fraudulent charges made by persons with criminal intent, applicable tariffs
state that the customer of record is responsible for payment of all long-distance or
other network charges. AT&T cannot be responsible for such charges and will not
make any allowance or give any credit for charges that result from unauthorized
access.
Customer Support Information
xvii

Customer Support Information
To minimize the risk of unauthorized access to your communications system:
Use a nonpublished Remote Access number.
Assign authorization codes randomly to users on a need-to-have basis,
keeping a log of ALL authorized users and assigning one code to one person.
Use random sequence authorization codes, which are less likely to be easily
broken.
Deactivate all unassigned codes promptly.
Ensure that Remote Access users are aware of their responsibility to keep the
telephone number and any authorization codes secure.
When possible, restrict the off-network capability of off-premises callers, via
use of Call Restrictions and Disallowed List capabilities.
When possible, block out-of-hours calling.
Frequently monitor system call detail reports for quicker detection of any
unauthorized or abnormal calling patterns.
Limit Remote Call Forward to persons on a need-to-have basis.
Limited Warranty and Limitation of Liability
AT&T warrants to you, the customer, that your MERLIN LEGEND Communications
System will be in good working order on the date AT&T or its authorized reseller
delivers or installs the system, whichever is later (“Warranty Date”). If you notify AT&T
or its authorized reseller within one year of the Warranty Date that your system is not in
good working order, AT&T will without charge to you repair or replace, at its option, the
system components that are not in good working order. Repair or replacement parts
may be new or refurbished and will be provided on an exchange basis. If AT&T
determines that your system cannot be repaired or replaced, AT&T will remove the
system and, at your option, refund the purchase price of your system, or apply the
purchase price towards the purchase of another AT&T system.
If you purchased your system directly from AT&T, AT&T will perform warranty repair in
accordance with the terms and conditions of the specific type of AT&T maintenance
coverage you selected. If you purchased your system from an AT&T-authorized
reseller, contact your reseller for the details of the maintenance plan applicable to your
system.
This AT&T limited warranty covers damage to the system caused by power surges,
including power surges due to lightning.
The following will not be deemed to impair the good working order of the system, and
AT&T will not be responsible under the limited warranty for damages resulting from
xviii
Customer Support Information