AT&T MERLIN LEGEND Communications System Release 2.0 Maintenance And Troubleshooting Manual

AT&T 555-620-143 Issue 1 October 1992

AT&T

MERLIN LEGEND

Communications System Release 2.0

Maintenance and Troubleshooting

AT&T 555-620-143

Issue 1

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

■

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 (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/LSMLX) 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.

Customer Support Information

Support Telephone Number

In the U.S.A. only,

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.

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

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

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 1.544Mbps 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

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,

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.

MAKING TEST CALLS TO EMERGENCY NUMBERS:

Direct Inward Dialing (DID).

This equipment returns answer supervision signals to the Public

Switched Telephone Network when: (1) (2) (3)

(4)

contact the National Service Assistance Center (NSAC) at

WHEN PROGRAMMING EMERGENCY NUMBERS AND/OR

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.

answered by the called station answered by the attendant routed to a recorded announcement that can be administered by the customer premises equipment user routed to a dial prompt

Customer Support Information

xiii

Customer Support Information

This equipment returns answer supervision on all DID calls forwarded

back to the Public Switched Telephone Network. Permissible exceptions are when: (1) (2)

(3)

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.

a call is unanswered a busy tone is received a reorder tone is received

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

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 luimême; 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

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 offpremises 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

failure to follow AT&T’s installation, operation, or maintenance instructions unauthorized system modification, movement, or alteration unauthorized use of common carrier communication services accessed through the system abuse, misuse, or negligent acts or omissions of the customer and persons under the customer’s control acts of third parties and acts of God

AT&T’S OBLIGATION TO REPAIR, REPLACE, OR REFUND AS SET FORTH ABOVE IS YOUR EXCLUSIVE REMEDY.

EXCEPT AS SPECIFICALLY SET FORTH ABOVE, AT&T, ITS AFFILIATES, SUPPLIERS, AND AUTHORIZED RESELLERS MAKE NO WARRANTIES, EXPRESS OR IMPLIED, AND SPECIFICALLY DISCLAIM ANY WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Limitation of Liability

EXCEPT FOR PERSONAL INJURY, DIRECT DAMAGES TO TANGIBLE PERSONAL PROPERTY PROXIMATELY CAUSED BY AT&T, AND LIABILITY OTHERWISE EXPRESSLY ASSUMED IN A WRITTEN AGREEMENT SIGNED BY AT&T, THE LIABILlTY OF AT&T, ITS AFFILIATES, SUPPLIERS, AND AUTHORIZED RESELLERS FOR ANY CLAlMS, LOSSES, DAMAGES, OR EXPENSES FROM ANY CAUSE

WHATSOEVER (INCLUDING ACTS OR OMISSIONS OF THIRD PARTIES), REGARDLESS OF THE FORM OF ACTION, WHETHER IN CONTRACT, TORT OR OTHERWISE, SHALL NOT EXCEED AN AMOUNT EQUAL TO THE LESSER OF THE DIRECT DAMAGES PROVEN OR THE PURCHASE PRICE OF THE SYSTEM. IN NO EVENT SHALL AT&T OR ITS AFFILIATES, SUPPLIERS, OR AUTHORIZED RESELLERS BE LIABLE FOR INCIDENTAL, RELIANCE, CONSEQUENTLY, OR ANY OTHER

INDIRECT LOSS OR DAMAGE (INCLUDING LOST PROFITS OR REVENUES)

INCURRED IN CONNECTION WITH THE SYSTEM. THIS LIMITATION OF LIABILITY SHALL SURVIVE FAILURE OF THE EXCLUSIVE REMEDY SET FORTH IN THE LIMITED

WARRANTY ABOVE.

Voice Mail Systems

Your Voice Mail system permits callers to leave verbal messages for system users or gain access to the back-up position in an emergency as well as create and distribute

voice messages among system users. The Voice Mail system, through proper administration, can help you reduce the risk of

unauthorized persons gaining access to the network. However, phone numbers and authorization codes can be compromised when overheard in a public location, are lost through theft of a wallet or purse containing access information, or through carelessness (writing codes on a piece of paper and improperly discarding them).

Customer Support Information

xix

Customer Support Information

Additionally, hackers may use a computer to dial an access code and then publish the

information to other hackers. Substantial charges can accumulate quickly. It is your

responsibility to take appropriate steps to implement the features properly, evaluate and administer the various restriction levels, protect and carefully distribute access codes.

Under applicable tariffs, you will be responsible for payment of toll charges. AT&T cannot be responsible for such charges and will not make any allowance or give any credit resulting from unauthorized access.

To reduce the risk of unauthorized access through your Voice Mail system, please observe the following procedures:

Employees who have voice mailboxes should be required to use the passwords to protect their mailboxes.

Have them use random sequence passwords. Impress upon them the importance of keeping their passwords a secret. Encourage them to change their passwords regularly.

The administrator should remove any unneeded voice mailboxes from the

system immediately.

AUDIX Voice Power™ has the ability to limit transfers to subscribers only. You

are strongly urged to limit transfers in this manner.

Use the PBX or Key system administration capability to do the following:

Block direct access to outgoing lines and force the use of account codes/authorization codes. Disallow trunk-to-trunk transfer unless required. Assign toll restriction levels to all AUDIX Voice Power ports. If you do not need to use the Outcalling feature, completely restrict the

outward calling capability of the AUDIX Voice Power ports. Monitor SMDR reports or Call Accounting System reports for outgoing calls that might be originated by AUDIX Voice Power ports.

Remote Administration and Maintenance

The Remote Administration and Maintenance feature of your telecommunications

system, if you choose to use it, permits users to change the system features and capabilities from a remote location.

The Remote Administration and Maintenance feature, through proper administration,

can help you reduce the risk of unauthorized persons gaining access to the network. However, telephone numbers and authorization codes can be compromised when overheard in a public location, are lost through theft of a wallet or purse containing access information, or through carelessness (writing codes on a piece of paper and

Customer Support Information

improperly discarding them). Additionally, hackers may use a computer to dial an access code and then publish the information to other hackers. Substantial charges can accumulate quickly. It is your responsibility to take appropriate steps to implement the features properly, evaluate and administer the various restriction levels, and protect and carefully distribute access codes.

To reduce the risk of unauthorized access through Remote Administration and Maintenance, please observe the following procedures:

The System Administration and Maintenance capability of a PBX or Key system is protected by a password.

Change the default password immediately.

Continue to change the password regularly. Only give the password to people who need it and impress upon them the need to keep it secret. If anyone who knows the password leaves the company, change the password immediately.

If you have a special telephone line connected to your PBX or Key system for

Remote Administration and Maintenance, you should do one of the following:

Unplug the line when it is not being

Install a switch

Keep the Remote Administration and Maintenance telephone number secret. Only give it to people who need to know it, and impress upon them the need to keep it a secret. Do not write the telephone number on the PBX or Key system, the connecting equipment, or anywhere else in the system room.

If your Remote Administration and Maintenance feature requires that someone in your office transfer the caller to the Remote Administration and Maintenance extension, you should impress upon your employees the importance of only transferring authorized individuals to that extension.

in the line to turn it off when it is not being used.

used.

Customer Support Information

xxi

About This Book

The Maintenance and Troubleshooting guide provides information and guidelines to assist you in resolving problems with the MERLIN LEGEND™

Release 2.0 Communications System.

Intended Audience

This book is intended for the qualified field technicians who respond to

customer trouble reports.

Intended Audience

About This Book

Conventions

The following typographical conventions are used in this book:

Bold type is

Press

Italic type is used for emphasis and as a substitute for information for which you must supply a specific value.

Dial feature code; dial

Constant width

screens or on a PC screen,

Select

Bold constant width

exactly as shown.

Type

Keys on the PC are shown in boxes.

Press [ F7 ].

When two keys are to be pressed at the same time, the keys are connected by a hyphen.

used for telephone buttons.

Drop

Sys Program.

install ; dial

to delete the current entry.

✱

ext. no.

type is used for information on telephone display

type indicates information that you enter

#55.

2 Conventions

Press [ Alt ] - [ P ] .

About This Book

Product Safety Labels

Throughout these documents, hazardous situations are indicated by an

exclamation point inside a triangle and the word “caution” or “warning.”

WARNING:

Warning indicates the presence of a hazard that could cause death or severe personal injury if the hazard is not avoided.

CAUTION:

Caution indicates the presence of a hazard that could cause minor

personal injury or property damage if the hazard is not avoided.

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 not included in this section, write directly to the

following address: A. Sherwood

AT&T 99 Jefferson Road Room 2A25 Parsippany, NJ 07054

How to Comment on This Document

Introduction to System Maintenance

The purpose of maintenance is to detect, report, and clear problems quickly

with minimum disruption of service. The system attempts to isolate each problem to a single replaceable unit whenever possible by running automatic

tests. Errors that cannot be automatically corrected are usually recorded in

error logs. Most of your troubleshooting will rely on checking these error logs

and interpreting them using Table 2-1, “Error Codes,” in Chapter 2.

Equipment

To perform maintenance, you need a maintenance terminal and some additional tools, all of which are defined below.

Maintenance Terminal

Whether you perform maintenance on-site or remotely, you will need a maintenance terminal:

■

For on-site maintenance, use one of the following:

— MLX-20L console — PC with System Programming and Maintenance (SPM)

Equipment 1-1

Introduction to System Maintenance

NOTE:

The PC can be a DOS PC or a Master Controller (MCII+ or MCIII)

A 355 AF adapter and D8W-87 cord is required to connect the PC to the control unit

■

For remote maintenance, use a DOS PC with SPM.

NOTE:

On-site maintenance is preferred; remote maintenance overrides on-site maintenance and programming, except when on-site backup or restore is in progress.

See “On-Site Maintenance” or “Remote Maintenance” later in this section for details.

Tools

In addition to setting up the maintenance terminal, you should have the

following tools:

EIA breakout box

digital voltmeter (KS-20599 or equivalent)

110O/66-type punch down tool

Dracon TS21 or equivalent touch-tone test telephone assorted flathead screwdrivers assorted Phillips®-head screwdrivers

long-nosed pliers

1-2 Equipment

+ 189 hidden pages

AT&T MERLIN LEGEND Communications System Release 2.0 Maintenance And Troubleshooting Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

IMPORTANT SAFETY INSTRUCTIONS

Customer Support Information

About This Book

Intended Audience

Conventions

Product Safety Labels

Related Documents

How to Comment on This Document

Introduction to System Maintenance

Equipment

Maintenance Terminal

Tools