AT&T MERLIN LEGEND Communications System PBX... Technical manual

AT&T
MERLIN LEGEND™
Communications System
PBX System Planning

Copyright © 1991 AT&T AT&T 555-610-113
All Rights Reserved
Issue 1
Printed in U.S.A. August 1991
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) Information
For important FCC interference, registration, and repair information, see ‘Customer Support Information” in this book.
Trademarks
Accunet is a registered trademark of AT&T.
AUDIX is a registered trademark of AT&T.
Magic on Hold is a registered trademark of AT&T.
Megacom is a registered trademark of AT&T.
MERLIN is a registered trademark of AT&T.
MERLIN LEGEND is a trademark of AT&T.
MERLIN MAIL is a trademark of AT&T.
MLX-10, MLX-10D, MLX-20L, and MLX28D are trademarks of AT&T.
MultiQuest is a registered trademark of AT&T.
PagePac is a registered trademark of DRACON, a Division of Harris Corporation.
UNIX is a registered trademark of UNIX System Laboratories, inc.
ZoneMate is a trademark of DRACON, a Division of Harris Corporation.
Support Telephone Number
AT&T provides atoll-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 your system.

ERRATA
MERLIN LEGEND™ Communications System
PBX System Planning
555-610-113
Ignore all references to the small processor module. The MERLIN LEGEND™ Communions
System offers only one processor module. This processor module is referred to as a large processor
module in this document.
Page 1-6
Table 1-2, Control Unit Space Requirements: Ignore the reference to a small system. The backboard
dimensions shown for a “small” system are the dimensions needed for a system with a basic carrier or a
system with basic carrierr and one expansion carrier.
Page 2-1
Under the "Processor Module" bullet: Ignore the reference to the “small” processor module.
Page 2-5
Under “Planning Form
of Processor Module”:
Appendix A - Forms
Instructions” for PBX System Form 1, System Planning, under the section “Size
AIways check the box labeled “large.”
PBX System Form 1, System Planning, und`er the section “Size of Processor Module”: Always check the
box labeled “large.”
October 1, 1991

Contents
Customer Support Information vii
■ Support Telephone Number
vii
■ FCC/DOC Information
vii
■ Security xi
■ Warranty xi
About This Book xiii
■ Related Documentation
xiv
■ How to Order Books
xiv
■ Additional Ordering Information
xv
■ Product Safety Labels
xv
■ How to Comment on This Book
xv
1Preparation
■ System Components
■ Location of the Control Unit
■ Telephone User Survey
■ Floor Plan
1-1
1-1
1-5
1-7
1-11
2 Control Unit 2-1
■ Modules 2-1
■ System Operating Conditions
2-9
■ System Numbering
2-12
3
Trunks 3-1
■ Trunk Connections
3-1
■ Trunk Options
3-7
■ Trunk Assignment
3-43
Contents i

Contents
4
Features 4-1
Telephone Features
4-1
Operator Features
4-6
Group Assigned Features 4-14
System Features 4-27
5
Modifications 5-1
■ Preparation 5-1
■ Adding to the System
5-2
AForms A-1
INIndex IN-1
ii Contents

Figures
1
Preparation
1-1 System Components
1-2
1-2
Employee Communication Survey Form
1-8
1-3 Floor Plan
1-12
2 Control Unit
2-1 Trunk and Station Modules
2-2
2-2 Sample Control Unit Diagram
2-8
2-3 Two-Digit Numbering Plan
2-21
2-4
Three-Digit Numbering Plan 2-23
2-5 Set Up Space Numbering Plan 2-25
3
Trunks
3-1
Partially Completed Form 2c, System Numbering — Trunk Jacks
3-5
3-2 Sample Network Planning Map
3-32
3-3
Factory-Set Assignment, Digital/lSDN (MLX) Telephones
3-45
3-4
Factory-Set Assignment, Analog Multiline Telephones
3-46
3-5 Digital/lSDN (MLX) DLC 3-49
3-6
Analog Multiline DLC
3-49
4 Features
4-1 Completed ARS Worksheet
4-42
4-2 Example One, PBX System Form 9b
4-47
4-3 Example Two, PBX System Form 9b
4-48
4-4 Subpattern Example
4-51
4-5 Extra Digit Example
4-53
4-6
Digit Absorption Example
4-55
Contents iii

Tables
1
Preparation
1-1 Environmental Requirements
1-5
1-2
Control Unit Space Requirements
1-6
1-3
Employee Communication Survey — Sample Analysis
1-10
2
Control Unit
2-1 Module Capacities
2-4
2-2 Station Jack Types
2-13
2-3 Maximum Number of Operator Positions 2-15
3 Trunks
3-1 Trunk Jack Types
3-2
3-2 Coding Trunk Type
3-3
3-3 Services on the DS1 Facility
3-17
3-4
Line Compensation Settings
3-21
3-5
Timers and Counters
3-28
3-6
Guide to DS1 Facilities Ordering
3-35
5
Modifications
5-1 Required Trunk and/or Station Modules
5-3
5-2
Adding New Trunks
5-5
5-3
Adding Auxiliary Equipment
5-5
5-4
Adding New Stations
5-6
AForms
A-1 PBX System Forms
A-1
iv Contents

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, basic safety precautions should always be followed to reduce the
risk of fire, electric 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 telephone jacks 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™ circuit modules, carrier assemblies, and power units
in the MERLIN LEGEND (511A) control unit.
Use only AT&T-recommended/approved MERLIN LEGEND accessories.
If equipment connected to the analog station modules (008/408/408 GS/LS) or to the MLX telephone
module (008 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 electric shock.
The MERLIN LEGEND is equipped with a three-wire grounding-type plug, a plug having 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 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 electric
shock. Never spill liquid of any kind on this product.
Unplug this product from the wall outlet before cleaning. Do not use liquid or aerosol cleaners on this
product. Use a damp cloth for cleaning.
v

Customer Support Information
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 your system.
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 Pr6sent Appareil Numerique, n’emet pas de bruits radioelectriques depassant Ies Iimites applicable aux apparails
numeriques de la class A prescribes clans Ie reglement sur Ie brouillage radioelectrique edicte par Ie ministere des
Communications du Canada.
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 Mbs digital facilities must be through a USOC RJ48C or
RJ48X. Connection to DID requires a RJ11 C, 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, is as follows:
If this equipment is to be used as Key System, report the following number AS593M-72914-KF-E, and if the system
provides both manual and automatic selection of incoming/outgoing access to the network, report AS593M-72682-
MF-E. The ringer equivalence number for both systems is 1.5A.
■
For tie line connection, provide the telephone company the facility interface code (FIC) of TL31M and the service order
code (SOC) 9. OF.
Customer Support Information vii

Customer Support Information
■
For connection to off-premises stations, report the FIC OL 13C and SOC 9. OF.
■
If this equipment is to be connected to digital service (1 .544 Mbs), the FIC is 04DU9-B for D4 framing format or 04DU9-C
for extended framing format, and SOC 6.OP.
■
If this equipment is to be connected to DID facilities, the FIC is 02RV2-T, and the SOC is 9. OF.
■
The quantities and USOC numbers of the jacks required.
■
For each jack, provide the sequence in which lines are to be connected: the type lines, the FIC, and 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 quantity of devices which maybe connected to the telephone line. Excessive REN’s on the
telephone line may result in the devices not ringing in response to an incoming call. In most, but not all, areas the sum of the
REN’s should not exceed five (5.0). To be certain of the number of devices that maybe connected to the line, as determined
by the total REN’s, 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 by others who maybe authorized by the FCC.
In the event repairs are needed on this equipment, please contact the National Service Assistance Center (NSAC) at 1-600-
626-2666, or your authorized AT&T dealer.
■
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 the off-peak hours, such as early morning or late evening.
DOC Notification and Repair Information
NOTICE: The Canadian Department of Communications (DOC) label identifies certified equipment. This certification means that
the equipment meets 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 electric
inspection authority or electrician, as appropriate.
viii Customer Support Information

Customer Support Information
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
Renseignements sur la notification du ministere des Communications du Canada et la reparation
AVIS: L’etiquette du ministere des Communications du Canada identifie Ie materiel homologue. Cette etiquette certifie que Ie
materiel est conforme a certiaines normes de protection, d’exploitation et de securite des reseaux de telecommunications. Le
ministere n’assure toutefois pas que le materiel fonctionnera a la satisfaction de I’utilisateur.
Avant d’installer ce materiel, I’utilisateur doit s’assurer qu’il est permis de Ie raccorder aux installations de I’entreprise locale de
telecommunication. Le materiel doit egalement etre installe en suivant une methode acceptee de raccordement. Dans certains
cas, Ies fils interieurs de I’enterprise utilises pour un service individual a Iigne unique peuvent etre prolonges au moyen d’un
dispositif homologue de raccordement (cordon prolongateur telephonique interne). L’abonne ne doit pas oublier qu’il est
possible que la conformite aux conditions enone6es ci-dessus n’empechent pas la degradation du service clans certaines
situations. Actuellement, Ies entreprises de telecommunication ne permettent pas que l’on raccorde leur materiel a des jacks
d’abonne, sauf dans Ies cas precis prevus par Ies tarifs particuliers de ces entreprises.
Les reparations de materiel homologue doivent etre effectuees par un centre d’entretien canadien autorise designe par Ie
fournisseur. La compagnie de telecommunications peut demander a I’utilisateur de debrancher un appareil a la suite de
reparations ou de modifications effectutees par I’utilisateur ou a cause de mauvais fonctionnement.
Pour sa propre protection, l’utilisateur doit s’assurer que tous Ies fils de mise a la terre de la source d’energie electrique, des
Iignes telephoniques et des canalisations d’eau metalliques, s’il y en a, sent raccordes ensemble. Cette precaution est
particulierement importance clans les regions rurales.
AVERTISSEMENT L’utilisateur ne doit pas tenter de faire ces raccordements lui-meme; il doit avoir recours a un service
d’inspection des installations electriques, ou a un electrician, selon Ie cas.
L’indite de charge (IC) assigne a chaque dispositif terminal indique, pour eviter toute surchage, Ie pourcentage de la charge
totale qui peut etre raccordee a un circuit telephonique boucle utilise par ce dispositif. La terminaison du circuit boucle peut etre
constitute de n’importe quelle combinaison de dispositifs, pourvu que la somme des indices de charge de I’ensemble des
dispositifs ne depasse pas 100.
No d’homologation 230 4095A
Node certification CSA: LR 56260
L’indite de charge: 6
Customer Support Information ix

Customer Support Information
x Customer Support 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 utilize 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.
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
Limited Warranty
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.
Customer Support Information xi

Customer Support Information
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. A written explanation of AT&T’s types of maintenance
coverage may be obtained from AT&T by calling 1-800-247-7000. 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 this
limited warranty for damages resulting from
■ 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 MERCHANTABlLlTY 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 LIABILlTY OTHERWISE EXPRESSLY ASSUMED IN A WRllTEN AGREEMENT SIGNED BY AT&T, THE LIABILITY 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.
xii Customer Support Information

About This Book
This book tells you how to plan a Hybrid/PBX communications system. It is
intended for persons who plan, implement, coordinate, and manage the system
(called system managers).
In addition to this book, you will need
■copies of the PBX System Planning Forms
You will use these forms to
■outline the decisions you make about how the system should be
assembled and programmed—for example, what trunks will be
connected to the control unit and in what order.
■program the system following the form information. These forms are
formatted to reflect the order, or sequence, of programming and include
the category and entry titles found on the programming screens.
create an external record of your system’s configuration-its equipment,
options, and features.
the AT&T list of equipment ordered for the system
■
■the local telephone company’s and long-distance vendor’s trunk information
lists
■copies of the Employee Communication Survey form
■a floor plan showing the locations of the equipment
About This Book xiii

About This Book
Related Documentation
The following kinds of documentation are available to help you set up, use, and
maintain the communications system:
reference
setup and modification
telephone user support
operator guides
miscellaneous
How to Order Books
The books needed for operating the communications system were supplied with
the system. You can order addtional copies of these and other books listed
below from the AT&T Customer Information Center:
■ Within the continental United States, call 1-800-432-6600.
■ In Canada, call 1-800-255-1242.
MERLIN LEGEND Book Title
Order Number
System Setup and Modification
PBX System Planning 555-610-113
PBX System Planning Forms only 555-610-117
Key System Planning
555-610-112
Key System Planning Forms only 555-610-116
Data Guide
555-610-114
Data Planning Forms only
555-610-118
System Programming
555-610-111
System Reference
System Reference
555-610-110
Telephone User Support
Analog Multiline Telephones User’s Guide
555-610-120
MLX-10D,™ MLX-28D,™ and MLX-20L™ Digits//KDN Display
Telephones User’s Guide
555-610-122
MLX-10™ Digital/ISDN Non-Display Telephone
User’s Guide 555-610-123
MLX-10™ and MLX-10D™ User Cards 555-610-124
MLX-28D™ and MLX-20L™ User Cards 555-610-125
Single-Line Telephones User’s Guide 555-610-121
xiv Related Documentation

About This Book
MERLIN LEGEND Book Title
Order Number
I
Operator Guides
Analog Direct-Line Consoles Operator’s Guide
555-610-131
Digital/ISDN Direct-Line Consoles Operator’s Guide 555-610-132
Digits//lSDN Queued Call Console Operator’s Guide 555-610-133
Miscellaneous
Calling Group Supervisor’s Guide 555-610-130
Additional Ordering Information
For information on ordering replacement parts, accessories, and other
equipment that is compatible with the system, see Appendix A in System
Reference.
Product Safety Labels
Throughout this book, hazardous situations are indicated by an exclamation
point inside a triangle, along with 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 will or can cause minor
personal injury or property damage if the hazard is not avoided.
How to Comment on This Book
We welcome your feedback on this book. Please use the feedback form that
follows. If the form is missing, send your comments to A. Sherwood, AT&T,
99 Jefferson Road, Rm. #2A25, Parsippany, NJ 07054.
Related Documentation XV

Preparation
Several actions need to be completed before the system is installed:
■ Review the system’s hardware, features, and operation.
■ Arrange for the location of the control unit.
■ Survey telephone users on their needs.
■ Find or create a floor plan.
System Components
To tailor the system for your company, you must know the number and types of
telephones, outside trunks, and adjuncts that were ordered. Review the AT&T
Equipment List provided by your AT&T representative or authorized dealer.
If you did not participate in ordering, talk with your management about how the
equipment ordered will be used—for example, which employees will get what
telephones, which consoles operators will be using, and where adjuncts will be
located.
Figure 1-1 shows the components of a typical system. Your system may not
have all the components pictured, or it may have additional or different
components. The numbered items in the figure correspond to the descriptions
that follow.
Note: The outside lines in systems operating in the Hybrid/PBX mode are called
trunks.
System Components 1-1

Preparation
Figure 1-1 System Components
1-2 System Components

Preparation
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Control Unit. The backbone of the system, consisting of the basic and
expansion carriers, power supply module, processor module, and trunk and
station modules. The control unit connects telephone company trunks with
stations such as telephones and adjuncts.
Trunk and Station Modules. The components that connect telephone
company trunks and terminal equipment such as telephones, external alerts,
and fax machines via jacks to the control unit.
Basic Carrier. The component attached to the backboard used to hold the
modules needed for system operation. The basic carrier houses the
processor module, power supply module, and up to five trunk and station
modules. Each expansion carrier houses its own power supply module and
up to six additional trunk and/or station modules. One or two expansion
carriers can be added.
Processor Module. A miniature computer that controls most of the system’s
features and supplies the system’s diagnostics. The processor module
provides two jacks, one for Station Message Detail Recording (SMDR) and
the other for system programming and maintenance via a personal computer
(PC).
Power Supply Module. The component that supplies DC power for the
modules and telephones (one power supply unit is needed per carrier). If the
system’s power requirements exceed the capacity of the power supply
module, an auxiliary power supply unit can be added.
Direct Station Selector (DSS). A console that adds 50 buttons for one-touch
extension dialing to the MIX-20L™ or MLX-28D™ telephone and speeds call
handling.
Analog Data Terminal. A data terminal such as a PC, printer, or optical
reader that connects via a modem (for transmitting and receiving analog
signals) to a 012 basic telephone module or a 008 OPT module. A data
terminal can also be connected to an MLX telephone using a Multi-Function
Module (MFM) or to an analog multiline telephone using a General Purpose
Adapter (GPA.)
Magic on Hold
®
. Optional equipment that connects to the system through a
GS/LS jack programmed for Music-on-Hold. (A customer-provided music
source can be connected instead of Magic on Hold.)
General Purpose Adapter (GPA). An adapter used to connect a variety of
tip/ring (T/R) adjuncts to an analog multiline telephone (shown here with an
answering machine).
Analog Multiline Telephone. A 34-button telephone with built-in
speakerphone that connects to the system via an analog station jack. Other
analog multiline telephones compatible with the system include the 22- and
34-button with built-in speakerphone and a one-line, 16-character display
and the 10- and 22-button with built-in speakerphone, without display.
MLC-5 Cordless Telephone. A cordless multiline telephone that connects to
the control unit via an analog station jack.
Industry-Standard Single-Line Telephone. A touch-tone or rotary industry-
standard telephone connected to the system via a 012 basic telephone
module or a 008 OPT module.
System Components 1-3