AT&T MERLIN 820 Installations- und Benutzerhandbuch

AT&T

MERLIN

™

COMMUNICATIONS SYSTEM

SERVICE AND

MAINTENANCE MANUAL

MODEL 820

SERVICE AND MAINTENANCE

MANUAL - MODEL 820

MERLIN™

COMMUNICATIONS SYSTEM

Printed in U.S.A.

Issue 1, June 1984

CUSTOMER PROVIDED

Cord (D8W)

CUSTOMER PROVIDED

Auto

Dialer

Terminal

Adjunct Cord

(DSAC)

D4CH

Modular

Terminal

Modular Terminal Jack

(103A)

5-BUTTON

VOICE TERMINAL

DW8SE

Cord

Modular

Terminal

Cord (D8W)

Extra Alert

Modular Line Cord (D4CH)

Control

Switch

(Optional)

Manual Telephone

Accessory and

Modem Interface

10-BUTTON

VOICE TERMINAL

Hands-Free Unit

Terminal

Adjunct Cord

(D8AC)

34-BUTTON

Headset Adapter

VOICE TERMINAL

820A CONTROL UNIT

Music Source

Paging Amplifier

JUMPER

CORDS

JACK FIELD

Modular

Terminal

Cord (D8W)

Terminal

Extension Cord

(D8AF)

Headset ANSWERING

MACHINE

D4CH

Eight-

line

Adapter

MERLIN

™

COMMUNICATIONS SYSTEM

Modular

Line

Cord

Modular

(D4CH)

Line Cord

(D4CH)

POWER FAIL

TRANSFER

TELEPHONE

SET

EXTRA ALERT

(CARTRIDGE-POWERED)

Modular

CUSTOMER PROVIDED

Line Cords

(D2R)

Line

Bridging

Adapter

(267A2)

Two-Line

Adapter (267C)

LINE-POWERED

EXTRA ALERT

RJ21C: 8 lines RJ11C: 1 line RJ14C: 2 lines

per connector per jack per jack

NETWORK INTERFACES

CONTENTS

HOW TO USE THIS MANUAL

FIRST: Perform the Tests in the “BASIC TROUBLE TESTS”

Section

SECOND: Determine Whether the Trouble Is Constant or

Intermittent

THIRD: Describe the Trouble

FOURTH: Select the Correct Trouble Isolation

Procedure

FIFTH: Perform the Trouble Isolation Procedure

Selected

SIXTH: Replace Faulty Components

AN OVERVIEW OF YOUR SYSTEM

BASIC TROUBLE TESTS

TESTS TO DETERMINE IF THE TROUBLE IS IN YOUR

SYSTEM

SYMPTOM-BASED TESTS

List of Symptom-Based Tests

Voice Terminal Does Not Ring

Cannot Make an Outside Call

Trouble with Indicator Lights, Speaker, or Ringing

Some Custom Features Do Not Work

All Voice Terminals Have No Lights and No Dial Tone (Entire Sys-

tem Down)

Voice Terminal Rings Constantly

GENERAL TESTS

IF TROUBLE REMAINS

HOW TO SELECT THE CORRECT PROCEDURE

TEST SEQUENCE

TROUBLE ON ONE VOICE TERMINAL

TEST A:

TEST B:

TEST C:

TEST D:

VOICE TERMINAL TEST

CONTROL UNIT TEST

VOICE TERMINAL CORDS AND CABLE TEST

2-LINE/5-TERMINAL EXPANSION MODULE

TEST

TROUBLE ON MORE THAN ONE VOICE TERMINAL

TEST A:

CONTROL UNIT TEST

- i -

TEST B: MODULAR LINE CORDS AND NETWORK INTERFACE

TEST

TEST C: 2-LINE/5-TERMINAL EXPANSION MODULE

TEST

Voice Terminals Jack Test

Tel. Co. Lines Test

TROUBLE ON AN ACCESSORY

TEST A:

FOR AUXILIARY POWER DEVICES.

Auxiliary Power Unit

Voice Terminal Power Supply

TEST B: FOR ACCESSORIES ATTACHED TO A VOICE

TERMINAL

TEST C: FOR ACCESSORIES NOT ATTACHED TO A VOICE

TERMINAL

Power Failure Transfer Telephone (PFTT)

Music-on-Hold Equipment

Paging System

Extra-Alert Devices

Line-Powered Alerts

MAINTENANCE EXCHANGE PROCEDURES

- ii -

How to Use This Manual

HOW TO USE THIS MANUAL

If you place an outside call using your voice terminal and cannot be heard, cannot

hear, or you hear static on the line; hang up and try to place the call again before

trying to locate the trouble.

The trouble locating procedures in this manual have been designed so that you can

easily locate a

component

causing trouble in your small business communications

system (Model 820). Also, the trouble locating procedures help you identify and

correct any problem in your system that is caused by incorrect use of certain system

features. When using this manual, you should first read this section completely;

then perform the tests described in the “BASIC TROUBLE TESTS” section.

If you have questions concerning any information contained in this manual, please

call your equipment supplier for help.

For your convenience, the instructions for identifying a cause of trouble are divided

into the following sections:

●

Basic Trouble Tests

●

How to Select the Correct Procedure

●

Trouble on One Voice Terminal

●

Trouble on More than One Voice Terminal

●

Trouble on an Accessory

●

Maintenance Exchange Procedures.

Before trying to isolate a trouble, you should read this section completely.

At all times, you must:

●

Follow the instructions carefully.

●

Conduct tests in the specified order.

To use this manual, you do not need special skills in troubleshooting or electronics.

But you will need to do the following.

FIRST:

Perform the Tests in the “BASIC TROUBLE TESTS” Sec-

tion

When trouble is detected, you should first perform the tests described in the

“BASIC TROUBLE TESTS” section of this manual. These tests give you the simple

tests that may be performed on your communications system. If the cause of the

Page 1

How to Use This Manual

trouble is not found when you have completed these tests, go to “HOW TO SELECT

THE CORRECT PROCEDURE” section in this manual to continue your attempt to

find the cause of the trouble.

SECOND:

Determine Whether the Trouble Is Constant or Inter-

mittent

If the cause of the trouble was not found by performing the basic trouble tests, you

should find out whether it is always present or whether it is intermittent. For

example, if there is noise on an outside call, place the outside call again to see if the

noise is still present.

If the trouble comes and goes, you have an intermittent problem. Locating the

cause of intermittent trouble is hard because it may not last long enough for you to

complete the trouble isolation procedures. If the trouble keeps coming and going,

call your equipment supplier for help.

THIRD:

Describe the Trouble

If the problem is not intermittent but persists, describe it on paper. Include the fol-

lowing information:

The intercom number(s) of the voice terminal(s) on which the trouble appears

●

(the intercom numbers range from 10 to 29).

The telephone number(s) of the line button(s) on which the trouble appears, or

●

the label of the feature button which seems to be causing the trouble. For exam-

ple, if the trouble appears while you are trying to make an intercom or outside

call, write “intercom” or the number of the outside line button from which you

are calling.

●

The kind of trouble. For example, write down “noise on the line,” “light does not

come on by the INTERCOM button,” “cannot interrupt dial tone,” or “HOLD

button does not work.”

FOURTH:

Select the Correct Trouble Isolation Procedure

After describing the trouble on paper, follow the steps in the section labeled “HOW

TO SELECT THE CORRECT PROCEDURE.” This explains which procedure to fol-

low for finding faulty components such as voice terminals, cartridges, modular

cords, or adapters.

FIFTH:

Perform the Trouble Isolation Procedure Selected

When you have determined which trouble isolation procedure to use (either Trouble

on One Voice Terminal, Trouble on More than One Voice Terminal, or Trouble on an

Accessory), perform that procedure to locate the faulty component. If you are

unable to locate the faulty component, call your equipment supplier for help.

Page 2

How to Use This Manual

SIXTH:

Replace Faulty Components

When you locate the faulty component, you can replace it with one that works prop-

erly. If you have a maintenance contract, it will specify whether you should:

Order a replacement component.

Return the component to an Exchange Center for replacement.

components.

If you do not have an on-site maintenance contract, the Maintenance Exchange Pro-

cedures section at the end of this manual will explain how to obtain replacement

AN OVERVIEW OF YOUR SYSTEM

Your system may include all of the following components. Each component is

replaceable.

●

Voice terminals, including the handset, the handset cord, and the voice termi-

nal body.

Wiring

between the voice terminal and the control unit, and between the control

unit and the network interface. The wiring includes all modular cords, cables,

adapters, modular to modular connectors, and 103A Modular Jacks.

Accessories, including power failure transfer telephones, headset adapters,

hands-free units, equipment for music-on-hold, paging, extra alerts, voice termi-

nal power supply, and auxiliary power unit.

Control unit,

including feature cartridge(s) and expansion modules (see Fig-

ure 1).

Network interface, the point at which local telephone company equipment is

connected to your small business communications system. Clearing trouble at

the network interface or outside your system is the responsibility of the local

telephone company.

These components are usually connected in one of the five wiring plans in Figure 2.

Page 3

How to Use This Manual

2–LINE/5–TERMINAL

EXPANSION MODULE (SEE NOTE)

Model 820

Warning

Power

Admin.

Toll Prefix

Tone

Normal

Area Code

Pulse

T R1 2M1 M2

ON OFF

PAGING

SIGNAL

BACKGROUND

MUSIC MUSIC

HOLD

Off

Voice

Terminals

Tel. Co.

Lines

Cartridge Type I

FEATURE PACKAGE 2

Cartridge Type II

Cartridge Type III

POWER FAIL LINES EXTRA ALERT

NOTE:

Each 2-Line/5-Terminal expansion module gives you the capability to connect and use two outside lines and

five voice terminals. One expansion module is shipped with each control unit; therefore, to have more than

two outside lines and five voice terminals connected to your system, you must order additional expansion

modules. The control unit can handle up to four expansion modules.

Figure 1—Knowing Your Control Unit

Page 4

How to Use This Manual

WIRING PLAN A – USING MODULAR TERMINAL CORDS, VOICE

TERMINAL CABLING, MODULAR JACKS, AND

2.5–FOOT JUMPER CORDS

JUMPER

MODEL 820 CONTROL UNIT

VOICE TERMINAL CORD

NETWORK

103A MODULAR INTERFACE

JACKS MODULAR

LINE

CORDS

D8W MODULAR

VOICE

TERMINAL CORD TERMINAL

CABLING

WIRING PLAN B –

USING MODULAR TERMINAL CORDS, CABLE EXTENSION

KITS (THIS KIT CONTAINS A 100– OR 200–FOOT

SINGLE–ENDED CABLE AND A MODULAR JACK). A JACK

PANEL, AND 2.5 FOOT JUMPER CORDS

MODEL 820 CONTROL UNIT

JACK

VOICE TERMINAL PANEL

103A MODULAR

JACK

NETWORK

INTERFACE

MODULAR

LINE

CORDS

DW8A–SE

D8W MODULAR SINGLE–ENDED JUMPER

TERMINAL CORD

CABLE

CORD

Figure 2—Typical Wiring Plans

Page 5

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