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MERLIN 820
AT&T MERLIN 820 User Manual
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How to Use This Manual
WIRING PLAN C –
VOICE TERMINAL
USING MODULAR TERMINAL CORDS, TERMINAL EXTENSION
CORD(S), A JACK PANEL, AND 2.5–FOOT JUMPER CORDS
JACK
D8AF TERMINAL
EXTENSION
CORD
MODULAR
LINE
CORDS
D8W MODULAR
TERMINAL CORD
MODEL 820 CONTROL UNIT
PANEL
NETWORK
INTERFACE
JUMPER
CORD
WIRING PLAN D –
USING MODULAR TERMINAL CORDS AND TERMINAL
EXTENSION CORD(S)
MODEL 820 CONTROL UNIT
VOICE TERMINAL
D8AF TERMINAL
EXTENSION
CORD
MODULAR
LINE
CORDS
NETWORK
INTERFACE
D8W MODULAR
TERMINAL CORD
Figure 2—Typical Wiring Plans (contd)
Page 6
10
12
Table of Contents
Table of Contents
4
How to Use this Manual
6
FIRST: Perform the Tests in the "BASIC TROUBLE TESTS
6
SECOND: Determine Whether the Trouble Is Constant or
7
Intermittent
7
THIRD: Describe the Trouble
7
Procedure
7
Selected
7
SIXTH: Replace Faulty Components
8
An Overview of Your System
8
Basic Trouble Tests
13
Tests to Determine if the Trouble Is in Your System
13
Symptom-Based Tests
17
List of Symptom-Based Tests
17
Voice Terminal Does Not Ring
17
Cannot Make an Outside Call
18
Trouble with Indicator Lights, Speaker, or Ringing
19
Some Custom Features Do Not Work
23
All Voice Terminals Have no Lights and no Dial Tone (Entire System Down)
25
Voice Terminal Rings Constantly
29
General Tests
30
If Trouble Remains
33
How to Select the Correct Procedure
34
Test Sequence
34
Trouble on One Voice Terminal
36
Test A: Voice Terminal Test
36
Test B: Control Unit Test
42
Test C: Voice Terminal Cords and Cable Test
44
Test D: 2-Line/5-Terminal Expansion Module Test
52
Trouble on more than One Voice Terminal
56
Test A: Control Unit Test
56
Test B: Modular Line Cords and Network Interface
57
Test
57
Network Interface
58
Test C: 2-Line/5-Terminal Expansion Module
68
Voice Terminals Jack Test
71
Tel. Co. Lines Test
75
Trouble on an Accessory
78
Test A: for Auxiliary Power Devices
78
Auxiliary Power Unit
78
Voice Terminal Power Supply
80
Terminal
81
Test B: for Accessories Attached to a Voice Terminal
83
Test C: for Accessories Not Attached to a Voice
84
Terminal
84
Power Failure Transfer Telephone (PFTT)
84
Music-On-Hold Equipment
88
Paging System
89
Extra-Alert Devices
92
Line-Powered Alerts
97
Maintenance Exchange Procedures
101
Other manuals for AT&T MERLIN 820
Installation Guide
40 pages
Administration Manual
22 pages
4
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AT&T MERLIN 820 Specifications
General
Brand
AT&T
Model
MERLIN 820
Category
Conference System
Language
English
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