AT&T Merlin 820 Service And Maintenance Manual page 9

How to Use This Manual
Model 820 Voice
Terminals
Power
Warning
10
11
Normal
Admin.
Area Code
Toll Prefix
12
Tone Pulse
13
14
Tel. Co.
Lines
On
Off
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
2–LINE/5–TERMINAL
EXPANSION MODULE (SEE NOTE)
15 20
16 21
17 22
23
18
24
19
C
A
B D
Cartridge Type I
FEATURE PACKAGE 2
25
26
27
Cartridge Type II
28
T R
29
ON OFF
PAGING
SIGNAL
Cartridge Type III
POWER FAIL LINES
E G
A
F H
1 2 M1 M 2
BACKGROUND MUSIC
MUSIC ON
HOLD
EXTRA ALERT
B