2.14 Using The Add-On Expansion Modules
You can install optional add-on expansion modules to the DSU II common equipment base unit
to increase the line and station capacity of an installed system.
•
The JM408 expansion module provides an additional four lines and eight digital proprietary
stations.
•
The JM008 expansion module provides interface and ring generation for eight
industry-standard telephone devices.
Base Unit
Type
Base Unit Capacity
Expansion
Module Type
Total System Capacity
Lines
System
Stations
Lines
System
Stations
ISTs
J0408
4
8
one JM408
8
16
-
one JM008
4
8
8
J0816
8
16
one JM408
12
24
-
two JM408
16
32
-
one JM008
8
16
8
two JM008
8
16
16
one JM408 and
one JM008
12
24
8
J1632
16
32
one JM408
20
40
-
two JM408
24
48
-
one JM008
16
32
8
two JM008
16
32
16
one JM408 and
one Jm008
20
40
8
2.14.1
Using The JM408 Module
The JM408 expansion module provides to an installed system an additional four lines and eight
digital proprietary stations. The default numbering of the expanded lines and stations begin with
the next higher line or station port number from that provided by the host base unit. The
numbering continues sequentially from top module to bottom module if two modules are
installed. For example: The defaulted 8-line, 16-station base unit provides station ports 10
through 25 and lines 1 through 8. When installed, a JM408 expansion module provides station
ports 26 through 33 and lines 9 through 12 thus creating a 12 line by 24 station system.
Each expansion module provides a tip and ring pair as an emergency power failure circuit. This
circuit is connected to the first module-provided line.
DSU II Digital Telephone System
IMI66–132
Installing The DSU II Digital Telephone System 2 – 41
Summary of Contents for DSU II
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