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DX-120 Installation and Maintenance Manual
I
NSTALLING
THE
DX-120
KSU Components
KSU1, 408M
AND
KSU2 408E
The 408M module is installed at the factory into KSU1. Although this module has the same port configuration as
the 408E, they are not interchangeable. Each 408M and 408E is equipped with four CO line ports, one power
failure port, and eight digital extension Ports. See the following diagram to locate the various ports provided on the
408M/E.
The 408M/E is also the interface point for the various add-on modules of the DX-120 system. All peripheral
modules connect to the DX-120 via the 408M/E. See the following diagram for a reference to the various interface
connectors.
KSU Components (continued on next page)
408M: CPM Ribbon Cable
408E: CPM Connector Cable
(aprox. 1 meter long to extend out of KSU2
into KSU1)
Voice Processor Power
Connector
Extension Expansion
module connectors
DPM8 or APM4
COM4 Ribbon Connector
APM4 Ribbon Connector
8 digital extension ports
KSU1: 101-108
KSU2: 141-148
4 CO line circuits
KSU1: 800-803
KSU2: 808-811
Power Failure
Transfer Port
KSU1: 800
KSU2: 808
Summary of Contents for comdial DX-120
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