Dpm8 (Digital Port Module - 8 Circuits) - Vertical comdial DX-120 Installation And Maintenance Manual

DX-120 Installation and Maintenance Manual
APM4 - Analog Port Module
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All connections are via RJ-11 connectors along the bottom edge of the module. KSU1 is delivered with one
APM4 installed on ribbon connector J5 as standard equipment.
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APM4's may be installed on 408M/E-J5 (standard in KSU1:408M-J5), 408M/E-J2, or 408M/E-J3.
IMPORTANT
It is not possible to install an APM4 on both J2 and J3 on a single 408.
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When an APM4 is installed via J2 or J3, it takes the place of DPM8 modules that might be installed in those
locations. Therefore APM4 modules installed using J2 or J3 will reduce the total number of Digital Port
Modules (DPM8) possible.

DPM8 (Digital Port Module - 8 Circuits)

The DPM8 module expands the DX-120 system capacity of digital ports DET (Digital Executive Telephones) and
DSS consoles. Each digital port is comprised of a proprietary octal ASIC transceiver. There are three data
channels in operation at each digital port via the octal transceiver. One channel is used for call processing control
of digital terminal functions/operations and two channels are used for the digital voice channel requirements. The
DPM8 is controlled directly from the 408M/E; therefore, there is no heartbeat LED located on the DPM8.
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Each digital station interface is protected against circuit wiring shorts by an over-current protection Polyswitch.
The digital station circuit requires only one cable pair to operate and is not polarity sensitive.
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Physical connection of digital port terminals (DET and DSS) to the DPM8 module is made through convenient
RJ-11 connectors along the bottom edge of the module.
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DPM8 (Digital Port Module - 8 Port)
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