Apm4 (Analog Port Module - 4 Circuits); Dpm8 (Digital Port Module - 8 Circuits) - Comdial DX-80 Installation And Maintenance Manual

Each digital port (connects to Digital Executive Telephones and DSS Consoles) is comprised of a
proprietary octal ASIC (Application Specific Integrated Circuit) transceiver. There are three data channels in
operation at each extension 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.
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.
Physical connection of digital extension terminals, power failure telephones and CO lines to the 408M
module is made through convenient RJ-11 connectors along the bottom edge of the module.

APM4 (Analog Port Module - 4 Circuits)

The APM4 provides four separate analog device ports. This allows the DX-80 to support auxiliary office
equipment found on the business premises such as fax machines, PC/Mac modems and analog telephones
(single line telephones). The APM4 generates -30VDC and 20-25Hz, 50V square wave ringing for operation.
The APM4 is equipped with a Heartbeat LED that indicates processing activity on the PCB. (The APM4
peripheral processor is operating when the Heartbeat LED is flashing.)
The APM4 provides DTMF receivers for each analog port. Ancillary analog devices connected to APM4
analog ports must generate DTMF signaling. (Pulse dial (rotary-dial) telephones/equipment are not
supported.) 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.
APM4's may be installed on 408M/E-J5 (standard in KSU1:408M-J5), 408M/E-J2 or 408M/E-J3. (Note it is
not possible to install an APM4 on both J2 and J3 on any one 408.)
When an APM4 is installed via J2 or J3, they take 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-80 system capacity of digital ports DET (Digital Executive Telephones)
and DSS Consoles. Each digital port is comprised of a proprietary octal ASIC (Application Specific
Integrated Circuit) 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
P7290 IMM
DX-80 I
NSTALLATION AND
Figure 3: APM4 (Analog Port Module - 4 Circuits)
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AINTENANCE ANUAL