Apm4 (Analog Port Module - 4 Circuits) - Comdial DX-80 Technical Manual

DX-80 Installation & Maintenance
The fourth CO line port is equipped with CNG Fax Tone Detection circuitry. When programmed as a
"FAX" line, this circuit automatically engages the FAX tone detector. If FAX tone is detected, the
system routes the call to the analog port designated as the destination for fax calls.
Each digital port (connects to Digital Executive Telephones and DSS Consoles) is comprised of a pro-
prietary 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 pro-
cessing 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 sen-
sitive.
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.

1.8 APM4 (Analog Port Module - 4 Circuits)

The APM4 provides four separate analog device ports. This allows the DX-80 to support auxiliary
office equipment such as fax machines, PC/FAX modems, and analog telephones (single line tele-
phones). The APM4 generates -30VDC and 20-25Hz, 50V square wave ringing for operation.
Figure 1-5 APM4 (Analog Port Module - 4 Circuits)
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.
October, '03 Comdial 21