Comdial DX-80 Technical Manual page 22

Overview
The APM4 provides DTMF receivers for each analog port. Ancillary analog devices connected to
APM4 analog ports must generate DTMF signaling.
Pulse (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.
It is not possible to install an APM4 on both J2 and J3 on a single 408.
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.
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CAUTION
CAUTION
Comdial October, '03