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Processor Data Module (PDM)
Trunk Data Module (TDM)
The Trunk Data Module (TDM) provides an RS-232-C DTE interface for connection to off-
premises private line trunk facilities or a switched network telecommunications network and a
DCP interface for connection to the digital switch.
The TDM can serve as part of a conversion resource for modem pooling. The conversion
resource performs the analog-to-digital and digital-to-analog conversions that allow the analog
and DCP data endpoints to communicate. A single conversion resource consists of a modem
and a TDM connected at the RS-232-C interface.
The TDM can no longer be ordered. It has been replaced by the MTDM.
Features
The TDM offers the following features:
Synchronous or asynchronous operation
Full- or half-duplex
Selected standard data rates up to 19.2 kbps
Automatic answer
Self-test
Physical Description
Switches
Originate/Disconnect
This switch is located on the front panel. It is used when originating and disconnecting
from a call for test purposes.
Self-Test
This switch is located behind the front faceplate. Pressing this button performs the self-
test.
LOC LOOP/REM LOOP
This switch is located behind the faceplate. It is used to perform the Local loop test or
Remote loop test.
Options
The option switches are located behind the front faceplate. There are 30 option
switches, 24 for options, and 6 spares.
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