AT&T System 85 manual Trunk Data Module TDM, Features

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 It has been replaced by the MTDM.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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