AT&T System 85 manual 7400A Data Module, POWER/TEST light

7400A Data Module

7400A Data Module

The 7400A Data Module is a full duplex asynchronous data module designed to replace both the TDM (MTDM) and PDM (MPDM) for asynchronous applications. The 7400A provides a DCP interface to the PBX and an RS-232-D (formerly RS-232-C) interface to Digital Terminal Equip- ment (DTE) such as host computers, personal computers, and terminals or DCE modems in external modem pool installation.

Applications

The 7400A Data Module can be used with the DEFINITY G1, G2, G3, System 75, and System 85. It can be used in the modem pooling feature or for host access.

Physical Description

Dimensions

Note: The following dimensions are approximate.

Width = 7 inches

Depth (front and rear) = 8-3/4 inches

Height = 1-3/4 inches

Lights

POWER/TEST light

This red light goes on when the 7400A data module is on and flashes during all tests.

DATA light

This green light goes on during a data call and flashes when receiving an incoming call.

Display

The 16-character LCD display shows the status, option information, test information, and also information about the RS-232-D interface of the data module.

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