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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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