AT&T System 85 manual Features, Power

7400A Data Module

Features

The basic features of the 7400A data module are:

DCP mode 2 operation only

Full-duplex, 10-bit start/stop, asynchronous operation

Asynchronous data rates of 0.3, 1.2, 2.4, 4.8, 9.6, and 19.2 kbps

Even, odd mark, and space parity options

Automatic answer option

Signal loss disconnect option

Autobaud

Autoparity

Long-break and triple-break disconnect options

Data features for modem pooling applications include:

EIA RS-232-D DTE interface, enchanced with CI2 and CH2 leads

Interface for D-lead control modems

Interface for Hayes-compatible modems

Data features for host or terminal applications include:

EIA RS-232-D DCE interface

Keyboard dialing and Hayes user interface emulation option

Answer only

Cyclic Ring-indicator option

Ignore DTR input option

Power

The stand-alone 7400A Data Module operates with power from a WP90110 L7 AC power con- verter. This is a modular AC to DC adapter that is normally plugged into a wall outlet. The Z77A Data Mounting has a built-in power supply for powering data modules in the multiple-mount arrangement.

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