AT&T System 85 manual 703A Data Service Unit DSU

703A Data Service Unit (DSU)

703A Data Service Unit (DSU)

The 703A Data Service Unit (DSU) is used with the 7406D voice terminal to provide asynchro- nous data communications through the switch. The DSU replaces the desk stand under the 7406D voice terminal and allows a data terminal (such as 610 BCT) to be connected to the 7406D and data calls to be made to and from the switch. (See Figure 2 below.)

FIGURE 5-2. Block Diagram of 703A Data Service Unit

Applications

The 703A DSU can be used with 7406D voice terminal connected to a DEFINITY G1, G2, G3, System 75, or System 85. Typical applications are users with data terminals requiring a large number of features.

Features

The 703A DSU provides the following features:

Selector for standard data rates of 0.3, 1.2, 2.4, 4.8, 9.6, and 19.2 kbps.

Asynchronous full-duplex operation

Automatic answering of data calls

Data terminal keyboard dialing

Parity switch (even / odd)

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