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