AT&T System 85 manual Physical Appearance, Option switches, Self-Test button

703A Data Service Unit (DSU)

Disconnect sequence switch (escape, break)

Quiet option switch

Button for self-test and data call disconnect

Simultaneous voice operation

Speed matching to a lower speed of remote data endpoint

Remote loop test (from a distant data module)

EIA RS-232-C interface

Appearance of dialed number on the DTE screen (7406D02A only) during data call setup with the ASCII DTE

Display features for the 7406D02A on the attached CRT

Physical Appearance

Option switches

The option switches for setting the operating speeds, disconnect sequence, and parity are located on the bottom of the DSU.

Self-Test button

The Self-Test button is located on the rear of the data stand adjacent to the RS-232-C connector. It is recessed and can be depressed with a pointed object such as a straightened paper clip.

Jacks

The DSU contains four jacks. The handset cord jack is on the bottom of the DSU housing just under the left side of the housing. The mounting cord jack and the audio cord jack are on the bottom of the DSU housing just under the rear of the housing. The RS-232-C connector is on the rear of the DSU.

Mounting Options

The optional 703A Data Service Unit Data Module Base is installed on the 7406D Voice Terminal. When the 7406D is equipped with the DSU, it cannot be wall mounted.

Color Options

The DSU is available in black only.

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