Physical Appearance - AT&T Callmaster Series Reference Manual

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.
5-50