AT&T System 85 manual Switches

Digital Terminal Data Module (DTDM)

Lights

The DTDM is equipped with the following lights.

Terminal Ready

Call in Progress

Carrier On

Test in Progress

Check options

Receive Data

Send data

Test Result

Speed Indicator lights

The DTDM is equipped with seven indicator lights that show the speed at which the DTDM is operating.

Switches

Speed selector switch

The thumbwheel speed selector switch (located behind the side cover) selects data rates of LOW, 0.3, 1.2, 2.4, 4.8, 9.6, or 19.2 kbps.

Test switch

The Self-Test and Local Loop/Remote loop switches are located behind the side cover.

Option switches

The seven option switches are located behind the side cover.

Data Call Switch

The DTDM is equipped with a Data Call Switch labeled Originate and Disconnect.

Mounting Options

The DTDM is physically mounted to a 7403D or 7405D voice terminal. It attaches to the right side of the voice terminal. The entire unit can be desk or wall mounted with one exception: if the voice terminal is equipped with a Function Key Module, Call Coverage Module or Digital Display Module and a DTDM, it cannot be wall mounted.

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