Figure 2-2. Mother Board Controls and Indicators (1 of 2)

ITM 11-7025-234-23

Lights when data terminal provides a Request to

Transmit data signal to modem transmitter.

Lights when modem transmitter is ready to accept

data from terminal.

Lights when power is on and modem is not in the TEST

mode.

Lights when received audio signal is detected.

When pressed, causes TEST indicator to blink,

terminates transmit and receive telephone lines in 600

ohms, and loops modem transmitter output to receiver

input through AGC.

When pressed, causes TEST indicator to blink, blocks

transmit input data, and clamps transmit data input to

a Space condition that can be traced through the

communications link. The receiving modem displays any

error outputs when its DATA CLAMP switch is also

activated, allowing bit error rate to be approximately

determined without having to use a test pattern

generator.

Mother Board Controls and Indicators (1 of 2)

2-2