SELF TEST AND FAULT ISOLATION

TM 11-7025-234-23

When configured as a multipoint, the V.29 modem uses the same training sequence and

structure as a modem in fast mode. If the master does not train, it can be trained

by releasing and depressing the slave DC Bus switch.

2-11. SELF TEST AND FAULT ISOLATION

The test switches and indicators built into the V.29 Modem assembly allow a rapid

four-step check of the data terminals, modems, and telephone lines. This procedure

can be used both to verify normal system operation and to isolate faulty equipment

in the event of failure. The results of each test step immediately verify the

operational performance of each unit in the system or provide a positive indication

of equipment failure. The modem also has a self-test feature. This feature links

the data in and data out circuits sending the receiver output to the transmitter,

completing the loop.

2-10