PATRIOT VOICE LINK LOOPBACK TESTING

TM 11-6625-3056-12

2-7.

PATRIOT VOICE LINK END-TO-END TESTING (cont)

Press RESET:

Display will read 0. Display will remain 0 or a very low count if path is operating properly. If

display increases count rapidly, path is faulty.

2-8. PATRIOT VOICE LINK LOOPBACK TESTING

General

Use: Tests whole path (to and from).

Advantages: (1) Allows testing of multiplexers/demultiplexers. (2) Allows simple TS-3981 to test

long paths.

Disadvantages: Cannot isolate fault to one-half a path or the other (to or from). This disadvantage

can be overcome by end-to-end testing (para 2-7).

Procedure

Select input and output points of path under test.

On one end, connect DATA OUT from TS-3981 to data input of path under test.

Use

Interface Box if necessary.

On same end, connect data output from path under test to DATA IN of TS-3981. Use

Interface Box if necessary.

On other end, connect data output from path under test back to data input.

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