PATRIOT VOICE LINK END-TO-END TESTING

TM 11-6625-3056-12

2-7.

PATRIOT VOICE LINK END-TO-END TSTING

General

Use: Tests one-half of a path (to or from) at a time.

Advantages: Fault can be isolated to one-half of a path or the other (to or from).

Disadvantages: (1) Multiplexers/demultiplexers cannot be end-to-end tested because their

input/output date rates are different. (2) For some system on nonlocal testing, the path may be so

long that two TS-3981s would be required. Both of these disadvantages can be overcome by

loopback testing (para 2-8).

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

Use

Interface Box if necessary.

Set TS-3981 controls as follows:

POWER

PATTERN

LONG

OPERATION

CORRELATOR LOOP

OPEN

DATA ON/OFF

RATE SELECT

As required for path under test

DISPLAY SELECT

ERRORS

ACTIVITY indicator will be lit.

Press SINGLE ERROR several times:

Display will advance one count each time SINGLE ERROR is pressed which indicates setup

is proper.

2-13