TM 11-6625-3041-12/TO 33A1-8-908-1
Tests whole path (to and from).
Use
Allows testing of a single multiplexer/demultiplexer.
Advantage
This can be done
Cannot isolate fault to one-half of a path.
Disadvan-
tages
q Select
input and output points of path under test.
Procedure
q On
one end, connect DATA OUT from SG-1139 to data input of
path under-test. Use BALANCED, UNBALANCED, or DIPHASE output
as required. Use Interface Box if necessary.
q On
same end, connect data output from path under test to
DATA IN of SG-1139. Use BALANCED, UNBALANCED, or DIPHASE
input as required. Use Interface Box if necessary.
q On
other end, connect data output from path under test back
to data input (loopback).
q If
NRZ data signals are used (BALANCED or UNBALANCED data
outputs and inputs) and an external STA CLOCK input is not
used:
On one end, connect TMG OUT from SG-1139 to timing input of
path under test. Use BALANCED or UNBALANCED output as
required.
On same end, connect timing output from path under test to
TMG IN of SG-1139. Use BALANCED or UNBALANCED input as
required.