TM 11-6625-3041-12/TO 33A1-8-908-1
END-TO-END TESTING
Tests each half of a path (to or from) separately.
Use
Fault can be isolated to one-half of a path (to or from).
Advantages
A single multiplexer/demultiplexer cannot be end-to-end
Disadvan-
tested because its input/output data rates are different.
tage
Procedure
Select input and output points of path under test.
q
On one end, connect DATA OUT from SG-1139 to data input of
q
path under-test. Use BALANCED, UNBALANCED, or DIPHASE output
as required. Use Interface Box if necessary.
On other end, connect data output from path under test to
q
DATA IN of SG-1139. Use BALANCED, UNBALANCED, or DIPHASE
input as required. Use Interface Box if necessary.
If NRZ data signals are used (BALANCED or UNBALANCED data
q
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 other end, connect timing output from path under test to
TMG IN of SG-1139. Use BALANCED or UNBALANCED input as
required.
If an external STA CLOCK input is used, connect the station
q
clock signal from the path under test to SG-1139 STA CLOCK
input.
