Loopbacks - ADC HRU-419 HiGain User Manual

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OOPBACKS
This section contains information for loopbacks and testing.
Loopbacks allow you to perform isolated diagnostic tests on specific areas of
the circuit. The transmitted signal is returned to the sending device after
passing through a data communications link or network. This allows you to
compare the returned signal with the transmitted signal and to determine if
there is a problem with the circuit. Ideally, personnel performing loopback
testing are in direct communication with each other in order to correlate
messages displayed at both the HRU and HLU during the test.
shows the loopback diagram.
HRU-419 List 1 September 25, 1998

Loopbacks

Figure 21
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