
Performance Monitoring
Verilink IMUX User Manual 4-5
The Loopback A and Loopback B signals are DTE signal lines used
to request loopback operation as described in TR30.2/SP-2976.
NOTE:
The labelling is deceptive and does not immediately activate
loopbacks. Combinations of these lines determine loopback.
The following matrix (Table 4-4) identifies the loopback
behavior as defined in TR30.2 and the loopbacks supported
by the IMUX.
Table 4-4 Loopback Signals
Signal Line Combinations TR30.2 Control Behavior IMUX Behavior
Loopback A - off
Loopback B - off
Loopbacks off Loops off
Loopback A - on
Loopback B - off
Remote Line Loopback Loops off
(not supported)
Loopback A - off
Loopback B - on
Local Line Loopback Loops off
(not supported)
Loopback A - on
Loopback B - on
Local Digital Loopback Local Digital Loopback
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