Verilink IMUX (880-503137-001) Product Manual - Manual (Page 37)

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