Lucent Technologies LambdaXtreme Alarm Messages And Trouble Clearing Manual page 76

Loss of Signal (LOS)
SUPVY Link Failures
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SUPVY Data Link Failure
During normal operation, adjacent SUPVY circuit packs exchange
messages to check for data link integrity. If a SUPVY circuit pack
doesn't detect these messages, it will raise the
alarm condition. This alarm will be supporesed if an OA
Failure
circuit pack has failed or been removed, if OSC LOS is detected, or if
Incoming SUPVY Channel LOS or LOF is detected.
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See notice on first page
Maintenance
SUPVY Data Link
365-575-783R1.1
Issue 1, June 2002