Signal label
The signal label contains information about the signal that is part of the VC. The
signal label indicates whether the VC is unequipped, whether it is a structured signal,
which type of mapping is used or whether it is an AIS (Alarm Indication Signal).
Signal degrade thresholds
The signal degrade threshold can be set for the Multiplex Section (MS), VC-12, VC-3,
and VC-4 levels. The signal degrade threshold determines when a signal is considered
degraded. Two parameters can be set:
• number of errored blocks per second
• number of adjacent bad seconds.
The signal is considered degraded, when during the defined number of bad seconds the
signal contains more than the defined errored blocks per second. This causes an alarm
STM-n Moderate Block Error Rate (n is 0, 1 or 16) or VC-n Moderate Block Error
Rate (n is 12, 3 or 4).
On VC-12, VC-3 and VC-4 level the signal degrade threshold is also used as a
switching criterion for SNC/N protection switching. If the signal is determined
degraded an SNC/N protection switch is performed. SNC/N Protection is described in
the chapter ″ Path Provisioning and Protection″.
Traffic maintenance
Termination points (TPs)
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9-8
Alcatel-Lucent - Proprietary
See notice on first page
365-312-807R7.2
Issue 4, May 2007
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