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Maintenance Description
9-40 Issue 3 June 2001
Performance Monitoring (PM) 9
The DDM-2000 OC-3 Multiplexer uses PM to support proactive maintenance of
the network and tariffed service performance verification. Proactive maintenance
refers to the process of detecting degrading conditions not severe enough to
initiate protection switching or alarming but indicative of an impending hard or soft
failure. Hard and soft failures result in reactive maintenance.
Proactive maintenance consists of monitoring performance parameters
associated with the SONET sections, lines, and paths within the SONET network.
Table 9-5 lists the SONET performance parameters monitored by the DDM-2000
OC-3 Multiplexer. These parameters are thresholded to indicate degraded
performance. When a PM threshold is crossed, it is reported to the OS as a
threshold crossing alert (TCA). With TL1/X.25, all threshold crossings associated
with a particular path can be correlated, and the likely source of the degradation
can be identified.
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