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Maintenance Description
Issue 1 December 1997 9-27
Tests 9
Transmission Tests 9
Technicians can use DDM-2000 OC-12 Multiplexer internal testing capabilities for
installation and manual troubleshooting. DS3 test signal generators and detectors
are integrated in the system, eliminating the need for external test equipment to
do DS3 transmission testing.
The DDM-2000 OC-12 Multiplexer lets technicians test specific signals and
system components. For example, technicians can manually enable the
integrated test signal generators and detectors for a DS3 low-speed interface.
These signal tests can be run selectively in the multiplex or demultiplex direction.
Refer to the test-trmsn-t3 command in Section 11, "Commands and
Reports."
Operations Interface Tests 9
The DDM-2000 OC-12 Multiplexer also provides tests for LED indicators, office
alarms, and the system controller. Refer to the test-led, test-alm, and
test-sysctl commands in Section 11, "Commands and Reports."
Performance Monitoring (PM) 9
The DDM-2000 OC-12 Multiplexer uses PM to support proactive maintenance
and tariff verification of the network. 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 9-4 lists the SONET and DS3 performance parameters monitored by the
DDM-2000 OC-12 Multiplexer. These parameters are thresholded to indicate
degraded performance. When a PM threshold is crossed, it is reported to the OS
connected to an TL1/X.25 link. 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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