When a fault occurs in the system, it is usually accompanied by a large number of alarms and
abnormal performance events. By analyzing this information, you can approximate the type
and location of the fault.
To review the alarms and performance events, do as follows:
Query the current or historical alarms and performance events on the U2000.
Review the running status or the severities of the alarms using the indicators on the open
rack and the boards.
The U2000 fault isolation capabilities can be affected by system faults, and are classified as
follows:
Comprehensive: You are able to obtain fault information for the entire network.
Accurate: You are able to obtain the current alarms, alarm generation time, and historical
alarms of the equipment. In addition, you are able to obtain the specific values of the
performance events.
Complex: In some cases, a significantly high number of alarms and performance events
can make analysis very difficult.
Dependent: Fault isolation is entirely dependent on the normal operations of the
computer, software, and communication equipment. If any of these are faulty, fault
isolation capabilities may be limited or entirely lost.
NOTICE
Before querying the performance data on the U2000, enable performance monitoring on
the U2000. Otherwise, the performance data will not be reported to the U2000.
Before querying the alarm or performance data on the U2000, ensure that the running time
of each NE is correctly set. Otherwise, the alarm and performance data will be incorrect or
not reported to the U2000.
During maintenance, after re-issuing the configuration to a NE, set the NE time to the
current time. Otherwise, the NE will operate at the incorrect default time.
The generation, detection, and transmission of an alarm varies with the OTU type and the type
of signals that the OTU receives. Alarm signal flow analysis allows you to quickly determine
where the fault is occurring.
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