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Fault Diagnosis Rules
- Obtain the customer's written authorization before performing any operation.
- Before performing any operation, ensure that service data will not be lost or has been backed up.
Observe the following fault diagnosis rules:
- Check the external components and then the internal components.
During troubleshooting, check external devices for faults (such as a power failure and peer device failure) first.
- Check the network and then network elements (NEs).
According to the network topology, check whether the network environment is normal and then check whether the NEs are normal. Determine which NE is faulty if possible.
- Check the high-speed signal alarms and then the low-speed signal alarms.
Alarm signal streams show that high-speed signal alarms often cause low-speed signal alarms. Therefore, clear high-speed signal alarms first.
- Analyze alarms of high severity and then analyze alarms those of low severity.
Analyze critical or major alarms first, and then analyze minor alarms.