General Model and Methods of Fault Locating
Abnormal State of a Service Processing Board
Troubleshooting Service Interruptions
Troubleshooting Transient Service Interruptions
Troubleshooting Pointer Justification
Troubleshooting Protection Switching Faults
Troubleshooting the NEs Being Unreachable
Troubleshooting Orderwire Faults
Troubleshooting Service Packet Loss