The SC2 board reports the CRC4_CROSSTR alarm due to the board faulty.
Cause Analysis
The main causes may be the abnormal received optical power and the fault in the fiber or optical connectors.
Procedure
- The received optical power of the SC2 board is normal (The receiver sensitivity of the SC2 board is -48V.), whereas the SC2 board reports the alarm.
- The fault persists even when the fibers and connectors at the RM1 interface of the SC2 board are cleaned.
- Replace the SC2 board, and the fault is cleared. This indicates that the RM1 interface of the SC2 board is faulty.
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