Friday, June 3, 2016

The SC2 Board Reports the CRC4_CROSSTR Alarm

The SC2 board reports the CRC4_CROSSTR alarm due to the board faulty.

Fault Category

Optical Supervisory Channel Unit
CRC4_CROSSTR

Symptom

The SC2 board in the OptiX Metro 6100 reports the CRC4_CROSSTR alarm.

Cause Analysis

The main causes may be the abnormal received optical power and the fault in the fiber or optical connectors.

Procedure

  1. 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.
  2. The fault persists even when the fibers and connectors at the RM1 interface of the SC2 board are cleaned.
  3. 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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