1. Determine the faulty CPRI link by checking the CPRI LEDs on the panel of the TRX board.
2. Remove the cable corresponding to the CPRI port and install it again. Ensure that the cable is securely inserted. If the alarm is cleared, you can infer that the alarm is caused by improper cable connections.
3. Replace the cable corresponding to the CPRI port. If the alarm is cleared, you can infer that the alarm is caused by the faulty cable.
4. If the alarm persists after the cable is replaced, replace the optical module of the RXU. If the alarm is cleared, you can infer that the alarm is caused by the faulty RXU.