Description
This alarm is reported when the peer end sends a defect indication signal to the local end because the alarm SDH/SONET MS Alarm Indication Signal or the alarm SDH/SONET MS Excessive Bit Error Rate is detected on the optical RX port of the peer end.
Parameters
Cabinet No. Cabinet number of the faulty board
Subrack No. Subrack number of the faulty board
Slot No. Slot number of the faulty board
SDH/SONET Port No. SDH/SONET port number
Impact on the System
Alarm Severity Alarm Impact
Major The data carried over the optical port is lost, and the services carried over the optical port may be disrupted.
System Actions
None
Possible Causes
The working mode of the local optical port is set incorrectly. The local optical module is not securely installed or not in position. The local optical connector is not securely installed.
The local optical connector is dirty. The local optical module is faulty. The local optical sub-board is faulty.
On the peer end, the configuration of the optical port is incorrect, the optical connection is faulty, the optical module does not match the optical fiber, or the device is faulty.
The optical transmission link is faulty.
Procedure
Check the working mode of the local optical port on the M2000.
Run the MML command DSP STM1 to check whether the working mode of the local optical port is set correctly. (Check the transmit clock settings based on the network plan, and check the consistency of frame format and multiplexing mode between the local and peer end.)
Y => The working mode of the local optical port is set correctly. Go to step 2. N => The working mode of the local optical port is set incorrectly. Go to sub-step b. a.
Run the MML command SET STM1 to change the working mode of the local optical port.
Check whether the alarm is cleared.
Y => The alarm is cleared. No further action is required. N => The alarm is not cleared. Go to step 2.
b. 1.
Check that the local optical module is in position on site.
Run the MML command DSP SFP to check whether the local optical module is in position.
Y => The local optical module is in position. Go to step 3. a.
N => The local optical module is not in position. Go to sub-step b. Reinstall the optical module on the local board securely.
Check whether the alarm is cleared:
Y => The alarm is cleared. No further action is required. N => The alarm is not cleared. Go to step 3.
b.
Check that the connector of the optical fiber is fixed to the optical module on the board securely on site.
Reinsert the connector of the optical fiber into the optical module on the board securely. Check whether the alarm is cleared.
Y => The alarm is cleared. No further action is required. N => The alarm is not cleared. Go to step 4.
a. 3.
Clean the connector of the local optical fiber on site.
Remove the connector and clean it by using absorbent cotton with absolute alcohol. Then, insert the connector properly.
Check whether the alarm is cleared.
Y => The alarm is cleared. No further action is required. N => The alarm is not cleared. Go to step 5.
a. 4.
Replace the optical module on site. Replace the optical module.
Check whether the alarm is cleared.
Y => The alarm is cleared. No further action is required. N => The alarm is not cleared. Go to step 6.
a. 5.
Check that the local optical sub-board works properly.
Connect the TX port of the optical sub-board and its RX port by using an optical fiber for loopback.
Check whether the alarm is cleared.
Y => The alarm is cleared. You can infer that the local optical sub-board is damaged. Go to sub-step b.
N => The alarm is not cleared. Go to step 7. a.
Replace the board.
Check whether the alarm is cleared.
Y => The alarm is cleared. No further action is required.
N => The alarm is not cleared. Reinstall the original board. Go to step 7. b.
6.
Check that the peer device with the optical port works properly.
Contact the maintenance engineers responsible for the peer optical device, and ask them to check whether the optical port configuration, cable connection, and functionality of the peer device are proper.
Y => The optical port configuration, cable connection, and functionality of the peer device are proper. Go to step 8.
a. 7.
N => The optical port configuration, cable connection, or functionality of the peer device is improper. Go to sub-step b.
Contact the maintenance engineers responsible for the peer optical device, and ask them to rectify the fault on the peer optical device.
Check whether the alarm is cleared.
Y => The alarm is cleared. No further action is required. N => The alarm is not cleared. Go to step 8.
b.
Check that the optical transmission link works properly.
Check for the faults in the optical transmission link, and rectify the faults. Check whether the alarm is cleared.
Y => The alarm is cleared. No further action is required.
N => The alarm is not cleared. Contact Huawei Customer Service Center. a.
8.