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Certain Bit Errors Are Reported on SDH Line

Publication Date:  2012-07-24 Views:  68 Downloads:  0
Issue Description

The OptiX OSN 1500, OptiX OSN 2500, and OptiX OSN 9500 are deployed on a network. The 24-hour BER test is performed on the SDH line for three times. Each time the BER test is performed, the SDH analyzer reads certain B3 bit errors and unavailable seconds (UASs). Check the history performance events. It is found that the HPBBE performance events occur every day. 


Alarm Information


Handling Process
1.It is found that the transmit power and receive power at each port on the line are normal.
2.It is found that the fiber connection of the OptiX OSN 1500 and the OptiX OSN 9500 is incorrect. The L-16.1 port at a station is connected to the L-16.2 port at another station. Replace the CXL board in slot 4 of the OptiX OSN 1500 with the CXL board in slot 5 of the CXL board in slot 4. It is found that the 24-hour BER test can be passed. 
Root Cause
 Check the receive power, transmit power, and the fiber connection of the SDH line.