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All Service Boards Report the COMMUN_FAIL Alarm When the SCC in a Slave Subrack Is Faulty

Publication Date:  2012-07-25 Views:  56 Downloads:  0
Issue Description
In the first slave subrack of the OptiX OSN 6800, all the boards that have the software report the COMMUN_FAIL alarm twice, all the boards that do not have the software report the BD_STATUS alarm, but the AUX board runs normally. 
Alarm Information
The EFI, PIU, FAN, SCC, and ITL report the BD_STATUS alarm. Each of the FIU, OBU1, OAU1, NS2, LSX, and D40 reports the COMMUN_FAIL alarm twice with the parameters of 0x00 and 0x01 and 0x00 and 0x02. 
Handling Process
1. Query the optical power of service boards such as the OBU1 and the OAU1. The query result shows that the optical power of each board is normal. Therefore, the services boards and the AUX board work normally.
2. Perform hard reset on the AUX board. All service boards and the boards that do not have the software report the BD_STATUS alarm, and the AUX board cannot work. Therefore, the SCC is faulty.
3. Check the equipment on the site. The check result shows that all the working state indicators on the SCC are off. Replace the SCC in the slave subrack. Then, the fault is rectified. 
 
Root Cause
1. 0x00 and 0x01 of the COMMUN_FAIL alarm indicates that a 485A bus is faulty.
2. 0x00 and 0x02 of the COMMUN_FAIL alarm indicates that a 485B bus is faulty.
3. When multiple boards report 485A and 485B bus faults, it is likely that the SCC is faulty. 
 
Suggestions
1. The SCC in a subrack processes the overhead information of each service board. The SCC is connected to each board through a 485A or 485B bus.
2. The SCC in a subrack transmits the processed overhead information of each service board to the master subrack through the AUX board.
3. The AUX board in a slave subrack is connected to each service board through an Ethernet bus. Operations such as querying the optical power are transmitted by the Ethernet bus. 
 

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