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Anomalies Occur After Main Subrack Becomes Extended Subrack

Publication Date:  2012-08-12 Views:  87 Downloads:  0
Issue Description
 Change the running OptiX OSN 3500 from a main subrack into an extended subrack. Mount the extended subrack to a newly created OptiX OSN 3500. Query the physical slots of the extended subrack. It is found that the boards in the extended subrack fail to be displayed and that the tributary boards in the extended subrack are displayed as off-service on the T2000. 
Alarm Information
Null
Handling Process
1.Check the connection between the main subrack and the extended subrack. It is found that the connection is normal.
2.Perform warm reset on the SCC board and the AUX boards in the main subrack and in the extended subrack. It is found that the problem persists.
3.Remove the off-service boards and then insert the boards back to force the boards to perform cold reset. Then, the boards obtain the new slot IDs. The problem is solved. 
 
Root Cause
The possible causes are as follows:

1.The connection between the main subrack and the extended subrack is faulty.
2.The SCC board in the main subrack and the AUX boards in the main subrack and in the extended subrack are faulty.
3.The tributary boards in the extended subrack are not reset and thus the correct slot IDs cannot be obtained. 
 
Suggestions

The following part considers the UXCSB as the cross-connect board of the main subrack and describes the precautions for the connection between the main subrack and the extended subrack.

  • Cable connection between the UXCSB and the XCE: The EXA and EXB ports on the UXCSB board in slot 9 are connected to the EXA ports on the XCE board in slots 59 and 60. The EXA and EXB ports on the UXCSB board in slot 10 are connected to the EXB ports on the XCE board in slots 59 and 60. See Figure 1.
  • The EXT port on the AUX board in the main subrack is connected to the EXT port on the AUX board in the extended subrack. See Figure 1.
  • Cover the J9 jumper on the AUX board in the main subrack with the jumper cap and maintain the J9 jumper on the AUX board in the extended subrack uncapped.
  • Do as follows to reconstruct a running main subrack into an extended subrack:
    1. Remove the SCC board, line board, and certain unused tributary boards.
    2. Connect the EXT ports on the two AUX boards and remove the J9 jumper on the AUX board in the extended subrack.
    3. Remove the two cross-connect boards.
    4. Insert two XCE boards instead and connect the two XCE boards to the UXCSB boards in the new main subrack.

    After the two cross-connect boards are removed, the extended subrack has no cross-connections. Hence, the tributary boards in the extended subrack are automatically reset. After the J9 jumper is removed from the AUX board, the tributary boards can obtain the new slot IDs (that is, the original ID plus 50). After performing the operations, you need not remove the tributary boards and then insert the boards back again after the configuration.

Figure 1 Cable connection between the main subrack and the extended subrack 
  

END