Active/Standby Switching Cannot Be Performed After an SCC Board of the OptiX OSN 8800 Is Replaced

Active/Standby switching cannot be performed after an SCC board of the OptiX OSN 8800 is replaced.

Product

OptiX OSN 8800, OSN6800

Fault Type

System and Communication Unit

Symptom

An OptiX OSN 8800 NE at an office reports a file loss alarm. The TN51SCC board on the NE is then replaced with a new SCC board with NE software of a later version. The BIOS of the new SCC board, however, cannot be synchronized with that of the other SCC board on the NE. After the new SCC board is reset, the BIOS synchronization still fails and the active/standby SCC switching cannot be performed.

After the new SCC board is replaced with a normal SCC board from another NE, the alarm is cleared and the active/standby switching can be performed successfully.

After the new SCC board is inserted to one normal NE, active/standby switching also cannot be performed.

The versions of the SCC board running on the live network and the new SCC board are as follows:

• Version of the new SCC board: 5.51.5.26
• Version of the SCC board running on the live network: 5.51.4.24

Cause Analysis

The possible causes of the fault are as follows:

The version of the new SCC board is later than that of the other SCC board on the NE. The NE does not support smooth downgrade of the NE database and thus the new SCC board cannot function properly.

Procedure

1. Perform the following operations to identify the problem:
   1. Check the software version of the new SCC board and find that the version is 5.51.5.26.
   2. Attempt to downgrade the software of the new SCC board to 5.51.4.24 by inserting the new SCC board in a slave subrack.
   3. Insert the new SCC board back to the master subrack.
   4. Perform active/standby switching. The switching fails.
2. Set the jumpers on the new SCC board and insert it to the slot of the old SCC board so that the database of the new SCC board is cleared automatically.
3. After the new SCC board is started, remove it. In addition, remove the jumper caps on the board. After that, re-insert this SCC board back to the slot. For information on how to set jumpers on an SCC board, see "Replacing the SCC Board" in the Parts Replacement for OptiX OSN 8800 V100R002C02.

Result

The problem is resolved.

Reference Information

Conclusions and suggestions for this case are as follows:

Clear the databases of the new SCC board before the replacement. Then, replace an existing SCC board on an NE with the new SCC board. For more information, see "Replacing the SCC Board" in the Parts Replacement for OptiX OSN 8800 V100R002C02. After the new SCC board goes online, synchronization of software and database between the active SCC board and the new SCC board is performed automatically. When software and database synchronization is complete, perform active/standby SCC switching.

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