After an OptiX OSN 6800 NE Is Upgraded from V100R004C04 to a Later Version

After an OptiX OSN 6800 NE is upgraded from V100R004C04 to a later version, a slave subrack of the NE is unreachable by the U2000 due to incorrect TN11AUX02 jumper settings.

Product

OSN 8800, OTN

Fault Symptom

When an OptiX OSN 6800 NE was upgraded from V100R004C04 to V100R005C00 or a later version, slave subrack 4 on the NE was unreachable by the U2000 at the software activation stage.

Network Topology

None.

Cause Analysis

There are the following possible causes for a slave subrack to be unreachable by the U2000:

1. The SCC board in the subrack is faulty.
2. The network cable of the subrack is abnormal.
3. The AUX board in the subrack is faulty.

Procedure

1. Considering that the slave subrack was unreachable by the U2000 when the AUX board in the subrack was being activated, Huawei suspected that the AUX board was faulty.
2. Interchanged the AUX boards in slave subracks 3 and 4 and exchanged the jumper settings of the two AUX boards. Slave subrack 3 was still reachable by the U2000, but slave subrack 4 was still unreachable by the U2000. This information shows that the AUX board originally installed in slave subrack was normal.
3. Confirmed that slave subrack 4 was still unreachable after the SCC board in the subrack was reseated or replaced. In addition, the replaced SCC board was functioning properly after it was installed in a slave subrack on another NE. Therefore, the SCC board in slave subrack 4 was normal.
4. Checked the network cable connection. No fault was found.
5. Considering that slave subrack 4 was unreachable during the upgrade of its AUX board, Huawei compared V100R004C04 and V100R005C00 files and discovered that the logic of the AUX board had been upgraded from V100 to V130. During the logic upgrade from V100 to V130, to ensure that the extended subrack ID could meet the requirement of the new PCB version, the default jumper setting was changed from 1 to 0. After confirmation, Huawei learnt that the AUX board in slave subrack 4 was TN11AUX02.
   The TN11AUX02 board with a logic of V100 uses only J4, J3, and J2 jumpers to set the subrack ID, while the TN11AUX02 board with a logic of V130 uses J16, J15, J4, J3, and J2 to set the subrack ID.
   
   
6. Checked the jumper settings of the TN11AUX02 board. J15 and J16 were not capped. In V100R004C04, this setting matched the logic of V100. By default, when J15 and J16 are not capped, they indicate the value 1. After the NE was upgraded to V100R005C00, the logic version of the TN11AUX02 board was V130 and the default value of J15 and J16 jumpers changed to 0, causing a change in the ID of slave subrack 4. As result, the subrack ID became invalid and the subrack was unreachable by the U2000.
7. Reconfigured the jumpers on the TN11AUX02 board according to the information provided in the product documentation. The problem was then resolved.
   NOTE:

   For the TN11AUX01 board equipped with PCB VER.D, the issue will also occur on the board after an upgrade if the J15 and J16 jumpers on the board are not capped.

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