when the Occasional Failure to Go Online for TN11HSC1 Boards

Keywords: WDM, OptiX OSN 6800, OptiX OSN 8800 T16, OptiX OSN 8800 T32

Summary:

When TN11HSC is upgraded to V100R007C00SPC200, V100R007C00SPC300, or V100R007C02SPC200, there is a low probability that it fails to go online in an OptiX OSN 8800 T16 subrack, OptiX OSN 8800 T32/T64 slave subrack, or OptiX OSN 6800 slave subrack. When the fault occurs, the OSC performance is affected, possibly causing the NE to be unreachable by the NMS.

[Problem Description]

Trigger conditions:

  1. The TN11HSC1 board is used in an OptiX OSN 8800 T16 subrack, OptiX OSN 8800 T32/T64 slave subrack, or OptiX OSN 6800 slave subrack.
  2. The NE software is V100R007C00SPC200, V100R007C00SPC300, or V100R00
  3. A warm or cold reset is performed on the board.

Symptom:

The TN11HSC1 board occasionally fails to go online in an OptiX OSN 8800 T16 subrack, OptiX OSN 8800 T32/T64 slave subrack, or OptiX OSN 6800 slave subrack and this board is unreachable by the NMS when the NE is upgraded to V100R007C00SPC200, V100R007C00SPC300, or V100R007C02SPC200.

Identification method:

  1. Check whether the TN11HSC1 board is used in an OptiX OSN 8800 T16 subrack,OptiX OSN 8800 T32/T64 slave subrack, or OptiX OSN 6800 slave subrack.
  2. Query the version information and check whether the NE version is V100R007C00SPC200, V100R007C00SPC300, or V100R007C02SPC200 and whether the board version is 3.45.

 

[Root Cause]

The memory of the TN11HSC1 board is insufficient. When this board is used in an above-mentioned subrack, this board applies more memory space. Therefore, the memory application during the board software initialization occasionally fails, causing a board initialization failure. As a result, the board suspends in the BIOS state.

 

[Impact and Risk]

  1. When an NE on the live network is upgraded to the risky version, if the subrack is managed through the OSC on the TN11HSC1 board, the NE will be occasionally unreachable by the NMS and fail to be upgraded to the target version.
  2. When an NE on the live network is upgraded to the risky version, if the subrack is managed through other channels, the NE will be occasionally unreachable by the NMS and fail to be upgraded to the target version.
  3. If the NE on the live network is already of a risky version, the TN11HSC1 board will occasionally fail to go online when it is inserted into an above-mentioned subrack and be unreachable by the NMS.

 

[Measures and Solutions]

Recovery measures:

  1. Upgrade the NE to V100R007C00SPC300 and load the V100R007C00SPH301 hot patch.
  2. Remove the TN11HSC1 board and insert it to an OptiX OSN 8800 T32/T64or OptiX OSN 6800 master subrack. Then load the V100R007C00SPH301 hot patch to the subrack.
  3. Insert the TN11HSC1 board that has beenloaded with the hot patch back to the OptiX OSN 8800 T16 subrack, OptiX OSN 8800 T32/T64 slave subrack, or OptiX OSN 6800 slave subrack.

Workarounds:

None

Preventive measures:

Upgrade the NE to V100R007C02SPC300 or a later mainstream version.

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