Daily Archives: April 1, 2016

What’s the alarm on the OptiX OSN 1800II board restarts after power-off

Summary: When the OptiX OSN 1800II device restarts after power-off, the SCC board

reports the HARD_BAD and MOD_COM_FAIL alarms and the HARD_BAD and

MOD_COM_FAIL alarms persist.

Product Family: WDM     Product Model: OptiX OSN 1800II

[Problem Description]

Trigger conditions:

This problem occasionally occurs (about a 1% probability) when OptiX OSN 1800II devices

using V100R005C10SPC100 or earlier versions restart after power-off.

Symptoms:

l The faulty SCC board reports the HARD_BAD and MOD_COM_FAIL alarms and the

HARD_BAD and MOD_COM_FAIL alarms persist.

l Impact on services:

− For the NE with only one SCC board: If this problem occurs, all data services on the local

NE are interrupted and cannot be automatically restored.

− For the NE with dual SCC boards: Data services on OTU boards can be automatically restored

after service interruption for 15 minutes. Data services connected to the faulty board are interrupted

and cannot be automatically restored.

Identification method:

Step 1 Check the alarms reported on the live network. If the HARD_BAD and MOD_COM_FAIL

alarms are displayed, go the Step 2.

Step 2 Perform a cold reset on the faulty board to identify the problem. If the fault is rectified after

the cold reset, this problem can be identified.

 

[Root Cause]

The resetting process of chips on boards using V100R005C10SPC100 and earlier versions has

problems, which result in that the board power-on occurs at a certain probability and the central

switching board cannot go online.

 

[Impact and Risk]

l For the NE with only one SCC board: If this problem occurs, all data services on the local NE are

interrupted and cannot be automatically restored. The alarms persist.

l For the NE with dual SCC boards: Data services on OTU boards can be automatically restored

after service interruption for 15 minutes. Data services connected to the faulty board are

interrupted and cannot be automatically restored. The alarms persist.

 

[Measures and Solutions]

Recovery measures:

l Cold reset the faulty SCC board.

Workarounds:

None

Preventive measures:

Upgrade the OptiX OSN 1800II to V100R005C10SPC200 or a later version (The NMS must

be upgraded to V200R014C50SPC200 accordingly).

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