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After Intra-board Protection Is Configured and the Target Optical Power Is Set on the ROAM Board, Output Optical Power Fails to Reach the Target Optical Power with Any Change in the Input Optical Power

Publication Date:  2012-07-25 Views:  68 Downloads:  0
Issue Description
After intra-board protection is configured and the target optical power is set on the ROAM board, input optical power fails to reach the target optical power with any change in the input optical power.
The board software starts adjusting optical power in the following conditions:
1. The optical cross-connection system is configured in automatic mode where the NE software automatically computes the target optical power.
2. The optical cross-connation system is configured in manual mode and users set target optical power of a single wavelength.
3. When the board software works, the NE software issues the stored value of target optical power.
4. The alarm of low optical power ends.
5. The NE software protocol (APE) issues the command of dispersion adjustment.
In the preceding 5 cases, the board software starts one time of the target optical power adjustment to achieve power equilibrium.
But in other cases, the ROAM board will not adjust the output optical power to the target value if the input optical power of the ROAM board changes. 
Alarm Information
Handling Process
When the input optical power changes in other cases than the above five, the optical power of the ROAM board can be changed to non-current values and then restored to the current value. (For example, the current value is -19. Change it to other values close to -19 and try not to cause service problems; then restore the current value of -19.) 
Root Cause
If the ROAM board is involved in a ring network, the instant adjustment of output optical power according to input optical power will lead to a cyclic adjustment status of the ROAM board and thus optical power jitter.