Hello, everyone！
During service commissioning, we often need to handle many optical power-related problems. Today, I'd like to share a case about input optical power of the OA board is greater than the target value.
Problem Description：The following alarm information is displayed during commissioning:
The possible cause is that the EVOA at the receiving end of the line is not connected.
We can try to solve the problem in the following ways.
1. Search for OCh trails that traverse the OA board.
In the main topology of the U2000, double-click the NE housing the OA board to start the NE panel. Find the related WDM trails that traverse the OA board.
2. Check whether the output power of the OA board at the upstream site is normal.
3. Check whether the attenuation of the EVOA that first receives signals and is connected to or embedded in the OA board is normal. (The attenuation may have been set to the maximum value.)
4. Modify the attenuation of the EVOA and check whether the input power of the OA board changes. If the input power of the OA board remains the same, the EVOA is not actually connected.
That is all, thank you!
