Possible causes and handling measures if no wavelength information is displayed in the spectrum analysis data queried using the OMCA, MCA4, or MCA8 board

Possible causes are as follows:
1. The physical fiber connections of the OMCA, MCA4, or MCA8 board are different from logical fiber connections.
If this occurs, verify the physical fiber connections.
2. The optical path is abnormal.
If this occurs, check whether the optical path is set up. For example, check whether optical cross-connections are created, physical fiber connections are correct, or the laser on the OA board is properly turned on.

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