Trigger conditions of the CHAN_LOS alarm on OTN equipment

The possible causes are as follows:
1. A monitored wavelength is not received actually.
2. The laser on the related board at the peer-end site is off.
3. Optical power variations of the monitored wavelengths are too large.
4. The multiplexing or amplifier unit connected to the MCA board has an overly large attenuation value.
5. The OTU board in the upstream direction of the MCA board is faulty.
6. The MCA board that reports the alarm is faulty.

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