Excessively large wavelength deviation reported by the WMU boards of OSN 6800

Question:
The LSX boards with adjustable DRZ reported the WAVE_LEN_OVER alarm, whereas the ones with NRZ fixed wavelengths did not report the alarm. When an optical spectrum analyzer was used for wavelength testing, the wavelength deviations are within the allowed range. No excessively large wavelength deviation is detected. (OSN 6800 NE version 5.51.3.25, NMS version T2000V2R6)
Root cause:
None
Answer.
The wavelengths from the light source of the DRZ adjustable optical modules are controlled by the core temperature without human interference. Wavelength deviation adjustment should not be performed by the software to such modules. V100R003C02B028 does not monitor adjustable optical modules for wavelength deviation, and the deviation threshold was changed from 0.5 GHz to 5 GHz.

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