The DRZ wavelength tunable LSX board reports a WAVE_LEN_OVER alarm, whereas the NRZ LSX board with fixed wavelengths does not. According to wavelength tests by the spectral analyzer, all wavelength offsets are within the specified range. That is, no excess wavelength offset occurs (the NE software version of the OSN 6800 is 188.8.131.52, and the NMS version is T2000 V2R6).
For the DRZ wavelength tunable optical module, the optical source itself controls the wavelength through the chip temperature, without being interfered by external factors. It is not allowed to adjust the wavelength offset of such optical modules by using software. In version R3C02B028, wavelength tunable optical modules are not monitored, and the wavelength offset threshold is changed from 0.5G to 5G.