Relationship between the reference input optical power, upper threshold, and lower threshold of an OPU on the NMS

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The lower threshold for reference input optical power is the reference input optical power minus 3 dBm. The upper threshold for reference input optical power is the reference input optical power plus 5 dBm. The upper and lower thresholds can be manually modified or automatically obtained after the reference input optical power is entered.
Reference input optical power refers to the optical power when the system runs properly with the best performance after deployment commissioning is complete.

After the reference input optical power, lower threshold for reference input optical power, and upper threshold for reference input optical power are set, the NMS compares the difference between the actual receive optical power and the reference input optical power of an optical port. If the difference is less than 2 dB, Normal is displayed. If the difference is greater than 2 dB and less than 4 dB, Warning Alert is displayed. If the difference is greater than 4 dB, Critical Alert is displayed.

Other related questions:
Relationship between the input reference value and the input upper and lower thresholds of the OPU on the NMS
Lower threshold for the reference input optical power = Reference input optical power �?3 dBm; Upper threshold for the reference input optical power = Reference input optical power + 5 dBm The upper and lower thresholds can be automatically obtained based on the reference input optical power or manually modified. The reference input optical power is the optimal optical power during normal system running after the system deployment commissioning is complete. After setting the reference input optical power and upper and lower thresholds for reference input optical power, the NMS compares the difference between the actual receive optical power and reference input optical power of the optical ports. If the difference is less than 2 dB, the input status is normal. If the difference ranges from 2 dB to 4 dB, the input status is warning. If the difference is greater than 4 dB, the input status is critical.

What is the operating temperature of boards and what are the upper and lower temperature thresholds
You can use the display temperature command to view the current card temperature and temperature alarm thresholds. In the command output, the Temperature.(C) field shows the current card temperature, the Upper field shows the upper temperature alarm threshold , and the Lower field shows the lower temperature alarm threshold. In a poorly ventilated environment, temperature alarms may be generated frequently because the card temperature is high and the upper temperature alarm threshold is small. To avoid this problem, clean the air filter of the device or increase the upper temperature alarm threshold. NOTE: The temperature thresholds are preset and you do not need to change them. If you have special requirements on the temperature, contact Huawei engineers.

Threshold of the input optical power of a WMU board in the OSN 6800
For the WMU board in the OSN 6800, its single-wavelength input optical power must be in the range of �?6 dBm to �?6 dBm.

Redundant range of an OTU board on an OTN device
The suggested redundant range is 10 km to 30 km.

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