POWER_DIFF_OVER alarm cause

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1. Optical signals have too large attenuation during the transmission, or an optical attenuator with high attenuation is added to the local board. As a result, the optical power of the active optical signals at the receive end greatly differs from that of the standby optical signals.
2. The transmit optical power of the active optical signals at the peer site greatly differs from that of the standby optical signals.
3. The detection circuit of the local board is faulty.

Other related questions:
Cause for the BEFFEC_EXC alarm
The possible causes of the BEFFEC_EXC alarm are as follows: 1. A fault occurs on an inter-site fiber or intra-site multiplexing link. 2. The signals are severely attenuated during line transmission. 3. The external environment is abnormal.

Causes of an R_LOS alarm
Client-side cause 1: On the optical connector of the local board, the pigtail is not connected, or is loosely or incorrectly connected. Client-side cause 2: The line attenuation is too large, or a fiber cut occurs on the line. Client-side cause 3: The board that reports the alarm is faulty. Client-side cause 4: If the board reporting the alarm is a 40G or 100G board, at least one wavelength has been missing from the receive end of the board. WDM-side cause 1: On the optical connector of the local board, the pigtail is not connected, or is loosely or incorrectly connected. WDM-side cause 2: The line attenuation is too large, or a fiber cut occurs on the line. WDM-side cause 3: The board laser at the peer site is turned off. WDM-side cause 4: A fault occurs on the transmit module of the board at the peer site or on the receive module of the board at the local site.

Cause of a device temperature alarm
Abnormal ambient temperature, a fan failure, or abnormal equipment temperature may cause a temperature alarm.

Cause for the ALM_DATA_RLOS alarm on the LOG board
The ALM_DATA_RLOS alarm indicates that the receive end of the Ethernet port has no data. The board periodically checks the total number of received bytes and compares them with the previous check results. If there is no change, the board does not receive data and therefore reports this alarm.

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