Possible causes of a power threshold-crossing alarm on an OA board

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The possible causes are as follows:
1. If the upstream board outputs optical power at a normal level but the local board receives excessively high optical power, the cause may be that no appropriate attenuator is added.
2. The peer board or the upstream board outputs excessively high optical power.
3. The board at the local station is faulty.

Other related questions:
Possible causes of an ODUK_PM_OCI alarm on a board
The possible causes of an ODUK_PM_OCI alarm on a board are as follows: 1. An ODUK_PM_OCI alarm occurs on the corresponding board in the upstream. 2. A loopback occurs on the peer board. 3. No cross-connections or incorrect cross-connections are configured on the peer board.

Alarm threshold modification for E4 and E5 series OA boards
1. Run the following command to query the alarm thresholds. Pay attention that the board slot ID must be replaced with the actual slot ID and the slot ID must be in decimal format. :cfg-get-almth:5,1,1,sumiop PER-ALM-TH BID PORT PATH TH-TYPE TH-HIGH TH-LOW 5 1 1 sumiop 10 -320 Total records :1 2. Run the following nptp command to query the alarm thresholds on the board side. Pay attention that the board slot ID must be replaced with the actual slot ID and the slot ID must be in hexadecimal format. In the command outputs, TH-HIGH indicates the upper threshold in decimal format and TH-LOW indicates the lower threshold in hexadecimal format. After the lower threshold in hexadecimal format is converted into a value in decimal format, the lower threshold must correspond to the threshold queried in step 1. :nptp:5,13,31,1,0,1,0,94 ncmd 0: 05 13 31 00 00 01 00 01 00 94 00 00 00 0a ff ff fe c0 In the command outputs, 00 00 00 0a is the upper threshold and ff ff fe c0 is the lower threshold. 3. Run the following nptp command to query the alarm thresholds on the board side. Pay attention that the board slot ID must be replaced with the actual slot ID and the slot ID must be in hexadecimal format. The upper threshold is 0x12 in hexadecimal format, which is 18 in decimal format. That is, the upper threshold is 1.8 dB. :nptp:$bid,13,30,1,0,1,0,94,0,0,0,12,ff,ff,fe,c0 ncmd 0: 05 13 30 00 00 In the command outputs, 00 00 00 12 is the upper threshold and ff ff fe c0 is the lower threshold. 4. Query the alarm threshold again to check whether the alarm threshold is successfully modified. :cfg-get-almth:5,1,1,sumiop PER-ALM-TH BID PORT PATH TH-TYPE TH-HIGH TH-LOW 5 1 1 sumiop 18 -320 Total records :1 5. Replace the nptp command in step 2 with the sptp command and then deliver the command again without changing other parameters. In this manner, the command is saved to the NE software and will not be lost during a board reset. :sptp:5,13,30,1,0,1,0,94,0,0,0,12,ff,ff,fe,c0

Possible causes for the CHAN_ADD alarm on the MCA board of the OSN 6800/8800
The CHAN_ADD alarm indicates that single-wavelength signals are added. This alarm is generated when the MCA board detects wavelength addition after it scans the optical spectrum. The possible causes of the CHAN_ADD alarm are as follows: 1. The configurations for wavelength monitoring are incorrect. The received wavelengths are not configured as the monitored wavelengths. 2. The MCA board is faulty. The procedure for handling the CHAN_ADD alarm is as follows: 1. On the U2000, check whether the configurations for wavelength monitoring of the MCA board are incorrect. If the configurations are incorrect, modify the configurations to ensure that the monitored wavelengths and the number of monitored wavelengths are consistent with the received wavelengths and the number of received wavelengths. 2. If the alarm persists, test the optical spectrum data of the input optical signals using an optical spectrum analyzer. If the data is normal, the optical spectrum analyzer module of the MCA board may be faulty. When this occurs, replace the MCA board.

Calculation of the total input optical power of an OA board
The total input optical power of an OA board can be calculated using the following formula: Total input optical power = Single-wavelength nominal input optical power + 10lgN (N: number of in-service wavelengths).

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