Reason for VOADATA_MIS alarm reporting and VOA value downloading failure during OA board replacement

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OA boards are equipped with EVOAs that support different minimum values ranging from 0.5 dB to 1.5 dB. For example, if the EVOA of an OAU board is set to 0.5 dB, after the board is faulty and is replaced by a board whose minimum EVOA value is 0.6 dB, the VOADATA_MIS alarm is reported, the VOA value fails to be downloaded, and the default value 21.5 dB is restored.
To avoid this, record the EVOA, gain, and output optical power values of the faulty board before board replacement. If the VOADATA_MIS alarm is reported during the replacement, manually adjust the EVOA and gain values of the new board to ensure that the output optical power of the new board is the same as that before the replacement. If the board does not report the VOADATA_MIS alarm, you do not need to adjust the board settings.

Other related questions:
Reason for the failure to report alarms by boards in a subrack when a large number of SHELF_AREA_POWER_OVER alarms are reported
The SHELF_AREA_POWER_OVER alarm indicates that the nominal power consumption of a subrack section exceeds the specified threshold. This alarm is reported when the total nominal power consumption of boards in a subrack section of an NE is greater than or equal to the power consumption threshold of the subrack section. This alarm is reported on the system control boards, such as SCC and 16XCH/16UXCM. If the alarm is present, the subrack is overloaded. When this occurs, you need to remove boards from the corresponding subrack section as required. If the subrack is running in overloaded state for a long time, the power supply to the subrack may be abnormal or interrupted.

Reason of the failure to select TN54TOA board ports during E2E STM-16 service configuration on the board
You need to set the working mode for the TN54TOA board. In the window for configuring the working mode of the board, specify the port working mode of the specific channel. Then, you can configure services properly.

Cause why the VOA embedded on an OA board on the main optical path of a coherent system must be configured on the OUT port of the board
In a coherent system, the VOA embedded on an OA board must be configured on the OUT port of the board. This position change helps adjust the incident optical power and also helps adjust the input optical power of the receive-end OA board in the downstream direction. This requirement decreases non-linear effect and helps improve the system performance.

Whether the OA rated optical power is configured based on the nominal value of each board or must be the same based on the output power values of all OA boards for the OPA feature
For the OPA function, the rated optical power of OA boards needs to be set based on the OA board types on the live network. The nominal single-wavelength optical power of each OA board is used as reference.

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