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Regarding the optical power commissioning of the RAU2 board, which of the following description is correct? (Multiple choice)

Regarding the optical power commissioning of the RAU2 board, which of the following description is correct? (Multiple choice)
A . Commissioning RAU2 before the board, must first disable their team function, after closing plate Raman laser
B . Make sure all connectors are connected before turning on the Raman laser
C . Because the RAU2 board has EVOA built in, the Raman gain needs to be set directly to the maximum gain of the supported fiber type
D . When using MONO or MOWS to measure online optical power, both need to compensate 20dB

Answer: BCD

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