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