For a 10G OTU board, the receiving end optical module uses PIN module, then which of the following receiving power is within the normal receiving range of the board?

For a 10G OTU board, the receiving end optical module uses PIN module, then which of the following receiving power is within the normal receiving range of the board?
A . -9dBm
B . -19dBm
C . 9dBm
D . 19dBm

Answer: A

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