Under the ADM configuration in the STM-16 level two-fiber bidirectional multiplex section shared protection ring, the service protection situation is:

Under the ADM configuration in the STM-16 level two-fiber bidirectional multiplex section shared protection ring, the service protection situation is:
A . Two circuit boards back up each other
B . Half of the capacity of one board is used to protect half of the capacity of the other board
C . Two circuit boards, one master and one backup
D . The two circuit boards have nothing to do with each other

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Answer: B