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[多选] 对于OP保护,下面说法正确的是Which of the following statements about the OP protection are true?()
A.既可以实现通道保护,也能实现复用段保护It can implement both channel protection and multiplex section protection. B.倒换时,由NCP下发命令,进行倒换NCP will issue associated commands to perform switchover. C.OP单板能检测到误码并进行倒换 The OP board can check the BER to perform switchover. D.在OTN设备中,采用最多的是光层保护方式。For OTN equipment, optical-layer protection is most commonly used.
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