A、fibers are terminated incorrectly on a node

B、the channel number in the received K1 byte is not identical to the channel number transmitted in the K2 byte

C、the channel number in the received C1 byte is not identical to the channel number transmitted in the C2 byte

D、the channel number in the received C2 byte is not identical to the channel number transmitted in the C1 byte

E、the channel number in the received K2 byte is not identical to the channel number transmitted in the K1 byte