Which of the following ITU-T recommendations defines the OTN frame structure?
Answer(s): D
A two-fiber ring topology consisting of three NEs is arranged in the counterclockwise sequence as A, B, and C. Services between A and C occupy the 48th VC-12 timeslot in the first VC-4 on the short path, and services between B and C also occupy the 48th VC-12 timeslot in the first VC-4 on the short path. In this case, which of the following is the subnet type of the ring protection?
Answer(s): C
Which of the following statements about the sequence of a signal flow between the SDH interface and the cross-connect unit is correct?
Answer(s): A
The Kl and K2 bytes can transmit APS switching signaling, and can also indicate that the multiplex section signal fails.
Which of the following is the functional unit that provides high-speed signal interfaces and processes corresponding signals?
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