单项选择题
A VC-4-4c consists of （）.
A. an STM-16
B. any four VC-4s
C. four contiguous VC-4s
D. four contiguous STM-4s
E. two groupings of four VC-4s
相关考题
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单项选择题
OnanONS15454nodeyoucantunnela（n）（）.
A. SDH circuit over a SONET network delivering it as an SDH signal
B. SDH circuit over a SONET network delivering it as a SONET signal
C. SONET circuit over an SDH network delivering it as an SDH signal
D. SONET circuit over an SDH network delivering it as a SONET signal -
单项选择题
Ifnode2isacceptinglinetimingfromnode1，node2willsend（）tonode1asitsSSMmessge.
A. AMI
B. DUS
C. ESF
D. PRS
E. SMC
F. B8ZS -
单项选择题
Whatprotectionmethodisusedin4FMS-SPRingnetworks？（）
A. Each fiber has half of its capacity reserved for protection.
B. Two fibers carry their full capacities while the other two fibers are reserved for protection.
C. The signal is sent simultaneously in both directions around the ring. The receiver determines which fiber to listen to based on signal quality.
D. The signal is sent simultaneously in both directions around the ring. The transmitter determines which fiber has the working bit set for the receiver to acknowledge.
