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

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热门试题

单项选择题

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