單項選擇題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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1.單項選擇題On an ONS 15454 node you can tunnel a（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

3.單項選擇題What protection method is used in 4F MS-SPRing networks？（）

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.

4.單項選擇題In SDH， what is the name of the embedded Data Communication Channel （DCC） in bytes D1-D3？（）

A. the DCC-E
B. the DCC-M
C. the DCC-R
D. the Line DCC
E. the Section DCC

5.單項選擇題SDH Code Violations （CVs） totals in the PM tables are actually an accumulation of the number of（）.

A. J0 errors detected in a in a specified interval
B. errors detected in a given Errored Seconds （ES）
C. errors detected in a given Severely Errored Seconds （SES）
D. errors the encryption algorithm detects in a specified interval
E. Bit Interleaved Parity （BIP） errors detected in a specified interval