单项选择题

Which timing mode is appropriate for an SDH NE that is adjacent to an SDH NE Bits-1 timing？（）

A. DUS
B. line timing
C. loop timing
D. internal timing
E. through timing

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多项选择题WhichtwocanbetransportedinoneAU-4？（）

A. 3 E3
B. 4 E4
C. 64 E1
D. 21 E1 and 2 E3
E. 42 E1 and 2 E3

单项选择题HowisSNCPandMS-SPRingtrafficreroutedduringaprotectionswitchwhenacompletefibercablecutoccurs？（）

A. SNCP traffic is switched from the first node that recieves the AIS. MS-SPRing traffic is rerouted from the first in the ring.
B. SNCP traffic is selected at the destination node in the ring. MS-SPRing is rerouted from the originating node in the ring.
C. SNCP traffic is rerouted from the originating node in the ring. MS-SPRing traffic is rerouted from the originating node in the ring.
D. SNCP traffic is selected at the destination node in the ring. MS-SPRing traffic is rerouted from the last reachable node in the ring.

单项选择题AVC-4-4cconsistsof（）.

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

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

Which timing mode is appropriate for an SDH NE that is adjacent to an SDH NE Bits-1 timing？ （）

Which timing mode is appropriate for an SDH NE that is adjacent to an SDH NE Bits-1 timing？（）