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.

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？（）