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多項選擇題

SONET Path Terminating Equipment (PTE) requires which three line codes to be supported for DS1 and DS3 circuits?（） (Choose three.)

A.AMI
B.ESF
C.DUS
D.SSM
E.B3ZS
F.B8ZS

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單項選擇題

Which timing mode is appropriate for a SONET NE that is adjacent to a SONET NE using BITS-1 timing source?（）

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

單項選擇題

If node 2 is accepting line timing from node 1, node 2 will send （）to node 1 as its SSM message.

A. ESF
B. PRS
C. DUS
D. SMC
E. B8ZS