单项选择题
Which is a legitimate bandwidth matched pair?（）
A. DS-1; E1
B. DS-1; STM-1
C. OC-3; STM-1
D. STS-1; STM-1
E. OC-192; STM-192
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相关考题
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多项选择题
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 -
单项选择题
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 -
单项选择题
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
