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單項(xiàng)選擇題

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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多項(xiàng)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

單項(xiàng)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