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

多项选择题

What are two major differences between MS-SPRing and SNCP？（）

A. In an MS-SPRing， all paths are protected.
B. MS-SPRing is always a high-order protection.
C. A low order circuit cannot be protected by an MS-SPRing.
D. There is no theoretical limit in the number of nodes in an SNCP ring.

单项选择题

In order to avoid misconnections due to a failed node in an MS-SPRing， Alarm Indication Signals （AISs） are sent on every channel normally terminating in that node.
What is the name of this process？（）

A. bridging
B. switching
C. squelching
D. nodal bypass
E. node failure insertion

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