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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多项选择题

WhataretwomajordifferencesbetweenMS-SPRingandSNCP？（）

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