单选题Why is an STM-1 2F-MS-SPRing NOT feasible？（）A An equal amount of working and protect bandwidth is required.B DCC bandwidth is not large enough to handle K1/K2 processing.C Switch times would exceed 50 ms for an STM-1 MS-SPRing ring.D There is not enough bandwidth in an STM-1 ring to justify MS-SPRing protection.
单选题
Why is an STM-1 2F-MS-SPRing NOT feasible？（）
A
An equal amount of working and protect bandwidth is required.
B
DCC bandwidth is not large enough to handle K1/K2 processing.
C
Switch times would exceed 50 ms for an STM-1 MS-SPRing ring.
D
There is not enough bandwidth in an STM-1 ring to justify MS-SPRing protection.
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