Why is an STM-1 2F MS-SPRing not feasible?
A.
An equal amount of working and protect bandwidth is needed per span.
B.
Standards have not yet been defined for STM-1 MS-SPRings.
C.
There is not enough bandwidth in an STM-1 ring to justify MS-SPRing configuration.
D.
DCC bandwidth is not large enough to handle K1/K2 processing.
E.
Switch times would exceed 50ms on an STM-1 MS-SPRing.