aturesOSN 7500
Technical Manual - System Description 8 Protection
Huawei Technologies Proprietary
8-4
8.2 Network Level Protection
8.2.1 SDH Trail Protection
The OptiX OSN 7500 can implement linear MSP and the MSP ring.
1. Linear MSP
Linear MSP is mainly used in the chain network. The OptiX OSN 7500 supports 1+1
and 1:N (N ≤14) protection schemes. In the 1:N protection mode, extra services can
be transmitted on the protection facility. In the linear MSP scheme, the switching time
is less than 50ms as specified in ITU-T Recommendation G.841.
2. MSP Ring
The OptiX OSN 7500 supports two-fiber MS shared protection ring, with the switching
time less than 50ms, as specified in ITU-T Recommendation G.841.
In line with ITU-T Recommendation G.841, the OptiX OSN 7500 supports four-fiber
MS shared protection ring, which provides ring switching and span switching in
addition to the similar functions of the two-fiber bidirectional MSP.
8.2.2 SDH SNCP
The OptiX OSN 7500 supports SNCP as required by ITU-T Recommendation G.841.
Even multiple service switching events occur at the same time, the switching time can
still be less than 50ms.
8.2.3 Protection for Interworking Service in Rings
As required by ITU-T Recommendation G.841, the OptiX OSN 7500 supports
protection for interworking services in rings, even in the rings with different protection
schemes (such as SNCP or MSP).
8.2.4 Fiber-shared Virtual Path Protection
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