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Protection
Network Level Protection
3.2
3.2.1 SDH Trail Protection
3.2.2 SDH SNCP
3.2.3 Protection for Interworking Service on
Rings
3.2.4 Fiber-shared virtual path Protection
3-4
For the OptiX OSN 3500, trail protection may occur at either the multiplex section (MS)
or the path in the modes of linear MSP and multiplex section protection (MSP) ring.
1. Linear MSP
Linear MSP is mainly used in linear networking topology. The OptiX OSN 3500
supports 1+1 and 1:N (N ≤14) protection schemes in the point-to-point linear
networking topology. In the 1:N protection mode, additional services are supported to
be transmitted on the protection system. 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 3500 supports shared optical path protection of two MSP rings. That
is, it supports two MSP rings on one optical interface.
The OptiX OSN 3500 supports 2-fiber MS shared protection ring, with the switching
time less than 50ms, as specified in ITU-T Recommendation G.841.
Moreover, in line with ITU-T Recommendation G.841, the OptiX OSN 3500 supports
4-fiber bidirectional MS shared protection ring comprising ring switching and span
switching. It other functions are similar to those of the 2-fiber bidirectional MSP.
The support of OptiX OSN 3500 to SNCP is fully in line with the requirements
stipulated in ITU-T Recommendation G.841. Even multiple service switching events
occur at the same time, the switching time can still be less than 50ms.
When there are more than one interworking routes existing between the rings,
inter-ring service protection can be enabled. For two rings in Dual Node
Interconnection (DNI) mode, ITU-T Recommendation G.842 specifies the protection
scheme for interworking services in rings with different protection schemes (such as
SNCP or MSP). The support of the OptiX OSN 3500 to the DNI mode fully conforms
to the requirements of ITU-T Recommendation G.842.
The SDH network protection mechanism specified by ITU-T is primarily based on ring
networks. As for the mesh networking mode, definitely they fail to enjoy satisfactory
protection modes, as they cannot be detached into a series of optical ring networks.
By virtue of features of the OptiX series products, together with the in-house
OptiX OSN 3500 TM - SD
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