aturesOSN 7500
Technical Manual - System Description 7 Intelligent Features
Huawei Technologies Proprietary
7-4
Ring1
Protection path of the ring
Ring2
Figure 7-2 Protection for gold level service
For silver level service, upon failure the service path is re-calculated after the
convergence of the topology. As the network convergence is time-consuming, the
service damaging or interruption time in re-routing is longer than the switching time for
the above two services.
Compared with the two services described above, the silver service has an advantage
that it does not need bandwidth reservation for recovery, thus improving the bandwidth
utilization. As shown in Figure 7-3, when the service link fails, a new path will be found
to recover the service.
There are two modes for rerouting: revertive and non-revertive. If the service reverts to
the original path when the fault is removed, it is in revertive mode; if not, it is in
non-revertive mode.
Re-calculated path
Figure 7-3 Application of silver level service
Provision of services of multiple-levels inherits the merit of fast protection switching of
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