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Optical Network Control: Architecture, Protocols, and Standards by Debanjan Saha, Bala Rajagopalan, Greg Bernstein

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4.5. Summary

Table 4-13 summarizes the survivability options discussed in this chapter. It can be seen from this table that network survivability techniques involve a multidimensional trade-off between restoration time, bandwidth efficiency, and failure robustness.

Table 4-13. Properties of Protection/Restoration Methods
NameRestoration TimeBandwidth RequiredFailure Robustness
1+1 Linear (SDH/SONET)Typically under 50 ms2xOnly as good as the diversity of the alternative paths. Handles single failure.
1:N Linear (SDH/SONET)Typically under 50 ms Only as good as the diversity of the paths, Handles single failure.
Bi-directional Line Switched Ring (BLSR) Failures.Typically under 100 ms2xDiversity built in, one line out, except in 4F case which can handle ...

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