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

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8.2. Span Protection

8.2.1. Functional Description

As described in Chapter 4, LAPS supports 1 + 1 and 1:N protection schemes. Under LAPS, 1:N protection requires the configuration of protection groups, that is, groups of N+1 links, where N links are designated as working links and 1 link as the protection link. This is shown in Figure 8-2a, where three protection groups between nodes A and B are shown. The 1:N protection scheme can be generalized into a M:N scheme, where there are N working links and M protection links, M < N. Thus, if a failure affects more than M working links in a protection group, only M of them can be protected even if there are free protection links in other groups. A further generalization of this scheme is to pool all ...

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