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Dual-failure scenarios are a real possibility in today's optical networks and it is becoming more and more important foe carriers and network operators to consider them when designing their networks. The p-Cycle is a recent approach in optical network protection. The p-Cycle use preconnected cycles of spare capacity to restore affected working traffic. The authors propose new method and strategies to support multiple qualities of service classes in a static p-cycle based network Design, using the same global set of resources as required to operate a network with only a single failure protected service class. A propose new method to provide dual failures survivability using p-cycle.
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