With WDM networks, the failure of a single link or component m a y cause the simultaneous failure of several optical channels, potentially making impossible the restoration by rerouting in higher layers directly using the optical network (SDH, ATM, IP). To address this, we i n troduce the concept of Design Protection, which aims at making such failure propagations impossible. We present the Disjoint Alternate Path (DAP) algorithm which places optical channels in order to maximise design protection. We show the result on the example of the ARPA-2 network.

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