Lightpath Restoration in WDM works.ppt


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LightpathRestorationin workMagazineNov/Dec2000WavelengthDivisionMultiplexing(WDM)Why?Tomeetthechallengeposedbytheever-?Dividethevasttransmissionbandwidthavailableonafiberintoseveralnon--to-,buffered,-opticalconversionandbufferingattheintermediatenodes.(wavelengthrouting).municationpathbetweentwonodes,,lightpathsareestablishedbetweenasubsetofnodepairs,-Connects(WXCs)workconsistsofwavelengthcross-connects(WXCs)-connect(WSXC) Wavelengthinterchangingcross-connect(WIXC)works:#ofwavelengthssupportedbyonefiberislimited;butthebandwidthdemandsarestillgrowing. SpaceMultiplexingRestorationWhyitshouldbefault-tolerant?ponents,suchaslinks,nodes…:ShorterrestorationtimeEfficientresourceutilizationProtocoltransparencyAnanalogy:Insteadofreroutingcarsoffthehighwayontosideroads,thewholehighwayisinstantlyrerouted–(workinglightpath,…)Whenaprimarylightpathfails,thetraffi

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