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1、HOWTOOPERATETRANSPORTINGTHEBROADBANDSURGETheexplosivegrowthofIPandvideoservices,liketheP2PandIPTV,arecausingadramaticspikeindemandforhighbandwidthinmetrotransportnetworks.OVUMRHKforecastedaCAGRof18%and33%respectivelyfortheDSLmarketandFTTxmarketintheupcomingfiveyears;whiletrafficinth
2、emetrotransportnetworkswouldincreaseby30times.Operatorsnowhavebothachallengeandagreatopportunity.Makingtherightchoiceiscrucialtosuccessinmaintainingcustomersatisfaction.MetrotransportforbroadbandwaveSuddenly,transportofmassIPserviceshasbecomeapriorityandposesanunprecedentedchallenge
3、toexistingnetworks.Atraditionalmetrotransportnetwork(alsocalledanarrowbandtransportnetwork)isaringnetworkbasedonthesynchronousdigitalhierarchy(SDH),bearingvoiceservicesandsmall-granularityprivatelineservices.Withthedevelopmentofhighbandwidthservices,thetraditionaltransportnetworkism
4、ovingtowardsabroadbandtransportnetworkthatcanbearIPTVandvariouslarge-granularityprivatelineservices.WDM:anessentialchoiceInSouthKorea,thebroadbandpenetrationrateis93%withanaveragespeedof49.5Mbps.Japanhas55%with63.6MbpsandtheUSAclocksinwitha57%rateandaspeedof4.9Mbps.TheInformationTec
5、hnologyandInnovationFoundation(ITIF)publishedareportinMay2008thatshowedabriskworldwidebroadbandmarketfueledbytherapidgrowthofvideoservicesrequiringhigherbandwidth.Familybroadbandaccessisgraduatingfrom2Mto30Moreven100M,andevolvingintoultrabroadband.Supposethereare500,000familybroadba
6、ndsubscribersinametropolitanareanetwork(MAN),andtheaccessbandwidthforeachfamilyis30M,equaling40×10Gwavelengthsconvergedatthenetworkcore.Iftheaccessbandwidthforeachfamilyis100M,thenmorethan120×10GwavelengthsconvergeatthecoreoftheMAN.Toalleviatepotentialbottlenecks,awavelengthdivision
7、multiplexing(WDM)technologyisappliedtomakefulluseofthetremendousbandwidthresourcesoffiberlines.InanMANthatadoptsWDMtechnology,signalswithdifferentcharacteristicsaretransmittedtransparently,andtheMANcaneasilybearservicesignalsofvariousformats,plussaveexpansioncosts.ThishadmadeWDManin
8、dispensabletechnolo
