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1、EthernetPON(ePON):DesignandAnalysisofanOpticalAccessNetwork.GlenKramerDepartmentofComputerScienceUniversityofCalifornia,Davis,CA95616,USATel:1.530.297.5217;Fax:1.530.297.5301E-mail:kramer@cs.ucdavis.eduBiswanathMukherjeeDepartmentofComputerScienceUniversityofCalifornia,Davis,CA95616,USATel:1.530
2、.752.5129;Fax:1.530.752.4767E-mail:mukherjee@cs.ucdavis.eduGerryPesaventoAdvancedTechnologyLab.Alloptic,Inc.Livermore,CA94550,USATel:1.925.245.7600;Fax:1.925.245.7601E-mail:gerry.pesavento@alloptic.comAugust,2000AbstractWiththeexpansionofservicesofferedovertheInternet,the“lastmile”bottleneckprob
3、lemscontinuetoexacerbate.APassiveOpticalNetwork(PON)isatechnologyviewedbymanyasanattractivesolutiontothisproblem.Inthisstudy,weproposethedesignandanalysisofaPONarchitecturewhichhasanexcellentperformance-to-costratio.Thisarchitectureusesthetime-divisionmultiplexing(TDM)approachtodeliverdataencaps
4、ulatedinEthernetpacketsfromacollectionofOpticalNetwork1Units(ONUs)toacentralOpticalLineTerminal(OLT)overthePONaccessnetwork.TheOLT,inturn,isconnectedtotherestoftheInternet.Asimulationmodelisusedtoanalyzethesystem’sperformancesuchasboundsonpacketsdelayandqueueoccupancy.Then,wediscussthepossibilit
5、yofimprovingthebandwidthutilizationbymeansoftimeslotsizeadjustment,andbypacketscheduling.Keywords:accessnetwork,localloop,passiveopticalnetwork,PON,time-divisionmultipleaccess,TDMA,self-similartraffic1.IntroductionPassiveOpticalNetworks(PON)arepoint-to-multipointopticalnetworkswithnoactiveelemen
6、tsinthesignals’pathfromsourcetodestination.Theonlyinteriorelementsusedinsuchnetworksarepassivecombiners,couplers,andsplitters.PONtechnologyisgettingmoreandmoreattentionbythetelecommunicationindustryasthe“lastmile”solution[1,2].AdvantagesofusingaPONforlocalaccessnetworksarenumerous:·APONallowsfor
7、longerdistancesbetweencentralofficesandcustomerpremises.WhilewiththeDigitalSubscriberLine(DSL)themaximumdistancebetweenthecentralofficeandthecustomerisonly18000feet(approximately5.5km),aPONlocalloopcanoperateatdistancesofove
