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1、英文文献_科技类的_原文及翻译_(电子_电气_自动化_通信)12420209外文文献原文OnthedeploymentofVoIPinEthernetnetworks:methodologyandcasestudyKhaledSalah,DepartmentofInformationandComputerScience,KingFahdUniversityofPetroleumandMinerals,P.O.Box5066,Dhahran31261,SaudiArabiaReceived25May
2、2004;?revised3June2005;?accepted3June2005Availableonline1July2005AbstractDeployingIPtelephonyorvoiceoverIPVoIPisamajorandchallengingtaskfordatanetworkresearchersanddesigners.Thispaperoutlinesguidelinesandastep-by-stepmethodologyonhowVoIPcanbedeployeds
3、uccessfully.Themethodologycanbeusedtoassessthesupportandreadinessofanexistingnetwork.PriortothepurchaseanddeploymentofVoIPequipment,themethodologypredictsthenumberofVoIPcallsthatcanbesustainedbyanexistingnetworkwhilesatisfyingQoSrequirementsofallnetwo
4、rkservicesandleavingadequatecapacityforfuturegrowth.Asacasestudy,weapplythemethodologystepsonatypicalnetworkofasmallenterprise.Weutilizebothanalysisandsimulationtoinvestigatethroughputanddelaybounds.Ouranalysisisbasedonqueuingtheory,andOPNETisusedfors
5、imulation.Resultsobtainedfromanalysisandsimulationareinlineandgiveaclosematch.Inaddition,thepaperdiscussesmanydesignandengineeringissues.TheseissuesincludecharacteristicsofVoIPtrafficandQoSrequirements,VoIPflowandcalldistribution,definingfuturegrowthc
6、apacity,andmeasurementandimpactofbackgroundtrafficKeywords:NetworkDesign,NetworkManagement,VoIP,PerformanceEvaluation,Analysis,Simulation,OPNET1IntroductionThesedaysamassivedeploymentofVoIPistakingplaceoverdatanetworks.MostofthesenetworksareEthernetba
7、sedandrunningIPprotocol.Manynetworkmanagersarefindingitveryattractiveandcosteffectivetomergeandunifyvoiceanddatanetworksintoone.Itiseasiertorun,manage,andmaintain.However,onehastokeepinmindthatIPnetworksarebest-effortnetworksthatweredesignedfornon-rea
8、ltimeapplications.Ontheotherhand,VoIPrequirestimelypacketdeliverywithlowlatency,jitter,packetloss,andsufficientbandwidth.Toachievethisgoal,anefficientdeploymentofVoIPmustensurethesereal-timetrafficrequirementscanbeguaranteedoverneworexistingIP