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自动化专业英语（精选5篇）

第一篇：自动化专业英语自动化090425王晓康17孙挺24杨凌云16张瑞ThesedaysamassiveOnthedeploymentofVoIPinEthernetnetworks:methodologyandcasestudyKhaledSalah,DepartmentofInformationandComputerScience,KingFahdUniversityofPetroleumandMinerals,P.O.Box5066,Dhahran31261,SaudiArabiaReceived25May2004;revised3June2005;accepted3June2005.Availableonline1July2005.1IntroductiondeploymentofVoIPistakingplaceoverdatanetworks.MostofthesenetworksareEthernetbasedandrunningIPprotocol.Manynetworkmanagersarefindingitveryattractiveandcosteffectivetomergeandunifyvoiceanddatanetworksintoone.Itiseasiertorun,manage,andmaintain.However,onehastokeepinmindthatIPnetworksarebest-effortnetworksthatweredesignedfornon-realtimeapplications.Ontheotherhand,VoIPrequirestimelypacketdeliverywithlowlatency,jitter,packetloss,andsufficientbandwidth.Toachievethisgoal,anefficientdeploymentofVoIPmustensurethesereal-timetrafficrequirementscanbeguaranteedoverneworexistingIPnetworks.WhendeployinganewnetworkservicesuchasVoIPoverexistingnetwork,manynetworkarchitects,managers,planners,designers,andengineersarefacedwithcommonstrategic,andsometimeschallenging,questions.WhataretheQoSrequirementsforVoIP?HowwillthenewVoIPloadimpacttheQoSforcurrentlyrunningnetworkservicesandapplications?WillmyexistingnetworksupportVoIPandsatisfythestandardizedQoSrequirements?Ifso,howmanyVoIPcallscanthenetworksupportbeforeupgradingprematurelyanypartoftheexistingnetworkhardware?Thesechallengingquestionshaveledtothedevelopmentofsomecommercialtoolsfortestingtheperformanceofmultimediaapplicationsindatanetworks.AlistoftheavailablecommercialtoolsthatsupportVoIPislistedin[1,2].Forthemostpart,thesetoolsusetwocommonapproachesinassessingthedeploymentofVoIPintotheexistingnetwork.OneapproachisbasedonfirstperformingnetworkmeasurementsandthenpredictingthenetworkreadinessforsupportingVoIP.Thepredictionofthenetworkreadinessisbasedonassessingthehealthofnetworkelements.ThesecondapproachisbasedoninjectingrealVoIPtrafficintoexistingnetworkandmeasuringtheresultingdelay,jitter