1、学号:200712020122毕业设计翻译(汉译英)学生姓名:专业班级:07通信1班学院:信息工程学院指导教师:河北联合大学信息工程学院原文多业务传送平台(MSTP)是对传统的SDH设备进行了改进,在SDH帧格式中提供不同颗粒的多种业务、多种协议的接入、汇聚和传输能力,是目前城域传送网最主要的实现方式之一。基于SDH的MSTP比较适合于已大量敷设SDH网络的电信运营商,可以灵活有效地支持迅速发展的分组数据业务,同时可以保证对多业务的统一网络管理,实现从电路交换网向分组交换网的平滑过渡。在近期中国移动以话音等TDM业务为主、数据业务为辅的情况下,选择以SDH为基础的MSTP建设方案是稳妥且可持续
2、发展的策略。基于SDH的MSTP将是今后几年城域光传送网建设的重点。综合来说,基于SDH的MSTP具有以下技术特点。我们在使用MSTP技术组网应用前,一定要先对它有一个清楚的技术定位,这样才能做到很好地利用它,并在应用中体现出它的优点。MSTP技术是适应城域综合传送网建设要求,从SDH设备发展起来的新兴综合传送技术,其基本特征是通过对以太数据帧和ATM信元的封装,实现基于SDH的多业务综合传送。从本质上讲,MSTP技术定位在城域传送网的范畴之内,主要目的是为了实现多业务的综合传送,其完善的二层交换等数据链路层功能也仅仅是为了提高数据业务的传送效率。但是,随着与其它网络技术的不断融合发展,如RP
3、R、MPLS等技术,MSTP技术的应用领域和组网思路不断地革新,其设备逐渐跨越了原有的城域传送网和业务网之间的界限,反映了业务网与传送网在城域范围内融合的发展趋势,主要表现在以下两个方面:1以MSTP为主体的传送网本身逐步通过网元出租等方式逐步向业务网转变,例如虚拟传送网等等。2MSTP技术表现出逐步替代其它数据业务网络的发展趋势,也就是部分数据链路层功能的替代,如替代ATM网络实现DSLAM的接入;当然也有少数厂商的MSTP传送设备实现了部分第三层功能。但是在实际网络部署中,需要重点考虑如何围绕MSTP技术开展业务,以及考虑利用MSTP技术能够替代哪些现有数据业务网络的功能。MSTP网络的业
4、务类型支持EPL(EthernetPrivateLine,以太网专线)业务、EVPL(EthernetVirtualPrivateLine,以太网虚拟专线)业务、EPLAN(EthernetPrivateLocalAreaNetwork,以太网专用局域网)业务和EVPLAN(EthernetVirtualPrivateLAN,以太网虚拟专用局域网)业务本设计是根据客户的需求,进行规划设计,运用华为光智能光河北联合大学信息工程学院传输设备OptiXOSN3500及OptiXT2000传送网子网级综合网管系统完成EPL、EVPL业务配置,最终设计达到满足客户需求。本设计过程之工程需求:在某城的A、
5、B、C、D四地之间需要组建新的通信网络。1.用户A有两个分部位于NE1和NE3,要进行以太网通信,需要10Mbit/s带宽。2.用户B有两个分部位于NE1和NE3,要进行以太网通信,需要20Mbit/s带宽。3.用户A和用户B的业务需要相互隔离的。4.用户A与用户B的以太网设备提供100Mbit/s以太网接口,工作模式为自协商,均不支持VLAN。5.用户D两个分部分别位于NE1和NE2,需要互相通信。6.用户E两个分部分别位于NE1和NE2,需要互相通信。7.用户D和用户E的业务需要相互隔离,但业务量在时间上有互补性,可共享20Mbit/s带宽。8.用户D和用户E的以太网设备提供100Mbit
6、/s以太网电接口,工作模式为自协商,均不支持VLAN标签。工程规划:由4个OptiXOSN3500网元组成STM-16的二纤双向复用段保护环带STM-4的无保护链。NE1、NE2、NE3、NE4为环上的4个网元,其中NE1为网关网元。使用以太网透传单板或以太网交换单板都可以实现A、B、C、D间EPL业务。在T2000上设置网元的以太网接入功能。本设计使用以太网交换单板实现A、B、C、D间EPL业务配置。使用共享VCTRUNK的EVPL(VLAN)实现A、B、C、D间的EVPL业务。MSTP不是一个成型的封闭标准体系,它是依托于SDH平台的技术及应用,具体采用什么技术取决于运营商建网的思路以及为
7、最终用户提供何种类型的业务。MSTP体系中有大量的数据标准的引用,比如以太网标准,在此层面上的建议和协议层出不穷。究竟将如何将何种技术纳入MSTP平台,必然需要不断的摸索和尝试。MSTP技术的出现和应用代表了一种新的网络变革,不仅是技术上的,也是管理上的,更是观念上的。它为城域网中的综合业务提供了解决方案,是现有数据网络的补充,为传统SDH注入了新的活力。MSTP这一多业务传送平台正得到愈来愈多通信运营商的青睐,其传输层功河北联合大学信息工程学院能正从传输语音向传输宽带数据转换,并且由于采用了新一代的SDH技术(GFP、VCAT、LCAS)、集合数据二层交换和ATM交换提供高效、灵活的和可靠的
8、数据传输。MSTP对城域网进行整合,将分离的、重叠的网络整合成一个多业务、灵活的、易管理的低成本网络。随着RPR、MPLS等新技术的成型,以及相关新技术的开发。MSTP在城域网的构建中会越来越重要。城域网的最大特点是多样性,每种技术都有其应用空间,我们不能简单地以一种方式来决定各个地区城域网的发展,应根据城市规模、业务类型、用户分布等选取合理的技术,并充分考虑如何兼顾更好利用已有网络资源和向未来演进之间的关系,为运营商创造最大的投资回报。相信随着技术和标准的逐步完善和发展,MSTP技术和设备会迎来更加美好的明天。译文Multi-ServiceTransportPlatform(MSTP)has
9、improvedthetraditionalSDHequipment,AndformattedinavarietyofservicesintheSDHframeprovidedbydifferentparticles,multi-protocolaccess,aggregationandtransmissioncapacity,Itisoneofthemostimportantmetrotransportnetworkway.TheMSTPbasedonSDHhasalotmorelaidforSDHnetworkcarrierstheflexibilitytoeffectivelysuppo
10、rttherapiddevelopmentofpacketdataservices,whileensuringaunifiedmulti-servicenetworkmanagement,fromacircuit-switchednetworkstopacketswitchednetworkssmoothtransition.ChinaMobileinthenearfuturetovoiceandotherTDM-basedservices,dataservices,supplementedbythecase,selecttheSDH-basedMSTP-buildingprogramisas
11、oundandsustainabledevelopmentstrategies.SDH-basedMSTPwillbethenextfewyears,theconstructionofmetroopticaltransportnetworkkey.Insummary,theSDH-basedMSTPhasthefollowingtechnicalcharacteristics.1.Ithaslargecross-connectcapacitytosupportVC-4/VC-3/VC-12variouslevelsofcross-connectandcontinuouscascadeorvir
12、tualconcatenationprocessing.2.ItProvidearichmulti-service(PDH/SDH,ATM,Ethernet/IP,imageservices,etc.)interface,youcanaddorreplacetheinterfacemodule,flexibletoadapttochangesinbusinessdevelopment.3.EthernetandATMserviceswithtransparenttransmissionorflooroftheexchangecapacityofthetransmissionlinkbandwi
13、dthcanbeconfigured,andsupportVLAN,flowcontrol,operationsandportaggregationorstatisticalmultiplexing河北联合大学信息工程学院function.4.Completewithavarietyofprotectionmechanisms(SDH,ATM,Ethernet/IP)networkingfeaturesandflexible.5.Itcanachieveaunified,intelligentnetworkmanagement,hasgoodcompatibilityandinteropera
14、bility.BeforeweusetheMSTPtechnologynetworkingapplications,itmustfirsthaveacleartechnicalposition,soastoachievegooduseofitandreflectitintheapplicationofbenefits.MSTPtechnologyisintegratedmetrotransportnetworktoadapttorequirementsofthebuilding,fromtheSDHequipmentdevelopednewintegratedtransmissiontechn
15、ology,itsbasicfeaturesaredataframesbyEthernetandATMcellencapsulation,SDH-basedmulti-serviceintegrateddelivery.Inessence,MSTPtechnologytolocateinmetroareaswithinthetransportnetwork,themainpurposeistoachieveacomprehensivemulti-servicedelivery,itsperfectLayer2switchingfeaturessuchasdatalinklayeronlytoi
16、mprovethedeliveryofdataservicesefficiency.However,aswithothernetworktechnologyconvergence,suchasRPR,MPLSandothertechnologies,MSTPtechnologyapplicationsandnetworkingideasinnovationconstantly,graduallytheirequipmentacrossthemetrotransportnetworkandexistingbusinessnetworksbetweenboundaries,reflectingth
17、ebusinessnetworkandtransmissionnetworkinthemetropolitanareaintegrationtrends,mainlyinthefollowingtwoaspects:1.TheMSTPasthemainstayofthetransportnetworkitselfgraduallythroughtheleasedline,etc.andgraduallyshifttotheservicenetwork,suchasvirtualtransmissionnetworkandsoon.2.MSTPtechnologytoshowthegradual
18、replacementofotherdataservicesnetworkdevelopmenttrend,whichispartofthedatalinklayerfunctionsinsteadasanalternativetoachievetheDSLAM,ATMnetworkaccess;course,therearefewmanufacturersofMSTPtransmissionequipmenttoachievesomeLayer3functionality.Butintheactualnetworkdeployment,itisimportanttoconsiderhowto
19、conductbusinessaroundtheMSTPtechnology,andconsidertheuseofMSTPtechnologywhichcanreplacetheexistingdataservicenetworks.ThetypesofMSTPnetworkbusiness:SupportEPL(EthernetPrivateLine,EthernetPrivateLine)service,EVPL(EthernetVirtualPrivateLine,EthernetVirtualPrivateLine)services,EPLAN(EthernetPrivateLoca
20、lAreaNetwork,EthernetPrivateLAN)serviceandEVPLAN(EthernetVirtualPrivateLAN,Ethernetvirtual河北联合大学信息工程学院PrivateLAN)service。ThekeytechnologiesMSTP:MSTPofGFP,MSTPofvirtualconcatenation,MSTPofLCAS,MSTPoftheRPRandMPLS.ThedesignfirstEPL,EVPL,EPLAN,EVPLANcomparisonserviceandbusinessneedsaccordingtotheuser,u
21、singHuaweisopticalnetworkequipment,HuaweisopticalnetworkOptiXOSNandthesub-networkmanagementsystem,thecustomerneedsT2000EPL,EVPLservicedesign.Designrequirementsincludeapplicationengineering,projectplanning,systemconfiguration.Demonstratethesignificanceoftheengineeringdesignservicesforthebandwidthrequ
22、irementsofcurrentdataisaneffectivesolution.InacityofA,B,C,Disneededbetweenfourtoformanewcommunicationsnetwork.1userAhastwobrancheslocatedinNE1andNE3,tomakeEthernetcommunication,theneed10Mbit/sbandwidth.2UserBhastwodivisionslocatedinNE1andNE3,toconductanEthernetcommunicationneeds20Mbit/sbandwidth.3Us
23、erAandUserB,isolatedfromeachothersbusinessneeds.4UserAandUserBsEthernetdevices100Mbit/sEthernetinterface,auto-negotiationmode,donotsupportVLAN.5UserDandtwodivisionsarelocatedinNE1NE2,needtocommunicatewitheachother.6userEandtwodivisionsarelocatedinNE1NE2,needtocommunicatewitheachother.7.UserDUserEbus
24、inessneedsandisolatedfromeachother,butintimethevolumeofbusinessarecomplementary,shared20Mbit/sbandwidth.8usersDandE,Ethernetequipmentusers100Mbit/selectricalEthernetinterfaces,auto-negotiationmode,donotsupportVLANtags.ProjectplanningOptiXOSN3500bythefourSTM-16networkelementcompositionofthetwo-fiberb
25、idirectionalmultiplexsectionprotectionringwithSTM-4unprotectedchain.NE1,NE2,NE3,NE4ofthefourringnetworkelement,whichisthegatewaynetworkelementNE1.UsingtheEthernetorEthernetswitchboardthroughboardflyerscanachieveA,B,C,DbetweentheEPLbusiness.SetontheT2000Ethernetaccessnetworkelementfunctions.Thisdesig
26、nusesEthernetswitchingSBCA,B,C,DbetweentheEPLserviceconfiguration.河北联合大学信息工程学院SharedVCTRUNKtheEVPL(VLAN)toachieveA,B,C,DbetweentheEVPLMSTPisnotastandardsystemforclosedmolding,itisrelyingonSDHtechnologyandapplicationplatform,specificallytheuseofanytechnologydependsontheideaofbuildinganetworkoperatora
27、swellasend-userwhattypeofbusiness.TheMSTPsysteminalargenumberofstandardreferencedata,suchastheEthernetstandard,atthislevelafteranotherontherecommendationsandagreements.HowexactlywhattechnologywillbeincorporatedintoMSTPplatform,theinevitableneedtoconstantlyexploreandtry.MSTPtechnologyandtheemergencea
28、ndapplicationofnewnetworkrepresentsachangenotonlythetechnicalbutalsomanagement,itisconceptual.MANItprovidescomprehensivebusinesssolutionsthatcomplementexistingdatanetworks,thetraditionalSDHhasinjectednewvitality.Multi-ServiceTransportPlatformMSTPisthatmoreandmoretelecomoperatorstogetthefavoroftheirt
29、ransportlayerfunctionsaretransferredfromvoicetobroadbanddataconversion,andthankstoanewgenerationofSDHtechnology(GFP,VCAT,LCAS),collectionofdataexchangeandATMswitchinglayertoprovideefficient,flexibleandreliabledatatransmission.MSTPintegrationofMAN,willseparate,overlappingintoamulti-servicenetworkintegration,flexible,easytomanagelow-costnetwork.WithRPR,MPLSandothernewtechnology,shape,andtheassociateddevelopmentofnewtechnologies.MSTPinthemetropolitanareawillbecomeincreasinglyimportantinthebuilding.MANsbiggestfeatureisthediversityofeachtechnologyhasitsownapp
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