光纤接入网技术外文翻译文献.docx

光纤接入网技术外文翻译文献.docx

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光纤接入网技术外文翻译文献

光纤接入网技术外文翻译文献

（文档含中英文对照即英文原文和中文翻译）

原文：

Opticalfiberaccessnetworktechnology

Theentiretelecommunicationnetworkaccordingtonetworkfunctionisdividedintothreesections:

switching,transmission,andaccess.Accesstotelecommunicationsbusinesstransparenttousers,transmitspecific,accesstolocalswitchandtheuserthattheconnectionbetweentheparts,usuallyincludesubscriberlinetransmissionsystem,reuseequipment,crossingconnectiondeviceoruser/networkterminalequipment.Andactuallypickforbusinessentityisbusinessnodes.

1.Accessnetworkdevelopmentprocess

1.1AccessNetwork（AN:

Accessbybusiness）referstoanodeinterface（SNI）andrelatedusersNetworkinterface（UNI）betweenaseriesoftransmitentity（suchaslinefacilitiesandtransmissionfacilities）fortransmissionconsistingoftelecommunicationbusinessprovidetherequiredtransmitloadcapacity,implementationsystemconfigurationspercentilemanagementinterfaceviaandmanagement.Accesscanbeseenaswithbusinessandapplicationirrelevanttransmissionnetwork,mainlyfinishcrossingconnection,reuseandtransmissionfunction,itistransparenttousersofsignaling.

Basedonmodernoftelecommunicationnetworkaccessnetworkisintegratedserviceaccess,simplelocalvoiceaccesswillbeincreasinglycannotmeettherequirements,thevoice,dataandimagecomprehensiveaccessisbecomingaccessnetworkdevelopmenttrend.Afteryearsofdevelopment,accessnetworkdefinethoughdoesnotchange,butitsconnotationandformshaschangedsignificantly.Superiortraditionalaccessnetworkintegratedopticalfiberaccessnetworkwillbeusersaccessthefuturedevelopingtrend.

OpticalfiberaccessfromSNItoUNIreferstoallorpartoftheaccessnetworkbyusingopticalfiberasmedium.ITU-Taboutaccessnetworkrecommendationsindicatethatfiber,useraccesssystemiscomposedofthreeparts:

opticallineterminal（OLT）,opticaldistributionnetwork（ODN）andopticalnetworkunit（ONU）.

1.2Accordingtotherequirementofsystemaccessframeworkandtheimportantcharacteristics,accessnetworkcanbesummarizedasthefollowing:

1.2.1Accesstoaccessbusinessprovidesbearingcapacity,achievebusinesstransparenttransfer.

1.2.2.Theaccessistransparenttouserssignaling,exceptforsomeuserssignalingformatconversionoutside,signalingandbusinessprocessingfunctionisstillinbusinessnode.

1.2.3Theintroductionofshouldnotberestrictedaccessallkindsofexistingaccesstypesandbusiness,accessnetworkshouldthroughthelimitedstandardizationinterfaceandbusinessnodeconnected.

1.2.4Accessnetworkhaveindependentfromthebusinessnodeinthenetworkmanagementsystem,thissystemthroughthestandardizedinterfacesconnectedTMN,accessnetworkoperationforimplementationTMN,maintenanceandmanagement.

2.fiberstructure

2.1generallinearstructure.Refertothepublicbus,fiberaseachuserterminalsthroughdirectconnectwithbuscouplernetworkstructure.Itscharacteristicissharingbackbonefiber,savelinestoremovenodeinvestment,thedemandishigher,dynamicrange,interferewitheachothereffectissmall.Defectislossofaccumulation,thebackbonefiberuseracceptancedependenceisstrong.

2.2ringstructure.Referstoallshareafiberopticlinknode,fiberopticlinkitsendtoendtheclosedloopnetworkstructure.Characteristicisself-healing,namelycanberealizedwithoutintervention,thenetworkcanbeinarelativelyshortperiodoftimetorecoverfromfailurehavepreachedbusiness,highreliability.Defectishangedbythenumberofusersofmonocyliclimited,polycyclicinterchangeisrelativelycomplex,notsuitableforCATV,etcFenPeiXingbusiness.

2.3starstructure.Thisstructureisactuallypoint-to-pointway,eachuserterminalsinthecentralnodethroughwithcontrolandswitchfunctionsoftheastralcouplersexchangeinformation.Characteristicsofsimplestructure,maintenanceisconvenientandeasytoupgradeandexpansionbetween,eachuserrelativelyindependent,goodsecrecy,businessadaptability.Defectishigher,networkingrequiredfibercostofpoorflexibility,highreliabilityrequirementsofcentralnode.

2.4treestructure.Similartothebranches,ahierarchicalstructure,shapeintransferboxesandFenXianHeplaceadoptsmultipleopticaldistributor,willsignalfilteringdowntopendinningsallocation,havestrongcontrolcoordination.Characteristicissuitableforbroadcastingbusiness.Defectispowerlossisbigger,two-waycommunicationdifficultybigger.

3．Thestatusofopticalaccessnetworkinthemoderncommunication

Opticalfiberinrealizingnationalinformationmodernizationaccessplaysamoreandmoreimportantrole,isanindispensablepartofmoderncommunicationsnetwork.Moderncommunicationsnetworkbasicrealizedbasedonfiberbackbonetransmissionandexchange,andaccesssectionisstillrestrictedmoderntelecommunicationsfurtherdevelopmentandimprovementofthe"bottleneck",therefore,toconstructionofnationalinformationinfrastructure（NII）,accessnetworkisthekey.Accessnetworktechnologydevelopment,willresultingreatchangesoftelecommunicationsandinformationnetwork,namely,voice,data,video,etc.Variouskindsofinformationtransmission,comprehensivebusinesstogetherforimplementingtheresourcessharing,andgraduallyoptimizedcommunicationnetwork,greatlyimprovingnetworkbenefits.

Twoopticalfiberopticaltransmissiontechnologyaccesswiththecombinationoftheaccesstechnology

3.1Lighttransmissiontechnologydevelopmentandevolution

Since1979,thehumanuseofopticalfiberascommunicationmode,opticaltransmissiontechnologyexperiencesincefromanalogtodigital,fromPDHtosdh-basedWDM,frompassiveandactivetoaseriesofMSTPfromSDHtothedevelopmentandevolutionprocess,transmissioncapacityandreliability,thetransmissiondistancesuchindicatorshavereachedaveryhighlevel.

ThecurrentmainstreamofopticaltransmissiontechnologyisstillSDH,STM-1/4/16/64/256seriessynchronoustransfermodulehasbeenachieved,includingSTM-256framerateashighas40Gbps.BasedonSDH,fusionbroadbanddatabusinessmulti-tasktransmittingplatform（theMSTP）hasalsobecomethebestchoicefortoday'sconstructionintracitynetworks,moreoverelasticgroupingring（RPR）technologyisalsograduallybecomethedirectionofthedevelopmentofalighttransmission.Thefuturewillbeopticaltransmissionnetworktoopticaltransmissionnetwork（otns）inthedirectionofdevelopment,manyexchange,networkotnschooseroadandotherintelligentfunctionwillbeimplementedonlightlayer.OtnstheintelligentnetworkdevelopmentdegreecanrealizeASONintelligentopticalnetwork.

3.2Lighttransmissiontechnologyandaccesstechnologyconstitutefiberaccessnetwork

Theneedsoftheuser,thediversificationandbroadbandaccesstechnologyfrominitialmadeofpurenarrowbandaccesstobroadbandaccess,size,andwithintegratedaccesstotransmissionplatformrequirementlightmoreandmoreisalsohigh.

Opticaltransmissiontechnologyandaccesstechnologytogetherconstitutefiberaccessnetworksystem.Opticalfiberaccessnetworkindifferentstagesofdevelopmentofneedtoresorttothecorrespondingopticaltransmissionmeanstoachievetheoperationalloadandtransfer.Withthelightnetworkwillbedispersedaccessdevices（OLTONU）togetherwithorganicwhole,formaunifiedfiberaccessnetworksystem.

4.Thecurrentdevelopmentoffiber-opticaccesshotspot

Currently,fiber-opticaccessnetworkcontinuepresentedthevigorousdevelopmentmomentumandvariousnewaccesstechnologyarisesatthehistoricmoment.ThedevelopmentofbetterhavexDSL,FTTX,dualbussizetakecomprehensiveaccesstechnologies.Inaddition,HFCAPONEPON,suchtechnologyisalsoinconstantdevelopingandperfecting.

4.1ThedevelopmentandapplicationofXDSL

XDSLtechnologyreferstotheADSL（asymmetricdigitalsubscriberloop）asarepresentativeofdigitalsubscriberloop（DSL）thefloorboardofaseriesoftechnology.

Byusingofgroundwirealthoughmorethan2Mbpsbroadbanddatatransmission,butthetransmissiondistanceisverylimited.XDSLandopticalfiberintegratedaccessnetworkstructure,withtheUNIboundeduser-orientedprovidenarrowbandnormaltelephone,2Mbpsline,10Base_TandATMbroadbandinterface.Usingfibresolveaccessnetworktransmissionoffeedersection,XDSLsolvefinallyhundredsmetersto3.5kilometers（inthisrange,canguaranteeahighrate）,itisquitebroadbandaccessbroadbandtechnologyeffectively.ThecurrentmarketmostsuccessfulisADSLtechnologies,includingChinatelecom,Chinanetcom,Chinaunicom,Chinatietong,eachbigtelecomoperatorsarespendingheavilyconstructionADSLnetwork.Intheuserisrelativelyscattered,twisted-paircableresourcesundertheconditionofcomparativeenergetic,ADSLcanlowcosttosolveusersnetworkbandwidthneeds.SHDSL,HDSLcanprovideuserswithbroadbanddataline,thesetwokindsofdigitalsubscriberloopinspecialcircumstances,thetechnicalsolutiontotheproblemofprovidingdataline.

VDSLtechnologyiswithADSL）thedevelopmentandpopularizationofandgraduallymovingtowardsthecommercial,butbecauseitcansupportdistanceisshort,atpresentitspopularitystillfarlessADSL.

4.2FTTXtechnology

Inallsortsofbroadbandaccessnetworktechnology,opticalSDHtechnologyadoptedtheaccessnetworksystemisappliedthemostcommon.SDHtechnologyapplicationinaccessnetworkhasalreadywidespread,butstilljustFTTC（opticalfibertothesideoftheroad）,FTTB（fibertothefloor）,thehugebandwidthopticalfiberlevelstilln