光纤接入网技术英文文献翻译.docx
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光纤接入网技术英文文献翻译.docx
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光纤接入网技术英文文献翻译
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),thehugebandwidthopticalfiberlevelstillnotohousehold.Therefore,toreallyprovideb
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