Opticalfiberaccessnetworktechnology光纤接入网技术大学毕业论文外文文献翻译及原文Word文件下载.docx
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外文文献翻译
文献、资料中文题目:
光纤接入网技术
文献、资料英文题目:
Opticalfiberaccessnetworktechnology
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翻译日期:
2017.02.14
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
Opticalfiberinrealizingn