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1、一、英文原文OpticalfiberaccessnetworktechnologyDuringtheearly1980s,analogcellulartelephonesystemswereexperiencingrapidgrowthinEurope,particularlyinScandinaviaandtheUnitedKingdom,butalsoinFranceandGermany.Eachcountrydevelopeditsownsystem,whichwasincompatible
2、.Theentiretelecommunicationnetworkaccordingtonetworkfunctionisdividedintothreesections:switching,transmission,andaccess.Accesstotelecommunicationsbusinesstransparenttousers,transmitspecific,accesstolocalswitchandtheuserthattheconnectionbetweentheparts
3、,usuallyincludesubscriberlinetransmissionsystem,reuseequipment,crossingconnectiondeviceoruser/networkterminalequipment.Andactuallypickforbusinessentityisbusinessnodes.1.Accessnetworkdevelopmentprocess1.1AccessNetwork（AN:Accessbybusiness）referstoanodei
4、nterface（SNI）andrelatedusersNetworkinterface（UNI）betweenaseriesoftransmitentity（suchaslinefacilitiesandtransmissionfacilities）fortransmissionconsistingoftelecommunicationbusinessprovidetherequiredtransmitloadcapacity,implementationsystemconfigurations
5、percentilemanagementinterfaceviaandmanagement.Accesscanbeseenaswithbusinessandapplicationirrelevanttransmissionnetwork,mainlyfinishcrossingconnection,reuseandtransmissionfunction,itistransparenttousersofsignaling.Basedonmodernoftelecommunicationnetwor
6、kaccessnetworkisintegratedserviceaccess,simplelocalvoiceaccesswillbeincreasinglycannotmeettherequirements,thevoice,dataandimagecomprehensiveaccessisbecomingaccessnetworkdevelopmenttrend.Afteryearsofdevelopment,accessnetworkdefinethoughdoesnotchange,bu
7、titsconnotationandformshaschangedsignificantly.Superiortraditionalaccessnetworkintegratedopticalfiberaccessnetworkwillbeusersaccessthefuturedevelopingtrend.OpticalfiberaccessfromSNItoUNIreferstoallorpartoftheaccessnetworkbyusingopticalfiberasmedium.IT
8、U-Taboutaccessnetworkrecommendationsindicatethatfiber,useraccesssystemiscomposedofthreeparts:opticallineterminal（OLT）,opticaldistributionnetwork（ODN）andopticalnetworkunit（ONU）.1.2Accordingtotherequirementofsystemaccessframeworkandtheimportantc
