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1、一、英文原文OpticalfiberaccessnetworktechnologyDuringtheearly1980s,analogcellulartelephonesystemswereexperiencingrapidgrowthinEurope,particularlyinScandinaviaandtheUnitedKingdom,butalsoinFranceandGermany.Eachcountrydevelopeditsownsystem,whichwasincompatible.Theentiretelecommunicationnetworkaccordingt
2、onetworkfunctionisdividedintothreesections:switching,transmission,andaccess.Accesstotelecommunicationsbusinesstransparenttousers,transmitspecific,accesstolocalswitchandtheuserthattheconnectionbetweentheparts,usuallyincludesubscriberlinetransmissionsystem,reuseequipment,crossingconnectiondeviceo
3、ruser/networkterminalequipment.Andactuallypickforbusinessentityisbusinessnodes.1.Accessnetworkdevelopmentprocess1.1AccessNetwork（AN:Accessbybusiness）referstoanodeinterface（SNI）andrelatedusersNetworkinterface（UNI）betweenaseriesoftransmitentity（suchaslinefacilitiesandtransmissionfacilities）fortra
4、nsmissionconsistingoftelecommunicationbusinessprovidetherequiredtransmitloadcapacity,implementationsystemconfigurationspercentilemanagementinterfaceviaandmanagement.Accesscanbeseenaswithbusinessandapplicationirrelevanttransmissionnetwork,mainlyfinishcrossingconnection,reuseandtransmissionfuncti
5、on,itistransparenttousersofsignaling.Basedonmodernoftelecommunicationnetworkaccessnetworkisintegratedserviceaccess,simplelocalvoiceaccesswillbeincreasinglycannotmeettherequirements,thevoice,dataandimagecomprehensiveaccessisbecomingaccessnetworkdevelopmenttrend.Afteryearsofdevelopment,accessnetw
6、orkdefinethoughdoesnotchange,butitsconnotationandformshaschangedsignificantly.Superiortraditionalaccessnetworkintegratedopticalfiberaccessnetworkwillbeusersaccessthefuturedevelopingtrend.OpticalfiberaccessfromSNItoUNIreferstoallorpartoftheaccessnetworkbyusingopticalfiberasmedium.ITU-Taboutacces
7、snetworkrecommendationsindicatethatfiber,useraccesssystemiscomposedofthreeparts:opticallineterminal（OLT）,opticaldistributionnetwork（ODN）andopticalnetworkunit（ONU）.1.2Accordingtotherequirementofsystemaccessframeworkandtheimportantc
