计算机专业毕业设计英文翻译网络方向.docx

计算机专业毕业设计英文翻译网络方向.docx

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计算机专业毕业设计英文翻译网络方向

Widebandopticalfiberaccessnetworktrendofdevelopment

Author:

LiuJinhaiarticlesource:

Computeruniversaltime:

2005-3-8

文中字体改一致

Thisarticlefirstisbriefintroducedtheworldbroadbandaccessnetworkdevelopstheconditionandthemainapplication,nextnarratedthewidebandopticalfiberaccessnetworkmerit.Withemphasishasoncemoreanalyzedthewidebandpoint-to-pointactiveEthernetopticalfibersystemandthewidebandtothepassiveopticalfibersystemcharacteristicandtheapplication.Meetsdownproposedourcountryopticalfiberaccessnetworksendschem.possibletosurmountAPON,BPONandtheEPONstage,startsfromthewidebandpoint-to-pointEthernetopticalfibersystemandGEPON,finallyandeventransitstotheGPONstagepreliminaryidea.Finallyanalyzedtheopticalfibercommunicationstechnologytrendofdevelopmentfromeachangle.

Thebroadbandaccessnetworkdevelopsconditionandmainapplication

Infact,lookingfromthetelecommunicationdevelopmenthistory,whenthenetworknumberofusersachievescertainscale.Eachkindofapplicationmeetsthenatureproduction;thisalsoisso-calledstepstheCufflawmighttobeatespecially.Inthehistoryonekindoftechnologysincebirthhasnotbeenhavingabigpileofapplication,regardlessofisthemobilecommunicationortheInternet,onitsshortnote,thebrowsing,thenetchatsandsoonthekeyapplicationsallisdevelopscertaindegreeaftertheuserscaletoproducenaturally,butisnotsedulouslydesignsbeforehandplans.

Sincehasenteredforthe21stcentury,thewholeworldbroadbandaccessnetworkenteredthebigdevelopmentphase.To2004year'send,thetotalnumberofusersalreadyachieved150,000,000,becameintheelectricityreliablehistoricalaccounttodeveloponeofquickesttelecommunicationservices,andevenwasalsoquickerthanthemobileservice.Forexamplethewholeworldmobileservicefrom10,000,000developedto100,000,000hasspentfor5.5years,butthebroadbandaccessservicehasonlyusedfor3.5years.AccordingtotheIDCforecast,in2007theglobalwidebandtotalusermayachieve209,000,000,inwhich9.9,namelyabout20,000,000usersforopticalfiberaccessnetwork.

TheAsianandPacificarea,speciallySouthKorea'sandJapanwerethebroadbandaccessdeveloptheswiftestmostandviolentcountry,theSouthKoreanwidebandusertotalalreadybreakthrough10,000,000,thewidebandpopularrateoccupiedtheworldfirst,holdfamily7Internet90%.JapaneseGovernmentalsovigorouslyadvancesthewidebanddevelopmentthrougheachmeasure,plansin2005toenhancethewidebandusertotalto30,000,000,inwhichFTTHachieves110,000.USstillistheworldbiggestbroadbandaccessmarket,thetotalnumberofuserssurpasses30,000,000.AmericanFOCthewidebandservicelocalizationisoneof2003-2008yearsixbiggoals,infactthebroadbandaccessisbecomingtheAmericanuniversalservicethenextgoal.TheUSbroadbandaccessisprimarilydevelopsbythecabletelevisionandADSL,becausethetelecommunicationcontrolpolicyencouragementusesthenewtechnicalconstructionnetwork（e.g.FCCstipulationoperationbusinessconstructionopticalfiberaccessnetworktobepossiblenotlimitedthepressurewhichinlocalringcircuitnon-colligationpolicy）aswellasthecompetitionandtheservicegrows,recentlyleadstheoperationbusinesstobeextremelypositivetotheopticalfibertothestation（FTTP）development.

Speakingoftheopticalfiberaccessnetwork,speciallytheopticalfibertostation（FTTP）oropticalfiberproficient（FTTH）,thewholeworldalreadystartedtoentertheunloadingphase,onlyUShad270FTTPprojects,wasmostlythelocalauthority,thepubliccompany,thepropertydeveloperandthenon-leadingtelecommunicationoperationbusinessproject.Leadingoperationbusinessalsostartstoenterthisdomain,inwhichVersionplansin2005tocomplete3,000,000FTTP;SBCintheplanplansin2007initshuge“speedoflight”toreach18,000,000FTTN,eachhouseholdhasspeed20-39Mb/s,providestheend-to-endtertiaryservicecolligation（triteplay）theservice.JapanisintheworldadvancestheFTTHmostradicalcountry,2.004yearsitsopticalfiberonalreadyunderstoodmorethan18,000,000householdsfamilies,buttheuserdevelopmentlag,probablywas2,000,000,in2005plansdevelops10,000,000.Europequiteissteadyconservatively,FTTHaltogetherhaslaidto2004500,000,some167smallprojectsortheexperimentalprojectarecarryingon.

Ourcountrybroadbandaccessnetworkextremelyisalsorapidintheneartwoyeardevelopment,accordingtothepreliminarystatistics,to2004year'sendourcountrywidebanduseris25,000,000,becomesisinferiortoUS'ssecondbigbroadbandaccessmarket,inwhichleadershiptechnologyisonlyADSL,probablyaccountsforabout70%,nextistheEthernet