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1、英文翻译资料学院（部）：电气与信息工程学院专业班级：学生姓名：2012年6月1日0安徽理工大学毕业设计xDSLAnalogCircuitsandSignalProcessingxDSLreferstodifferentDSL,suchasADSL,HDSLandRADSL.DSLusesordinarytelephonelinestohigh-bandwidthinformationintothehomeandsmallbusinessenterprisetechnologies.Traditionaltelephoneb
2、usinessthroughthetwisted-pairfamiliesorcompaniesconnectedwiththetelephonecompany.Inputdevicessuchasaccesstotelephonevoicesignal(analogsignal),itwillbetransformedintoelectricalsignals.Becausethetelephonecompany'ssignalhasbeensettouseanalogsignaltransmission,soeasil
3、yonthephoneandexchangeofinformationbetweenthephonecompany.Thatiswhytheneedtouseacomputermodemreasons,sothatitwillbethevalueofanalogsignalandconvertedtodigitalsignals.DSLwillnotassumethatdigitalsignalandthenbackintoanalogsignals.Digitalsignaldirectlyintheformofdigi
4、taltransmissiontothecomputer,whichallowsphonecompaniestogreaterbandwidthtotransmitinformation.Atthesametime,partofthesignalisstillanalogsignaltransmissioninordertousethephoneatthesametime.DSLincludingADSL,CDSL,DSLLite,HDSL,IDSL,RADSL,SDSL,UDSL,VDSL,x2/DSL.1.Outlin
5、exDSLisaDSL(DigitalSubscriberLine)ofcollectively,thatis,digitalsubscriberline,basedoncoppertelephonelinesfortransmissionofpoint-to-pointtransmissionmedium.DSLtechnologyinthetraditionaltelephonenetwork(POTS)usersloopssymmetricalsupportandasymmetrictransfermode,ofte
6、nresolvedinthenetworkserviceprovidersandend-usersamongthe"lastmile"oftransmissionbottlenecks.Becauseofthelargenumberofusershasbeenlayingloop,sotomakefulluseofexistingresourcesofcopper,twisted-paircopperthroughthehigh-speedaccesshasbecometheminimumcostofdoingbusine
7、ssdeliveredthemostrealisticsolutionforbroadbandaccessnetworks.DSLtechnologyhasbeenalargenumberofapplications,isaverymaturetechnologyaccess.SystemismainlycomposedofxDSLcentralofficeequipment(DSLAM-DigitalSubscriberLineAccessMultiplexer)andcustomerpremise3安徽理工大学毕业设计
8、equipment(CPE),fromthecentralofficeDSLAMaccessplatform,DSLcentralofficecard,voiceseparator,IPC(dataconvergencedevice)andsoonComposition.Asshown,voicesep
