现代通信和网络技术及产品词汇(英文)

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1、现代通信和网络技术及产品词汇(英文)词汇表术语定义AccessLineThephysicaltelecommunicationscircuitconnectinganenduserlocationwiththeservingcentralofficeinalocalnetworkenvironment.Alsocalledthelocalloopor"lastmile."SeealsoLocalLoop.AccessNetworkThatportionofapublic-switchednetworkthatconnectsaccess

2、nodestoindividualsubscribers.TheaccessnetworktodayispredominantlypassivetwistedpaircopperwiringAccessNodesPointsontheedgeoftheaccessnetworkthatconcentrateindividualaccesslinesintoasmallernumberoffeederlines.Accessnodesmayalsoperformvariousformsofprotocolconversion.Typica

3、laccessnodesareDLCsystemsconcentratingindividualvoicelinestoT-1lines,cellularantennasites,PBXs,andONUs.AccessRateThetransmissionspeedofthephysicalaccesscircuitbetweentheenduserlocationandthelocalnetwork.Thisisgenerallymeasuredinbitspersecond;alsocalledAccessSpeed.Adapter

4、SeeAdapterCard.AdapterCardCircuitboardorotherhardwarethatprovidesthephysicalinterfacetoacommunicationsnetwork;anelectronicsboardinstalledinacomputerwhichprovidesnetworkcommunicationcapabilitiestoandfromthatcomputer;acardthatconnectstheDTEtothenetwork.AlsocalledaNetworkIn

5、terfaceCard.SeealsoDataTerminationEquipmentandNetworkInterfaceCard.ADSLForumTheorganizationdevelopinganddefiningxDSLstandards,includingthoseaffectingADSL,SDSL,HDSL,andVDSL.MembersparticipateincommitteestovoteonADSLspecifications;auditingmembersreceivemarketingandtechnica

6、ldocumentation.ADSLTransmissionUnit-CentralOfficeTheADSLmodemorlinecardthatphysicallyterminatesanADSLconnectionatthetelephoneserviceprovider'sservingcentraloffice.ADSLTransmissionUnit-RemoteTheADSLmodemorPCcardthatphysicallyterminatesanADSLconnectionattheenduser'slocatio

7、n.AlwaysOnCurrentdial-upservicesrequiretheuserto"makeacall"totheISP.Theconnectionisonlyactiveduringthedurationofthecall.MostxDSLimplementations(includingADSL,UADSL,andSDSL)enabletheconnectiontobealwaysoninafashionsimilartoaLAN.AmericanWireGaugeAmeasureofthethicknessofcop

8、per,aluminum,andotherwiringintheUSandelsewhere.Coppercablingtypicallyvariesfrom18to26AWG,thehigherthenu