計算機網絡專業(yè)英語 課件 L1-3 Text 3 Bus Topology

L1-3

Lesson1OverviewofComputerNetworks

Text3BusTopology要點KeyPoints：詞匯：終端詞匯：傳輸詞匯：接收、反射、吸收、確認詞匯：Common、commonly、normally理解和掌握：同步、同時理解和掌握：虛擬的、真實的、實際的表示原因的句型終端Inbustopology,allofthenodesofthenetworkareconnectedtoacommontransmissionmediumwhichhasexactlytwoendpoints(thisisthe“bus”,whichisalsocommonlyreferredtoasthebackboneortrunk).Alldatathatistransmittedbetweennodesinthenetworkistransmittedoverthiscommontransmissionmediumandisabletobereceivedbyallnodesinthenetworkvirtuallysimultaneously.Thetwoendpointsofthecommontransmissionmediumarenormallyterminatedwithadevicecalledaterminatorthatexhibitsthecharacteristicimpedanceofthetransmissionmediumandwhichdissipatesorabsorbstheenergythatremainsinthesignaltopreventthesignalfrombeingreflectedandpropagatedbackontothetransmissionmediumintheoppositedirection,whichwouldotherwisecauseinterferenceanddegradationofthesignalsonthetransmissionmedium.end-point\endpointterminal：終端（設備）、航站樓terminator：終端器，終結者termination：終止傳輸Inbustopology,allofthenodesofthenetworkareconnectedtoacommontransmissionmediumwhichhasexactlytwoendpoints(thisisthe“bus”,whichisalsocommonlyreferredtoasthebackboneortrunk).Alldatathatistransmittedbetweennodesinthenetworkistransmittedoverthiscommontransmissionmediumandisabletobereceivedbyallnodesinthenetworkvirtuallysimultaneously.Thetwoendpointsofthecommontransmissionmediumarenormallyterminatedwithadevicecalledaterminatorthatexhibitsthecharacteristicimpedanceofthetransmissionmediumandwhichdissipatesorabsorbstheenergythatremainsinthesignaltopreventthesignalfrombeingreflectedandpropagatedbackontothetransmissionmediumintheoppositedirection,whichwouldotherwisecauseinterferenceanddegradationofthesignalsonthetransmissionmedium.Transfer轉讓；轉接；移交；轉移（地方）；（使）換乘；轉存，轉錄；調動（工作）；傳染，傳播；使（運動員）轉隊；把（錢）轉到另一賬戶，機構上。動，名接收、反射、吸收、確認。。。。Inbustopology,allofthenodesofthenetworkareconnectedtoacommontransmissionmediumwhichhasexactlytwoendpoints(thisisthe“bus”,whichisalsocommonlyreferredtoasthebackboneortrunk).Alldatathatistransmittedbetweennodesinthenetworkistransmittedoverthiscommontransmissionmediumandisabletobereceivedbyallnodesinthenetworkvirtuallysimultaneously.Thetwoendpointsofthecommontransmissionmediumarenormallyterminatedwithadevicecalledaterminatorthatexhibitsthecharacteristicimpedanceofthetransmissionmediumandwhichdissipatesorabsorbstheenergythatremainsinthesignaltopreventthesignalfrombeingreflectedandpropagatedbackontothetransmissionmediumintheoppositedirection,whichwouldotherwisecauseinterferenceanddegradationofthesignalsonthetransmissionmedium.accept：確認（接收）主動或自愿地接受,經過考慮后同意接受。reject拒絕receive：僅僅指接到或收到這一事實Reflect反射（反方向折回），flexible靈活的（容易折的）Inflect彎曲，改變，Common、commonly、normallyInbustopology,allofthenodesofthenetworkareconnectedtoacommontransmissionmediumwhichhasexactlytwoendpoints(thisisthe“bus”,whichisalsocommonlyreferredtoasthebackboneortrunk).Alldatathatistransmittedbetweennodesinthenetworkistransmittedoverthiscommontransmissionmediumandisabletobereceivedbyallnodesinthenetworkvirtuallysimultaneously.Thetwoendpointsofthecommontransmissionmediumarenormallyterminatedwithadevicecalledaterminatorthatexhibitsthecharacteristicimpedanceofthetransmissionmediumandwhichdissipatesorabsorbstheenergythatremainsinthesignaltopreventthesignalfrombeingreflectedandpropagatedbackontothetransmissionmediumintheoppositedirection,whichwouldotherwisecauseinterferenceanddegradationofthesignalsonthetransmissionmedium.Inbustopology,allofthenodesofthenetworkareconnectedtoacommontransmissionmediumwhichhasexactlytwoendpoints(thisisthe“bus”,whichisalsocommonlyreferredtoasthebackboneortrunk).Alldatathatistransmittedbetweennodesinthenetworkistransmittedoverthiscommontransmissionmediumandisabletobereceivedbyallnodesinthenetworkvirtuallysimultaneously.Thetwoendpointsofthecommontransmissionmediumarenormallyterminatedwithadevicecalledaterminatorthatexhibitsthecharacteristicimpedanceofthetransmissionmediumandwhichdissipatesorabsorbstheenergythatremainsinthesignaltopreventthesignalfrombeingreflectedandpropagatedbackontothetransmissionmediumintheoppositedirection,whichwouldotherwisecauseinterferenceanddegradationofthesignalsonthetransmissionmedium.同步、同時和synchronous/synchronized（同步的），詞意完全不同virtual所表達的“事實上的”是指“看起來，但其實不是，并未在名義上或正式上獲得承認”虛擬的、真實的、實際的Inbustopology,allofthenodesofthenetworkareconnectedtoacommontransmissionmediumwhichhasexactlytwoendpoints(thisisthe“bus”,whichisalsocommonlyreferredtoasthebackboneortrunk).Alldatathatistransmittedbetweennodesinthenetworkistransmittedoverthiscommontransmissionmediumandisabletobereceivedbyallnodesinthenetworkvirtuallysimultaneously.Thetwoendpointsofthecommontransmissionmediumarenormallyterminatedwithadevicecalledaterminatorthatexhibitsthecharacteristicimpedanceofthetransmissionmediumandwhichdissipatesorabsorbstheenergythatremainsinthesignaltopreventthesignalfrombeingreflectedandpropagatedbackontothetransmissionmediumintheoppositedirection,whichwouldotherwisecauseinterferenceanddegradationofthesignalsonthetransmissionmedium.virtual（虛擬的；實質上的，事實上的）factual，infact（事實上，實際上）虛擬現(xiàn)實：virtualreality反義詞：real實際的；真實的；實在的actual（真實的，實際的）近義詞：valid，available，practical，effective，telling，significantInbustopology,allofthenodesofthenetworkareconnectedtoacommontransmissionmediumwhichhasexactlytwoendpoints(thisisthe“bus”,whichisalsocommonlyreferredtoasthebackboneortrunk).Alldatathatistransmittedbetweennodesinthenetworkistransmittedoverthis