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1、Unit7Network【教学目的】oLearnabouttheEnglishtermsofNetwork:LAN（局域网）,WAN（广域网）,Band（波段）,bandwidth（带宽）,bridge（网桥）,repeater（转发器）,router（路由器）,fullduplex（全双工）,opticalfiber（光纤），packet（数据包）,starnetwork（星型网络）,switch（交换机）,hub（集线器）,TP,“TwistedPair”（双绞线）oImprovethestudents*abilitytounderstandthe
2、longanddifficultsentencesinthetext.oMasterthekeylanguagepointsandgrammaticalstructuresinthetext.oconsolidatethetechnicaltermsandimportantprofessionalphrasesbydoingexercises.【教学重点难点】olmportanttechnicalterms:LAN（局域网），WAN（广域网），band（波段）,bandwidth（带宽）,bridge（网桥），repeater（转发器）,router（
3、路由器）,fullduplex（全双工），opticalfiber（光纤）,packet（数据包），starnetwork（星型网络），switch（交换机），hub（集线器），TP,“twistedpair”（双绞线）oDifficultsentences:1.Opticalinputisconvertedtoelectricalformtorestoreacleansignal,whichdriveslasersthatfullyrestorestheopticalsignalattheoriginalsignalstrength.2・Thetwi
4、stsareimportant:theygiveitelectricalcharacteristicswhichallowsomekindsofcommunicationsotherwisenotpossible・oReviewtheimportantpointsofessentialEnglishforwardvt・buffervt.characterizevt.【教学步骤】StepOneReadandexplainTextAtothestudentsandaskthestudentstokeepinmindthefollowingprofessio
5、nalterms:Network（网纟各）:agroupofcomputersworkingtogether;thephysicalwireetc.connectingthecomputersLAN（局域网）：LocalAreaNetworkWAN（广域网）：WideAreaNetworkband（波段）:Arangeoffrequenciesbetweentwodefinedlimits.bandwidth（带宽）:Ameasureofcapacityofinformation-carryingcapacityonacommunicationscha
6、nnel.bridge（网桥）：Adatacommunicationsdevicethatconnectstwoormorenetworksegmentsandforwardspacketsbetweenthem.repeater（车专发器）：1.Equipmentthatreceivesalow-powersignal,possiblyconvertingitfromlighttoelectricalform,amplifyingitorretimingandreconstructingitfortransmission.2.Anoptoelectr
7、icaldeviceusedateachendandoccasionallyintermediatepointsofexceptionallylongfiberopticspan.router（路由器）:Anetworkdevicethatconnectstwosimilarnetworkshavingthesamenetworkprotocol.fullduplex（全双工）:Thesimultaneoustransmissionofdatainbothdirections,usedwhencommunicatingbetweentwocompute
8、rs.opticalfiber（）匕纤）:Thinfilamentsofglassthroug
