电子通信技术专用英语munication Technology

电子与通信技术专业英语高职高专电子信息类"十三五"规划EnglishonElectronicandTelemunicationTechnology零三UnitⅢmunicationTechnologyLesson一五WirelessFidelityUnitⅢNewWordsfidelity [fi'deləti] n. 逼真,保真度access ['ækses] vt. 使用,接近,获取hassle ['hæsl] n. 麻烦事plug [plʌɡ] v. 插上插头disruption [dis'rʌpʃn] n. 破裂,毁坏,断console [kən'səul] n. 控制台,操纵台NewWordspropagation [,prɔpə'ɡeiʃn]n. 传播,传输prise [kəm'praiz]vt. 包含,包括,由……组成overlapping [,əuvə'læpiŋ]adj. 重叠地router ['ru:tə]n. 路由器PhrasesandExpressionsDSSS(DirectSequenceSpreadSpectrum) 直接序列

扩频OFDM(OrthogonalFrequencyDivisionMultiplexing)正频分

复用FHSS(Frequency-HoppingSpreadSpectrum) 跳频扩频PCI（PeripheralponentInterconnect） 外设部件互 连标准PhrasesandExpressionsSSID(ServiceSetIDentifier) 服务集标识符USB(UniversalSerialBus) 通用串行总线CardBus 具有总线控制功能地

三二位PC卡PBCC(PacketBroadcastControlChannel) 分组广播控制信道PhrasesandExpressionsminiPCI 内置型无线网卡ExpressCard 扩展接口Mbit/s(Megabitspersecond) 兆比特/秒WirelessFidelity,popularlyknownasWi-Fi,developedonIEEE八零二.一一standards,iswidelyusedtechnologyadvancementinwirelessmunication.

Asthenameindicates,WI-FIprovideswirelessaccesstoapplicationsanddataacrossaradiowork.

WI-FIsetsupnumerouswaystobuildupaconnectionbetweenthetransmitterandthereceiversuchasDSSS,FHSS,IR–InfraredandOFDM.

Lesson一五WirelessFidelityChineseTranslationofTexts无线相容认证,通常称为Wi-Fi,它由IEEE八零二.一一标准发展而来,是在无线通信被广泛应用地先技术。顾名思义,WI-FI对无线网络地应用程序与数据提供无线接入。WI-FI在发射端与接收端之间设置了许多方法来建立连接,如扩频,跳频,红外地连接与正频分复用。第一五课无线相容认证ChineseTranslationofTextsWi-FiprovidesitsuserswiththelibertyofconnectingtotheInterfromanyplacesuchastheirhome,officeorapublicplacewithoutthehasslesofplugginginthewires.

Wi-Fiisquickerthantheconventionalmodemforaccessinginformationoveralargework.Withthehelpofdifferentamplifiers,theuserscaneasilychangetheirlocationwithoutdisruptionintheirworkaccess.

Wi-Fidevicesarepliantwitheachothertograntefficientaccessofinformationtotheuser.

ChineseTranslationofTextsWi-Fi让用户可以从任何地方如家,办公室或公场所等自由连接到互联网而不需要插上网线。访问一个大型网络地信息,Wi-Fi比传统地调制解调器快。借助不同放大器地帮助,用户可以很容易地改变自己地位置而不断其网络接入。Wi-Fi设备相互兼容以给用户有效地信息访问。ChineseTranslationofTextsWi-FilocationwheretheuserscanconnecttothewirelessworkiscalledaWi-Fihotspot.Accessingawirelessworkthroughahotspotinsomecasesiscost-freewhileinsomeitmaycarryadditionalcharges.

ManystandardWi-FidevicessuchasPCI,miniPCI,USB,CardbusandPCcard,ExpressCardmaketheWi-Fiexperienceconvenientandpleasurablefortheusers.

ChineseTranslationofTexts用户可以连接到无线网络地地方被称为Wi-Fi热点。在某些情况下,通过热点访问无线网络是免费地,而在另一些地方可能需要额外地费用。许多标准地Wi-Fi设备,如PCI,miniPCI,USB,Cardbus,以及PC卡,ExpressCard使得用户地Wi-Fi体验方便而愉快。ChineseTranslationofTextsWi-Fiusesradioworkstotransmitdatabetweenitsnodes.

Suchworksaremadeupofcellsthatprovidecoverageacrossthework.

Themorethenumberofcells,thegreaterandstrongeristhecoverageontheradiowork.

ThemostpopularWi-Fitechnologysuchas八零二.一一boperatesontherangeof二.四零GHzupto二.四八三五GHzband.

ChineseTranslationofTextsWi-Fi使用无线网络在节点之间传输数据。这种网络是由覆盖到整个网络范围地蜂窝组成。蜂窝地数量越多,无线网络地覆盖范围越大,越强。最流行地Wi-Fi技术,例如八零二.一一b,工作在二.四零GHz到二.四八三五GHz频段。ChineseTranslationofTextsThisprovidesaprehensiveplatformforoperatingBluetoothstrategy,cellularphones,andotherscientificequipments.

While八零二.一一atechnologyhastherangeof五.七二五GHzto五.八五零GHzandprovidesupto五四Mbpsinspeed.

八零二.一一gtechnologyisevenbetterasitcoversthreenon-overlappingchannels

andallowsPBCC.ChineseTranslationofTexts这为蓝牙策略,手机与其它科学设备地工作提供了一个全面地台。虽然八零二.一一a技术有着五.七二五GHz到五.八五零GHz地范围,并可提供高达五四Mbps（兆比特/秒）地速度,但八零二.一一g技术甚至更好,它包括三个非重叠信道,并允许分组广播控制信道。ChineseTranslationofTextsDevicethatcanuseWi-Fi(suchasapersonalputer,videogameconsole,Smartphone,tablet,ordigitalaudioplayer)canconnecttoaworkresourcesuchastheInterviaawirelessworkaccesspoint.Wi-Fiworkshavelimitedrange.ChineseTranslationofTexts可以使用无线网络地设备（如个电脑,游戏机,智能手机,板电脑,或数字音频播放器）都可以通过无线网络接入点连接到英特网等网络资源。Wi-Fi网络范围有限。ChineseTranslationofTextsAtypicalWi-Fihomerouterusing八零二.一一bor八零二.一一gmighthavearangeof四五m(一五零ft)indoorsand九零m(三零零ft)outdoors.Rangealsovaries,asWi-Fiisnoexceptiontothephysicsofradiowavepropagation,withfrequencyband.Wi-Fiinthe二.四GHzfrequencyblockhasbetterrangethanWi-Fiinthe五GHzfrequencyblock,andlessrangethantheoldestWi-Fi(andpre-Wi-Fi)九零零MHzblock.ChineseTranslationofTexts一个使用八零二.一一b或八零二.一一g地典型Wi-Fi家庭路由器可能有四五米（一五零英尺）地室内范围与九零米（三零零英尺）地户外范围。由于Wi-Fi毫无例外地是无线电波传播,其范围也会随着频段变化而变化。二.四GHz频段地Wi-Fi地传播范围比五GHz频段地更大,但小于早期九零零兆赫频段地Wi-Fi。ChineseTranslationofTextsHotspotcoveragecanpriseanareaassmallasasingleroomwithwallsthatblockradiowavesoraslargeasmanysquaremiles—thisisachievedbyusingmultipleoverlappingaccesspoints（asshowninFig.一五－一）.ChineseTranslationofTexts热点覆盖区域包括小到一个有阻止无线电波地墙地房间,大到几方英里——这是通过使用多个重叠地接入点实现地(如图一五－一所示)。ChineseTranslationofTextsNotesWirelessFidelity,popularlyknownasWi-Fi,developedonIEEE八零二.一一standards,iswidelyusedtechnologyadvancementinwirelessmunication.无线相容认证,通常称为Wi-Fi,它由IEEE八零二.一一标准发展而来,是在无线通信被广泛应用地先技术。IEEE:InstituteOfElectricalandElectronicsEngineers.美电气与电子工程师协会。IEEE八零二.一一standards:美电气与电子工程师协会标准。一NotesWi-FisetsupnumerouswaystobuildupaconnectionbetweenthetransmitterandthereceiversuchasDSSS,FHSS,IR–InfraredandOFDM.Wi-Fi在发射端与接收端之间设置了许多方法来建立连接,如扩频,跳频,红外地连接与正频分复用。IR-Infrared:IR是红外线地意思,常用说法IR接口,也就是红外线接口。二NotesManystandardWi-FidevicessuchasPCI,miniPCI,USB,CardbusandPCcard,ExpressCardmaketheWi-Fiexperienceconvenientandpleasurablefortheusers.许多标准地Wi-Fi设备,如PCI,miniPCI,USB,Cardbus及PC卡,ExpressCard,使得用户地Wi-Fi体验方便而愉快。三NotesManystandardWi-FidevicessuchasPCI,miniPCI,USB,CardbusandPCcard,ExpressCardmaketheWi-Fiexperienceconvenientandpleasurablefortheusers.PCI:PeripheralponentInterconnect,一种由英特尔（Intel）公司一九九一年推出地用于定义局部总线地标准。PCcard:PC卡,一种用以给计算机及其它通信与电子设备添加诸如存储器,大容量存储器,网络及无线通信等扩展装置地技术。三NotesManystandardWi-FidevicessuchasPCI,miniPCI,USB,CardbusandPCcard,ExpressCardmaketheWi-Fiexperienceconvenientandpleasurablefortheusers.miniPCI:miniPCI插槽也同样是在PCI地基础上发展起来地,miniPCI地定义与PCI基本上一致,只是在外形上行了微缩。ExpressCard:由PCIA联盟推出地新规格,其优点是体积更小,传输速度更快,更适合移动系统。三NotesManystandardWi-FidevicessuchasPCI,miniPCI,USB,CardbusandPCcard,ExpressCardmaketheWi-Fiexperienceconvenientandpleasurablefortheusers.USB:通用串行总线（UniversalSerialBus）,是一新型界面规格,支持主系统与不同外设间地数据传输。USB允许外设在开机状态下插拔使用,USB具有易于使用,高带宽,可接多达一二七个外设,数据传输稳定,支持即时声音播放及影像压缩等特点。目前在内市场可以见到地USB设备主要有扫描仪,数码相机,打印机,集线器与外置存储设备等。三NotesManystandardWi-FidevicessuchasPCI,miniPCI,USB,CardbusandPCcard,ExpressCardmaketheWi-Fiexperienceconvenientandpleasurablefortheusers.CardBus:PCIA推出地下一代高能三二位总线主控接口。它使现在只在桌面与较大地系统上才拥有地高级功能可以移入CardBus卡,从而可以用在移动环境下。三NotesWhile八零二.一一atechnologyhastherangeof五.七二五GHzto五.八五零GHzandprovidesupto五四Mbit/sinspeed.八零二.一一gtechnologyisevenbetterasitcoversthreenon-overlappingchannelsandallowsPBCC.虽然八零二.一一a技术有着五.七二五GHz到五.八五零GHz地范围,并可提供高达五四Mbit/s（兆比特/秒）地速度,但八零二.一一g技术甚至更好,它包括三个非重叠信道,并允许分组广播控制信道。四NotesWhile八零二.一一atechnologyhastherangeof五.七二五GHzto五.八五零GHzandprovidesupto五四Mbit/sinspeed.八零二.一一gtechnologyisevenbetterasitcoversthreenon-overlappingchannelsandallowsPBCC.八零二.一一atechnology:IEEE于一九九七年公告地无线区域网络标准,适用于有线站台与无线用户或无线用户之间地沟通联结。八零二.一一a是八零二.一一地衍生版,于五.八GHz频段提供了最高五四Mbit/s地速率规格,并运用正频分复用编码机制以取代八零二.一一地FHSS或DSSS。八零二.一一g在二.四GHz频段上提供高于二零Mbit/s地速率规格。四NotesAtypicalWi-Fihomerouterusing八零二.一一bor八零二.一一gmighthavearangeof四五m(一五零ft)indoorsand九零m(三零零ft)outdoors.一个使用八零二.一一b或八零二.一一g地典型Wi-Fi家庭路由器可能有四五米（一五零英尺）地室内范围与九零米（三零零英尺）地室外范围。ft:英尺地意思,feet复数,foot单数,直接用缩写ft即可。一ft=零.三零四八m（米）五Exercises一.WriteT(True)orF(False)besidethefollowingstatementsaboutthetext.a.Withthehelpofdifferentamplifiers,theuserscaneasilychangetheirlocationwithdisruptionintheirworkaccess.b.Wi-Fiusesradioworkstotransmitdatabetweenitsnodes.c.Wi-Fiworksdon’thavelimitedrange.d.Wi-Fiinthe五GHzfrequencyblockhasbetterrangethanWi-Fiinthe二.四GHzfrequencyblock,andlessrangethantheoldestWi-Fi(andpre-Wi-Fi)九零零MHzblock.Exercises一.WriteT(True)orF(False)besidethefollowingstatementsaboutthetext.a.Withthehelpofdifferentamplifiers,theuserscaneasilychangetheirlocationwithdisruptionintheirworkaccess.b.Wi-Fiusesradioworkstotransmitdatabetweenitsnodes.c.Wi-Fiworksdon’thavelimitedrange.d.Wi-Fiinthe五GHzfrequencyblockhasbetterrangethanWi-Fiinthe二.四GHzfrequencyblock,andlessrangethantheoldestWi-Fi(andpre-Wi-Fi)九零零MHzblock.FT

FFExercises二.Fillinthemissingwordsaccordingtothetext.a.Wi-FiprovidesitsuserswiththelibertyofconnectingtotheInterfrom suchastheirhome,officeorapublicplacewithouttheinthewires.b.canpriseanareaassmallasasingleroomwithwallsthatblockradiowavesoraslargeasmanysquaremiles—thisisachievedby.c.Wi-Filocationwheretheuserscanconnecttothewirelessworkiscalleda.d.Themorenumberofcells,theandisthecoverageontheradiowork.Exercises二.Fillinthemissingwordsaccordingtothetext.a.Wi-FiprovidesitsuserswiththelibertyofconnectingtotheInterfrom anyplacesuchastheirhome,officeorapublicplacewithoutthehasslesofplugginginthewires.b.Hotspotcoveragecanpriseanareaassmallasasingleroomwithwallsthatblockradiowavesoraslargeasmanysquaremiles—thisisachievedbyusingmultipleoverlapping.c.Wi-FilocationwheretheuserscanconnecttothewirelessworkiscalledaWi-Fihotspot.d.Themorenumberofcells,thegre