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TechnologyofModernCommunicationTextA:BluetoothBluetoothwirelesstechnologyisashort-rangecommunicationstechnologyintendedtoreplacethecablesconnectingportable(轻便的)andfixeddeviceswhilemaintaininghighlevelsofsecurity.ThekeyfeaturesofBluetoothtechnologyarerobustness(稳健),lowpower,andlowcost.TheBluetoothspecificationdefinesauniformstructureforawiderangeofdevicestoconnectandcommunicatewitheachother.蓝牙无线技术是一种小范围无线通信技术,旨在保持高安全级的基础上,在便携式设备与固定设备之间实现无线连接。蓝牙技术的主要特点是稳健,低功耗和低成本。蓝牙规范定义了一个统一的结构,适用范围广的设备连接并相互沟通。BluetoothtechnologyhasachievedglobalacceptancesuchthatanyBluetoothenabledevice,almosteverywhereintheworld,canconnecttootherBluetoothenableddevicesinproximity.Bluetoothenabledelectronicdevicesconnectandcommunicatewirelesslythroughshort-range,adhoc(特别)networksknownaspiconetsEachdevicecansimultaneouslycommunicatewithuptosevenotherdeviceswithinasinglepiconet.Eachdevicecanalsobelongtoseveralpiconetssimultaneously.PiconetsareestablisheddynamicallyandautomaticallyasBluetoothenableddevicesenterandleaveradioproximity.蓝牙技术已取得全球认可,使得任何支持蓝牙的设备,几乎在世界各地,可以连接到其他支持蓝牙的邻近装置。蓝牙功能的电子设备连接并通过短距离无线通信,特别网络,被称为微微网。每个设备可以同时在一个单一的微微网最多七个其他设备进行通信。每个设备也可以同时属于几个微微网。微网是动态和自动建立蓝牙功能的设备进入和离开无线电近炸。AfundamentalBluetoothwirelesstechnologystrengthistheabilitytosimultaneouslyhandlebothdataandvoicetransmissions.Thisenablesuserstoenjoyvarietyofinnovativesolutionssuchasahands-freeheadset(耳机)forvoicecalls,printingandfaxcapabilities,andsynchronizingPDA,laptop,andmobilephoneapplicationstonameafew.一个基本的蓝牙无线技术的力量是同时处理数据和语音传输的能力,这使得用户可以享受各种创新的解决方案,如免提耳机进行语音通话,打印和传真功能,并同步PDA,笔记本电脑,以及手机应用仅举几例。CoresystemTheBluetoothcoresystem,definedbyBluetoothspecification,isacommonservicelayerprotocolwhichcoversfourlowerlayersinsevenlayerprotocol.ServiceDiscoveryProtocol(SDP)andtheoverallprofilerequirementsaredefinedbyGenericAccessProfile(GAP)AcompleteBluetoothapplicationrequiresanumberofadditionalservicesandhigherlayerprotocolsthataredefinedintheBluetoothspecification核心系统蓝牙核心系统,通过蓝牙规范中定义的,是一种常见的服务层协议,它包括在7层协议四个较低层。服务发现协议(SDP)和整体轮廓的要求是由通用访问模式(GAP)定义一个完整的蓝牙应用程序需要的一定数量的在蓝牙规范中定义额外的服务和更高层协议。ThelowestthreelayersaresometimesgroupedintoasubsystemknownastheBluetoothcontroller(蓝牙控制器).Thisisacommonimplementationinvolvingastandardphysicalcommunicationsinterface(通信接口)betweentheBluetoothcontrollerandremainderoftheBluetoothsystemincludingthdeL2CAP,servicelayersandhigherlayers(knownastheBluetoothhost).Althoughthisinterfaceisoptional,thearchitectureisdesignedtoallowforitsexistenceandcharacteristics.TheBluetoothspecificationenableinteroperabilitybetweenindependentBluetoothenabledsystemsbydefiningtheprotocolmessagesexchangedbetweenequivalentlayers,andalsointeroperabilitybetweenindependentBluetoothsub-systemsbydefiningacommoninterfacebetweenBluetoothcontrollersandBluetoothhosts.最低的3层有时被分为称为蓝牙控制器的子系统。这是一个常见的实现涉及到蓝牙控制器和蓝牙系统,包括thdeL2CAP,服务层和更高的层(被称为蓝牙主机)的其余部分之间的物理标准通信接口。虽然这个接口是可选的,该架构的设计允许它的存在和特性。蓝牙规范定义的协议报文交换的对等层之间实现互操作性(互用性,协同工作的能力)的独立蓝牙系统之间,也通过定义蓝牙控制器和蓝牙主机之间的通用接口独立的蓝牙子系统之间的互操作性。Anumberoffunctionalblocksareshownandthepathofservicesanddatabetweenthese.Thefunctionalblocksshowninthediagramareinformative;ingeneraltheBluetoothspecificationdoesnotdefinethedetailsofimplementationexceptwherethisisrequiredforinteroperability.若干功能模块被示出并在它们之间的服务和数据的路径。在图中所示的功能块是信息;在一般的蓝牙规范没有定义实现的细节除非这是必需的互操作性。Standardinteractionsaredefinedforallinter-deviceoperation,whereBluetoothdevicesexchangeprotocolsignalingaccordingtotheBluetoothspecification.TheBluetoothcoresystemprotocolsaretheradio(RF(射频)protocol,linkcontrol(LC)protocol,linkmanager(LM)protocolandlogicallinkcontrolandadaptationprotocol(L2CAP),allofwhicharefullydefinedinsubsequentpartsoftheBluetoothspecification.Inaddition,theservicediscoveryprotocol(SDP)isaservicelayerprotocolrequiredbyallBluetoothapplications.标准的交互定义的所有设备间的操作,根据蓝牙规范,其中的蓝牙设备交换协议信令。蓝牙核心系统协议是无线电(RF(射频))协议,链路控制(LC)协议,链路管理器(LM)协议和逻辑链路控制和适配协议(L2CAP),所有这些在以后的部分被完全定义蓝牙规范。此外,该服务发现协议(SDP)是由所有的蓝牙应用所需的服务层协议。TheBluetoothcoresystemoffersservicesthroughanumberofserviceaccesspointsthatareshowninthediagramasellipses(椭圆).TheseservicesconsistofthebasicprimitivesthatcontroltheBluetoothcoresystem.Theservicescanbesplitintothreetypes.TherearedevicecontrolservicesthatmodifythebehaviorandmodesofaBluetoothdevice,transportcontrolservicesthatcreate,modifyandreleasetrafficbears(搬运者,载体)(channelsandlinks),anddataservicesthatareusedtosubmitdatafortransmissionovertrafficbearers.ItiscommontoconsiderthefirsttwoasbelongtotheC-planeandthelastasbelongtotheU-plane.蓝牙核心系统提供服务通过一些被图中所示为椭圆形服务访问点。这些服务包括用于控制蓝牙核心系统的基本原语。该服务可以分为三种类型:修改蓝牙设备的行为和模式,设备控制服务,创造交通管制服务,修改和释放的搬运者(信道和链路),数据服务通过交通搬运者用于提交数据传输的.它是常见的首先要考虑的两成属于C面,最后为属于U平面。AserviceinterfacetotheBluetoothcontrollersub-systemisdefinedsuchthattheBluetoothcontrollermaybeconsideredastandardpart.InthisconfigurationtheBluetoothcontrolleroperatesthelowestthreelayersandtheL2CAPlayeriscontainedwiththerestoftheBluetoothapplicationinahostsystem.Thestandardinterfaceiscalledthehosttocontrollerinterface(HCI).Implicationofthisstandardserviceinterfaceisoptional.服务接口到蓝牙控制器子系统被定义,使得所述蓝牙控制器可以被认为是标准的一部分。在此配置蓝牙控制器运行的最低三层和
本文标题:通信工程专业英语课文翻译
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