计算机专业英语的课文与翻译

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1、Unit8ComputerNetworkingText1DataCommunicationsTheendequipmentcanbecomputers,printers,keyboards,CRTs,andsoon.Theyareeithergeneratesthedigitalinformationfortransmissionorusesthereceiveddigitaldata.Thisequipmentgenerallyoperatesdigitalinformationinternallyinword

2、units.DTEisdataterminalequipment.Astationcontroller(STACO)isthecorrespondingunitatthesecondaries.Atonetime,theDTEwasthelastpieceofequipmentthatbelongedtothesubscriberinadatalinksystem.BetweentheDTEs,firstisthemodem,andthenisthecommunicationsequipment.Thecommu

3、nicationequipmentisownedandmaintainedbyTelco.Datacommunicationsequipment(DCE)acceptstheserialdatastreamfromtheDTE.AndDCEconvertsittosomeformofanalogsignalsuitablefortransmissiononvoice-gradelines.Atthereceiveend,theDCEperformsthereversefunction.Itconvertsther

4、eceivedanalogsignaltoaserialdigitaldatastream.ThesimplestformofDCEisamodem(modulator/demodulator)ordataset.Atthetransmitend,themodemcanbeconsideredaformofdigital-to-analogconverter.Whileatthereceiveend,itcanbeconsideredaformofanalog-to-digitalconverter.参考译文数据

5、通信终端设备可以是计算机、打印机、键盘、CRT等。它们可以生成要发送的数字信息，也可以使用所接收的数字数据。这种设备通常在内部以字为单位处理数字信息。DTE一般称为数据终端设备。辅助设备一方的相应设备是工作站控制器（STACO）。同时，DTE也是数据链路系统中属于用户端的最后一个设备。在两个DTE之间，先是调制解调器，接着是属于Telco电话公司维护的通信设备。数据通信设备（DCE）从DTE接收串行数据流，并将其转换成适合于在语音线路上发送的某种模拟信号形式。在接收端，DCE完成相反的功能，把接收到的模拟信号转换

6、成串行数字数据流。最简单的DCE是调制解调器或数据传送机。在发送端，调制解调器可以视为一种数/模转换器，而在接收端则可视为一种模／数转换器。Text2ArchitectureofComputerNetworksComputernetworkisacomplexunit,itconsistsoftwoormoreconnectedcomputingunits.Itisusedforthepurposeofdatacommunicationandresourcesharing.Designofanetworkandi

7、tslogicalstructureshouldcomplywithasetofdesignprinciples.Theyinclude:theorganizationoffunctions,thedescriptionofdataformatsandprocedure.Inthefollowingtwosectionswewilldiscusstwoimportantnetworkarchitectures,theOSIreferencemodelandtheTCP/IPreferencemodel.(1)th

8、eOSIreferencemodelTheOSI(opensystemsinterconnection)modelwascreatedbytheISO.Thismodelisafoundationforcomparingprotocols;However,moreprotocolsdeviatefromtherulessetupbytheOSImodel.TheOSImo