高级通信工程师考试复习题.docx

高级通信工程师考试复习题.docx

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高级通信工程师考试复习题

通信英语强化训练试题

（一）

Ⅰ单项选择题：

（Choosethebestone）

（）1.Furthermore,weshallprovethataminimumtheoreticalsamplingfrequencyoforder6.8kHzisrequired_________avoicechannel_________therange300Hzto3.4kHz.

A.convey,occupyB.toconvey,occupying

C.conveying,occupiedD.convey,tooccupy

（）2.Forexample,thesignal_________fromasatellite,_________infarouterspace,isveryweak.

A.received,locatedB.receive,locate

C.receiving,locatingD.toreceive,tolocate

（）3.Ifweconsiderbinarytransmission,thecompleteinformationaboutaparticularmessagewillalways_________bysimply_________thepresenceorabsenceofthepulse.

A.obtain,detectB.beobtained,detecting

C.obtained,detectedD.obtaining,detected

（）4.4.Thereisaninherentadvantagefor_________noisyenvironmentsby_________digitaltransmission.

A.overcoming,chooseB.overcome,choosing

C.overcome,chooseD.overcoming,choosing

（）5.Eachvoicechannelhasaseparatecoder，theunit_________convertssampledamplitudevaluestoasetofpulses;Anddecoder,theunit_________performsthereverseoperation.

A.who,whoB.when,when

C.where,whereD.that,that

（）6.Theproblemiseasilyovercomeby_________aframeformat,whereatthestartofeachframeauniquesequenceofpulsesisplaced_________thestartoftheframe.

A.specify,identifyB.specifying,soastoidentify

C.specified,identifiedD.specify,identifying

（）7.Anasynchronousserialdatalinkissaid_________characteroriented，asinformationistransmittedintheformofgroupsofbits_________characters.

A.be，callingB.tobeing，tocall

C.been，callD.tobe，called

（）8.Thisinterfaceissocalledbecausethe_________dataandthe_________dataarenotsynchronizedoveranyextendedperiod.

A.transmit，receiveB.totransmit，toreceive

C.transmitting，receivingD.transmitted，received

（）9.Serialdatatransmissionsystems_________inthetelephone，Morsecode,andeventhesmokesignalsonce_________bynativeAmericans.

A.arefinding，usingB.arefound，used

C.find,useD.befound,using

（）10.Traditionally，theidlestate_________themarklevel.Byconventionthiscorresponds_________alogical1level.

A.isreferredto,asB.isreferredas,in

C,isreferredtoas,toD.isreferred，within

（）11.Thetransmitterthensendsthecharacter，1bitatatime，by_________eachsuccessivebitonthelineforadurationofTseconds,_________allbitshavebeentransmitted.

A.place,stillB.placed，since

C.placing,untilD.placing，because

（）12.WhenthedatalinkconnectsaCRTterminal_________acomputer，_________problemsarise,astheterminalisitselfcharacteroriented.

A.into,manyB.on，afew

C.in,afewD.to，few

（）13._________thereceivingendofasynchronousserialdatalink，thereceivercontinuallymonitorstheline_________astartbit.

A.On，lookingB.Within，lookfor

C.In,lookatD.At，lookingfor

（）14.Ascompaniesrealizedtheycouldsavemoneyandgainproductivityby_________networkingtechnology,theyaddednetworksandexpanded_________networksalmostasrapidlyasnewnetworktechnologiesandproductscouldbeintroduced.

A.use,existB.using,existing

C.touse,toexistD.used,existed

（）15.TheOSIreferencemodelallowsyou_________thenetworkfunctionsthatoccurateachlayer.Moreimportantly,theOSIreferencemodelisaframeworkyoucanuse_________howinformationtravelsthroughoutanetwork.

A.view,understandB.viewing,understanding

C.viewed,understoodD.toview,tounderstand

（）16.Thetransportlayersegmentsdatafromthe_________host’ssystemandreassemblesthedataintoadatastreamonthe_________host’ssystem.

A.sending,receivingB.tosend,toreceive

C.sent,receivedD.send,receive

（）17.Thedatalinklayerprovidesthetransitofdata_________aphysicallink.Insodoing,thedatalinklayerisconcerned_________physicaladdressing,networktopology,networkmediaaccess,anderrordetection.

A.with,acrossB.at,in

C.between,inD.across,with

Ⅱ短语英译汉：

（TranslatethefollowingphrasesintoChinese）

1.theschemesforperformingthesethreefunctions

2.aseriesofamplitudevalues

3.aspeechchanneloftelephonequality

4.asequenceof8-binarydigits

5.aminimumtheoreticalsamplingfrequency

6.avoicechanneloccupyingtherange300Hzto3.4kHz

7.8-digitspersamplevalue

8.thesparkingofacarignitionsystem

9.thestreamofthepulseswitharepetitionrateof64kHz

10.therelationshipofthetruesignaltothenoisesignal

11.thesignalreceivedfromasatellite

12.thecompleteinformationaboutaparticularmessage

13.theshapeofthetransmittedsignal

14.theattenuationintroducedbytransmissionpath

15.theunitthatconvertssampledamplitudevaluetoasetofpulses

16.asequencerelatingtochannel1,2andsoon

17.auniquesequenceofpulsescalledsynchronizationword

18.terrestrialsystem

19.thepresenceorabsenceofthepulse

20.ahigh-speedelectronicswitch

21.thetimedivisionmultiplexer

22.TimeDivisionMultiplexing

23.asynchronousserialdatatransmission

24.themostpopularserialinterface

25.thetransmitteddata

26.theclocksatthetransmitterandreceiver

27.theeraofteleprinter

28.thedotsanddashesofacharacter

29.threetimesthedurationofintersymbolspace

30.thegroupofbitscalledcharacters

31.theinvariableunitscomprising7or8bitsofinformation

32.aclockgeneratedlocallybythereceiver

33.thereceivedparitybitfollowingthecharacter

34.thefallingedgeofthestartbit

35.thecharacter-orientednatureofthedatalink

36.networkingtechnology

37.proprietarynetworkingsystem

38.theInternationalOrganizationforStandardization

39.compatibilitybetweenthevarioustypesofnetworks

40.sevennumberedlayers

41.standardizationofnetworkcomponents

42.errorrecovery

43.receivinghost'ssystem

44.connection-orientedcircuits

45.informationflowcontrol

46.networktopology

47.networkmediaaccess

48.electricalspecification

49.maximumtransmissiondistance

Ⅲ短语汉译英：

（TranslatethefollowingphrasesintoEnglish）

1.抽样量化与编码

2.话路

3.幅值

4.抽样频率

5.抽样速率

6.脉冲流

7.重复率

8.编码过程

9.模拟信号

10.传输质量

11.数字通信

12.数字传输

13.含噪声的环境

14.传输路由

15.信噪比

16.信号电平

17.地面系统

18.噪声功率

19.二进制传输

20.反向操作

21.8位码序列

22.接收端

23.帧格式

24.同步字

25.串行接口

26.显示终端

27.发送器与接收器

28.数据传输

29.数据流

30.闲置状态

31.传号电平

32.空号电平

33.起始位

34.停止位

35.T秒的持续时间

36.奇偶校验位

37.错误标志

38.传输错误

39.下降沿

40.符号间的空格

41.接收机的定时

42.本地时钟

43.磁带

44.控制比特

45.逻辑1电平

46.二进制数据

47.明显的缺点

48.联网技术

49.国际标准化组织

50.参考模型

51.数据分组

52.应用程序

53.网络媒体

54.分层

55.硬件和软件

56.表示层

57.传输层

58.数据链路层

59.网络服务

60.文件接入

61.数据格式

62.主机

63.协议

64.连接

65.逻辑选址

Ⅳ请将下述短文译成中文（短文英译汉）：

（TranslatethefollowingpassagesintoChinese）

1.Ifweconsiderbinarytransmission,thecompleteinformationaboutaparticularmessagewillalwaysbeobtainedbysimplydetectingthepresenceorabsenceofthepulse.Bycomparison,mostotherformsoftransmissionsystemconveythemessageinformationusingtheshape,orlevelofthetransmittedsignal;parametersthataremosteasilyaffectedbythenoiseandattenuationintroducedbythetransmissionpath.Consequentlythereisaninherentadvantageforovercomingnoisyenvironmentsbychoosingdigitaltransmission.

2.Thereadermayask,howdoesthedemultiplexerknowwhichgroupof8-digitsrelatestochannel1,2,andsoon?

Clearlythisisimportant!

Theproblemiseasilyovercomebyspecifyingaframeformat,whereatthestartofeachframeauniquesequenceofpulsescalledtheframecode,orsynchronizationword,isplacedsoastoidentifythestartoftheframe.Acircuitofthedemultiplexerisarrangedtodetectthesynchronizationword,andtherebyitknowsthatthenextgroupof8-digitscorrespondstochannel1.

3.Noisecanbeintroducedintotransmissionpathinmanydifferentways;perhapsviaanearbylightningstrike,thesparkingofacarignitionsystem,orthethermallow-levelnoisewithinthecommunicationequipmentitself.Itistherelationshipofthetruesignaltothenoisesignal,knownasthesignal-to-noiseratio,whichisofmostinteresttothecommunicationengineer.

4.Basically,ifthesignalisverylargecomparedtothenoiselevel,thenaperfectmessagecantakeplace;however,thisisnotalwaysthecase.Forexample,thesignalreceivedfromasatellite,locatedinfarouterspace,isveryweakandisatalevelonlyslightlyabovethatofthenoise.Alternativeexamplesmaybe.Foundwithinterrestrialsystemswhere,althoughthemessagesignalisstrong,soisthenoisepower.

5.Sofarwehaveassumedthateachvoicechannelhasaseparatecoder,theunitthatconvertssampledamplitudevaluestoasetofpulses;anddecoder,theunitthatperformsthereverseoperation.Thisneednotbeso,andsystemsareinoperationwhereasinglecodesissharedbetween24,30,oreven120separatechannels.

6.Ahigh-speedelectronicswitchisusedtopresenttheanaloginformationsignalofeachchannel,takeninturn,tothecodec.Thecodecisthenarrangedtosequentiallysampletheamplitudevalue,andcodethisvalueintothe8-digitsequence.Thustheoutputtothecodecmaybeseenasasequenceof8pulsesrelatingtochannel1,thenchannel2,andsoon.Thisunitiscalledatimedivisionmultiplexer.

7.Anasynchronou