综合测试一.docx

综合测试一.docx

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综合测试一

模拟试卷二

分值

题号

Ⅰ

Ⅱ

Ⅲ

Ⅳ

Ⅴ

TOTALSCORE

一、单项选择题（每题只有一个正确答案，每题1分，共10分）

1.Thecircuitissetupbyaspecialsignalingmessage_____findsitswaythroughthenetwork,channelsinthepathasitproceeds.

A.that,seizingB.where,seizing

C.who,seizedD.one,beseized

2.Avariationofmessageswitchingispacketswitching.Herethemessageisbrokenupintoseveralpiecesofamaximumlength,packets.

A.given,calledB.give,call

C.giving,callingD.togive,tocall

3.Eachsubscriberconnectslocallooptoaswitchingcenter,asanendoffice.

A.to,callingB.with,known

C.the,knowD.via,known

4.Althoughoriginallydesignedand______toserviceanalogtelephonesubscribers,thetelephonenetworkhandlessubstantialdatatrafficmodem,andgraduallybeingconvertedtoadigitalnetwork..

A.implemented,viaB.implementing,in

C.toimplement,withinD.design,on

5.ISDN’senormousimportanceisonlygraduallybeing.YearsofworkhavebeenbytheCCITTandtheISO.

A.understand,carryB.understanded,carried

C.tobeunderstood,tocarryD.understood,carriedout

6.Similarly,theintroductionofvoiceencodingtechniques_____pulsecodemodulationcontributedtheISDN’sconceptevolution.

A.usage,onB.using,to

C.use,withD.used,soasto

7.Theenhancedqualityisachievedwhenasignalisdigitallyencodeddegradationthetransmissionmedium.

A.overcome,toB.overcame,with

C.overcoming,overD.toovercome,dueto

8.Theswitchingelementisacomputeramessageprocessor,withprocessingandstoragecapabilities.Messagetravelsindependentlyandasynchronously,theirownwayfromsourcetodestination.

A.tocall,findB.calling,found

C.referredtoas,findingD.becalled,sending

9.Designershavefounditconvenientthesenodesintoahierarchyortreetopology,fiveclassesofswitchingcentersornodes.

A.organization,consistB.organize,consisting

C.toorganize,consistingofD.organizing,toconsist

10.Asregardseconomy,earlystudiessuggestedthatdigitalservices_____significantadvantagessinceasubstantialquantityofinterfaceequipmentinthetelephoneexchangecould.

A.offered,beeliminatedB.offer,eliminate

C.offers,iseliminatedD.tooffer,toeliminate

二、英译汉短语（每题1分，共15分）

1.awelldefinedblockofdatacalledamessage

2.thestore-and-forwardtransmissiontechnique

3.circuitswitching

4.source-destinationpair

5.lowdelayconstraintrequiredbytheuser

6.thefunctionofconcentratingtraffic

7.thesubscriberthattransmitdigitalsignal

8.thebranchesbetweennodes

9.treetopology

10.adjacentendoffices

11.basicorderofselection

12.theintegratedservicesdigitalnetwork

13.standardizedports

14.globalcommunications

15.substantialquantityofinterfaceequipment

16.voiceencodingtechniques

17.experimentaltechnology

三、汉译英短语（每题1分，共15分）

1、报文交换

2、目的地址

3、传输时延

4、报文处理机

5、专用电话

6、交换节点

7、数字数据系统

8、数据流量

9、半双工的

10、拓扑

11、路由

12、开放网络

13、国际标准化组织

14、带宽限制

15、基本接入

四、阅读理解（每题2分，共20分），根据文章内容判断（√）（X）

PASSAGEONE

Therearetwobasictypesofswitchingtechniques:

circuitswitchingandmessageswitching.Incircuitswitching,atotalpathofconnectedlinesissetupfromtheorigintothedestinationatthetimethecallismade,andthepathremainsallocatedtothesource-destinationpair（whetherusedornot）untilitisreleasedbythecommunicatingparties.Theswitches,calledcircuitswitches（orofficeexchangeintelephonejargon）,havenocapabilityofstoringormanipulatinguser’sdataontheirwaytothedestination.Thecircuitissetupbyaspecialsignalingmessagethatfindsitswaythroughthenetwork,seizingchannelsinthepathasitproceeds.Oncethepathisestablished,areturnsignalinformsthesourcetobegintransmission.Directtransmissionofdatafromsourcetodestinationcanthentakeplacewithoutanyinterventiononthepartofthesubnet.

Inmessageswitching,thetransmissionunitisawell-definedblockofdatacalledamessage.Inadditiontothetexttobetransmitted,amessagecomprisesaheaderandachecksum.Theheadercontainsinformationregardingthesourceanddestinationaddressesaswellasothercontrolinformation;thechecksumisusedforerrorcontrolpurposes.Theswitchingelementisacomputerreferredtoasamessageprocessor,withprocessingandstoragecapabilities.Messagestravelindependentlyandasynchronously,findingtheirownwayfromsourcetodestination.Firstthemessageistransmittedformthehosttothemessageprocessortowhichitisattached.Oncethemessageisentirelyreceived,themessageprocessorexaminesitsheader,andaccordinglydecidesonthenextoutgoingchannelonwhichtotransmitit.Ifthisselectedchannelisbusy,themessagewaitsinaqueueuntilthechannelbecomesfree,atwhichtimetransmissionbegins.Atthenextmessageprocessor,themessageisagainreceived,stored,examined,andtransmittedonsomeoutgoingchannel,andthesameprocesscontinuesuntilthemessageisdeliveredtoitsdestination.Thistransmissiontechniqueisalsoreferredtoasthestore-and-forwardtransmissiontechnique.

1.Therearetwobasictypesofswitchingtechniques,messageswitchingandpacketswitching.（）

2.Theswitches,calledcircuitswitches（orofficeexchangeintelephonejargon）,havecapabilityofstoringormanipulatinguser’sdataontheirwaytothedestination.（）

3.Inmessageswitching,thetransmissionunitisawell-definedblockofdatacalledamessage.（）

4.Amessageonlycomprisesaheaderandachecksum.（）

5.Theswitchingelementisacomputerreferredtoasamessageprocessor,withoutprocessingandstoragecapabilities.（）

6.Theheaderonlycontainsinformationregardingthesourceanddestinationaddresses.（）

7.Theswitches,calledcircuitswitcheshavecapabilityofmanipulatinguse’sdataontheirwaytothedestination.（）

PASSAGETWO

ThetermISDNwasfirstdefinedwithintheCCITTin1972.Itreferredtoanetworkprovidingend-to-enddigitalconnectivityforarangeofservices.Italsousedtheideaofatotallyopennetworkwithuniversallyavailableandstandardized“ports”thatcanplugineverywhere.Theconcepthassincethenevolvedfromtheexistingtelephonenetworksofcountriesundergoingchangesduetotheintroductionoftotallynewdigitaltechnologyintheswitchingandtransmissionequipment.Similarly,theintroductionofvoiceencodingtechniquesusingpulsecodemodulationcontributedtotheconcept’sevolution.Initially,voiceencodingwasbasedupona64kbit/stransmissionrate.Todaytwo64kbit/s,or2B-channelscoupledwithabasicaccesssignalingrateof16kbit/s,thatis,theD-channel,constitutetheessentialIADNtransmissionrateof144kbit/s.CurrentlyPSTN,availableinalmost200countriesandterritoriesaroundtheworld,offersuniversalvoiceaccesstoalmost750milliontelephonesaroundtheworld.ISDNisthenetworkwhichwillprogressivelyprovideasimilaruniversalaccessfornotonlyvoicebutdata,facsimile,video,text,andotherservicesaswell.

Intheindustrializedcountries,theevolutionarynatureoftheISDNconcepthasbeenamatterofeconomicpracticalityconsideringthevasttelephoneinfrastructurealreadyinplace.Theprimaryemphasis,however,hasbeentheenhancementoftheservicesratherthanasinglereplacementoftheservicesratherthanasinglereplacementofexistingequipment.Thisevolutionaryapproachhasalsomeritformostofthedevelopingcountries,althoughinsomeinstanceswhereanalogfacilitiesdonotexistpresentlyorwheretheyareverylimited,thedirectinstallationofdigitalfacilitiescouldallowadirectleapfrogtoISDNcapabilities.

ManyplannersbelievethatthetransitionformexperimentalISDNtechnologytooperationalsystemwillbeconvincinglymadeinthenextfewyears.Certainlythe1990swillbethetimeofrapidoperationalgrowth.Iftrue,alotofissueswillhavetoberesolvedincomingmonthsratherthanincomingyears.ThecurrentstudyperiodoftheCCITT（1989～1992）will,ofnecessity,resolvevirtuallyallstandardsissuesonISDNincludingevenwidebandISDNfortransmissionratesupto155Mbit/s.

ISDNisnotafour-letterwork.Itisablueprinttotheelectroniccommunicationssystemofthefuture.

7）ThetermISDNwasfirstdefinedwiththeCCITTin1982.（）

8）ISDNreferredtoanetworkprovidingend-to-enddigitalconnectivityforarangeofservices.（）

9）Todaytwo64kbit/s,or2B-channelscoupledwithabasicaccesssignalingrateof16kbit/s,thatis,theD-channel,constitutetheessentialISDNtransmissionrateof144kbit/s（2B+D）.（）

10）ISDNisthenetworkwhichwillprogressivelyprovideasimilaruniversalaccessforonlyvoice,facsimileandvideo.（）

11）ISDNisablueprinttotheelectroniccommunicationssystemofthefuture.（）

12）TheauthorthinksthatalotofissuesonISDNwillhavetoberesolvedinafewmonths.（）

五、英译汉短文（每题10分，共40分）

1.Messagestravelindependentlyandasynchronously,findingtheirownwayfromsourcetodestination.Firstthemessageistransmittedfromthehosttothemessageprocessortowhichitisattached.Oncethemessageisentirelyreceived,themessageprocessorexaminesitsheader,andaccordinglydecidesonthenextoutgoingchannelonwhichtotransmitit.Ifthisselectedchannelisbusy,themessagewaitsinaqueueuntilthechannelbecomesfree,atwhichtimetransmissionbegins.

2.Byfarthelargestcircuit-switchednetworkisthepublictelecommunicationsnetwork—thetelephonenetwork.Thisisactuallyacollectionofnationalne