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第1页共9页绝密★启用前2006年4月高等教育自学考试全国统一命题考试通信英语试卷（课程代码2368）本试卷共6页，满分100分，考试时间150分钟。总分题号一二三四五核分人题分2030101030复查人得分一、单项选择题(本大题共20小题，每小题1分，共20分)在每小题列出的四个备选项中只有一个是符合题目要求的，请将其代码填写在题后的括号内。错选、多选、或未选均无分。Completeeachofthefollowingsentenceswiththecorrectanswer(20points)1．Inadditiontothetexttobetransmittedinmessageswitching,a_____comprisesaheaderandachecksum.()A．unitB．blockC．messageD．datum2．Manyobserversbelievethatthewidebandsubscriberloopsystemswouldideallyuse______.()A．coaxialcableB．wireC．opticalfibreD．open-wire3．The______ofyouruseoftheInternetisexchangingmessagesorobtaininginformation.()A．methodB．directionC．serviceD．goal4．Themostcommonlyusednetwork______iselectronicmail.()A．serviceB．entertainmentC．versionD．resource5．Oncethemessageisentirelyreceived,themessageprocessorexaminesitsheader,andaccordinglydecidesonthenextoutgoingchannel______whichtotransmitit.()A．byB．atC．forD．on6．Atthereceivingendofanasynchronousserialdatalink,thereceivercontinually______thelinelookingforastartbit.()A．modulatesB．investigatesC．observesD．monitors7．Theoperatorofalocaltelephoneswitchboardhadanoptiontotransmitanopticalor______signalforthesearchedpersonoverawirednetwork.()A．acousticalB．explosiveC．practicalD．integrated8．Theprimaryemphasis，however，hasbeenthe______ofservicesratherthanasimplereplacementofexistingequipment．()A．maximumB．enhancementC．encouragementD．propagation9．Eachofthesenetworkswasspeciallydesignedforthatspecificserviceand得分评卷人复查人第2页共9页isoftennotatall______totransportanotherservice．()A．capableB．practicalC．applicableD．considerable10．Anetworkcapableoftransportingalltypesofserviceswillbeabletoadaptitself______changingornewneeds.()A．forB．toConD．with11．Inthelongtermperspectivecellularsystems,usinga(n)______technologywillbecometheuniversalmethodoftelecommunication.()A．circuitB．analogueC．messageD．digital12.Thetechnologicalprogressintheminiaturizationofelectroniccircuitryintheearly1950sresulted______theexplosionofmanynewtypesofpagingsystemsusingwirelesstransmission.()A．fromB．withC．byD．in13．ThetransportsystemadoptedinSDHisanalogous______aroadtransportsystem.()A．withB．toC．asD．like14．Althoughtelecommunicationistherationaleformostofthecurrentinterestinfibreoptics,thiswasnotthe______duringtheearlydaysofthetechnology.()A．keyB．caseC．issueD．view15．Fibresdesignedforlowdispersionat1.55umwavelength,whichcorresponds______minimumfibreloss,arenowcommonlyusedinlongdistancetransmission.()A．withB．forC．toD．in16．TheSDHStandardsarebasedontheprinciplesofdirectsynchronousmultiplexingwhichisthekey______costeffectiveandflexibletelecommunicationnetworking.()A．ofB．forC．toD．in17．Asacomparisoninvoicecommunicationsahighdegreeoftransmissionirregularitiescanbe______.()A．sparedB．forgivenC．toleratedD．endured18．Withcircuitswitching,thereisalwaysaninitialconnectioncost______insettingupthecircuit.()A．toincurB．incurringC．beingincurredD．incurred19．Dependingonthesizeoftheitems______youneed“pallets”toallowsimplestackingwithinthetrailerpayloadarea.()A．toshipB．shippedC．beingshippedD．tobeshipping20．Thisis______thefactthatforlong-distancetransmissionthedigitalsignalcanberegeneratedateachrepeater,creatinganewnoise-freesignal.()A．concerningtoB．duetoC．thankstoD．because二、阅读理解，认真阅读下列四篇短文，没篇短文后有5个问题，根据短文的内容从A、B、C、D四个选项中，选择一个正确的答案，并将其代码填写得分评卷人复查人第3页共9页在题后的括号内（本大题共20小题，每小题1.5分，共30分）Readthefourpassageandanswerthequestions(30points)Passage1Abasiccellularsystemconsistsofthreeparts:amobileunit,acellsite,andamobiletelephoneswitchingoffice(MTSO),withconnectionstolinkthethreesubsystems.Amobiletelephoneunitcontainsacontrolunit,atransceiver,andanantennasystem.ThecellsiteprovidesinterfacebetweentheMTSOandthemobileunits.Ithasacontrolunit,radiocabinets,antennas,apowerplant,anddataterminals.Theswitchingofficecontainsthecellularprocessorandcellularswitch.Itinterfaceswithtelephonecompanyzoneoffices,controlscallprocessingandhandlesbillingactivities.TheMTSOistheheartofthecellularmobilesystem.Itsprocessorprovidescentralcoordinationandcellularadministration.Thecellularswitch,whichcanbeeitheranalogordigital,switchescallstoconnectmobilesubscriberstoothermobilesubscribersandtothenationwidetelephonenetwork.Italsocontainsdatalinksprovidingsupervisionlinksbetweentheprocessorandtheswitchandbetweenthecellsitesandtheprocessor.Theradiolinkcarriesthevoiceandsignalingbetweenthemobileunitandthecellsite.MicrowaveradiolinksorwirelinescarrybothvoiceanddatabetweenthecellsiteandtheMTSO.21.Witchofthefollowingdoesnotbelongtothebasicthreepartsofacellularsystem?()A．Theconnectionlinks.B．Themobileunit.C．Themobiletelephoneswitchingoffice.D．Thecellsite.22．Whichdevicehasn’ttheinterfacewithMTSO?()A．Thecellsite.B．Thenationwidetelephonenetwork.C．Themobiletelephoneunit.D．Telephonecompanyzoneoffices.23．Whichpartinabasiccellularsystemisresponsibleforbillingaffairs?()A．Telephonecompanyzoneoffices.B．Themobileunit.C．Thecellsite.D．MTSO.24．Thecellularswitchis______.()A．analog.B．digital.C．digitalcombinedwithanalog.D．analogordigital.25．Supervisionlinksisakindof______link.()A．data.B．radio.C．voice.D．microwave.Passage2Eachsubscriberconnectsvialocallooptoaswitch