工业计算机网络作业Word格式文档下载.docx
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standardsorconventions.Forcommunicationbetween
exchangenetworkestablishedrules,
Data
2.WhatisaProtocol?
systems.Two entitiesin order tocommunicate,there must beofthe same
language,"
and, forthe content of communications,howcommunicationandwhencommunicationmustcomplywithcertainrequirements,theseprovisionsisanagreement.Canalsobesimplydefinedas:
asetofrulestocontroldataexchangebetweenthetwoentities.Theconnectionofelectronic
communication,differentlevelshave their ownprotocol.For example,
inthehardwareleveland application-leveldataexchangehas its
ownprotocol.IntheOpen SystemsInterconnection
(OSI)standardmodel,eachlayerhasone totwo
protocols,thecommunicationterminalmustbeabletorecognizeandabidebytheagreement.Theprotocolhasbeendescribedoftenintheformofindustrialorinternationalstandards.
3.TheNetworkEdg
EDGistheEnhancedDataRatesforGSMEvolution.EDGisaGSMto3Gtransition,it
ismainlyusedintheGSMsystem,anewmodulationmethod,thatisthemost
advancedmulti-slotoperation and8PSK modulation.8PSKGMSK
modulationsignalspaceusedbytheexistingGSMnetworkcanbeextendedfrom2to
8,sotheinformationcontainedineachsymbolisfourtimestheoriginal.
第二次作业:
1.PleasecomparethedifferencebetweentheCircuitSwitchingandPacket
switching.
Circuitswitchingisthemostbackwardexchangemustfirstestablishacircuitconnection(virtualcircuit),andthenfordataexchange,dataexchangeafterthereleasecircuit.In this
wayexchangeisrelativelyreliable,buttheefficiencyofnetworkutilizationisverylow.Generallydonotusethisexchange.
Packetswitchingisthemostcommonwayofexchange,itisadatagramintoseveralfragments,andthenweresentsimultaneously,eachpieceofdatathroughthelineroutingisnotthesame,eachpieceofdatatogoroutingaccordingtothespecificcircumstancesofthenetworkanduseroutingprotocolsto decide.Toreachthedestination node,thenall thedatafragmentsandre-assembled.Linehighefficiencyintheuseofthisexchange.
VCis also
known
asvirtual
connectionorvirtualchannelisatwopacket-
switchedtransmission.Communications andnetworks,theVCisaconnection-
orientedcommunication servicesprovidedbythepacket-
switchedcommunications.Establishalogicalconnectionorvirtual
circuitbetweentwo nodesor applicationprocess,you canturnbetweentwo
nodessendeachgrouping,to accepttheclient
receivesthepacketsequencemustbeconsistentwiththeorderofthe sending
end,not
responsible
forthe receiving
endinthecollectionofpacketreordering.VCprotocoltothehigher layer
protocolstohidedataisdividedintosegments,theprocessofpacketsorframes.
2.Pleasegavesomeexamplesofvirtualcircuitnetwork,istheInternetisoneoftheVCnetwork?
3.Whatisaccessnetwork,whatkindofaccessnetworkismostusedintheuniversitiesintheworld?
Withthecommunicationtechnologyistherapiddevelopmentoftelecommunication
servicestothedevelopmentofintegrated,digital,intelligent,broadbandandpersonaldirection,
realizationofvoice,data,image,"
oneline,thefirst-linehouseholds,"
laidthefoundation.Howtofullyutilizetheexistingnetworkresourcestoincreasethetypeofbusiness,improveservicequality,hasbecomethetelecomexperts
andoperatorsareincreasinglyconcernedabouttheresearchtopic,the"
lastmile"
solutionisthefocusofmostconcern.Therefore,theaccess
networktobecomethehotspotofnetworkapplicationsandconstruction.
4.Pleasecomparethedifferencebetweenbasebandcoaxialcableandbroadbandcoaxialcable
Basebandcoaxialcable,coaxialcabletothehardcoppercore,outsourcingalayerofinsulatingmaterial.Thislayerofinsulatingmaterialclosely
wovenmeshconductorsurround-network,coveringalayerof
protectivematerial.Therearetwowidelyusedcoaxialcable.A50ohmcablefordigitaltransmission,usedforbasebandtransmission,alsocalledbasebandcoaxialcable;
theotheris75ohmcableforanalogtransmission,broadbandcoaxialcable.Thisdifferenceiscausedbyhistoricalreasons,andnotduetotechnicalreasonsormanufacturer.
Coaxialcableofthisstructure,ithashighbandwidthandexcellentnoiserejectioncharacte