2023年全國碩士研究生考試考研英語一試題真題（含答案詳解+作文范文）_第1頁
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1、Copyright?2008IEEE.Allrightsreserved.1IEEEStardfInfmationtechnology—Telecommunicationsinfmationexchangebetweensystems—Localmetropolitanareawks—SpecificrequirementsPart3:CarrierSenseMultipleAccesswithCollisionDetection(CS

2、MACD)accessmethodPhysicalLayerspecificationsSECTIONTHREE:ThissectionincludesClause34throughClause43Annex36AthroughAnnex43C.(Thirdprinting:22June2010.)34.Introductionto1000Mbsbasebwk34.1OverviewGigabitEthercouplesanextend

3、edversionoftheISOIEC88023(CSMACDMAC)toafamilyof1000MbsPhysicalLayers.TherelationshipsamongGigabitEthertheextendedISOIEC88023(CSMACDMAC)theISOIECOpenSystemInterconnection(OSI)referencemodelareshowninFigure34–1.GigabitEthe

4、rusestheextendedISOIEC88023MAClayerinterfaceconnectedthroughaGigabitMediaIndependentInterfacelayertoPhysicalLayerentities(PHYsublayers)suchas1000BASELX1000BASESX1000BASECX1000BASET.GigabitEtherextendstheISOIEC88023MACbey

5、ond100Mbsto1000Mbs.Thebitrateisfasterthebittimesareshter—bothinproptiontothechangeinbwidth.Infullduplexmodetheminimumpackettransmissiontimehasbeenreducedbyafactoften.Achievabletopologiesf1000Mbsfullduplexoperationarecomp

6、arabletothosefoundin100BASETfullduplexmode.Inhalfduplexmodetheminimumpackettransmissiontimehasbeenreducedbutnotbyafactoften.Cabledelaybudgetsaresimilartothosein100BASET.Theresultingachievabletopologiesfthehalfduplex1000M

7、bsCSMACDMACaresimilartothosefoundinhalfduplex100BASET.34.1.1ReconciliationSublayer(RS)GigabitMediaIndependentInterface(GMII)TheGigabitMediaIndependentInterface(Clause35)providesaninterconnectionbetweentheMediaAccessContr

8、ol(MAC)sublayerPhysicalLayerentities(PHY)betweenPHYLayerStationManagement(STA)entities.ThisGMIIsuppts1000Mbsoperationthroughitseightbitwide(octetwide)transmitreceivepaths.TheReconciliationsublayerprovidesamappingbetweent

9、hesignalsprovidedattheGMIItheMACPLSservicedefinition.IEEECSMACDStd802.32008Copyright?2008IEEE.Allrightsreserved.334.1.5AutoNegotiationtype1000BASETAutoNegotiation(Clause28)isusedby1000BASETdevicestodetecttheabilities(mod

10、esofoperation)supptedbythedeviceattheotherendofalinksegmentdeterminecommonabilitiesconfigurefjointoperation.AutoNegotiationisperfmeduponlinkstartupthroughtheuseofaspecialsequenceoffastlinkpulses.34.1.6ManagementManagedob

11、jectsattributesactionsaredefinedfallGigabitEthercomponents(Clause30).ThatclauseconsolidatesallIEEE802.3managementspecificationssothatagentscanbemanagedbyexistingwkmanagementstationswithlittlenomodificationtotheagentcode.

12、34.2StatediagramsStatediagramstakeprecedenceovertext.Theconventionsof1.2areadoptedalongwiththeextensionslistedin21.5.34.3Protocolimplementationconfmancestatement(PICS)profmaThesupplierofaprotocolimplementationthatisclaim

13、edtoconfmtoanypartofIEEE802.3Clause35throughClause41shallcompleteaprotocolimplementationconfmancestatement(PICS)profma.AcompletedPICSprofmaisthePICSftheimplementationinquestion.ThePICSisastatementofwhichcapabilitiesoptio

14、nsoftheprotocolhavebeenimplemented.APICSisincludedattheendofeachclauseasappropriate.EachoftheGigabitEtherPICSconfmstothesamenotationconventionsusedin100BASET(see21.6).34.4RelationofGigabitEthertootherstardsSupptedapplica

15、tionsf10GigabitEthercanbefoundinISOIEC11801:2002AnnexF.SuitableentriesfTableG1ofISOIEC11801:1995AnnexGwouldbeasfollows:a)WithinthesectionOpticalLink:CSMACD1000BASESXISOIEC88023PDAM26b)WithinthesectionOpticalLink:CSMACD10

16、00BASELXISOIEC88023PDAM26c)WithinthesectionBalancedCablingLinkClassD(definedupto100MHz):CSMACD1000BASETISOIEC88023DAD1995Tosuppt1000BASETapplicationsClassDlinksshallmeettherequirementsfreturnlossELFEXTMDELFEXTspecifiedin

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