ITU-T J.218 (07 2007) (英) Cable modem IPv4 and IPv6 eRouter……

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1、InternationalTelecommunicationUnionITU-TJ.218TELECOMMUNICATION(07/2007)STANDARDIZATIONSECTOROFITUSERIESJ:CABLENETWORKSANDTRANSMISSIONOFTELEVISION,SOUNDPROGRAMMEANDOTHERMULTIMEDIASIGNALSInteractivesystemsfordigitaltelevisiondistributionCablemodemIPv4andIPv6eRouters

2、pecificationITU-TRecommendationJ.218ITU-TRecommendationJ.218CablemodemIPv4andIPv6eRouterspecificationSummaryITU-TRecommendationJ.218definesacoresetoffeaturesthatenablesmultiplesubscriberdevicestogainaccesstooperator-providedhighspeeddataserviceusingDOCSIS.Thiscore

3、setoffeaturesallowsforbothIPv4andIPv6enableddevicestogainconnectivitytotheInternet.TheeRouterisspecifiedasanembeddedservice/applicationfunctionalentity(eSAFE)deviceasdefinedinITU-TRecommendationJ.126thatisimplementedinconjunctionwithaDOCSIScablemodemdevice.Thecore

4、setoffeaturesdefinedinthisRecommendationincludestheabilitytoprovisionmultipleCPEdevices,adescriptionofhowtoforwarddatatoandfromCPEdevicesandalsotheabilitytoforwardIPmulticasttraffictoCPEdevices.SourceITU-TRecommendationJ.218wasapprovedon29July2007byITU-TStudyGroup

5、9(2005-2008)undertheITU-TRecommendationA.8procedure.ITU-TRec.J.218(07/2007)iFOREWORDTheInternationalTelecommunicationUnion(ITU)istheUnitedNationsspecializedagencyinthefieldoftelecommunications,informationandcommunicationtechnologies(ICTs).TheITUTelecommunicationSt

6、andardizationSector(ITU-T)isapermanentorganofITU.ITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationAssembly(WTSA),whi

7、chmeetseveryfouryears,establishesthetopicsforstudybytheITU-Tstudygroupswhich,inturn,produceRecommendationsonthesetopics.TheapprovalofITU-TRecommendationsiscoveredbytheprocedurelaiddowninWTSAResolution1.InsomeareasofinformationtechnologywhichfallwithinITU-T'spurvie

8、w,thenecessarystandardsarepreparedonacollaborativebasiswithISOandIEC.NOTEInthisRecommendation,theexpression"Administration"isusedforconcisenesstoindicat