ITU-T G.993.2 Amendment 1 (04 2007) (英) Very high

InternationalTelecommunicationUnionITU-TG.993.2TELECOMMUNICATIONSTANDARDIZATIONSECTOROFITUAmendment1(04/2007)SERIESG:TRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSDigitalsectionsanddigitallinesystem–AccessnetworksVeryhighspeeddigitalsubscriberlinetransceivers2(VDSL2)Amendment1ITU-TRecommendationG.993.2(2006)–Amendment1ITU-TG-SERIESRECOMMENDATIONSTRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSINTERNATIONALTELEPHONECONNECTIONSANDCIRCUITSG.100–G.199GENERALCHARACTERISTICSCOMMONTOALLANALOGUECARRIER-TRANSMISSIONSYSTEMSG.200–G.299INDIVIDUALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONESYSTEMSONMETALLICLINESG.300–G.399GENERALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONESYSTEMSONRADIO-RELAYORSATELLITELINKSANDINTERCONNECTIONWITHMETALLICLINESG.400–G.449COORDINATIONOFRADIOTELEPHONYANDLINETELEPHONYG.450–G.499TRANSMISSIONMEDIAANDOPTICALSYSTEMSCHARACTERISTICSG.600–G.699DIGITALTERMINALEQUIPMENTSG.700–G.799DIGITALNETWORKSG.800–G.899DIGITALSECTIONSANDDIGITALLINESYSTEMG.900–G.999GeneralG.900–G.909ParametersforopticalfibrecablesystemsG.910–G.919Digitalsectionsathierarchicalbitratesbasedonabitrateof2048kbit/sG.920–G.929Digitallinetransmissionsystemsoncableatnon-hierarchicalbitratesG.930–G.939DigitallinesystemsprovidedbyFDMtransmissionbearersG.940–G.949DigitallinesystemsG.950–G.959DigitalsectionanddigitaltransmissionsystemsforcustomeraccesstoISDNG.960–G.969OpticalfibresubmarinecablesystemsG.970–G.979OpticallinesystemsforlocalandaccessnetworksG.980–G.989AccessnetworksG.990–G.999QUALITYOFSERVICEANDPERFORMANCE–GENERICANDUSER-RELATEDASPECTSG.1000–G.1999TRANSMISSIONMEDIACHARACTERISTICSG.6000–G.6999DATAOVERTRANSPORT–GENERICASPECTSG.7000–G.7999PACKETOVERTRANSPORTASPECTSG.8000–G.8999ACCESSNETWORKSG.9000–G.9999Forfurtherdetails,pleaserefertothelistofITU-TRecommendations.ITU-TRec.G.993.2(2006)/Amd.1(04/2007)iITU-TRecommendationG.993.2Veryhighspeeddigitalsubscriberlinetransceivers2(VDSL2)Amendment1SummaryThisAmendment1toG.993.2includesthefollowing:1)Addednotetoimplementers,issue12.2.4.1.12)RevisionofTable6-1,issue6.23)TosupportPSDshapingintheUS0band,revisetextin7.2.1.1.1and7.2.1.1.2,andaddnew7.2.1.1.3basedonProposalUS0shapingR1ratherthanD0492R1,issue7.2.1.24)ReviseTable7-2(stopbandPSDmax),issue7.2.45)TosupportthenewSRA,revisetextin9.4.1basedonrevise_9.4.16)TosupporttheoptionalOLRmechanisms(eocmessages),revise11.2.3.3,13.1,13.2and13.3basedonCD-076R1andCD-077R1,issue13.1.107)Toindicateoptionalvsmandatorysupportofeocmessages,reviseTables11-2,11-3,11-4,11-5,11-25,11-26,and11-27basedoneoc_mandatory_vs_optional8)ReviseOLRtextin13.2and13.4basedonCD-072andCD-074,issues13.1.2.6.5,13.1.2.5.89)TosupporttheoptionalOLRmechanisms,revise11.2.3.3,13.1,13.2,13.3,12.3.5.2.1.1,and12.3.5.2.2.1basedonfvdp-C-190,issues13.1.11,13.1.1310)Revise11.2.3.11todefineaBlockVectorReadcommandbasedonCD-025R1,issue11.2.5.211)Revise11.2.3.11,11.4.1andaddnew11.4.1.1.9basedonHomeworkINP_acteocmessageR1,issue11.2.6.112)TosupporttherevisionofAnnexC,reviseTables12-5,12-8,12-11,and12-14basedonC0100,issue12.2.3.113)TosupportshapingoftheUS0band,reviseTables12-3,12-5,12-6,12-9,12-11,and12-12basedonHWUS0ShapingCodepointsVDSL214)Tosupportthenewchannelinitializationpolicy,revise12.3.5.2.1.2(O-TPS),12.3.5.2.2.1(R-MSG2),andAnnexKbasedonGeneva-R17A3R2,issue12.2.6.1.5.215)TosupportthenewInitializationsuccess/failurecode,revise12.3.5.2.1.4(O-PMD)and12.3.5.2.2.4(R-PMD)basedonC0255R1,issue12.2.6.4.116)TosupporttheoptionalOLRmechanisms,reviseinitializationtextin12basedonGB-078R1,issue13.1.8.117)TosupportSRA,reviseinitializationtextin12.3.5.2.1.1,12.3.5.2.1.2,13.4andAnnexKbasedonHomeworkSRAinitmessageR118)Addnew14.3InputcapacitancebasedonD0670andD0671,issue14.219)ReviseAnnexAbasedonC0066,issueA.0.120)ReplaceAnnexBbasedonC0068,furtherrevisedbycorrectioninBT-update-ref-table-b-5-corrigenda-G.993.2Amendment1R1,issueB.1.1.iiITU-TRec.G.993.2(2006)/Amd.1(04/2007)21)RevisionofAnnexCandnewAppendixbasedonCD-028andCD-029,andEditorialupdatefromDraft_AnnexC,issuesB.3.2,C.2.3.3.2,C.2.3.3.3,C.2.5SourceAmendment1toITU-TRecommendationG.993.2(2006)wasapprovedon6April2007byITU-TStudyGroup15(2005-2008)undertheITU-TRecommendationA.8procedure.ThisamendmentincludesthemodificationsintroducedbyCorrigendum1toAmendment1,approvedon29July2007byITU-TStudyGroup15(2005-2008)undertheITU-TRecommendationA.8procedure.ThisamendmentalsoincludesthemodificationsintroducedbyCorrigendum2approvedon29July2007byITU-TStudyGroup15(2005-2008)undertheITU-TRecommendationA.8procedure.ITU-TRec.G.993.2(2006)/Amd.1(04/2007)iiiFOREWORDTheInternationalTelecommunicationUnion(ITU)istheUnitedNationsspecializedagencyinthefieldoftelecommunications.TheITUTelecommunicationStandardizationSector(ITU-T)isapermanentorganofITU.ITU-Tisresponsibleforstudyingtechnical,operatingandtariffquestionsandissuingRecommendationsonthemwithaviewtostandardizingtelecommunicationsonaworldwidebasis.TheWorldTelecommunicationStandardizationAssembly(WTSA),whichmeetseveryfouryears,establishesthetopicsforstudybytheITU-Tstudygroupswhich,inturn,produceRecommendationsonthe