ITU-TG.991.2(2003)Amendment1(072004)(英)Single-pair…….pdf

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1、INTERNATIONALTELECOMMUNICATIONUNIONITU-TG.991.2TELECOMMUNICATIONAmendment1STANDARDIZATIONSECTOR(07/2004)OFITUSERIESG:TRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSDigitalsectionsanddigitallinesystem–AccessnetworksSingle-pairhigh-speeddigitalsubscriberline(SHDSL)transcei

2、versAmendment1ITU-TRecommendationG.991.2(2003)–Amendment1ITU-TG-SERIESRECOMMENDATIONSTRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSINTERNATIONALTELEPHONECONNECTIONSANDCIRCUITSG.100–G.199GENERALCHARACTERISTICSCOMMONTOALLANALOGUECARRIER-G.200–G.299TRANSMISSIONSYSTEMSINDIV

3、IDUALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONEG.300–G.399SYSTEMSONMETALLICLINESGENERALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONEG.400–G.449SYSTEMSONRADIO-RELAYORSATELLITELINKSANDINTERCONNECTIONWITHMETALLICLINESCOORDINATIONOFRADIOTELEPHONYANDLINETELEPHONYG.450–G.499TES

4、TINGEQUIPMENTSG.500–G.599TRANSMISSIONMEDIACHARACTERISTICSG.600–G.699DIGITALTERMINALEQUIPMENTSG.700–G.799DIGITALNETWORKSG.800–G.899DIGITALSECTIONSANDDIGITALLINESYSTEMG.900–G.999GeneralG.900–G.909ParametersforopticalfibrecablesystemsG.910–G.919Digitalsectionsathierarchicalbitrat

5、esbasedonabitrateof2048kbit/sG.920–G.929Digitallinetransmissionsystemsoncableatnon-hierarchicalbitratesG.930–G.939DigitallinesystemsprovidedbyFDMtransmissionbearersG.940–G.949DigitallinesystemsG.950–G.959DigitalsectionanddigitaltransmissionsystemsforcustomeraccesstoISDNG.960–G

6、.969OpticalfibresubmarinecablesystemsG.970–G.979OpticallinesystemsforlocalandaccessnetworksG.980–G.989AccessnetworksG.990–G.999QUALITYOFSERVICEANDPERFORMANCE-GENERICANDUSER-RELATEDG.1000–G.1999ASPECTSTRANSMISSIONMEDIACHARACTERISTICSG.6000–G.6999DIGITALTERMINALEQUIPMENTSG.7000–

7、G.7999DIGITALNETWORKSG.8000–G.8999Forfurtherdetails,pleaserefertothelistofITU-TRecommendations.ITU-TRecommendationG.991.2Single-pairhigh-speeddigitalsubscriberline(SHDSL)transceiversAmendment1SummaryThisamendmentresolvesthepassingofatargetmargininanSHDSLaccesslinkwithrepeaters

8、andintroducestheadditionoftheTU-12/VC-12framing.Therevisionsr