ITU-TG.989.1(022001)(英)Phonelinenetworkingtransceivers-Foundation.pdf

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1、INTERNATIONALTELECOMMUNICATIONUNIONITU-TG.989.1TELECOMMUNICATION(02/2001)STANDARDIZATIONSECTOROFITUSERIESG:TRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSDigitalsectionsanddigitallinesystem–OpticallinesystemsforlocalandaccessnetworksPhonelinenetwor

2、kingtransceivers-FoundationITU-TRecommendationG.989.1(FormerlyCCITTRecommendation)ITU-TG-SERIESRECOMMENDATIONSTRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSINTERNATIONALTELEPHONECONNECTIONSANDCIRCUITSG.100–G.199GENERALCHARACTERISTICSCOMMONTOALLANA

3、LOGUECARRIER-G.200–G.299TRANSMISSIONSYSTEMSINDIVIDUALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONEG.300–G.399SYSTEMSONMETALLICLINESGENERALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONEG.400–G.449SYSTEMSONRADIO-RELAYORSATELLITELINKSANDINTERCONNECTIONWITH

4、METALLICLINESCOORDINATIONOFRADIOTELEPHONYANDLINETELEPHONYG.450–G.499TESTINGEQUIPMENTSG.500–G.599TRANSMISSIONMEDIACHARACTERISTICSG.600–G.699DIGITALTERMINALEQUIPMENTSG.700–G.799DIGITALNETWORKSG.800–G.899DIGITALSECTIONSANDDIGITALLINESYSTEMG.900–G.999General

5、G.900–G.909ParametersforopticalfibrecablesystemsG.910–G.919Digitalsectionsathierarchicalbitratesbasedonabitrateof2048kbit/sG.920–G.929Digitallinetransmissionsystemsoncableatnon-hierarchicalbitratesG.930–G.939DigitallinesystemsprovidedbyFDMtransmissionbea

6、rersG.940–G.949DigitallinesystemsG.950–G.959DigitalsectionanddigitaltransmissionsystemsforcustomeraccesstoISDNG.960–G.969OpticalfibresubmarinecablesystemsG.970–G.979OpticallinesystemsforlocalandaccessnetworksG.980–G.989AccessnetworksG.990–G.999Forfurther

7、details,pleaserefertothelistofITU-TRecommendations.ITU-TRecommendationG.989.1Phonelinenetworkingtransceivers-FoundationSummaryThisRecommendationspecifiesthebasiccharacteristicsofdevicesdesignedforthetransmissionofdataoverin-premisesphonelinenetworks.Thes

8、edevicesareintendedtobecompatiblewithexistingtelephonydevicesonthein-premisesphonelinenetwork.Additionally,theRecommendationprovidesforspectrumnotchingforcompatibilitywithAmateurRadioservices.ThisRecommendationdefines:•the