ITU-T G.120 (12 1998) (英) Transmission characteristics of national networks

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1、INTERNATIONALTELECOMMUNICATIONUNIONITU-TG.120TELECOMMUNICATION(12/98)STANDARDIZATIONSECTOROFITUSERIESG:TRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSInternationaltelephoneconnectionsandcircuits–GeneralcharacteristicsofnationalsystemsformingpartofinternationalconnectionsT

2、ransmissioncharacteristicsofnationalnetworksITU-TRecommendationG.120(PreviouslyCCITTRecommendation)ITU-TG-SERIESRECOMMENDATIONSTRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSINTERNATIONALTELEPHONECONNECTIONSANDCIRCUITSG.100–G.199GeneraldefinitionsG.100–G.109GeneralRecomme

3、ndationsonthetransmissionqualityforanentireinternationalG.110–G.119telephoneconnectionGeneralcharacteristicsofnationalsystemsformingpartofinternationalG.120–G.129connectionsGeneralcharacteristicsofthe4-wirechainformedbytheinternationalcircuitsandG.130–G.139nationalextensioncirc

4、uitsGeneralcharacteristicsofthe4-wirechainofinternationalcircuits;internationaltransitG.140–G.149GeneralcharacteristicsofinternationaltelephonecircuitsandnationalextensionG.150–G.159circuitsApparatusassociatedwithlong-distancetelephonecircuitsG.160–G.169Transmissionplanaspectso

5、fspecialcircuitsandconnectionsusingtheinternationalG.170–G.179telephoneconnectionnetworkProtectionandrestorationoftransmissionsystemsG.180–G.189SoftwaretoolsfortransmissionsystemsG.190–G.199INTERNATIONALANALOGUECARRIERSYSTEMGENERALCHARACTERISTICSCOMMONTOALLANALOGUECARRIER-G.200

6、–G.299TRANSMISSIONSYSTEMSINDIVIDUALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONEG.300–G.399SYSTEMSONMETALLICLINESGENERALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONEG.400–G.449SYSTEMSONRADIO-RELAYORSATELLITELINKSANDINTERCONNECTIONWITHMETALLICLINESCOORDINATIONOFRADIOTELEPHONYA

7、NDLINETELEPHONYG.450–G.499TESTINGEQUIPMENTSTRANSMISSIONMEDIACHARACTERISTICSDIGITALTRANSMISSIONSYSTEMSTERMINALEQUIPMENTSG.700–G.799DIGITALNETWORKSG.800–G.899DIGITALSECTIONSANDDIGITALLINESYSTEMG.900–G.999Forfurtherdetails,pleaserefertoITU-TListofRecommendations.ITU-TRECOMMENDATIO

8、NG.120TRANSMISSIONCHARACTERISTICSOFNATIONALNETWORKSSum