ITU-T G.109 (09 1999) (英) Definition of categories of speech ……

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1、INTERNATIONALTELECOMMUNICATIONUNIONG.109TELECOMMUNICATION(09/99)STANDARDIZATIONSECTOROFITUSERIESG:TRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSInternationaltelephoneconnectionsandcircuits–GeneraldefinitionsDefinitionofcategoriesofspeechtransmissionqualityITU-TRecommendationG.109(Previousl

2、yCCITTRecommendation)ITU-TG-SERIESRECOMMENDATIONSTRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSINTERNATIONALTELEPHONECONNECTIONSANDCIRCUITSG.100–G.199GeneraldefinitionsG.100–G.109GeneralRecommendationsonthetransmissionqualityforanentireinternationalG.110–G.119telephoneconnectionGeneralchar

3、acteristicsofnationalsystemsformingpartofinternationalconnectionsG.120–G.129Generalcharacteristicsofthe4-wirechainformedbytheinternationalcircuitsandG.130–G.139nationalextensioncircuitsGeneralcharacteristicsofthe4-wirechainofinternationalcircuits;internationaltransitG.140–G.149Generalcharacterist

4、icsofinternationaltelephonecircuitsandnationalextensionG.150–G.159circuitsApparatusassociatedwithlong-distancetelephonecircuitsG.160–G.169TransmissionplanaspectsofspecialcircuitsandconnectionsusingtheinternationalG.170–G.179telephoneconnectionnetworkProtectionandrestorationoftransmissionsystemsG.

5、180–G.189SoftwaretoolsfortransmissionsystemsG.190–G.199INTERNATIONALANALOGUECARRIERSYSTEMGENERALCHARACTERISTICSCOMMONTOALLANALOGUECARRIER-G.200–G.299TRANSMISSIONSYSTEMSINDIVIDUALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONEG.300–G.399SYSTEMSONMETALLICLINESGENERALCHARACTERISTICSOFINTERNATIONALCAR

6、RIERTELEPHONEG.400–G.449SYSTEMSONRADIO-RELAYORSATELLITELINKSANDINTERCONNECTIONWITHMETALLICLINESCOORDINATIONOFRADIOTELEPHONYANDLINETELEPHONYG.450–G.499TESTINGEQUIPMENTSTRANSMISSIONMEDIACHARACTERISTICSG.600–G.699DIGITALTRANSMISSIONSYSTEMSTERMINALEQUIPMENTSG.700–G.799DIGITALNETWORKSG.800–G.899DIGITA

7、LSECTIONSANDDIGITALLINESYSTEMG.900–G.999Forfurtherdetails,pleaserefertoITU-TListofRecommendations.ITU-TRECOMMENDATIONG.109DEFINITIONOFCATEGORIESOFSPEECHTRANSMISSIONQUALITYSummaryThisRecommendationdefinesfivecategorieso