ITU-TG.1020(072006)(英)Performanceparameterdefinitions…….pdf

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1、InternationalTelecommunicationUnionITU-TG.1020TELECOMMUNICATION(07/2006)STANDARDIZATIONSECTOROFITUSERIESG:TRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSQualityofserviceandperformance–Genericanduser-relatedaspectsPerformanceparameterdefinitionsforqualityofspeechandothervoicebandapplication

2、sutilizingIPnetworksITU-TRecommendationG.1020ITU-TG-SERIESRECOMMENDATIONSTRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSINTERNATIONALTELEPHONECONNECTIONSANDCIRCUITSG.100–G.199GENERALCHARACTERISTICSCOMMONTOALLANALOGUECARRIER-G.200–G.299TRANSMISSIONSYSTEMSINDIVIDUALCHARACTERISTICSOFINTERNATI

3、ONALCARRIERTELEPHONEG.300–G.399SYSTEMSONMETALLICLINESGENERALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONESYSTEMSG.400–G.449ONRADIO-RELAYORSATELLITELINKSANDINTERCONNECTIONWITHMETALLICLINESCOORDINATIONOFRADIOTELEPHONYANDLINETELEPHONYG.450–G.499TRANSMISSIONMEDIACHARACTERISTICSG.600–G.699DIGITALTER

4、MINALEQUIPMENTSG.700–G.799DIGITALNETWORKSG.800–G.899DIGITALSECTIONSANDDIGITALLINESYSTEMG.900–G.999QUALITYOFSERVICEANDPERFORMANCE–GENERICANDUSER-RELATEDG.1000–G.1999ASPECTSTRANSMISSIONMEDIACHARACTERISTICSG.6000–G.6999DATAOVERTRANSPORT–GENERICASPECTSG.7000–G.7999PACKETOVERTRANSPORTASPECTSG.8000–G.

5、8999ACCESSNETWORKSG.9000–G.9999Forfurtherdetails,pleaserefertothelistofITU-TRecommendations.ITU-TRecommendationG.1020PerformanceparameterdefinitionsforqualityofspeechandothervoicebandapplicationsutilizingIPnetworksSummaryThetransmissionofspeechandothervoicebandapplicationsoverpacketnetworksbring

6、swithitnew,sometimesunique,formsofqualitydegradation.Therearemanyexistingdefinitionsforpacketnetworkperformanceparameters,yetthedesiretocontrolthequalityofnon-elasticisochronousapplicationsrequiresadditional,complementaryinformation.ThepurposeofthisRecommendationistodefinepacketnetworkandtermina

7、lperformanceparametersthatbetterreflecttheperceivedqualityofthetargetapplications.ItislargelyfocusedonqualityimpairmentsresultingfromdelayvariationandpacketlosswhicharepeculiartoIPandotherpacket-basedtechnologies,andwhichdon