Communications quality of service A framework and definitions

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1、INTERNATIONALTELECOMMUNICATIONUNIONITU-TG.1000TELECOMMUNICATION(11/2001)STANDARDIZATIONSECTOROFITUSERIESG:TRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSQualityofserviceandperformanceCommunicationsqualityofservice:AframeworkanddefinitionsITU-TRecommendationG.1000ITU-TG-SERIESRECOMMENDA

2、TIONSTRANSMISSIONSYSTEMSANDMEDIA,DIGITALSYSTEMSANDNETWORKSINTERNATIONALTELEPHONECONNECTIONSANDCIRCUITSG.100–G.199GENERALCHARACTERISTICSCOMMONTOALLANALOGUECARRIER-G.200–G.299TRANSMISSIONSYSTEMSINDIVIDUALCHARACTERISTICSOFINTERNATIONALCARRIERTELEPHONEG.300–G.399SYSTEMSONMETALLICLINESGENERALCHAR

3、ACTERISTICSOFINTERNATIONALCARRIERTELEPHONEG.400–G.449SYSTEMSONRADIO-RELAYORSATELLITELINKSANDINTERCONNECTIONWITHMETALLICLINESCOORDINATIONOFRADIOTELEPHONYANDLINETELEPHONYG.450–G.499TESTINGEQUIPMENTSG.500–G.599TRANSMISSIONMEDIACHARACTERISTICSG.600–G.699DIGITALTERMINALEQUIPMENTSG.700–G.799DIGITA

4、LNETWORKSG.800–G.899DIGITALSECTIONSANDDIGITALLINESYSTEMG.900–G.999QUALITYOFSERVICEANDPERFORMANCEG.1000–G.1999TRANSMISSIONMEDIACHARACTERISCTICSG.6000–G.6999DIGITALTERMINALEQUIPMENTSG.7000–G.7999Forfurtherdetails,pleaserefertothelistofITU-TRecommendations.ITU-TRecommendationG.1000Communication

5、squalityofservice:AframeworkanddefinitionsSummaryThisRecommendationgivesaframeworkanddefinitionsforcommunicationsqualityofservicesoastoestablishauniformapproachtoqualityofserviceacrosstheITU-Tandeliminatetheconfusionresultingfromdifferentframeworksandinconsistentdefinitions.Improvedconsisten

6、cyregardingqualityofserviceisneededthroughoutthecommunicationsindustry,especiallyinIP-relatedareaswithinandoutsidetheITU.ThisRecommendationprovidesapractical"top-down"pathfromageneralqualitydefinition(ISO8402)toaQoSdefinition(ITU-TRec.E.800)tonetworkperformance(ITU-TRec.I.350,andY.1540)toafu

7、nctionalbreakdownofallcomponentsofservicequality(theQoSdefinitionmatrixofETSIETR003).AdditionallypresentedarefourviewpointsofQoSthatmakethedefinitionsandframeworkmeaningfulforeveryone:users,vendors,networkoperators,serviceproviders,etc.Thisoveralla