CCITTE.426(111988)(英)Generalguidetothepercentage…….pdf

《CCITTE.426(111988)(英)Generalguidetothepercentage…….pdf》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、INTERNATIONALTELECOMMUNICATIONUNIONCCITTE.426THEINTERNATIONAL(11/1988)TELEGRAPHANDTELEPHONECONSULTATIVECOMMITTEESERIESE:OVERALLNETWORKOPERATION,TELEPHONESERVICE,SERVICEOPERATIONANDHUMANFACTORSInternationaltelephonenetworkmanagementandcheckingofserviceq

2、uality–CheckingthequalityoftheinternationaltelephoneserviceGENERALGUIDETOTHEPERCENTAGEOFEFFECTIVEATTEMPTSWHICHSHOULDBEOBSERVEDFORINTERNATIONALTELEPHONECALLSReeditionofCCITTRecommendationE.426publishedintheBlueBook,FascicleII.3(1988)NOTES1CCITTRecommend

3、ationE.426waspublishedinFascicleII.3oftheBlueBook.ThisfileisanextractfromtheBlueBook.WhilethepresentationandlayoutofthetextmightbeslightlydifferentfromtheBlueBookversion,thecontentsofthefileareidenticaltotheBlueBookversionandcopyrightconditionsremainun

4、changed(seebelow).2InthisRecommendation,theexpression“Administration”isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.©ITU1988,2007Allrightsreserved.Nopartofthispublicationmaybereproduced,byanymeanswhatsoe

5、ver,withoutthepriorwrittenpermissionoftheITU.RecommendationE.426GENERALGUIDETOTHEPERCENTAGEOFEFFECTIVEATTEMPTSWHICHSHOULDBEOBSERVEDFORINTERNATIONALTELEPHONECALLS1Generalconsiderations1.1Thesuccessofcallattemptsisfundamentaltoanautomaticinternationaltel

6、ephoneserviceofhighquality.11.2Theperiodicobservationofcompletionratioandthecategorizationoffailurestodestinationcountriestogetherwiththeexchangeofsuchinformationbetweencountriesarevaluabletoestablishand/ormaintainahighservicequality.1.3Thecallcompleti

7、onratioofthenationalnetworkofagivencountry,asmanifestedthroughitsinternationalswitchingcentre(s),affectstheefficiencyofoperationofallcountriesroutingtraffictothatcountry.1.4CallcompletionratioinformationcanbeprovidedeitherinternallyinanSPCinternational

8、switchingcentreorexternallyattheleveloftheoutgoinginternationalcircuitsinanyinternationalswitchingcentreinwhichaccesstothecircuitsisprovidedforthepurposeofestablishingthedispositionofcallattempts.1.5Theavailability,flexibilityandcapacit