ITU E.845:1988
ITU E.845:1988 Connection Accessibility Objective For The International Telephone Service
Table of Contents
IntroductionPreamble
1Measureofconnectionaccessibility
2Objectiveforconnectionaccessibility
3Allocationoftheoverallobjectivetothenational
systemsandinternationalchain
ANNEXA-Methodforselectingtherequiredcallsample
size,N
ANNEXB-Methodforrelatingoverallnetworkconnection
failureprobabilitytothereliabilityandavailability
ANNEXC-Effectsofbusyhoursandnon-busyhoursonthenetwork
connectionfailure
C.1Influencesoffaults
C.2RelationshipbetweenNCF,congestionandfault
C.3Long-termNCF(averagedthroughoutayear)
C.4NCFandbusyhourpattern