CCITTE.524(111988)(英)Overflowapproximationsfornon-randominputs.pdf

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1、INTERNATIONALTELECOMMUNICATIONUNIONCCITTE.524THEINTERNATIONAL(11/1988)TELEGRAPHANDTELEPHONECONSULTATIVECOMMITTEESERIESE:OVERALLNETWORKOPERATION,TELEPHONESERVICE,SERVICEOPERATIONANDHUMANFACTORSTrafficengineering–Determinationofthenumberofcircuitsinautomaticandsemi-automaticoperationOVERFLOW

2、APPROXIMATIONSFORNON-RANDOMINPUTSReeditionofCCITTRecommendationE.524publishedintheBlueBook,FascicleII.3(1988)NOTES1CCITTRecommendationE.524waspublishedinFascicleII.3oftheBlueBook.ThisfileisanextractfromtheBlueBook.WhilethepresentationandlayoutofthetextmightbeslightlydifferentfromtheBlueBoo

3、kversion,thecontentsofthefileareidenticaltotheBlueBookversionandcopyrightconditionsremainunchanged(seebelow).2InthisRecommendation,theexpression“Administration”isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.©ITU1988,2007Allrightsreserved.Nop

4、artofthispublicationmaybereproduced,byanymeanswhatsoever,withoutthepriorwrittenpermissionofITU.RecommendationE.524OVERFLOWAPPROXIMATIONSFORNON-RANDOMINPUTS1IntroductionThisRecommendationintroducesapproximatemethodsforthecalculationofblockingprobabilitiesforindividualtrafficstreamsinacircui

5、tgrouparrangement.ItisbasedoncontributionssubmittedintheStudyPeriod1984-1988andisexpectedtobeamendedandexpandedinthefuture(byaddingthelatestdevelopmentsofmethods).TheconsideredmethodsarenecessarycomplementstothoseincludedintheexistingRecommendationE.521whenitisrequiredtotakeintoaccountconc

6、eptssuchasclusterengineeringwithserviceequalization,serviceprotectionandend-to-endgradeofservice.RecommendationE.521istheninsufficientasitisconcernedwiththegradeofserviceforonlyonenon-randomtrafficstreaminacircuitgroup.Designmethodsconcerningtheabove-mentionedareasaresubjecttofurtherstudya

7、ndthisRecommendationwillserveasareferencewhen,inthefuture,RecommendationE.521iscomplementedorreplaced.InthisRecommendationtheproposedmethodsareevaluatedintermsofaccuracy,processingtime,memoryrequirementsandprogrammingeffort.Othercriteriamayberelevantandaddedin