ITU-T F.24(11-1988) (英) Average grade of service from……

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1、INTERNATIONALTELECOMMUNICATIONUNION)45 4&TELECOMMUNICATIONSTANDARDIZATIONSECTOROFITU/0%2!4)/.3!.$15!,)49/&3%26)#%4%,%'2!0(3%26)#%3!6%2!'%'2!$%/&3%26)#%&2/-#/5.4294/#/5.429).4(%'%.4%83%26)#%)45 4Recommendation&(Extractfromthe"LUE"OOK)NOTES1ITU-T

2、RecommendationF.24waspublishedinFascicleII.4oftheBlueBook.ThisfileisanextractfromtheBlueBook.WhilethepresentationandlayoutofthetextmightbeslightlydifferentfromtheBlueBookversion,thecontentsofthefileareidenticaltotheBlueBookversionandcopyrightconditionsremainunchanged(seebelow).2Inth

3、isRecommendation,theexpression“Administration”isusedforconcisenesstoindicatebothatelecommunicationadministrationandarecognizedoperatingagency.ãITU1988,1993Allrightsreserved.Nopartofthispublicationmaybereproducedorutilizedinanyformorbyanymeans,electronicormechanical,includingphotocop

4、yingandmicrofilm,withoutpermissioninwritingfromtheITU.RecommendationF.24FascicleII.4-Rec.F.24AVERAGEGRADEOFSERVICEFROMCOUNTRYTOCOUNTRYINTHEGENTEXSERVICETheCCITT,considering(a)thatRecommendationF.23givesarecommendedgradeofserviceforgroupsoflong-distanceinternationalcircuitsusedintheg

5、entexservicebut;(b)thatitwouldbehelpfulforoutgoingcountriestobecertainthatthegentexcallscanbeputthroughwithalossprobabilitysufficienttomaintainthegradeofgentexservicewithoutdelayworking;(c)thatsmallofficesconnectedtothegentexnetworkcannotensure,attheincomingend,averyhighgradeofservi

6、ce,otherwisetheirequipmentwouldbeuneconomicallyused;(d)thatitissufficientforanoutgoingcountrytobeabletocountonanaveragegradeofserviceforallgentexcallstoagivenincomingcountry,unanimouslydeclares(1)thatitishelpfultodefineanaveragegradeofservicebetweencountriesforgentexcalls;(2)thatthi

7、sgradeofserviceshouldbeexpressedastheproportionofcallsthatreachtheincomingcountryparticipatinginthegentexservice,butthatfailtogetthroughtoitsgentexstations;and(3)thatthisgradeofserviceshouldnotinvolvemorethananaverageof1lostcallin10duringthebusyhouronanormalday.Callsroutedtoanoverfl

8、owpositionareconsid