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Service level



TheabovecontentisreviewedandannouncedbytheNationalScienceandTechnologyTermReviewCommittee

Definition

ClassofService(CoS)networkisthenetworkAtechniqueormethodusedtodeliverqualityofservice(QOS).Specifically,CoSisamethodofclassifyingandprioritizingdatapacketsbasedonapplicationtype(voice,video,email,filetransfer,transactionprocessing,etc.),usertype(VIPorordinaryuser)orotherclassificationmethods,etc.."First-level"priorityflagsareassignedtodataapplications—suchasmission-criticaldatatransactions,orvideoorvoicetransmissions—thatchangequickly,andlow-priorityflagsareassignedtotime-sensitive,lesstime-sensitivetraffic,suchasE-mailandWebsurf.

Thedivisionofcommunicationqualitybasedontheprobabilityofacallbeingblockedordelayedformorethanacertaintime.Itisthecriterionofwhetheritisanincomingcallwhenitisbusy.

Relatedconcepts

Calllossrate

Service level

Whenmultiplechannelsareshared,becausethenumberofusersisgreaterthanthenumberofchannels,itmayhappenthatmanyusersrequesttotalkatthesametimebutthenumberofchannelscannotIftherequirementsaremet,onlyapartoftheuserscanbeallowedtotalkatthistime,andtheotherpartoftheuserscannottalk,untilthereisafreechannel,andthenlettheuserswhoneedtotalk.Therefore,althoughsomeusersmadeacall,butfailedtocompletethecallbecausethereisnochannel,thisiscalledacallfailure,thatis,a"callloss"occurs.

Fromtheperspectiveofachannel,evenifitcommunicatesuninterruptedlywithinanhour,theamountoftrafficitcancompleteisonly1Ireland.Sinceusersinitiatecallsatrandom,itisimpossibletousethechanneluninterruptedly,sotheactualvolumeoftrafficthatcanbecompletedbyachannelmustbelessthan1Ireland.Thismeansthatchannelutilizationcannotreach100%.Inthecaseofsharedchannels,itisdifficultforthecommunicationnetworktoensurethatallcallsofeachuseraresuccessful,andasmallamountofcallfailureswillbecalled"callloss".

Calculation

Servicequalityisanexpectationthatcustomerscanexperiencewhenmakingaphonecall.Inaloss-basedsystem,thequalityofserviceisdescribedastheratiooflossduringbusyhours.Foraninvalidcallsystem,thequalityofservicecanbecalculatedusingFormula1.

Foradelayedcallsystem,thequalityofserviceismeasuredbythefollowingthreepoints:

·1)Averagedelay-describestheaveragetimetheuser'srequestisdelayedwhilewaitingforaconnection.

·2)Averagedelay-Describetheaveragetimetheuserspendswaitingforaconnectionregardlessofwhetherthecallisdelayedornot.

·3)Theprobabilitythatausermaybedelayedlongerthantimetwhilestillwaitingforconnection.Thetimetisselectedbythetelecommunicationserviceproviderinordertomeasurewhethertheirservicemeetsthelevel.

Application

Servicelevelisasignoftheservicequalityoftelecommunicationsenterprises,animportantbasisfortheresearchdepartmenttodeterminethegroupstructureofswitchingequipment,andanimportantindicatorforthedesigndepartmenttomeasurethequalityoftelecommunicationsnetworkdesign.Thedeterminedservicelevelishigh,whichwillcauseawasteoffunds;whilealowlevelwillreducethequalityoftelecommunicationsservices.

Differenttelecommunicationsapplicationsrequiredifferentqualityofservice.Forexample,ifatelecommunicationsserviceproviderdecidestoprovidedifferentqualitiesfordifferentvoiceconnections,thenahigh-qualityvoiceconnectionwillhaveabetterconnectionqualitythananormalvoiceconnection.Inthisway,differentusesdeterminedifferentservicequality.Tohelptelecommunicationsserviceprovidersmarkettheirdifferentservices,eachserviceisplacedintoaspecificcategory.Eachserviceleveldeterminestherequiredservicelevel.

Accordingtothesurveyandresearchonthesametelephoneinthecity,thetotalcalllossis2to5%.Howtoallocatethetotalcalllosstoeachselectionlevelrequiresatechnicalandeconomiccomparison.Generally,thesensitivepartoftheuserisallocatedwithasmallercallloss.Forexample,thecalllossofstep-by-stepsystemandcrossbarsystemissetat0.5%whentheuserpicksupthephoneandlistenstothedialtone.Theselect-leveloutgoinglineisconnectedtotheinterofficetrunkline,andthelineinvestmentisrelativelylarge.Generally,itisallocatedto1%.Thecalllossrateatalllevelsofmycountry'slong-distanceautomaticnetworkbackboneroutingissetat1%.

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