evaluation of teleteaching services over atm and ip networks q

evaluation of teleteaching services over atm and ip networks q

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1、TelematicsandInformatics20(2003)1–18www.elsevier.com/locate/teleEvaluationofteleteachingservicesoverqATMandIPnetworksCh.Bouras*,A.Gkamas,V.Kapoulas,Th.TsiatsosComputerTechnologyInstitute,Greece,RigaFeraiou61,GR-26221Patras,GreeceComputerEngineeringandInformaticsDepar

2、tment,UniversityofPatras,Greece,RigaFeraiou61,GR-26221Patras,GreeceAbstractThispaperpresentsthecomponentsofasynchronousteleteachingapplication,theirun-derlyingtechnologyandtheirinteractionwithnetworkservices.Inaddition,itpresentsthearchitectureanddesignofasynchronous

3、teleteachingapplicationusedoverthepublicATMnetworkinGreece.ThispaperpresentsvariousteleteachingscenariosoveranATMnetworkinfrastructurewiththeuseofnativeATMandIPoverATM.Ineachscenariowepresentthestandardsused,thelogicalcomponents,theresourcedemands(networkandequipment

4、)anditsspecialcharacteristics.Foreachscenariowegivedetailedinformationaboutthetrans-missionandframeratesandthevideodelay.Themainresultofourexperimentsisthatbroadbandnetworkso?ermanycapabilitiesforhighqualityteleteaching,andgenerallyspeaking,highqualitytelematicservic

5、es.ó2002ElsevierScienceLtd.Allrightsreserved.Keywords:Teleteachingscenarios;ATM;Broadbandnetworks;Teleteachingevaluation1.IntroductionIntherecentyears,bothcomputerandcommunicationcompanieshavemadegreate?ortstoincludemultimediacapabilitiesinworkstationanddesktopsystem

6、s.Multimediateleconferencingsystemshavethusbecomewidelyaccepted,becauseqAshorterversionofthispaperhasbeenpresentedinATMTU-200conference.SupportedinpartbytheGreekSecretariatforResearchandTechnologyundertheprojectATMnet/EPETII.*Correspondingauthor.Tel.:+30-61-960375;fa

7、x:+30-61-996314.E-mailaddresses:bouras@cti.gr(Ch.Bouras),gkamas@cti.gr(A.Gkamas),kapoulas@cti.gr(V.Kapoulas),tsiatsos@cti.gr(Th.Tsiatsos).0736-5853/02/$-seefrontmatteró2002ElsevierScienceLtd.Allrightsreserved.PII:S0736-5853(01)00026-02Ch.Bourasetal./TelematicsandInfo

8、rmatics20(2003)1–18theycansupportapplicationssuchascollaborativeapplicationsorteleteaching(Bourasetal.,2000a,b).Thereisagrowingpubl

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