7: Multimedia Networking7-1Chapter 7Multimedia NetworkingA note on the use of these ppt slides:We’re making these slides freely available to all (faculty, students, readers).They’re in PowerPoint form so you can add, modify, and delete slides(including this one) and slide content to suit your needs. They obviouslyrepresent alotof work on our part. In return for use, we only ask thefollowing:qIf you use these slides (e.g., in a class) in substantially unaltered form,that you mention their source (after all, we’d like people to use our book!)qIf you post any slides in substantially unaltered form on a www site, thatyou note that they are adapted from (or perhaps identical to) our slides, andnote our copyright of this material.Thanks and enjoy!JFK / KWRAll material copyright 1996-2009J.F Kurose and K.W. Ross, All Rights ReservedComputer Networking: A TopDown Approach5thedition.Jim Kurose, Keith RossAddison-Wesley, April 2009.
7: Multimedia Networking7-2Multimedia and Quality of Service: What is it?اﻟوﺳﺎﺋطاﻟﻣﺗﻌددةوﺟودةاﻟﺧدﻣﺔﻣﺎھﻲmultimedia applications:network audio and video(“continuous media”)ﺗطﺑﯾﻘﺎتاﻟوﺳﺎﺋطاﻟﻣﺗﻌددة:ﺷﺑﻛﺔاﻟﺻوتواﻟﻔﯾدﯾو)"اﻟوﺳﺎﺋطاﻟﻣﺳﺗﻣرة"(network provides applicationwithlevel of performanceneeded for application tofunction.ﺗوﻓراﻟﺷﺑﻛﺔﻟﻠﺗطﺑﯾقﻣﺳﺗوىﻣناﻷداءاﻟﻼزمﻟﻠﺗطﺑﯾق.QoS (quality of service)
7: Multimedia Networking7-3Chapter 7: goalsPrinciplesrclassify multimedia applicationsridentify network services applications needrmaking the best of best effort serviceProtocols and Architecturesrspecific protocols for best-effortrmechanisms for providing QoSrarchitectures for QoS
7: Multimedia Networking7-4Chapter 7 outline7.1 multimedia networkingapplications7.2streaming stored audioand video7.3making the best out ofbest effort service7.4protocols for real-timeinteractive applicationsRTP,RTCP,SIP7.5providing multipleclasses of service7.6providing QoSguarantees
7: Multimedia Networking7-5MM Networking ApplicationsFundamental characteristics:اﻟﺧﺻﺎﺋصاﻷﺳﺎﺳﯾﺔ:rtypicallydelay sensitiveﺣﺳﺎسﻟﻠﺗﺎﺧﯾرmend-to-end delaymdelay jitterﺗﺄﺧﯾرﻣﺗﻐﯾرrloss tolerant: infrequentlosses cause minorglitchesrﻧﺳباﻟﺳﻣﺎحﻟﻠﻔﻘد:ﺗﺗﺳﺑباﻟﻔﻘداﻟﻣﺗﻛررﻓﻲﺣدوثﺑﻌضاﻷﺧطﺎءrantithesis of data, whichare lossintolerantbutdelaytolerant.ﻋﻛساﻟﺑﯾﺎﻧﺎت،واﻟﺗﻲھﻲﻓﻘداناﻟﺗﻌﺻبوﻟﻛناﻟﺗﺳﺎﻣﺢفاﻟﺗﺎﺧﯾر.Classes of MM applications:ﻓﺋﺎتﺗطﺑﯾﻘﺎتاﻟوﺳﺎﺋطاﻟﻣﺗﻌددة:1) stored streamingﺗﺧزﯾناﻟﺗدﻓق2) live streamingﺑثﻣﺑﺎﺷر3) interactive, real-timeاﻟﺗﻔﺎﻋﻠﯾﺔ،ﻓﻲاﻟوﻗتاﻟﺣﻘﯾﻘﻲJitteris the variabilityof packet delays withinthe same packet streamاﺧﺗﻼفﺗﺄﺧﯾراتﺣزماﻟﺑﯾﺎﻧﺎتداﺧلﻧﻔسﺗدﻓقﺣزماﻟﺑﯾﺎﻧﺎت
7: Multimedia Networking7-6Streaming Stored MultimediaStored streaming:rmedia stored at sourceاﻟﻣﻠفﻣﺧزنﻋﻧداﻟﻣﺻدرr