计算机网络课件英文版Chapter7_Multimedia Networking.ppt

7: working 7-1 Chapter 7 working A 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 obviously represent a lot of work on our part. In return for use, we only ask the following: ? If you use these slides (., in a class) in substantially unaltered form, that you mention their source (after all, we ’ d like people to use our book!) ? If you post any slides in substantially unaltered form on a , that you note that they are adapted from (or perhaps identical to) our slides, and note our copyright of this material. Thanks and enjoy! JFK / KWR All material copyright 1996-2007 Kurose and . Ross, All Rights working: A Top Down Approach 4 th edition. Jim Kurose, Keith Ross Addison-Wesley, July 2007. 7: working 7-2 Multimedia and Quality of Service: What is it? multimedia applications: network audio and video (“ continuous media ”) network provides application with level of performance needed for application to function. QoS 7: working 7-3 Chapter 7: goals Principles r classify multimedia applications r work services applications need r making the best of best effort service Protocols and Architectures r specific protocols for best-effort r mechanisms for providing QoS r architectures for QoS 7: working 7-4 Chapter 7 outline working applications streaming stored audio and video making the best out of best effort service protocols for real-time interactive applications RTP,RTCP,SIP providing multiple classes of service providing QoS guarantees 7: working 7-5 working Applications Fundamental characteristics: r typically delay sensitive m end-to-end delay m delay jitter r loss tolerant : infrequent losses cause minor glitches r antithesis of data, which are loss intolerant but delay tolerant . Classes