Protocol Architecture for Multimedia Applications over ATM Networks Dilip D. Kandlur* Debanjan Saha t M. Willebeek-LeMair* Abstract At the data-link layer, ATM offers a number of features, such as high-bandwidth and per-connection quality of service (QoS) guarantees, making it particularly attractive to multimedia applications. Unfortunately, many of these features are not visible to applications because of the inadequacies of existing higher-level protocol architectures. Although a considerable effort is underway to tune these protocols for ATM networks, we believe that a new ATM specific protocol stack is essential to effectively exploit all the benefits of ATM. In this paper we describe the semantics of such a protocol stack, and discuss its advantages over traditional protocol architectures from the perspective of distributed multimedia applications. The performance impact of the new protocol architecture is experimentally demonstrated on a video conferencing testbed built around IBM RS/6000s equipped with prototype hardware for video/audio processing, and connected via ATM links. *IBM Thomas J. Watson Research Center, Yorktown Heights, NY 10598, USA. tDepartment of Computer Science, University of Maryland, College Park, MD 20742. ACM SIGCOMM -33- Computer Communication Review Introduction At the data-link layer, ATM offers a number of features, such as high-bandwidth and perconnection
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