Multimedia Teletutoring over a Trans-European ATM Network

. We describe the multimedia teletutoring application jointly developed by EPFL and Eurecom in the context of the first 34 Mbits/s TransEuropean ATM network interconnecting sites in France and Switzerland. This network was called the Broadband Exchange over Trans-European Links (BETEL). The aim of this paper is to describe the BETEL teletutoring platform and its building blocks, together with performance evaluation, limitations and future enhancements of this prototype. Focus is placed on the interactive audio and video communication part of the application. 1 Introduction The trend in today's telecommunication networks is a migration towards Broadband Integrated Service Digital Networks (B-ISDN) to support integrated high-speed data, voice and video communications. Asynchronous Transfer Mode (ATM) is the packet switching and multiplexing technique chosen for B-ISDN to provide services with different Quality of Service (QoS) requirements. Meanwhile, new video and audio coding standards..

Vers une vision systémique du processus de l'explication : récit d'une recherche sur l'intégration de la pédagogie, de l'ingénierie et de la modélisation

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