Abstract
When multimedia informations traverse over packet switched networks, they experience impairments that may lead to degradation in the required Quality of Service (QoS).
The need for synchronization between audio and video became necessary for multimedia applications, mainly in a distributed environment. Four sources of asynchrony can disrupt synchronization : delay jitter, local clock drift, different initial collection times and different initial playback times. In this paper, we present a tele-teaching application experiment and simulation results, over TCP/IP with LAN Emulation (LANE) and native ATM networks, performances. We show that the multimedia synchronization is respected. Simulations prove that ATM with its possibilities for high bandwidth and bounded delay, is ideally suited as a technology capable of supporting video services and guarantee their QoS. The use of MPEG-4 video coding allows a low bandwidth. This is suitable for IP but not necessarily for ATM network. Therefore, in order to allow interoperability of the tele-teaching application over IP and ATM networks we chose MPEG-4 technique.