Integrating video codecs in ATM networks

As the ATM technique matures several solutions have been proposed for the integration of video codecs in the broadband ISDN. At present, two approaches can be distinguished The first aims at the integration of video codecs, that were developedfor synchronous networks, in the ATM network For these codecs, adoptors are developed that provide the necessary circuit emulation over the ATM network, with the required quality. In the paper special attention is paid to synchronization, dejittering and cell loss protection issues. The second scenario is bared on a new generation of video codecs that a n being developed especially for the ATM network These codecs take full advantage of the flexibility offered by the ATM network, and allow cell loss concealment techniques to be used. In the paper Variable Bit Rate video coding and the associated bandwidrh allocation and policing algorithms are discussed. Special features such as user selectable picture quality are shown Cell loss detection and concealment techniques are discussed.