Packet video transmission over a broadband implicit token passing LAN

Presents a quantitative approach to the design of packet video transport systems for shared-access, broadband media. The proposed methodology is illustrated by focusing on the problem of supporting a high quality multipoint-to-multipoint compressed video service using a 200 Mb/s implicit token passing (ITP) fiber optic LAN (local area network). The authors develop accurate simulation models, driven by realistic broadcast-quality AST-DPCM (adaptive spatio-temporal differential pulse code modulation) compressed video sources, for the example ITP-LAN system. The models developed are used to determine design tradeoffs among channel throughput, video quality, and the transport level and media access level protocol features and parameters implemented in the packet video network interface unit. It is shown that with appropriate transport and channel access protocols, high efficiency of channel use can be achieved with reasonable buffering requirements, without the use of adaptive coding strategies