A dual-ring LAN for integrated voice/video/data services

A media access control (MAC) protocol for integrated services on a dual-ring high-speed LAN is proposed. The protocol supports real-time synchronous voice and video services and multilevel priority asynchronous data traffic types using a packet-switched operation. The most important service requirement for packetized real-time traffic is guaranteed periodic access to the network with a small delay variation. The requirement is met by periodic generation of synchronous service tokens. The effect of service interruptions due to the synchronous traffic, i.e. voice and video, on the asynchronous data traffic is investigated by means of analytical and simulation methods.<
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