Analysis of an integrated services token-controlled ring network

An integrated services ring which allows voice and data traffic to coexist in harmony is analyzed. An analytical model is developed to evaluate the average data under various voice and data traffic loads, and the results were verified by simulation. The data message delay for this ring network is smaller than that of the other integrated services ring protocols, and the voice packet loss probability in this network is essentially zero over a wide range of data and voice traffic loads. Urgent messages can be transmitted with a higher priority over voice, a feature that is not available in other integrated voice/data networks. Since the voice packet delay is bounded within one packetization period, no time-stamping is needed and the voice loss can be completely avoided by reserving a sufficient number of slots. Continual speech reception is possible by synchronizing the speech generation process to the end of each frame. Since the ring is synchronized, gateway switching to external circuit-switched and packet-switched networks would be very simple