The IEEE 802.5 Token Ring system has become a standard media access protocol (MAP) for interconnecting the nodes in a medium-speed Local Area Network (LAN). This essentially operates using a circulating token where a node captures the token in order to transmit it's packet; it then forwards the token to the next downstream node, The system provides priority operation with up to eight levels of priorities. This protocol requires a processing delay of one or more bits at each node thereby increasing the Ring Latency Time (RLT). This paper proposes a new Ring/Bus protocol to reduce this RLT for better performance. This is done by replacing the nodal delay of the Token Ring by a switching arrangement at each node, The proposed Ring/Bus system can also support multi-priority service. Analytical results on the performance of this new proposed scheme is presented along with some simulation results.
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