Token Ring Local Area Networks

Abstract The token ring access protocol evolved through a series of university and corporate research projects, followed by several international standards activities beginning in the 1970s and continuing for two decades into the 1990s. The token access protocol with a ring topology was the basis for both the IEEE 802.5 Token Ring and the ANSI X3T9.5 FDDI standards in the 1980s. This article focuses on the IEEE 802.5 protocol and operation with some comparisons with FDDI in specific areas. Several factors that distinguish token ring operation from other LAN protocols, such as fault detection, fault isolation, priority access protocol, and ring performance are discussed in depth. Introduction Brief History of Ring Networks Token Ring Technology Token Ring Access Protocol, Monitoring, and Recovery Multi‐Ring Networks Dedicated (“Switched”) Token Rings Fddi Token Protocol Lan Evolution Conclusion