Token Ring

Token Ring was originally developed by IBM in the 1970s to provide a transaction-oriented communications protocol for its Systems Network Architecture (SNA) protocols, which were used to provide data communication services for its mainframe computers. When IBM introduced its PC product in 1981, it provided no networking solution, because IBM had envisioned the PC primarily as consumer product or as a front-end device for its larger computing systems, which would communicate serially with its mainframe systems. In 1984, in response to Ethernet, IBM released a 4Mbps version of Token Ring to provide LAN transmission services to its PCs that would be compatible with its existing networking architecture technologies. 4Mbps Token Ring uses ...

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