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Local Area High Speed Networks by Dr. Sidnie Feit

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Chapter 19. Token Ring and FDDI Overview

IBM has been connecting systems across networks for a long time, and IBM networking always has had a distinctive personality. Much of its early focus was on data entry and data display at remote terminals. IBM equipment was (and still is) used in banks and government offices, and the most important design criterion always has been predictable response time.

The free and easy—and unpredictable—Ethernet LAN environment did not match this requirement. IBM started working on a more controllable LAN technology—Token Ring—in the 1970s. A 4Mbps Token Ring specification was completed in the early 1980s, was submitted to the IEEE for standardization, and was ratified by 1985. Operation at 16Mbps was standardized ...

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