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Evolution of the Ethernet Local 'Computer Network by John F. Shoch, Yogen K. Dalal, Ronald C. Crane, and David D. Redell Evolution of the Ethernet Local Computer Network by John F. Shoch, Vogen K. Dalal, Ronald C. Crane 1 , and David D. Redell OPD-T8102 September 1981 Abstract: The Ethernet system is a local computer network that supports high-speed packet switching in a locally distributed computing environment. This paper highlights some important elements of the basic system, and traces the evolution of the design from a research prototype to the specification of a multi-company standard. Starting from the Experimental Ethernet, we discuss tradeoffs among alternative implementations and design strategies which led to the Ethernet Specification. A concise summary of the Ethernet Specification is also included. CR Categories: 3.81. Key words and phrases: Local computer networks, Ethernet system, carrier sense multiple access with collision detection (CSMA/CD), communications standards. This paper is to appear in the IEEE Computer Magazine. , Present address: 3Com Corporation, 1390 Shorebird Way, Mountain View, California 94043.