cnp3-ebook

protocols/ethernet

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Ethernet was designed in the 1970s at the Palo Alto Research Center [Metcalfe1976]_. The first prototype [#fethernethistory]_ used a coaxial cable as the shared medium and 3 Mbps of bandwidth. Ethernet was improved during the late 1970s and in the 1980s, Digital Equipment, Intel and Xerox published the first official Ethernet specification [DIX]_. This specification defines several important parameters for Ethernet networks. The first decision was to standardize the commercial Ethernet at 10 Mbps. The second decision was the duration of the `slot time`. In Ethernet, a long `slot time` enables networks to span a long distance but forces the host to use a larger minimum frame size. The compromise was a `slot time` of 51.2 microseconds, which corresponds to a minimum frame size of 64 bytes.

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