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A local area network first described by Metcalfe & Boggs of Xerox PARC in 1976. Also known as IEEE 802.3 Data is broken into frames and each one is transmitted using the CSMA/CD algorithm until it arrives at the destination without colliding with any other packet. A station is either transmitting or receiving or idle at any instant. Newer equipment supports full-duplex, where a station can transmit acknowledgments without halting a receive. Full duplex requires a switch with support, rather than a hub. The bandwidth is from 10 Mbit/s (ethernet) to 100 Mbit/s (fast ethernet) to 1000 Mbit/s (gigabit ethernet.) There is work being done currently (2002) to support 10 Gbit/sec ethernet. Ethernet cables are classified as "XbaseY", e.g. 10base5, where X is the data rate in Mbps, "base" means "baseband" (as opposed to radio frequency) and Y is the category of cabling. The original cable was 10base5 ("full spec"), others are [10Base2] and [10BaseT] which is now (2002) dissappearing. [100BaseT] is the desktop standard, and [1000BaseT] is quite reasonable for servers. Ethernet is at LAYER TWO - DATA LINK LAYER of the OSI model. See Also * [10Base2] * [10BaseT] * [100BaseT] * [1000BaseT] * [CSMA/CD] * [OSIModel] * [XeroxPARC]
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