LYCOS RETRIEVER 
Ethernet: Ethernet Lan
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Ethernet is a family of frame-based computer networking technologies for local area networks (LANs). The name comes from the physical concept of the ether. It defines a number of wiring and signaling standards for the physical layer, through means of network access at the Media Access Control (MAC)/Data Link Layer, and a common addressing format.
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Ethernet is a standard for connecting computers into a local area network (LAN). The most common form of Ethernet is called 10BaseT, which denotes a peak transmission speed of 10 mbps using copper twisted-pair cable.
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Most textbook treatments of Ethernet would concentrate on Thicknet coax, because that is the wiring arrangement used when Xerox invented the LAN. Today this is still used for medium-long distances where medium levels of reliability are needed. Fiber goes farther and has greater reliability, but a higher cost. To connect a number of workstations within the same room, a light duty coax cable called "Thinnet" is commonly used. These other media reflect an older view of workstation computers in a laboratory environment.
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Ethernet (the name commonly used for IEEE 802.3 CSMA/CD) is the dominant cabling and low level data delivery technology used in local area networks (LANs). First developed in the 1970s, it was published as an open standard by DEC, Intel, and Xerox (or DIX), and later described as a formal standard by the IEEE. Following are some Ethernet features:
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Ethernet is standardized as IEEE 802.3. The combination of the twisted pair versions of Ethernet for connecting end systems to the network, along with the fiber optic versions for site backbones, is the most widespread wired LAN technology. It has been in use from the 1990s to the present, largely replacing competing LAN standards such as token ring, FDDI, and ARCNET. In recent years, Wi-Fi, the wireless LAN standardized by IEEE 802.11, is prevalent in home and small office networks and augmenting Ethernet in larger installations.
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One benefit of Ethernet extenders is they can eliminate the need for installing expensive Switches and CAT5 cable. Ethernet extenders can use fiber-optic or copper twisted-pair cables to transparently send packets at full-line rate to a peered LAN up to five miles away. While networks typically deploy Ethernet extenders within a limited geographical area, this area need not be limited to one building. Ethernet extenders can create effective bridged-Ethernet connections across streets or over a college or enterprise campus and between Ethernet LANs up to five miles apart.
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