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A thicknet MAU. The vampire tap on this specimen is still attached to a piece of "frozen yellow garden hose" 10BASE5 network cable, which has been cut. A thinnet MAU, showing a single BNC and a DA15 connector. Two Medium Attachment Units (MAUs). The units shown are backwards compatibility-oriented 10BASET MAUs, not older 10BASE5 or 10BASE2 MAUs.
The first Ethernet standard, known as 10BASE5 (ThickNet) in the family of IEEE 802.3, specified baseband operation over 50 ohm coaxial cable, which remained the principal medium into the 1980s, when 10BASE2 (ThinNet) coax replaced it in deployments in the 1980s; both being replaced in the 1990s when thinner, cheaper twisted pair cabling came to dominate the market.
10BASE2 (also known as cheapernet, [1] thin Ethernet, thinnet, and thinwire) is a variant of Ethernet that uses thin coaxial cable terminated with BNC connectors to build a local area network. During the mid to late 1980s, this was the dominant 10 Mbit/s Ethernet standard.
Through the first half of the 1980s, Ethernet's 10BASE5 implementation used a coaxial cable 0.375 inches (9.5 mm) in diameter, later called thick Ethernet or thicknet. Its successor, 10BASE2, called thin Ethernet or thinnet, used the RG-58 coaxial cable. The emphasis was on making installation of the cable easier and less costly.
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10BASE5 (also known as thick Ethernet or thicknet) was the first commercially available variant of Ethernet. The technology was standardized in 1982 [ 1 ] as IEEE 802.3 . 10BASE5 uses a thick and stiff coaxial cable [ 2 ] up to 500 meters (1,600 ft) in length.
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