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10base2
10BASE2 (also known as ''cheapernet'', ''thin Ethernet'', ''thinnet'', and ''thinwire'') is a variant of Ethernet that uses thin coaxial cable (RG-58A/U or similar, as opposed to the thicker RG-8 cable used in 10BASE5 networks), terminated with BNC connectors. During the mid to late 1980s this was the dominant 10 Mbit/s Ethernet standard, but due to the immense demand for high speed networking, the low cost of Category 5 Ethernet cable, and the popularity of 802.11 wireless networks, both 10BASE2 and 10BASE5 have become increasingly obsolete, though they still exist in some locations.
==Name origination==
The name ''10BASE2'' is derived from several characteristics of the physical medium. The ''10'' comes from the maximum transmission speed of 10 Mbit/s (millions of bits per second). The ''BASE'' stands for baseband signalling, and the ''2'' supposedly refers to the maximum segment length of 200 meters, though in practical use it can only run up to 185 meters. (The IEEE rounded 185 up to 200 to come up with the name 10BASE2, for consistency with the general standard).
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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