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10BASE5
10BASE5 (also known as thick ethernet or thicknet) was the original commercially available variant of Ethernet.
For its physical layer it used cable similar to RG-8/U coaxial cable but with extra braided shielding. This is a stiff, diameter cable with an impedance of 50 ohms (Ω), a solid center conductor, a foam insulating filler, a shielding braid, and an outer jacket. The outer sheath was often yellow-to-orange/brown foam fluorinated ethylene propylene (for fire resistance) so it often is called "yellow cable", "orange hose", or sometimes humorously "frozen yellow garden hose".〔''All-in-One Network+ Certification Exam Guide'', Mike Meyers, 3rd Ed., McGraw-Hill, 2004, p. 79.〕
10BASE5 has been superseded by much cheaper more convenient alternatives: first by 10BASE2 based on a thinner coaxial cable, and then once Ethernet over twisted pair was developed, by 10BASE-T and its successors 100BASE-TX and 1000BASE-T.
==Name origination==
The name ''10BASE5'' is derived from several characteristics of the physical medium. The ''10'' refers to its transmission speed of 10 Mbit/s. The ''BASE'' is short for baseband signalling as opposed to broadband, and the ''5'' stands for the maximum segment length of .
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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