A rack unit is a unit of measure used to describe the height of a server, network switch or other similar device mounted in a 19-inch rack or a 23-inch rack (refers to width of rack). Height is the measurement of vertical Distance, but has two meanings in common use A server is a Computer dedicated to providing one or more services over a computer network typically through a request-response routine A A 23-inch rack is used for housing Computer, Audio, Telephone and other equipment though is less common than the 19-inch rack. One rack unit is 44. 45 mm (1. The Millimetre ( American spelling: millimeter, symbol mm) is a unit of Length in the Metric system, equal to 75 in) high. Inches redirects here To see the Les Savy Fav album see Inches.
One rack unit is commonly designated as "1U"; similarly, 2 rack units are "2U" and so on. The size of a piece of rack mounted equipment is usually described as a number in "U". One rack unit is also sometimes referred to as "1RU"; most server racks have 42 U of height.
Professional audio and video gear often comes with rack mount options and use the same measurement specifications.
Half-rack units typically describe units that fit in a certain number of rack units, but occupy only half the width of the rack (9. 5 inches or 241 mm). For example, a "4U half-rack" DVCAM deck would occupy 4U (4 × 1. Digital Video (DV is a Digital video format created by Sony JVC Panasonic and other video camera procuers and launched in 1995 and in its smaller tape Form factor 75 inches) height × 9. 5 inches width. In theory, two half-rack decks could occupy the 4U space.
A front panel or filler panel in a rack is not an exact multiple of 1. 75-inches (44. 45 mm). To allow space between adjacent rack mounted components, a panel is 1⁄32 inch (0. 031 inch or 0. 79 mm) less in height than the full number of rack units would imply. Thus, a 1U front panel would be 1. 719 inches (43. 66 mm) high. If n is number of rack units, the formula for panel height is h = (1. 750n − 0. 031) inch = (44. 45n − 0. 79) mm.
Coincidentally, a rack unit is equal to a vershok, which is an obsolete Russian length unit. A native system of weights and measures was used in Imperial Russia and after the Russian Revolution, but it was abandoned in 1924 when the Soviet Union adopted the
The rack unit size is based on a standard rack specification as defined in EIA-310. The Electronic Industries Alliance (EIA until 1997 Electronic Industries Association) is a Trade organization composed as an alliance of trade associations for electronics
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