One rack unit is 1.75 inches (4.445 cm) high. The 19-inch (482.6 mm) or 23-inch (584.2 mm) dimension refers to the width of the equipment mounting frame in the rack including the frame the width of the equipment that can be mounted inside the rack is less. "A rack unit, U or RU is a unit of measure that describes the height of equipment designed to mount in a 19-inch rack or a 23-inch rack. Each module has a front panel that is 19 inches (482.6 mm) wide, including edges or ears that protrude on each side which allow the module to be fastened to the rack frame with screws." "A 19-inch rack is a standardized frame or enclosure for mounting multiple equipment modules. They are used for choosing the equipment or racks to buy, and help to organize equipment on the racks virtually, without the real installation. Server rack diagrams visualize the the rack mounting of computer and network equipment as the drawing of frontal view of the rack with equipment installed.
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