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Mounts & Brackets
The cabinet of a computer is a tall movable closet used to house multiple computers and computer equipment. The form of the modern cabinet is standardized by the Electronic Industries Alliance, so that equipment can be placed in any manufacturer's cabinet. The primary design criteria are: more...
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Access to equipment - various kinds of locks and latches restrict access.;
Airflow - Cabinets are designed to be placed side-to-side, so airflow is vertical, with vents and mounting brackets for fans.;
Mounting Brackets - Mounting brackets have mounting holes at standard spacings and are a standard distance apart, to allow a variety of equipment to be installed in several configurations.;
Grounding - The mounting brackets are conductive, acting as grounding strips for the cabinet and equipment, allowing the whole cabinet to be connected to the building ground.;
Cable Access - The bottom of the cabinet is usually open, allowing external cables to drop through a raised floor.;
Acoustic noise reduction is built into some cabinets; Electromagnetic shielding is built into others.
The most common type of modern cabinet is known as the "EIA standard" or "19-inch rackmount cabinet", where 19-inch refers to the approximate internal width of the cabinet, from mounting bracket to mounting bracket. "Rackmount" computer equipment is standardized to this width, with mounting holes conforming to the mounting bracket standard. The computer height is measured in U`s, where 1U is 1.75 inches. The standard height of a rack unit is also referred to as a "Rack Space," or "R.U." Rack equipment or the rack cabinet holding the equipment, can be various rack height sizes, starting at 1U (1.75") to 10U (17.50") and up. Racks are often 42 R.U. high, though some much larger and smaller are available. Small cabinets of 4 to 8 R.U. are often used in the music industry.
Cabinets and relay racks typically have 3 mounting holes for every 1RU. These holes are 0.5 inches, 0.5 inches, and 0.75 inches apart along the height of the rack. These holes are typically square (rapid rack) holes which equipment clips into or threaded round holes in either 10-32, 12-24, or M6 threading.
Read more at Wikipedia.org
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