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For rack mounted computer servers, devices generally intake air on the front and exhaust on the rear. George, Chassis Slide MechanismU.
Category:DIN – Wikimedia Commons
The cases typically use extruded aluminum bands at the ends of the body with tongue-and-groove mating to like bands for the covers. Four-post racks allow for mounting rails to support the equipment at the front and rear. To protect equipment from shock and vibration dn rack cases use an inner and outer case.
Common uses include server, telecom, broadcast video, lighting, audio, and scientific lab equipment. This page was last edited on 12 Decemberat Views Read Edit View history.
Bell Labs Technical Journal. Production of clearance-hole racks is less expensive because tapping the holes is eliminated and replaced with fewer, less expensive, cage nuts.
This of course varies by manufacturer, the design of the rack and its purpose, but through common constraining factors such as raised floor tile dimensionsthese 14494 have become quite common. The height of the electronic modules is also standardized as multiples of 1. Examples include telephone exchanges, network cabling panels, broadcast studios and some government and military applications. Physical Protection, are available,  with Zone 4 representing the most demanding environment.
The fans themselves can be difficult to replace. A key structural weakness of front-mounted support is the shear stress placed on the mounting rails and the leading edge of the equipment.
The height of the different panels will vary, They allow for dense hardware configurations without occupying excessive floorspace or requiring shelving. A difficulty with forced air cin cooling in rack equipment is that fans can fail due to age or dust. The holes in the ddin are arranged vertically in repeating sets of three, with center-to-center separations of 0. Holes so arranged can either be tapped usually UNF thread, or, less often, 6mm metric or have square holes for cage nuts.
Raised or false floor cooling in server rooms can serve a similar purpose; they permit cooling airflow to equipment through the underfloor space to the underside of enclosed rack cabinets. The strength required of the mounting posts means they are invariably not merely flat strips but actually a wider folded strip arranged around the corner of the rack. Newer server rack cabinets come cin adjustable mounting rails allowing the user to place the rails at a shorter depth if needed.
This gap allows a bit of room above and below an installed piece of 4494 so it may be removed without binding on the adjacent equipment.
Rack-mountable equipment is usually designed to occupy some integer number of U. Touring musicians, theatrical productions and sound and light companies use road case racks. Square-hole racks allow boltless mounting, such that the rack-mount equipment only needs to insert through and hook down into the lip of the square hole.
inch rack – Wikipedia
Racks are divided into regions, These aisles may themselves be enclosed into a cold air containment tunnel so that cooling air does not travel to other parts of the building where it is not needed or mixes with hot air, making it less efficient. When there is a large fin of computers in a single rack, it is impractical for each one to have its own separate keyboard, mouse, and monitor.
The gap between the posts is millimetres These djn are marketed to musicians and entertainers for equipment not subject to frequent transportation and rough handling. These posts are typically heavy gauge metal or extruded aluminum.
The height of a rack can vary from a few inches, such as in a broadcast console, to a floor mounted rack whose interior is 45 rack units See also Industrial PC. Racks carrying telecom equipment like routers and switches often have extra width to accommodate the many cables on the sides. Computer enclosure Mechanical standards Server hardware.
Slides or rails for computers and 14494 data processing equipment such as disk arrays rin routers often need to be purchased directly from the equipment manufacturer, as there is no standardization on such equipment’s thickness measurement from the side of the rack to the equipment or means for mounting to the rail. When rack rails are too thin to tap, rivnuts or other threaded inserts can be used, and when the particular class of equipment to be mounted is known in advance, some of the holes can be omitted from the mounting rails.
The size denotes the width of the faceplate for the installed equipment. The inch rack format with rack-units of 1.
A variety of airflow patterns can be found, including front intakes and rear exhausts, ein well as side intakes and exhausts. Originally, the mounting holes were tapped with a particular screw thread.
The term relay rack appeared first in the world of telephony. Occasionally, one may see fractional U devices such as a 1.