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2. Rack unit - Wikipedia

   en.wikipedia.org/wiki/Rack_unit

   Rack with sample component sizes including an A/V half-rack unit. A rack unit (abbreviated U or RU) is a unit of measure defined as 1 + 3 ⁄ 4 inches (44.45 mm). [1] [2] It is most frequently used as a measurement of the overall height of 19-inch and 23-inch rack frames, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed ...

3. 19-inch rack - Wikipedia

   en.wikipedia.org/wiki/19-inch_rack

   A 23-inch (580 mm) rack is used for housing telephone (primarily), computer, audio, and other equipment though is less common than the 19-inch rack. The size denotes the width of the faceplate for the installed equipment. The rack unit is a measure of vertical spacing and is common to both the 19 and 23-inch racks.

4. Rack rail - Wikipedia

   en.wikipedia.org/wiki/Rack_rail

   The height of rack rail is determined by the number of rack units required for mounting the equipment. The design of racks and rack rails is specified in ECIA - EIA/ECA-310. Each rack unit (U) is equivalent to 1 + 3 ⁄ 4 in (44 mm). Most rack rail is in sizes from 2 units high (3 + 1 ⁄ 2 in or 89 mm) to 54 units high (78 + 3 ⁄ 4 in or ...

5. File:Server rack rail dimensions.svg - Wikipedia

   en.wikipedia.org/wiki/File:Server_rack_rail...

   Date/Time Thumbnail Dimensions User Comment; current: 00:32, 6 August 2007: 318 × 609 (30 KB): Sakurambo~commonswiki {{Information |Description=A section of rail from a 19" server rack unit, showing how typical rack units 1U through 4U are distributed among the mounting holes. |Source=Own work, based on the public-domain image [[w:Image:Server-Rack-Rail-

6. Blade server - Wikipedia

   en.wikipedia.org/wiki/Blade_server

   In a standard server-rack configuration, one rack unit or 1U—19 inches (480 mm) wide and 1.75 inches (44 mm) tall—defines the minimum possible size of any equipment. The principal benefit and justification of blade computing relates to lifting this restriction so as to reduce size requirements.

7. Horizontal pitch - Wikipedia

   en.wikipedia.org/wiki/Horizontal_pitch

   Horizontal pitch (HP) is a unit of length defined by the Eurocard printed circuit board standard used to measure the horizontal width of rack mounted electronic equipment, similar to the rack unit (U) used to measure vertical heights of rack mounted equipment.

8. AOL Mail

   mail.aol.com

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9. Eurocard (printed circuit board) - Wikipedia

   en.wikipedia.org/wiki/Eurocard_(printed_circuit...

   As the cards are assumed to be installed in a vertical orientation, the usual meanings of height and width are transposed: A card might be 233.35 mm "high", but only 20 mm "wide". Height is measured in rack units, "U", with 1 U being 1.75 in (44.45 mm). This dimension refers to the subrack in which the card is to be mounted, rather than the ...