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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. Eurocard (printed circuit board) - Wikipedia

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

   Eurocard is an IEEE standard format for printed circuit board (PCB) cards that can be plugged together into a standard chassis which, in turn, can be mounted in a 19-inch rack. The chassis consists of a series of slotted card guides on the top and bottom, into which the cards are slid so they stand on end, like books on a shelf.

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. 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.

6. 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-

7. Talk:Rack unit - Wikipedia

   en.wikipedia.org/wiki/Talk:Rack_unit

   5.1 Front panel dimensions. The height increment of a front panel is 1U, equal to 44,45 mm. Thus is would seem that the actual value of the U unit is in fact 44.45 mm, NOT 44.50 mm as stated in the article. This makes a lot of sense, since the system is obviously based on Imperial units, and 1.75 inch is in fact 44.45 mm.

8. File:19" Server rack rail dimensions in mm.svg - Wikipedia

   en.wikipedia.org/wiki/File:19"_Server_rack_rail...

   English: A section of rail from a 19" server rack unit, showing how typical rack units 1U through 4U are distributed among the mounting holes. Dimensions in mm Dimensions in mm Date

9. List of PowerEdge servers - Wikipedia

   en.wikipedia.org/wiki/List_of_PowerEdge_servers

   The 19″ rack-servers come in different physical heights expressed in rack units or U. Most modern servers are either 1U or 2U high while in the past the 4U was more ...