Mechanical chassis 1U to 5U procurement standards
A rack unit (abbreviated U or RU) is a unit of measure defined as 1+3⁄4 inches (44. It is most frequently used as a measurement of the overall height of, as well as the height of equipment that mounts in these frames, whereby the height of the frame or equipment is expressed as multiples of rack units. For example, a typical full-size rack cage is 42U high, while equipment is typically 1.
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