19-inch chassis size 1u
45 mm) was established as a standard by AT&T around 1922 in order to reduce the space required for repeater and termination equipment in a telephone company central office. OverviewA 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 eq. A typical full-size rack is 42U, which means it holds just over 6 feet (180 cm) of equipment, and a typical "half-height" rack is 18U–22U, which is around 3 feet (91 cm) high.
Read More