A rack unit is a unit of measure used to describe the height of a server,
network switch or other similar device mounted
One rack unit is commonly designated as "1U"; similarly, 2 rack units are "2U"
and so on. The size of a piece of rack mounted equipment is usually described as
a number in "U". One rack unit is also sometimes referred to as "1RU"; most
server racks have 42 U of height.
Professional audio and video gear often comes with rack mount options and use
the same measurement specifications.
Half-rack units typically describe units that fit in a certain number of rack
units, but occupy only half the width of the rack A front panel or filler panel
in a rack is To allow space between adjacent rack mounted components
Coincidentally, a rack unit is equal to a vershok, which is an obsolete Russian
length unit.
A 19-inch rack is a standardized system for mounting various electronic modules in a "stack", or rack, 19 inches
(482.6 mm) wide. Equipment designed to be placed in a rack is typically
described as rack-mount, a rack mounted system, a rack mount chassis, subrack,
rack mountable, or occasionally, simply shelf. The slang expression for a
subrack is "pizza box" due to the
similarity in size and shape, see also pizza box form factor. Most racks are
sold in the 42U form: that is, a single rack capable of holding 42 1U pizza box
servers.
This standard rack arrangement is widely used
throughout the telecommunication, computing, audio, entertainment and other
industries, though the Western Electric 23-inch standard, with holes on 1-inch
centers, prevails in telecommunications.
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