Rack-Mount Standard Equipment designed to be placed in a rack is typically described as rack-mount, rack-mount instrument, a rack mounted system, a rack mount chassis, subrack, rack mountable, or occasionally simply shelf. The height of the electronic modules is also standardized as multiples of 1.75 inches (44.45 mm), one rack unit or "U".
The 19-inch (480 mm) standard rack arrangement is widely used throughout the telecommunication, computing, audio, entertainment and other industries.
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