![]() ![]() By 1911, the term was also being used in railroad signaling.There is little evidence that the dimensions of these early racks were The term relay rack appeared first in the world of telephony. The industry standard rack cabinet is 42U tall. The height of the electronic modules is also standardized as multiples of 1.752 inches (44.50 mm) or one rack unit or U (less commonly RU). That protrude on each side which allow the module to be fastened to the rack frame with screws.Įquipment 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 The 19-inch dimension includes the edges, or "ears", Each module has a front panel that is 19 inches (48.3 cm) wide. Rack is standardized frame or enclosure for mounting multiple equipment modules. ![]()
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