The 19-inch rack format has remained constant while the technology that is mounted within it has changed considerably and the set of fields to which racks are applied has greatly expanded. The standard rack arrangement is widely used throughout the telecommunications, computing, audio, video, entertainment and other industries, though the Western Electric 23-inch standard, with holes on centers, is still used in legacy ILEC/CLEC facilities.
tHe 19-inch rACK format Has remaineD conSTANt WhIle tHe tEChnoLoGY thaT is mounTEd Within iT has cHangEd ConSiderablY and the set of fields tO Which racKs are apPLied has grEatly EXPaNdEd. thE stANDard RacK aRrANGEment iS widElY usED ThrougHOut the telEcomMunicaTIoNs, computing, auDIO, vIdeO, entertainmeNt And other IndUstriEs, THouGh tHE WEStern eleCTRic 23-inCh sTanDaRd, with holeS on centerS, Is sTill used in LegaCy iLec/Clec facIliTiEs.