An equipment rack with a compact adjustable cable management arm is disclosed. The equipment rack includes a plurality of chassis slots arranged vertically. Each chassis slot is operable to hold at least one removable electronic device. A pair of side rails supports the plurality of chassis slots. An adjustable cable management arm is located on one end of the side rails. The adjustable cable management arm has at least a first vertical position allowing access to one of the chassis slots. The adjustable cable management arm has a second vertical position allowing access to another of the chassis slots blocked by the cable management arm when the cable management arm is in the first vertical position.