A telecommunications rack cable support bracket is provided which comprises a pair of parallel support members and a plurality of cross members extending therebetween. The arrangement of the support members and the cross members defines two openings through which cable may be routed. Each support member includes tabs for securely positioning the telecommunications rack cable support bracket onto a telecommunications rack by interfacing with the horizontal Z-brackets of the telecommunications rack, thus eliminating the need for the use of special mechanical fasteners. Each cross member includes a pair of downwardly extending tabs which serve to locate the telecommunications rack cable support bracket between two U-shaped brackets of the telecommunications rack. These tabs also provide stress concentration relief for cable bundles routed from U-channels across the telecommunications rack cable support bracket. Cable bundles are securely routed across the telecommunications rack cable support bracket by use of cable bundle management devices which are detachably received in openings in each cross member.