Abstract: A cable bend radius control attachment is used in combination with a cable-routing, vertical, slotted channel member defined by walls and including a plurality of longitudinally spaced cable slots. The cable slots are adapted for receiving and distributing optical fiber cable into and out of the vertical channel member. The attachment includes a generally U-shaped flange having an inner edge portion secured to a mouth of the cable slot and an opposing outer edge portion spaced from the mouth of the cable slot. The flange has a generally convex, arcuate surface between its inner and outer edge portions for extending outwardly from the channel member at a mouth of the cable slot. The flange defines a predetermined minimum bend radius for cable entering or exiting the channel member through the cable slot. The flange includes a base and opposing resilient sides integrally-formed with the base.