Plan for 30% extra U-space and 6+ inches of extra depth. Modern racks must accommodate deeper PoE++ switches, thermal ventilation for 10Gbps equipment, and stricter bend radii for Cat6A cabling. A range of cable managers and accessories work with the rack. Power Distribution Units (PDUs): PDUs distribute power to the equipment housed in the. A well-designed network rack cable management system not only makes cabling neater but also improves heat dissipation efficiency, reduces the risk of failure, and leaves room for future expansion. What Cable Management Does for a Network Cabinet A cable management rack is designed to route, protect, and organize copper and fiber cables inside.