The 42-U rack offers several features that simplify cable routing
(see Figure 1-11).
Four cable-routing channels in each rack flange allow you to route power
distribution unit (PDU) power cables to the systems mounted in the rack.
Cable clips mounted on the frame uprights keep cables out of the way and
help prevent cords from becoming tangled.
Figure 1-11. Cable-Routing Options
cable-routing channels (4)
cable exit route
Dell™ PowerEdge™ 4210 Installation Guide