A waterfall-type cable router for routing cables out of cable trays includes a curved ramp having a front portion and a rear portion, a vertical left curved wall transitioning into the curved ramp and extending the length of the left side of the curved ramp, and a vertical right curved wall transitioning into the curved ramp and extending the length of the right side of the curved ramp. The rear portion of the curved ramp has a population of tabs configured to attach to an extender. The extender allows a waterfall-type cable router assembly to rest on a wire cable tray with a sidewall of a higher length than the length of the cable router.