Maximum distance over CATx is 460 feet (140 m). Also available in models compatible with single-mode fiber optic cable. Compact housing enables high-density mounting within 19" racks (up to four devices in 1U). Chassis range in size from 2, 4, 6, or 21 ports, to 48, 80, 160, and 288 ports.The compact extenders also work as standalone, point-to-point KVM extenders.