Modular KVM extender RX expansion card adds support for USB 2.0 for Single Mode Fiber connectivity. Use with the DKM FX chassis for modular switching or as a point-to-point KVM extender. Single-mode can go up to 10 km (6 miles) and multimode can transmit up to 1000 meters (3281 feet). USB 2.0 @ 480 Mbps Occupies (1) slot of housing space. Compatible with the DKM FX Compact Extender.