The FiDO-4T-ST and 4R-ST Four Channel 3G-SDI to Fiber Converter set from AJA enables SDI signals to be extended up to 6.2 miles (10 km) with electrical isolation, useful for eliminating ground loop problems.  It uses a compact, low-profile enclosure that works well in tight spaces around and behind equipment racks, trucks, and on-camera. Kit includes both the Transmitter and Receiver.