The FiDO-4T-MM is a quad-channel transmitter that takes four independent 3G/HD/SD-SDI inputs and converts each to a fibre output, over four simplex or two duplex LC connections. It supports 4K/UltraHD-SDI over the four fibre links, runs up to 700 m on OM4 or 300 m on OM3 multi-mode fibre, carries SDI metadata including HDR pass-through, and ships with a 5-20VDC universal power supply.