The emEXTEND-12G-D-SM-RX is a miniature converter device that converts Optical to Electrical 12G SDI. The converter can be used as part of an 12G SDI over fiber optical extender when paired with the emEXTEND-12G-D-SM-TX device. The device accepts any SD/HD-SDI, 3G, 12G SDI signals. No configuration required.