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3G-SDI (3G Serial Digital Interface) recently has become increasingly popular in the application of video and audio transmission system. However, the traditional copper wire cable imposes limits on signal transmission distance and signal quality. Optical fiber delivers low dispersion, longer distance and better signal transmission quality in comparison to the traditional copper wire cable. APAC 3G-SDI extender uses only single fiber to fulfill long distance communication, where radio frequency interference phenomenon is literally ruled out, which shows the advantage of high performance and good signal quality as well as low cost extension.