MSP 217 SDI Extender consists of SDI transmitter（MSP 217 TX SDI to Fiber）and SDI receiver （MSP 217 RX Fiber to SDI）, SDI signal is realized by a single core mode fiber. And SDI digital video signal has to fulfill the long-distance transmission during the multimedia application System. But when you use an ordinary cable for long distance transmission, it will always show the poor output signal, be easy of the interference, the mage displayed appears the phenomenon of the vague, the tailing and color separation etc. At the same time, the distance of transmission is short, it can not meet the requirement of long-distance transmission for the multimedia information issuing and so on, using the MSP 217 SDI Extender for transmitting, this kind of problem has been completely solved. The distance of transmission is10km in single mode. In the meanwhile, the SDI Extender has the outstanding points with a little attenuation, high-frequency bandwidth, strong anti-interference, high safety performance, small volume and light in weight etc., therefore, it has incomparable advantages in the respect of the special environment and the long distance transmission. It is used in the multimedia system, which saves the construction cost and easy for cable arrangement, and the target of high-quality performance is also guaranteed.