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Gigabit Ethernet Media Converter Used in LED Display Transmission System

LI Shuang1,2,ZHENG Xi-feng1,YAN Fei1,2(1.Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences, Changchun 130033,China2.Graduate University of Chinese Academy of Sciences,Beijing 100039,China)  
For different distance requirement of LED control system,a Gigabit Ethernet media converter between twisted pair and fiber optic was designed.Ethernet standards 802.3ab and 802.3z were introduced.Taking 1000BASE-T and 1000BASE-LX as an example,signal transmission characteristics on the two physical layers was studied in details which were regarded as a basis for building the system structure.By analyzing the transmission frame structure,master FPGA controller was designed for data storing and forwarding.Data frame unpacking and reconstruction were also realized in the controller.The result showed that the system design matched the Ethernet standard on physical layer.The effective transmission rate was up to 2 Gbit/s both in twisted pare and optic fiber.The transmission distance could be 100 m~10 km.With two kinds of medium used in LED transmission system,the highest price quality could be achieved when constructing the network.The design could be a refe-rence for long-distance,real-time,general video transmission besides the LED display.
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