D-Link 10/100/1000 Base-T to 1000 Base-SX Multi-Mode Fiber SC Media Converter, 850nm Fiber Wavelength, 550m, 2000Mbps, Full Duplex, EU/UK Plug | DMC-700MSC

Media converters  convert  signals  that  are  transmitted  from  one  type  of  media  to  another so that they can be transmitted over a different type of media. This series of media converters converts 10/100/1000 Mbps copper ethernet to a 100/1000 Mbps  fibre optic connection connection.This allows you to expand your network by connecting longer distance,cables between  devices  that  are  otherwise  connected with short distance Ethernet cables, such as Cat.6 twisted-pair cables.