ADD-FMC-FX-4SC is a Media Converter that converts a 100Base-TX(RJ45) to 100Base-LX(SC) via a 1310nm single-mode fiber (SMF) SC connector, which allows distance reach up to 40km. ADD-FMC-FX-4SC provides a cost effective conversion from 100Base Copper to 100Base-LX fiber, while extending the network reach beyond the 100m reach limitation of copper. Addoncomputer.com Media Converters and Network Interface Cards are 100% compliant for all of our networking needs. Now you have a cost effective solution to your network upgrade needs. With our ADDON CERTIFICATION TEST Program, we can guarantee your product will work right the first time.