ADD-GMC-SX-5ST is a Media Converter that converts a 1000Base-TX(RJ45) to 1000Base-SX(ST) via a 850nm multi-mode fiber (MMF) ST connector, which allows distance reach up to 550m. ADD-GMC-SX-5ST provides a cost effective conversion from 1000Base Copper to 1000Base-SX 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.