The MFEFX1 is an easy-to-install Mini-GBIC (SFP) transceiver module that provides a simple way to add 100 Base-FX functionality to your Linksys switch. The module operates at a wavelength of 1310 nanometer and supports multi-mode fiber optic cabling. In a typical operating environment, it can achieve distances up to 2 km depending on the total attenuation in the fiber plant. 100 Base-FX is mainly used within a building or in small campus networks needing 100 Mbps connectivity between sites.