The Cisco® MFEFX1 100BASE-FX Mini-GBIC SFP Transceiver is an easy-to-install mini Gigabit Interface Converter (mini-GBIC) Small Form-Factor Pluggable (SFP) transceiver module that provides a simple way to add 100BASE-FX capability to your Cisco switch. The module operates at a wavelength of 1310 nm and supports multimode 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. 100BASE-FX is used mainly within a building or small campus network needing 100-Mbps connectivity between sites. The Cisco MFEFX1 can be used with wide variety of Cisco switches to create solutions that meet a broad range of needs. For other Cisco mini-GBIC transceiver modules, see the Cisco MFELX1 100BASE-LX Mini-GBIC SFP Transceiver, Cisco MGBSX1 Gigabit SX Mini-GBIC SFP Transceiver, and Cisco MGBLH1 Gigabit LH Mini-GBIC SFP Transceiver.