The Cisco MFELX1 100BASE-LX Mini-GBIC SFP Transceiver from Linksys is an add-on transceiver for select Linksys switches. Installing in a standard Mini-GBIC expansion slot, the transceiver supports Gigabit data transfer over fiber optic cabling. Capable of transferring data at speeds of up to 1000Mbps over distances of up to 1640 feet (500 m), the transceiver is the perfect way to add high-speed Gigabit transfer to your network.