The cisco 100base fx small form factor pluggable sfp fast ethernet interface converter glc ge 100fx is a hot swappable device that plugs into a gigabit ethernet sfp port on cisco catalyst 3750 series 3560 series and 2970 series switches the cisco sfp provides full duplex 100 mbps connectivity between switches over multimode fiber mmf infrastructures it offers investment protection and an easy migration path for customers moving to gigabit ethernet connections in the future the 100ba