Further information for Cisco GLC-FE-100LX-RGD= - Rugged SFP SFP (mini GBIC) transceiver module
The Cisco 100BASE-X Small Form-factor Pluggable (SFP) is a hot-swappable input/output device that plugs into a Fast Ethernet port or slot, linking the port with the network. The Cisco 100BASE-LX10 SFP operates on ordinary single-mode fiber-optic (SMF) link spans up to 10 kilometers long.