Cisco's industry-standard SFP is a hot-swappable input/output device that plugs into a Fast Ethernet port/slot, linking the port with the fiber-optic network. SFPs can be used and interchanged on a wide variety of Cisco products.
The Cisco GLC-FE-100LX can be used to link a Fast Ethernet port with a fiber network. The GLC-FE-100LX operates at 1310nm through singlemode fiber over 10km.