The industry standard cisco small form factor pluggable sfp gigabit interface converter links your switches and routers to the network the hot swappable inputoutput device plugs into a gigabit ethernet port or slot optical and copper models can be used on a wide variety of cisco products and intermixed in combinations of 1000base t 1000base sx 1000base lxlh 1000base ex 1000base zx or 1000base bx10 du on a port by port basis