The industry-standard Cisco® Small Form-Factor Pluggable (SFP) Gigabit
Interface Converter is a hot-swappable input/output device that plugs into a
Gigabit Ethernet port or slot, linking the port with the network (Figures 1 and
2). SFPs can be used and interchanged on a wide variety of Cisco products and
can be intermixed in combinations of 1000BASE-T, 1000BASE-SX, 1000BASE-LX/LH,
1000BASE-EX, 1000BASE-ZX, or 1000BASE-BX10-D/U on a port-by-port basis.