The small form-factor pluggable (SFP) is a compact optical transceiver module used in optical communications for both telecommunication and data communications applications. SFP transceivers as the upgrade version of GBIC modules, is also called Mini GBIC. 

SFP Modules are designed to support SONET/SDH, Gigabit Ethernet, Fiber Channel, Optical Supervisory Channel OSC SFP and other communications standards