Small form-factor pluggable interface
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The SFP interface (Small Form Factor Pluggable interface) is an industry standard daughter card used in networking devices (esp. those by Cisco). It essentially interfaces a network device mother board (for a router or similar device) with a fibre optic cable using an SFF Connector. Such boards can carry data at speeds of around 5GBit/s. Their main advantage is that new speeds can be interfaced to an expensive network device by changing only the SFP module.