Small form-factor pluggable interface
From Academic Kids
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.
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