SFP transceiver
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The Small Form-factor Pluggable (SFP) is a compact optical transceiver used in telecom and datacom applications. It is a popular industry format supported by most fiber optic component vendors. The primary advantages of this approach are hot pluggability, field replacabilty, and mix and match optical reach and type.
Typical datarates are 2.5 Gbit/s and lower.
The 10 Gbit/s is called XFP.
An SFP can either be a copper or fiber transceiver. Mostly they are fiber, but there are some instances where it is practical to use a copper SFP in a mostly fiber environment.