Editing Small Form-factor Pluggable (section)

==Standardization==
The SFP transceiver is not standardized by any official standards body, but rather is specified by a [[multi-source agreement]] (MSA) among competing manufacturers. The SFP was designed after the [[GBIC]] interface, and allows greater ''port density'' (number of transceivers per given area) than the GBIC, which is why SFP is also known as mini-GBIC.

However, as a practical matter, some networking equipment manufacturers engage in [[vendor lock-in]] practices whereby they deliberately break compatibility with ''generic'' SFPs by adding a check in the device's [[firmware]] that will enable only the vendor's own modules.<ref>{{cite web |url=http://www.toad.com/gnu/sysadmin/sfp-lockin.html |title=Gigabit Ethernet fiber SFP slots and lock-in |author=John Gilmore |access-date=2010-12-21}}</ref> Third-party SFP manufacturers have introduced SFPs with EEPROMs which may be programmed to match any vendor ID.<ref>{{Cite web|url=https://www.flexoptix.net/en/flexbox-series-configure-universal-transceivers.html?395=1357&co9424= |title=FLEXBOX SERIES - CONFIGURE UNIVERSAL TRANSCEIVERS |access-date=2019-09-20}}</ref>