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10 Gbit/s SFP+ modules are exactly the same dimensions as regular SFPs, allowing the equipment manufacturer to re-use existing physical designs for 24 and 48-port switches and modular [[line card]]s. In comparison to earlier [[XENPAK]] or [[XFP]] modules, SFP+ modules leave more circuitry to be implemented on the host board instead of inside the module.<ref>{{cite web |url= http://www.lightwaveonline.com/articles/print/volume-23/issue-4/technology/10-gigabit-ethernet-camp-eyes-sfp-53428172.html|title=10-Gigabit Ethernet camp eyes SFP+ |work=LightWave |date=April 2006 }}</ref> Through the use of an active electronic adapter, SFP+ modules may be used in older equipment with [[XENPAK]] ports <ref>{{Cite web|url=https://www.flexoptix.net/en/10-gigabit-xenpak-sfp-plus-adapter.html|title=SFP+ to XENPAK adapter}}</ref> and [[X2 transceiver|X2]] ports.<ref>{{Cite web|url=https://www.optcore.net/product/cisco-cvr-x2-sfp10g-compatible-10gbase-x2-to-sfp-converter-module/|title=10GBASE X2 to SFP+ Converter|date=December 27, 2016 }}</ref><ref>{{Cite web|url=https://unoptix.com/collections/10g-sfp|title=SFP Transceiver}}</ref>
SFP+ modules can be described as ''limiting'' or ''linear'' types; this describes the functionality of the inbuilt electronics. Limiting SFP+ modules include a signal amplifier to re-shape the (degraded) received signal whereas linear ones do not. Linear modules are mainly used with the low bandwidth standards such as [[10 Gigabit Ethernet#10GBASE-LRM|10GBASE-LRM]]; otherwise, limiting modules are preferred.<ref>{{cite web |url= http://www.lightwaveonline.com/general/the-road-to-sfp-examining-module-and-system-architectures-54884162.html |title=The road to SFP+: Examining module and system architectures |date= January 22, 2008 |author= Ryan Latchman and Bharat Tailor |work= Lightwave |access-date=2011-07-26 |archive-url=
=== 25 Gbit/s SFP28 ===
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