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m Clarify that SFP+ and SFP28 were published separately. |
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The [[Form factor (design)|form factor]] and electrical interface are specified by a [[multi-source agreement]] (MSA) under the auspices of the [[Small Form Factor Committee]].<ref name="sfpmsa"/> The SFP replaced the larger [[gigabit interface converter]] (GBIC) in most applications, and has been referred to as a '''Mini-GBIC''' by some vendors.<ref name="Cisco MGBSX1"/>
SFP transceivers exist supporting [[synchronous optical networking]] (SONET), [[Gigabit Ethernet]], [[Fibre Channel]], [[Passive optical network|PON]], and other communications standards. At introduction, typical speeds were 1 Gbit/s for Ethernet SFPs and up to 4 Gbit/s for Fibre Channel SFP modules.<ref>{{cite web|url=https://www.flexoptix.net/en/transceiver/sfp-singlemode-transceiver-4g-fc-sm-1310nm-5km-10db-ddm-dom.html?co3101=18397 |title=4G Fibre Channel SFP |publisher=Flexoptix GmbH |access-date=2019-10-05}}</ref> In 2006, '''SFP+''' specification brought speeds up to 10 Gbit/s and the later '''SFP28''' iteration, introduced in 2014,<ref>{{Cite web |date=2022-12-02 |title=DRAFT SFF-8402 CB |url=https://members.snia.org/document/dl/35505 |access-date=2024-09-24 |website=SNIA Members |publisher=Storage Networking Industry Association (SNIA)}}</ref> is designed for speeds of 25 Gbit/s.<ref name="snia"/>
A slightly larger sibling is the four-lane '''Quad Small Form-factor Pluggable''' ('''QSFP'''). The additional lanes allow for speeds 4 times their corresponding SFP. In 2014, the '''QSFP28''' variant was published allowing speeds up to 100 Gbit/s.<ref name="sff-8665"/> In 2019, the closely related '''QSFP56''' was standardized<ref name="sff-8636r2.9.2draft" /> doubling the top speeds to 200 Gbit/s with products already selling from major vendors.<ref>{{Cite web|url=http://www.mellanox.com/related-docs/prod_ib_switch_systems/PB_QM8700.pdf|title=Mellanox Quantum 8700 40 port QSFP56 Product Brief}}</ref> There are inexpensive adapters allowing SFP transceivers to be placed in a QSFP port.
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