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m Clarify that SFP+ and SFP28 were published separately.
→top: as a result of discussion, merged into another article, see Talk:Small_Form-factor_Pluggable#Merge_from_Small_Form_Factor_Committee
 
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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 {{nowrap|1&nbsp; Gbit/s}} for Ethernet SFPs and up to {{nowrap|4&nbsp; 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 {{nowrap|10&nbsp; 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 {{nowrap|25&nbsp; 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 {{nowrap|100&nbsp; 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 {{nowrap|200&nbsp; 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.
 
Both a '''SFP-DD''',<ref name="SFP-DD MSA"/> which allows for {{nowrap|100&nbsp; Gbit/s}} over two lanes, as well as a '''QSFP-DD'''<ref name="QSFP-DD MSA"/> specifications, which allows for {{nowrap|400&nbsp; Gbit/s}} over eight lanes, have been published.<ref name="Lightwave" /> These use a [[Form factor (design)|form factor]] which is directly [[Backward compatibility|backward compatible]] to their respective predecessors.<ref>{{cite web |title=Backward Compatibility: QSFP-DD/QSFP28/QSFP+/SFP+ |url=https://www.qsfptek.com/article/backward-compatibility-qsfp-dd-qsfp28-qsfp-sfp |publisher=Derek |access-date=21 July 2022}}</ref>
 
An even larger sibling, the '''OSFP (Octal Small Format Pluggable)''' has('''OSFP'''), productshad beingproducts released in 2022<ref>{{Cite web|title=Introduction - NVIDIA QM97X0 NDR SWITCH SYSTEMS USER MANUAL - NVIDIA Networking Docs|url=https://docs.nvidia.com/networking/display/QM97X0PUB/Introduction#Introduction-speeds|access-date=2022-01-18|website=docs.nvidia.com}}</ref> capable of {{nowrap|800&nbsp; Gbit/s}} links between network equipment. It is a slightly larger version than the QSFP form factor allowing for larger power outputs. The OSFP standard was initially announced in 2016<ref name="OSFP MSA" /> with the 4.0 version released in 2021 allowing for {{nowrap|800&nbsp; Gbit/s}} via 8×100&nbsp;8×{{nowrap|100 Gbit/s}} electrical data lanes.<ref>{{Cite press release|orig-date=2021-06-03|title=OSFP MSA Announces Release of OSFP 4.0 Specification for 800G Modules|url=https://www.osfpmsa.org/press-releases/pr-20210603.html|access-date=2022-01-18|website=www.osfpmsa.org|quote=With the 800G spec completed, group is developing specification for 1600G modules}}</ref> Its proponents say a low-cost adapter will allow for backwards compatibility with QSFP modules.<ref>{{cite web|url=https://osfpmsa.org/assets/pdf/OSFP-to-QSFP-Adapter.pdf|title=OSFP to QSFP Adapter |access-date=2021-11-02}}</ref>
 
==SFP types==
SFP transceivers are available with a variety of transmitter and receiver specifications, allowing users to select the appropriate transceiver for each link to provide the required ''optical'' or ''electrical reach'' over the available media type (e.g. [[twisted pair]] or [[Twinaxial cabling|twinaxial]] copper cables, [[multi-mode]] or [[single-mode]] fiber cables). Transceivers are also designated by their transmission speed. SFP modules are commonly available in several different categories.
 
{| class="wikitable" style="text-align: center; "
|+ Comparison of SFP types
|-
! Name
! Nominal <br/>speed
! Lanes
! Standard
! Introduced
! Backward -compatible
! [[PHY#Ethernet physical transceiver|PHY]] interface
! Connector
|-
| align="left" | SFP
| {{nowrap|100&nbsp; Mbit/s}}
| 1
| [[Small Form Factor Committee|SFF]] INF-8074i
| 2001-05-01
| {{n/a|None}}
| none
| MII
| LC, RJ45
|-
| align="left" | SFP
| {{nowrap|1&nbsp; Gbit/s}}
| 1
| [[Small Form Factor Committee|SFF]] INF-8074i
| 2001-05-01
| {{nowrap|100&nbsp; Mbit/s}} SFP*
| SGMII
| LC, RJ45
|-
| align="left" | cSFP
| {{nowrap|1&nbsp; Gbit/s}}
| 2
|
Line 61:
|-
| align="left" |SFP+
| {{nowrap|10&nbsp; Gbit/s}}
| 1
| [[Small Form Factor Committee|SFF]] SFF-8431 4.1
Line 70:
|-
| align="left" | SFP28
| {{nowrap|25&nbsp; Gbit/s}}
| 1
| [[Small Form Factor Committee|SFF]] SFF-8402
Line 79:
|-
| align="left" | SFP56
| {{nowrap|50&nbsp; Gbit/s}}
| 1
|
Line 88:
|-
| align="left" | SFP-DD
| {{nowrap|100&nbsp; Gbit/s}}
| 2
| rowspan="3" | SFP-DD MSA<ref name=sfp-dd.spec/>
Line 97:
|-
| align="left" | SFP112
| {{nowrap|100&nbsp; Gbit/s}}
| 1
| 2018-01-26
Line 105:
|-
| align="left" | SFP-DD112
| {{nowrap|200&nbsp; Gbit/s}}
| 2
| 2018-01-26
Line 115:
|-
| align="left" | QSFP
| {{nowrap|4&nbsp; Gbit/s}}
| 4
| [[Small Form Factor Committee|SFF]] INF-8438
| 2006-11-01
| {{n/a|None}}
| none
| GMII
|
|-
| align="left" | QSFP+
| {{nowrap|40&nbsp; Gbit/s}}
| 4
| [[Small Form Factor Committee|SFF]] SFF-8436
| 2012-04-01
| {{n/a|None}}
| none
| XGMII
| LC, MTP/MPO
|-
| align="left" | QSFP28
| {{nowrap|50&nbsp; Gbit/s}}
| 2
| [[Small Form Factor Committee|SFF]] SFF-8665
Line 142:
|-
| align="left" | QSFP28
| {{nowrap|100&nbsp; Gbit/s}}
| 4
| [[Small Form Factor Committee|SFF]] SFF-8665
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|-
| align="left" | QSFP56
| {{nowrap|200&nbsp; Gbit/s}}
| 4
| [[Small Form Factor Committee|SFF]] SFF-8665
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|-
| align="left" | QSFP112
| {{nowrap|400&nbsp; Gbit/s}}
| 4
| [[Small Form Factor Committee|SFF]] SFF-8665
Line 169:
|-
| align="left" | QSFP-DD
| {{nowrap|400&nbsp; Gbit/s}}
| 8
| [[Small Form Factor Committee|SFF]] INF-8628
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|
| LC, {{nowrap|MTP/MPO-16}}
|-
|}
 
Note that the QSFP/QSFP+/QSFP28/QSFP56 are designed to be electrically backward compatible with SFP/SFP+/SFP28 or SFP56 respectively. Using a simple adapter or a special direct attached cable it is possible to connect those interfaces together using just one lane instead of four provided by the QSFP/QSFP+/QSFP28/QSFP56 form factor. The same applies to the QSFP-DD form factor with 8 lanes which can work downgraded to 4/2/1 lanes.
 
=== {{nowrap|100&nbsp; Mbit/s}} SFP ===
<!--Information below would probably be better presented as a table-->
<!--https://members.snia.org/document/dl/26184-->
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** [[100BASE-TX]]{{snd}} for distances up to 100m.
 
=== {{nowrap|1 Gbit/s}} SFP ===
<!--Information below would probably be better presented as a table-->
* 1 to 1.{{nowrap|25&nbsp; Gbit/s}} multi-mode fiber, [[LC connector]], with black or beige extraction lever<ref name="sfpmsa"/>
** '''SX'''{{snd}}850&nbsp;nm, for a maximum of 550&nbsp;m at 1.{{nowrap|25&nbsp; Gbit/s}} (gigabit Ethernet). Other multi-mode SFP applications support even higher rates at shorter distances.<ref>{{citation |url=http://agilestar.com/p/datasheets/FTLF8524P2BNV-AS.pdf |title=Agilestar/Finisar FTLF8524P2BNV specification}}</ref>
* 1 to 1.{{nowrap|25&nbsp; Gbit/s}} multi-mode fiber, [[LC connector]], extraction lever colors not standardized
** '''SX+/MX/LSX/LX''' (name dependent on manufacturer){{snd}}1310&nbsp;nm, for a distance up to 2&nbsp;km.<ref>{{Cite web|url=https://www.cdw.com/shop/products/PROLINE-1000BASE-SX-EXT-MMF-SFP-F-CISCO-1310NM-2KM/2240353.aspx|title=PROLINE 1000BASE-SX EXT MMF SFP F/CISCO 1310NM 2KM - SFP-MX-CDW - Ethernet Transceivers|website=CDW.com|access-date=2017-01-02}}</ref> Not compatible with SX or 100BASE-FX. Based on LX but engineered to work with a multi-mode fiber using a standard multi-mode patch cable rather than a mode-conditioning cable commonly used to adapt LX to multi-mode.
* 1 to 2.{{nowrap|5&nbsp; Gbit/s}} single-mode fiber, LC connector, with blue extraction lever<ref name="sfpmsa"/>
** '''LX'''{{snd}}1310&nbsp;nm, for distances up to 10&nbsp;km (originally, '''LX''' just covered 5&nbsp;km and '''LX10''' for 10&nbsp;km followed later)
** '''EX'''{{snd}}1310&nbsp;nm, for distances up to 40&nbsp;km
Line 216 ⟶ 215:
** '''SFSW'''{{snd}}single-fiber single-wavelength transceivers, for bi-directional traffic on a single fiber. Coupled with CWDM, these double the traffic density of fiber links.<ref>{{cite web |url=http://www.lightwaveonline.com/articles/2002/09/single-fiber-single-wavelength-gigabit-transceivers-53448792.html|title=Single-fiber single-wavelength gigabit transceivers |access-date=2002-09-05 |work=Lightwave|date=September 5, 2002 }}</ref><ref>{{cite web |url=http://www.gigalight.com.cn/solutions/&FrontComContent_list01-12987118519831ContId=3878029b-493c-4e70-b97c-766776c55cd0&comContentId=3878029b-493c-4e70-b97c-766776c55cd0&comp_stats=comp-FrontComContent_list01-12987118519831.html |title=The principle of Single Wavelength BiDi Transceiver |publisher=Gigalight |url-status=dead |archive-url=https://web.archive.org/web/20140403232845/http://www.gigalight.com.cn/solutions/%26FrontComContent_list01-12987118519831ContId%3D3878029b-493c-4e70-b97c-766776c55cd0%26comContentId%3D3878029b-493c-4e70-b97c-766776c55cd0%26comp_stats%3Dcomp-FrontComContent_list01-12987118519831.html |archive-date=2014-04-03 |df=mdy-all }}</ref>
** [[Coarse wavelength-division multiplexing]] (CWDM) and [[dense wavelength-division multiplexing]] (DWDM) transceivers at various wavelengths achieve various maximum distances. CWDM and DWDM transceivers usually support link distances of 40, 80 and 120&nbsp;km.
* {{nowrap|1&nbsp; Gbit/s}} for copper twisted-pair cabling, [[RJ45 (telecommunications)|8P8C]] (RJ-45) connector
** [[1000BASE-T]]{{snd}}these modules incorporate significant interface circuitry for [[Physical Coding Sublayer]] recoding<ref>{{citation |url=http://www.vitesse.com/products/download.php?fid=295&number=VSC8211 |title=VSC8211 media converter/physical layer specification}}</ref> and can be used only for [[gigabit Ethernet]] because of the specific line code. They are not compatible with (or rather: do not have equivalents for) [[Fibre Channel]] or SONET. Unlike most non-SFP, copper 1000BASE-T ports integrated into most routers and switches, 1000BASE-T SFPs usually cannot operate at [[100BASE-TX]] speeds.
* {{nowrap|100 Mbit/s}} copper and optical{{snd}}some vendors have shipped {{nowrap|100&nbsp; Mbit/s}} limited SFPs for [[fiber-to-the-home]] applications and drop-in replacement of legacy [[100BASE-FX]] circuits. These are relatively uncommon and can be easily confused with {{nowrap|100&nbsp; Mbit/s}} SFPs.<ref>{{Cite web|url=http://www.fs.com/c/100base-sfp_1668|title=Fiberstore: 100&nbsp;M SFPs}}</ref>
* Although it is not mentioned in any official specification document the maximum data rate of the original SFP standard is {{nowrap|5&nbsp; Gbit/s}}.<ref>{{cite web|url=http://www.siemon.com/sis/application-guide/2010-08-20-FAQs-for-SFP-plus.asp |title=FAQs for SFP+ |publisher=The Siemon Company |date=2010-08-20 |access-date=2016-02-22}}</ref> This was eventually used by both 4GFC Fibre Channel and the DDR Infiniband especially in its four-lane QSFP form.
*In recent years,{{when|date=January 2020}} SFP transceivers have been created that will allow [[2.5GBASE-T and 5GBASE-T|2.{{nowrap|5&nbsp; Gbit/s}} and {{nowrap|5&nbsp; Gbit/s}} Ethernet]] speeds with SFPs with 2.5GBASE-T<ref>{{cite web|url=https://www.flexoptix.net/en/transceiver/sfp-t-transceiver-2h-gigabit-cat-5e-rj-45-100m-100m-1000m-2500-base-t.html?co8829=85744 |title=2.5GBASE-T Copper SFP |publisher=Flexoptix GmbH |access-date=2019-10-04}}</ref> and 5GBASE-T.<ref>{{cite web|url=https://www.flexoptix.net/en/transceiver/sfp-t-transceiver-5-gigabit-cat-5e-rj-45-70m-100m-1000m-5gbase-t.html?co8831=85745|title=5GBASE-T Copper SFP|publisher=Flexoptix GmbH|access-date=2019-10-04}}</ref>
 
==={{anchor|SFP+}}{{nowrap|10 Gbit/s}} SFP+<!--[[Enhanced small form-factor pluggable transceiver]] redirects here-->===
[[File:10_Gbit_XFP_and_SFP_transceivers.jpg|thumb|350px|right|A [[10 Gigabit Ethernet]] [[XFP transceiver]], ''top'', and a SFP+ transceiver, ''bottom'']]
 
The '''SFP+''' ('''enhanced small form-factor pluggable''') is an enhanced version of the SFP that supports data rates up to 16&nbsp;[[Gbit/s]]. The SFP+ specification was first published on May 9, 2006, and version 4.1 was published on July 6, 2009.<ref name="spec">{{cite web|url=https://members.snia.org/document/dl/25891|title=SFF-8431 Specifications for Enhanced Small Form Factor Pluggable Module SFP+ Revision 4.1|date=July 6, 2009|access-date=2023-09-25}}</ref> SFP+ supports {{nowrap|8&nbsp; Gbit/s}} [[Fibre Channel]], [[10 Gigabit Ethernet]] and [[Optical Transport Network]] standard OTU2. It is a popular industry format supported by many network component vendors. Although the SFP+ standard does not include mention of {{nowrap|16&nbsp; Gbit/s}} Fibre Channel, it can be used at this speed.<ref>{{cite web |url=http://www.tek.com/primer/characterizing-sfp-transceiver-16g-fibre-channel-rate|title=Characterizing an SFP+ Transceiver at the 16G Fibre Channel Rate |author=Tektronix | date= November 2013 }}</ref> Besides the data rate, the major difference between 8 and {{nowrap|16&nbsp; Gbit/s}} Fibre Channel is the encoding method. The [[64b/66b encoding]] used for {{nowrap|16&nbsp; Gbit/s}} is a more efficient encoding mechanism than [[8b/10b encoding|8b/10b]] used for {{nowrap|8&nbsp; Gbit/s}}, and allows for the data rate to double without doubling the line rate. 16GFC doesn't really use {{nowrap|16&nbsp; Gbit/s}} signaling anywhere. It uses a 14.{{nowrap|025&nbsp; Gbit/s}} line rate to achieve twice the throughput of 8GFC.<ref>{{cite web
|title = Roadmaps
|url = https://fibrechannel.org/roadmap/
Line 234 ⟶ 233:
SFP+ also introduces [[10 Gigabit Ethernet#SFP+ direct attach|direct attach]] for connecting two SFP+ ports without dedicated transceivers. Direct attach cables (DAC) exist in passive (up to 7&nbsp;m), active (up to 15&nbsp;m), and active optical (AOC, up to 100&nbsp;m) variants.
 
{{nowrap|10&nbsp; 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=https://archive.today/20130128011127/http://www.lightwaveonline.com/articles/2008/01/the-road-to-sfp-examining-module-and-system-architectures-54884162.html |archive-date=2013-01-28 }}</ref>
 
=== {{nowrap|25&nbsp; Gbit/s}} SFP28 ===
SFP28 is a {{nowrap|25&nbsp; Gbit/s}} interface which evolved from the [[100 Gigabit Ethernet]] interface which is typically implemented with 4 by {{nowrap|25&nbsp; Gbit/s}} data lanes. Identical in mechanical dimensions to SFP and SFP+, SFP28 implements one {{nowrap|28&nbsp; Gbit/s}} lane<ref>{{Cite web|url=http://www.ethernetsummit.com/English/Collaterals/Proceedings/2015/20150414_H13_Neer.pdf|title=Ethernet Summit SFP28 examples}}</ref> accommodating {{nowrap|25&nbsp; Gbit/s}} of data with encoding overhead.<ref>{{Cite web|url=http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/datasheet-c78-736950.html|title=Cisco SFP28 product examples}}</ref>
 
SFP28 modules exist supporting single-<ref>{{Cite web|url=http://global-sei.com/company/press/2016/03/prs022.html|title=SFP28 LR 1310&nbsp;nm transceivers}}</ref> or multi-mode<ref>{{Cite web|url=http://www.smartoptics.com/wp-content/uploads/2015/08/SO-SFP28-SR-R4.0.pdf|title=SFP28 850&nbsp;nm example product}}</ref> fiber connections, active optical cable<ref>{{cite web |url=https://www.mellanox.com/related-docs/prod_cables/PB_MFA2P10-Axxx_SFP25G-AOCxxM-TG_25GbE_SFP28_AOC.pdf |title=25GbE SFP28 Active Optical Cable |publisher=Mellanox |access-date=2018-10-25}}</ref> and direct attach copper.<ref>{{cite web |url=https://www.intel.com/content/dam/www/public/us/en/documents/product-briefs/ethernet-sfp28-cables-brief.pdf |title=Intel Ethernet SFP28 Twinaxial Cables |access-date=2018-10-25}}</ref><ref>{{Cite web|url=http://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/datasheet-c78-736950.pdf|title=Cisco SFP28 direct attach cables}}</ref>
Line 257 ⟶ 256:
* QSFP-DD: {{val|400|u=Gbit/s}}/{{val|200|u=Gbit/s}} (8 × {{val|50|u=Gbit/s}} and 8 × {{val|25|u=Gbit/s}})<ref>SFF INF-8628</ref>
* QSFP-DD800 (formerly QSFP-DD112): {{val|800|u=Gbit/s}} (8 × {{val|112|u=Gbit/s}})<ref name=qsfp-dd.msa/>
* QSFP-DD1600 (Draft) {{val|1.6|u=Tbit/s}}<ref>{{cite web |url=http://www.qsfp-dd.com/wp-content/uploads/2024/07/QSFP-DD-Hardware-Rev7.1.pdf |title=QSFP-DD MSA |date=2024-07-25 |access-date=2024-08-15}}</ref>
 
== QSFP ==
Line 264 ⟶ 263:
''Quad Small Form-factor Pluggable'' (''QSFP'') transceivers are available with a variety of transmitter and receiver types, allowing users to select the appropriate transceiver for each link to provide the required ''optical reach'' over [[multi-mode fiber|multi-mode]] or [[single-mode fiber]].
 
; {{nowrap|4&nbsp; Gbit/s}}: The original QSFP document specified four channels carrying [[Gigabit Ethernet]], 4GFC ([[FiberChannel]]), or DDR [[InfiniBand]].<ref name="inf8438">{{cite web|url=http://ftp.seagate.com/sff/INF-8438.PDF|title=QSFP Public Specification (INF-8438)|last1=SFF Committee|publisher=SFF Committee|page=12|access-date=2016-06-22}}</ref>
; {{nowrap|40&nbsp; Gbit/s}} (QSFP+): QSFP+ is an evolution of QSFP to support four {{nowrap|10&nbsp; Gbit/s}} channels carrying [[10 Gigabit Ethernet]], 10GFC [[FiberChannel]], or QDR [[InfiniBand]].<ref name="sff8436">{{cite web|last1=SFF Committee|title=QSFP+ 10&nbsp;Gbs 4X Pluggable Transceiver (SFF-8436)|url=http://ftp.seagate.com/sff/SFF-8436.PDF|access-date=2016-06-22|page=13}}</ref> The 4 channels can also be combined into a single [[40 Gigabit Ethernet#Connectors|40 Gigabit Ethernet]] link.
; {{nowrap|50&nbsp; Gbit/s}} (QSFP14): The QSFP14 standard is designed to carry FDR [[InfiniBand]], [[Serial Attached SCSI|SAS-3]]<ref>{{cite web|last1=SFF Committee|title=QSFP+ 14&nbsp;Gb/s 4X Pluggable Transceiver Solution (QSFP14)|url=http://ftp.seagate.com/sff/SFF-8685.PDF|access-date=2016-06-22|page=5}}</ref> or 16G Fibre Channel.
; {{nowrap|100&nbsp; Gbit/s}} (QSFP28): The QSFP28 standard<ref name="sff-8665" /> is designed to carry [[100 Gigabit Ethernet]], EDR [[InfiniBand]], or 32G Fibre Channel. Sometimes this transceiver type is also referred to as ''QSFP100'' or ''100G QSFP''<ref>{{Cite web |url=https://www.arista.com/assets/data/pdf/Arista100G_TC_QA.pdf |title=100G Optics and Cabling Q&A Document |website=www.arista.com |publisher=[[Arista Networks]]}}</ref> for sake of simplicity.
; {{nowrap|200&nbsp; Gbit/s}} (QSFP56): QSFP56 is designed to carry [[200 Gigabit Ethernet]], HDR [[InfiniBand]], or 64G Fibre Channel. The biggest enhancement is that QSFP56 uses four-level pulse-amplitude modulation ([[PAM-4]]) instead of [[non-return-to-zero]] (NRZ). It uses the same physical specifications as QSFP28 (SFF-8665), with electrical specifications from SFF-8024<ref name="sff-8024">{{cite web|url=https://members.snia.org/document/dl/26423|title=SFF-8024: Management Interface for Cabled Environments|date=2019-02-14|publisher=SNIA SFF Committee|access-date=2019-04-04|version=4.6}}</ref> and revision 2.10a of SFF-8636.<ref name="sff-8636r2.9.2draft">{{cite web|url=https://members.snia.org/document/dl/26418|title=Management Interface for 4-lane Modules and Cables|date=2019-09-24|series=SFF-8636|publisher=SNIA SFF Committee|access-date=2019-10-11|edition=Rev 2.10a}}</ref> Sometimes this transceiver type is referred to as ''200G QSFP''<ref>{{Cite web|url=https://www.arista.com/assets/data/pdf/Datasheets/Arista-400G_Optics_FAQ.pdf|title=Arista 400G Transceivers and Cables: Q&A|website=www.arista.com|publisher=Arista Networks, Inc.|access-date=2019-04-04}}</ref> for sake of simplicity.
 
Switch and router manufacturers implementing QSFP+ ports in their products frequently allow for the use of a single QSFP+ port as four independent [[10 Gigabit Ethernet]] connections, greatly increasing port density. For example, a typical 24-port QSFP+ [[19-inch rack|1U]] switch would be able to service 96x10GbE connections.<ref>{{Cite web|url=http://www.cisco.com/c/en/us/products/collateral/switches/nexus-5624q-switch/datasheet-c78-733100.html|title=Cisco Nexus 5600 specifications}}</ref><ref>{{Cite web|url=https://www.finisar.com/active-optical-cables/fcbn510qe2cxx|title=Finisar 4 x 10GbE fanout QSFP}}</ref><ref>{{Cite web|url=https://www.arista.com/assets/data/pdf/40G_FAQ.pdf|title=Arista 40Gb port to 4 x 10GbE breakout}}</ref> There also exist fanout cables to adapt a single QSFP28 port to four independent [[25 Gigabit Ethernet]] SFP28 ports (QSFP28-to-4×SFP28)<ref>{{Cite web|url=http://www.prolabs.com/products/direct-attach-cables/msa_standard/QSFP28-SFP28/QSFP28-4XSFP28-DAC-3M-NC/|title=QSFP28-to-SFP28 breakout}}</ref> as well as cables to adapt a single QSFP56 port to four independent [[50 Gigabit Ethernet]] SFP56 ports (QSFP56-to-4×SFP56).<ref>{{cite web|url=https://www.te.com/usa-en/product-4-2334236-1.html|title=QSFP56 : 4-2334236-1 Pluggable I/O Cable Assemblies|website=TE Connectivity}}</ref>
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