Small Form-factor Pluggable: Difference between revisions
Artoria2e5 (talk | contribs) |
Artoria2e5 (talk | contribs) The OSFP MSA has a long enough list of companies, some overlapping with SFP and/or QSFP. Let's also call it a sibling. |
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[[file:SFP board 2.jpg|thumb|Small Form-factor Pluggable connected to a pair of [[fiber-optic cable]]s]] |
[[file:SFP board 2.jpg|thumb|Small Form-factor Pluggable connected to a pair of [[fiber-optic cable]]s]] |
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'''Small Form-factor Pluggable''' ('''SFP''') is a compact, [[ |
'''Small Form-factor Pluggable''' ('''SFP''') is a compact, [[hot-pluggable]] network interface module format used for both [[telecommunication]] and [[data communications]] applications. An SFP interface on [[networking hardware]] is a modular slot for a media-specific [[transceiver]], such as for a [[fiber-optic cable]] or a copper cable.<ref name="pcmag"/> The advantage of using SFPs compared to fixed interfaces (e.g. [[modular connector]]s in [[Ethernet switches]]) is that individual ports can be equipped with different types of transceivers as required, with the majority including [[optical line terminal]]s, [[network card]]s, [[Network Switch|switches]] and [[Router (computing)|routers]]. |
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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"/> |
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"/> |
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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 '''SFP28''' iteration is designed for speeds of 25 Gbit/s.<ref name="snia"/> |
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 '''SFP28''' iteration is designed for speeds of 25 Gbit/s.<ref name="snia"/> |
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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. |
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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Both a '''SFP-DD''',<ref name="SFP-DD MSA"/> which allows for 100 Gbit/s over two lanes, as well as a '''QSFP-DD'''<ref name="QSFP-DD MSA"/> specifications, which allows for 400 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> |
Both a '''SFP-DD''',<ref name="SFP-DD MSA"/> which allows for 100 Gbit/s over two lanes, as well as a '''QSFP-DD'''<ref name="QSFP-DD MSA"/> specifications, which allows for 400 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> |
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An |
An even larger sibling, the '''OSFP (Octal Small Format Pluggable)''' has products being 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 800 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 800 Gbit/s via 8×100 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> |
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==SFP types== |
==SFP types== |
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|- |
|- |
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! Name |
! Name |
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!Nominal<br/>speed |
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! Lanes |
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! Standard |
! Standard |
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! Introduced |
! Introduced |
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! Status |
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! Size (mm<sup>2</sup>) |
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! Backward compatible |
! Backward compatible |
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! |
! [[PHY#Ethernet physical transceiver|PHY]] interface |
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! Media |
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! Connector |
! Connector |
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! Max channels |
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! Notes |
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|- |
|- |
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| align="left" | 100 Mbit/s |
| align="left" | SFP |
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|100 Mbit/s |
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| 1 |
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| [[Small Form Factor Committee|SFF]] INF-8074i |
| [[Small Form Factor Committee|SFF]] INF-8074i |
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| 2001-05-01 |
| 2001-05-01 |
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| {{active|current}} |
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| 113.9 |
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| none |
| none |
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| MII |
| MII |
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| Fiber, Twisted Pair |
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| LC, RJ45 |
| LC, RJ45 |
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|- |
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| align="left" | SFP |
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|1 Gbit/s |
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| 1 |
| 1 |
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| |
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|- |
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| align="left" | 1 Gbit/s SFP |
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| [[Small Form Factor Committee|SFF]] INF-8074i |
| [[Small Form Factor Committee|SFF]] INF-8074i |
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| 2001-05-01 |
| 2001-05-01 |
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| {{active|current}} |
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| 113.9 |
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| 100 Mbit/s SFP* |
| 100 Mbit/s SFP* |
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| SGMII |
| SGMII |
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| Fiber, Twisted Pair |
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| LC, RJ45 |
| LC, RJ45 |
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| |
|- |
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| align="left" | cSFP |
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|1 Gbit/s |
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| 2 |
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| |
| |
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|- |
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| align="left" | 1 Gbit/s cSFP |
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| |
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| |
| |
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| {{active|current}} |
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| 113.9 |
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| |
| |
||
| |
| |
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| Fiber |
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| LC |
| LC |
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| 2 |
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| |
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|- |
|- |
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| align="left" |10 Gbit/s |
| align="left" |SFP+ |
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|10 Gbit/s |
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| 1 |
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| [[Small Form Factor Committee|SFF]] SFF-8431 4.1 |
| [[Small Form Factor Committee|SFF]] SFF-8431 4.1 |
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| 2009-07-06 |
| 2009-07-06 |
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| {{active|current}} |
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| 113.9 |
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| SFP |
| SFP |
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| XGMII |
| XGMII |
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| Fiber, Twisted Pair, DAC |
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| LC, RJ45 |
| LC, RJ45 |
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|- |
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| align="left" | SFP28 |
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|25 Gbit/s |
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| 1 |
| 1 |
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| |
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|- |
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| align="left" | 25 Gbit/s SFP28 |
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| [[Small Form Factor Committee|SFF]] SFF-8402 |
| [[Small Form Factor Committee|SFF]] SFF-8402 |
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| 2014-09-13 |
| 2014-09-13 |
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| {{active|current}} |
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| 113.9 |
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| SFP, SFP+ |
| SFP, SFP+ |
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| |
| |
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| Fiber, DAC |
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| LC |
| LC |
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|- |
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| align="left" | SFP56 |
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|50 Gbit/s |
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| 1 |
| 1 |
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| |
| |
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|- |
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| align="left" | 50 Gbit/s SFP56 |
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| |
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| |
| |
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| {{active|current}} |
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| 113.9 |
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| SFP, SFP+, SFP28 |
| SFP, SFP+, SFP28 |
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| |
| |
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| Fiber, DAC |
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| LC |
| LC |
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| 1 |
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| |
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|- |
|- |
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| align="left" | SFP-DD |
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<!-- DD family --> |
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|100 Gbit/s |
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|- |
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| 2 |
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| align="left" | 100 Gbit/s SFP-DD |
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| <ref name=sfp-dd.spec/> |
| rowspan="3" | SFP-DD MSA<ref name=sfp-dd.spec/> |
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| 2018-01-26 |
| 2018-01-26 |
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| rowspan=3| Specification published; not yet in use {{as of|2022|08|lc=on}} |
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| 113.9 |
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| SFP, SFP+, SFP28, SFP56 |
| SFP, SFP+, SFP28, SFP56 |
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| |
| |
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| Fiber, DAC |
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| LC |
| LC |
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| 2 |
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| |
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|- |
|- |
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| align="left" | 100 Gbit/s |
| align="left" | SFP112 |
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|100 Gbit/s |
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| 1 |
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| <ref name=sfp-dd.spec/> |
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| 2018-01-26 |
| 2018-01-26 |
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| 113.9 |
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| SFP, SFP+, SFP28, SFP56 |
| SFP, SFP+, SFP28, SFP56 |
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| |
| |
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| Fiber, DAC |
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| LC |
| LC |
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| 1 |
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| |
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|- |
|- |
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| align="left" | 200 Gbit/s |
| align="left" | SFP-DD112 |
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|200 Gbit/s |
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| 2 |
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| <ref name=sfp-dd.spec/> |
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| 2018-01-26 |
| 2018-01-26 |
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| 113.9 |
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| SFP, SFP+, SFP28, SFP56, SFP-DD, SFP112 |
| SFP, SFP+, SFP28, SFP56, SFP-DD, SFP112 |
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| |
| |
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| Fiber, DAC |
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| LC |
| LC |
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| 2 |
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| |
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|- |
|- |
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! colspan="8" | QSFP types |
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<!---https://www.snia.org/technology-communities/sff/specifications?field_doc_status_value=All&combine=sfp&items_per_page=40--> |
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|- |
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| align="left" | 4 Gbit/s QSFP |
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| align="left" | QSFP |
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| 4 Gbit/s |
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| 4 |
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| [[Small Form Factor Committee|SFF]] INF-8438 |
| [[Small Form Factor Committee|SFF]] INF-8438 |
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| 2006-11-01 |
| 2006-11-01 |
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| {{active|current}} |
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| 156 |
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| none |
| none |
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| GMII |
| GMII |
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| |
| |
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| |
|- |
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| align="left" | QSFP+ |
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|40 Gbit/s |
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| 4 |
| 4 |
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| |
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|- |
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| align="left" | 40 Gbit/s QSFP+ |
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| [[Small Form Factor Committee|SFF]] SFF-8436 |
| [[Small Form Factor Committee|SFF]] SFF-8436 |
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| 2012-04-01 |
| 2012-04-01 |
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| {{active|current}} |
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| 156 |
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| none |
| none |
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| XGMII |
| XGMII |
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| Fiber, DAC |
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| LC, MTP/MPO |
| LC, MTP/MPO |
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| 4 |
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| CWDM |
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|- |
|- |
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| align="left" | 50 Gbit/s |
| align="left" | QSFP28 |
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|50 Gbit/s |
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| 2 |
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| [[Small Form Factor Committee|SFF]] SFF-8665 |
| [[Small Form Factor Committee|SFF]] SFF-8665 |
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| 2014-09-13 |
| 2014-09-13 |
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| {{active|current}} |
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| 156 |
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| QSFP+ |
| QSFP+ |
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| |
| |
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| Fiber, DAC |
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| LC |
| LC |
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| 2 |
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| |
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|- |
|- |
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| align="left" | 100 Gbit/s |
| align="left" | QSFP28 |
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|100 Gbit/s |
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| 4 |
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| [[Small Form Factor Committee|SFF]] SFF-8665 |
| [[Small Form Factor Committee|SFF]] SFF-8665 |
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| 2014-09-13 |
| 2014-09-13 |
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| {{active|current}} |
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| 156 |
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| QSFP+ |
| QSFP+ |
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| |
| |
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| Fiber, DAC |
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| LC, {{nowrap|MTP/MPO-12}} |
| LC, {{nowrap|MTP/MPO-12}} |
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| 4 |
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| CWDM |
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|- |
|- |
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| align="left" | 200 Gbit/s |
| align="left" | QSFP56 |
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|200 Gbit/s |
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| 4 |
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| [[Small Form Factor Committee|SFF]] SFF-8665 |
| [[Small Form Factor Committee|SFF]] SFF-8665 |
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| 2015-06-29 |
| 2015-06-29 |
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| {{active|current}} |
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| 156 |
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| QSFP+, QSFP28 |
| QSFP+, QSFP28 |
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| |
| |
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| Fiber, DAC |
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| LC, {{nowrap|MTP/MPO-12}} |
| LC, {{nowrap|MTP/MPO-12}} |
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|- |
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| align="left" | QSFP112 |
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|400 Gbit/s |
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| 4 |
| 4 |
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| [[Small Form Factor Committee|SFF]] SFF-8665 |
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| 2015-06-29 |
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| QSFP+, QSFP28, QSFP56 |
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| |
| |
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| LC, {{nowrap|MTP/MPO-12}} |
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|- |
|- |
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| align="left" | 400 Gbit/s |
| align="left" | QSFP-DD |
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|400 Gbit/s |
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| 8 |
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| [[Small Form Factor Committee|SFF]] INF-8628 |
| [[Small Form Factor Committee|SFF]] INF-8628 |
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| 2016-06-27 |
| 2016-06-27 |
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| {{active|current}} |
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| 156 |
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| QSFP+, QSFP28,<ref name="Cisco-400G_QSFP-DD">{{cite web |title=Cisco 400G QSFP-DD Cable and Transceiver Modules Data Sheet |url=https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/datasheet-c78-743172.html |website=Cisco |access-date=2020-03-27 |language=en}}</ref> QSFP56 |
| QSFP+, QSFP28,<ref name="Cisco-400G_QSFP-DD">{{cite web |title=Cisco 400G QSFP-DD Cable and Transceiver Modules Data Sheet |url=https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/transceiver-modules/datasheet-c78-743172.html |website=Cisco |access-date=2020-03-27 |language=en}}</ref> QSFP56 |
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| |
| |
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| Fiber, DAC |
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| LC, {{nowrap|MTP/MPO-16}} |
| LC, {{nowrap|MTP/MPO-16}} |
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| 8 |
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| CWDM |
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|- |
|- |
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|} |
|} |
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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. |
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. |
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=== 100 |
=== 100 Mbit/s SFP === |
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<!--Information below would probably be better presented as a table--> |
<!--Information below would probably be better presented as a table--> |
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<!--https://members.snia.org/document/dl/26184--> |
<!--https://members.snia.org/document/dl/26184--> |
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* Multi-mode fiber, [[LC connector]], with '''{{fontcolour|blue|#f1f5fc|blue}}''' color coding |
* Multi-mode fiber, [[LC connector]], with '''{{fontcolour|blue|#f1f5fc|blue}}''' color coding |
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** '''[[Fast Ethernet#100BASE-FX|FX]]''' {{snd}}1300 nm, for a distance up to 5 km. |
** '''[[Fast Ethernet#100BASE-FX|FX]]''' {{snd}}1300 nm, for a distance up to 5 km. |
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** '''[[Fast Ethernet#100BASE-LFX|LFX]]''' |
** '''[[Fast Ethernet#100BASE-LFX|LFX]]''' (name dependent on manufacturer){{snd}}1310 nm, for a distance up to 5 km. |
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* Single-mode fiber, LC connector, with '''{{fontcolour|blue|#f1f5fc|blue}}''' color coding |
* Single-mode fiber, LC connector, with '''{{fontcolour|blue|#f1f5fc|blue}}''' color coding |
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** '''[[Fast Ethernet#100BASE-LX|LX]]'''{{snd}}1310 nm, for distances up to 10 km |
** '''[[Fast Ethernet#100BASE-LX|LX]]'''{{snd}}1310 nm, for distances up to 10 km |
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=== 1 Gbit/s SFP === |
=== 1 Gbit/s SFP === |
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<!--Information below would probably be better presented as a table--> |
<!--Information below would probably be better presented as a table--> |
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* 1 Gbit/s multi-mode fiber, [[LC connector]], with black or beige extraction lever<ref name="sfpmsa"/> |
* 1 to 1.25 Gbit/s multi-mode fiber, [[LC connector]], with black or beige extraction lever<ref name="sfpmsa"/> |
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** '''SX'''{{snd}}850 nm, for a maximum of 550 m at 1.25 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> |
** '''SX'''{{snd}}850 nm, for a maximum of 550 m at 1.25 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> |
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* 1.25 |
* 1 to 1.25 Gbit/s multi-mode fiber, [[LC connector]], extraction lever colors not standardized |
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** '''SX+/MX/LSX''' |
** '''SX+/MX/LSX/LX''' (name dependent on manufacturer){{snd}}1310 nm, for a distance up to 2 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. |
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* 1 to 2.5 |
* 1 to 2.5 Gbit/s single-mode fiber, LC connector, with blue extraction lever<ref name="sfpmsa"/> |
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** '''LX'''{{snd}}1310 nm, for distances up to 10 km (originally, '''LX''' just covered 5 km and '''LX10''' for 10 km followed later) |
** '''LX'''{{snd}}1310 nm, for distances up to 10 km (originally, '''LX''' just covered 5 km and '''LX10''' for 10 km followed later) |
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** '''EX'''{{snd}}1310 nm, for distances up to 40 km |
** '''EX'''{{snd}}1310 nm, for distances up to 40 km |
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** '''ZX'''{{snd}}1550 nm, for distances up to 80 km (depending on fiber path loss), with green extraction lever (see GLC-ZX-SM1) |
** '''ZX'''{{snd}}1550 nm, for distances up to 80 km (depending on fiber path loss), with green extraction lever (see GLC-ZX-SM1) |
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** '''EZX'''{{snd}}1550 nm, for distances up to 160 km (depending on fiber path loss) |
** '''EZX'''{{snd}}1550 nm, for distances up to 160 km (depending on fiber path loss) |
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** '''BX''' (officially '''BX10'''){{snd}}1490 nm/1310 nm, Single Fiber Bi-Directional Gigabit SFP Transceivers, paired as '''BX-U''' and '''BX-D''' for uplink and downlink respectively, also for distances up to 10 km.<ref>{{citation|title=Single Fiber Bidirectional SFP Transceiver|url=http://www.interlinkweb.com/systemics/assets/product_images/mrv/MRV-OP-SFPB_A4_HI-1.pdf|archive-url=https://web.archive.org/web/20160419114354/http://www.interlinkweb.com/systemics/assets/product_images/mrv/MRV-OP-SFPB_A4_HI-1.pdf|archive-date=2016-04-19|publisher=MRV}}</ref><ref>{{citation|url=http://yamasakiot.com/yamasaki-sfp-transceivers |title=Gigabit Bidirectional SFPs |publisher=Yamasaki Optical Technology}}</ref> |
** '''BX''' (officially '''BX10'''){{snd}}1490 nm/1310 nm, Single Fiber Bi-Directional Gigabit SFP Transceivers, paired as '''BX-U''' and '''BX-D''' for uplink and downlink respectively, also for distances up to 10 km.<ref>{{citation|title=Single Fiber Bidirectional SFP Transceiver|url=http://www.interlinkweb.com/systemics/assets/product_images/mrv/MRV-OP-SFPB_A4_HI-1.pdf|archive-url=https://web.archive.org/web/20160419114354/http://www.interlinkweb.com/systemics/assets/product_images/mrv/MRV-OP-SFPB_A4_HI-1.pdf|archive-date=2016-04-19|publisher=MRV}}</ref><ref>{{citation|url=http://yamasakiot.com/yamasaki-sfp-transceivers |title=Gigabit Bidirectional SFPs |publisher=Yamasaki Optical Technology}}</ref> Variations of bidirectional SFPs are also manufactured which use 1550 nm in one direction, and higher transmit power versions with link length capabilities up to 80 km. |
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** 1550 nm 40 km ('''XD'''), 80 km ('''ZX'''), 120 km ('''EX''' or '''EZX''') |
** 1550 nm 40 km ('''XD'''), 80 km ('''ZX'''), 120 km ('''EX''' or '''EZX''') |
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** '''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}}</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> |
** '''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> |
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** [[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 km. |
** [[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 km. |
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* 1 |
* 1 Gbit/s for copper twisted-pair cabling, [[RJ45 (telecommunications)|8P8C]] (RJ-45) connector |
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** [[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 non-SFP, copper 1000BASE-T ports integrated into most routers and switches, 1000BASE-T SFPs usually cannot operate at [[100BASE-TX]] speeds. |
** [[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. |
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* 100 Mbit/s copper and optical{{snd}}some vendors have shipped 100 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 100 Mbit/s SFPs.<ref>{{Cite web|url=http://www.fs.com/c/100base-sfp_1668|title=Fiberstore: 100 M SFPs}}</ref> |
* 100 Mbit/s copper and optical{{snd}}some vendors have shipped 100 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 100 Mbit/s SFPs.<ref>{{Cite web|url=http://www.fs.com/c/100base-sfp_1668|title=Fiberstore: 100 M SFPs}}</ref> |
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* Although it is not mentioned in any official specification document the maximum data rate of the original SFP standard is 5 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> |
* Although it is not mentioned in any official specification document the maximum data rate of the original SFP standard is 5 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. |
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*In recent years,{{when|date=January 2020}} SFP transceivers have been created that will allow [[2.5GBASE-T and 5GBASE-T|2.5 Gbit/s and 5 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> |
*In recent years,{{when|date=January 2020}} SFP transceivers have been created that will allow [[2.5GBASE-T and 5GBASE-T|2.5 Gbit/s and 5 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> |
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[[File:10_Gbit_XFP_and_SFP_transceivers.jpg|thumb|350px|right|A [[10 Gigabit Ethernet]] [[XFP transceiver]], ''top'', and a SFP+ transceiver, ''bottom'']] |
[[File:10_Gbit_XFP_and_SFP_transceivers.jpg|thumb|350px|right|A [[10 Gigabit Ethernet]] [[XFP transceiver]], ''top'', and a SFP+ transceiver, ''bottom'']] |
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The '''SFP+''' ('''enhanced small form-factor pluggable''') is an enhanced version of the SFP that supports data rates up to 16 [[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:// |
The '''SFP+''' ('''enhanced small form-factor pluggable''') is an enhanced version of the SFP that supports data rates up to 16 [[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 8 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 16 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 16 Gbit/s Fibre Channel is the encoding method. The [[64b/66b encoding]] used for 16 Gbit/s is a more efficient encoding mechanism than [[8b/10b encoding|8b/10b]] used for 8 Gbit/s, and allows for the data rate to double without doubling the line rate. 16GFC doesn't really use 16 Gbit/s signaling anywhere. It uses a 14.025 Gbit/s line rate to achieve twice the throughput of 8GFC.<ref>{{cite web |
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|title = Roadmaps |
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|url = https://fibrechannel.org/roadmap/ |
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|publisher = Fibre Channel Industry Association |
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|access-date = 2023-03-05 |
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}}</ref> |
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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 m), active (up to 15 m), and active optical (AOC, up to 100 m) variants. |
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 m), active (up to 15 m), and active optical (AOC, up to 100 m) variants. |
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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> |
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> |
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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= |
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> |
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=== 25 |
=== 25 Gbit/s SFP28 === |
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SFP28 is a 25 Gbit/s interface which evolved from the [[100 Gigabit Ethernet]] interface which is typically implemented with 4 by 25 Gbit/s data lanes. Identical in mechanical dimensions to SFP and SFP+, SFP28 implements one 28 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 25 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 is a 25 Gbit/s interface which evolved from the [[100 Gigabit Ethernet]] interface which is typically implemented with 4 by 25 Gbit/s data lanes. Identical in mechanical dimensions to SFP and SFP+, SFP28 implements one 28 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 25 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> |
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SFP-DD uses two lanes to transmit. |
SFP-DD uses two lanes to transmit. |
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Currently, the following speeds are defined:<ref name=sfp-dd.spec>{{cite web |author=SFP-DD MSA|title=SFP-DD/SFP-DD112/SFP112 Hardware Specification for SFP112 AND SFP DOUBLE DENSITY PLUGGABLE TRANSCEIVER Revision 5.1 |url=http://sfp-dd.com/wp-content/uploads/2022/03/SFP-DDrev5.1.pdf |date=March 11, 2022}}</ref> |
Currently, the following speeds are defined: |
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* SFP112: {{val|100|u=Gbit/s}} using PAM4 on a single pair (not double density)<ref name=sfp-dd.spec>{{cite web |author=SFP-DD MSA|title=SFP-DD/SFP-DD112/SFP112 Hardware Specification for SFP112 AND SFP DOUBLE DENSITY PLUGGABLE TRANSCEIVER Revision 5.1 |url=http://sfp-dd.com/wp-content/uploads/2022/03/SFP-DDrev5.1.pdf |date=March 11, 2022}}</ref> |
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* SFP-DD: {{val|100|u=Gbit/s}} using PAM4 and {{val|50|u=Gbit/s}} using NRZ<ref name=sfp-dd.spec/> |
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* SFP112: not double density: 100Gbit/s using PAM4 on a single pair |
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* SFP- |
* SFP-DD112: {{val|200|u=Gbit/s}} using PAM4<ref name=sfp-dd.spec/> |
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* QSFP112: {{val|400|u=Gbit/s}} (4 × {{val|112|u=Gbit/s}})<ref name=qsfp-dd.msa>{{cite web |last1=QSFP-DD MSA |title=QSFP-DD/QSFP-DD800/QSFP112 Hardware Specification for QSFP DOUBLE DENSITY 8X AND QSFP 4X PLUGGABLE TRANSCEIVERS Revision 6.3 |url=http://www.qsfp-dd.com/wp-content/uploads/2022/07/QSFP-DD-Hardware-Rev6.3-final.pdf |date=July 26, 2022}}</ref> |
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* SFP-DD112: 200Gbit/s using PAM4 |
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* 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}}) |
* 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> |
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* QSFP-DD112: {{val|800|u=Gbit/s}} (8 × {{val|112|u=Gbit/s}}) |
* QSFP-DD800 (formerly QSFP-DD112): {{val|800|u=Gbit/s}} (8 × {{val|112|u=Gbit/s}})<ref name=qsfp-dd.msa/> |
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== QSFP == |
== QSFP == |
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''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]]. |
''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]]. |
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; 4 |
; 4 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> |
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; 40 |
; 40 Gbit/s (QSFP+): QSFP+ is an evolution of QSFP to support four 10 Gbit/s channels carrying [[10 Gigabit Ethernet]], 10GFC [[FiberChannel]], or QDR [[InfiniBand]].<ref name="sff8436">{{cite web|last1=SFF Committee|title=QSFP+ 10 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. |
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; 50 |
; 50 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 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. |
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; 100 |
; 100 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. |
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; 200 |
; 200 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 |
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> |
||
==Applications== |
==Applications== |
||
[[Image:Brocade FES24 Front.jpg|thumb|400px|Ethernet switch with two empty SFP slots (lower left)]] |
[[Image:Brocade FES24 Front.jpg|thumb|400px|Ethernet switch with two empty SFP slots (lower left)]] |
||
SFP sockets are found in [[Ethernet switch]]es, routers, firewalls and [[network interface card]]s. They are used in Fibre Channel [[host adapter]]s and storage equipment. Because of their low cost, low profile, and ability to provide a connection to different types of optical fiber, SFP provides such equipment with enhanced flexibility. |
SFP sockets are found in [[Ethernet switch]]es, routers, firewalls and [[network interface card]]s. They are used in Fibre Channel [[host adapter]]s and storage equipment. Because of their low cost, low profile, and ability to provide a connection to different types of optical fiber, SFP provides such equipment with enhanced flexibility. |
||
SFP sockets and transceivers are also used for long-distance [[serial digital interface]] (SDI) transmission.<ref>{{Cite book |title=For Television — Serial Digital Fiber Transmission System for SMPTE 259M, SMPTE 344M, SMPTE 292 and SMPTE 424M Signals |url=https://ieeexplore.ieee.org/document/7290552 |access-date=2024-01-15 |doi=10.5594/SMPTE.ST297.2006 |isbn=978-1-61482-435-0 }}</ref> |
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==Standardization== |
==Standardization== |
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! Standard |
! Standard |
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! Media |
! Media |
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! Wavelength |
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! wavelength |
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! Notes |
! Notes |
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|- |
|- |
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! Color |
! Color |
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! Standard |
! Standard |
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! Wavelength |
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! wavelength |
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! Notes |
! Notes |
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! Color |
! Color |
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! Standard |
! Standard |
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! Wavelength |
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! wavelength |
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! Multiplexing |
! Multiplexing |
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! Notes |
! Notes |
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[[Image:SFP-side.jpg|thumb|right|Side view of SFP module. Depth, the longest dimension, is {{convert|56.5|mm|abbr=on}}.]] |
[[Image:SFP-side.jpg|thumb|right|Side view of SFP module. Depth, the longest dimension, is {{convert|56.5|mm|abbr=on}}.]] |
||
The physical dimensions of the SFP transceiver (and its subsequent faster variants) are narrower than the later QSFP counterparts, which allows for SFP transceivers to be placed in QSFP ports via an inexpensive adapter. |
The physical dimensions of the SFP transceiver (and its subsequent faster variants) are narrower than the later QSFP counterparts, which allows for SFP transceivers to be placed in QSFP ports via an inexpensive adapter. Both are smaller than the [[XFP transceiver]]. |
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{| class="wikitable" |
{| class="wikitable" |
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! colspan=2 | SFP<ref name="sfpmsa" /> |
! colspan=2 | SFP<ref name="sfpmsa" /> |
||
! colspan=2 | QSFP<ref name="inf8438"/> |
! colspan=2 | QSFP<ref name="inf8438"/> |
||
! colspan=2 | XFP<ref name="xfpspec">{{cite web |title= INF-8077i: 10 Gigabit Small Form Factor Pluggable Module |
! colspan=2 | XFP<ref name="xfpspec">{{cite web |title= INF-8077i: 10 Gigabit Small Form Factor Pluggable Module |publisher= Small Form Factor Committee |date= August 31, 2005 |url= https://ta.snia.org/kws/public/download/97/INF-8077.PDF |access-date= 2017-03-16 |archive-date= March 17, 2017 |archive-url= https://web.archive.org/web/20170317055048/https://ta.snia.org/kws/public/download/97/INF-8077.PDF |url-status= dead }}</ref> |
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|- |
|- |
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! mm !! in !! mm !! in !! mm !! in |
! mm !! in !! mm !! in !! mm !! in |
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* [[Optical communication]] |
* [[Optical communication]] |
||
* [[Parallel optical interface]] |
* [[Parallel optical interface]] |
||
* [[C form-factor pluggable]] |
|||
==References== |
==References== |
||
Line 874: | Line 843: | ||
<ref name="SFP-DD MSA">{{Cite web|url=http://sfp-dd.com/|title=SFP-DD MSA}}</ref> |
<ref name="SFP-DD MSA">{{Cite web|url=http://sfp-dd.com/|title=SFP-DD MSA}}</ref> |
||
<ref name="QSFP-DD MSA">{{Cite web|url=http://www.qsfp-dd.com/|title=QSFP-DD MSA}}</ref> |
<ref name="QSFP-DD MSA">{{Cite web|url=http://www.qsfp-dd.com/|title=QSFP-DD MSA}}</ref> |
||
<ref name="Lightwave">{{Cite web|url=http://www.lightwaveonline.com/articles/2016/11/osfp-msa-targets-400-gbps-optical-transceiver-module.html|title=Lightwave Online news article re: 400Gb}}</ref> |
<ref name="Lightwave">{{Cite web|url=http://www.lightwaveonline.com/articles/2016/11/osfp-msa-targets-400-gbps-optical-transceiver-module.html|title=Lightwave Online news article re: 400Gb|date=November 18, 2016 }}</ref> |
||
<ref name="OSFP MSA">{{Cite web|url=http://osfpmsa.org/|title=OSFP MSA}}</ref> |
<ref name="OSFP MSA">{{Cite web|url=http://osfpmsa.org/|title=OSFP MSA}}</ref> |
||
}} |
}} |
Latest revision as of 07:21, 23 May 2024
Small Form-factor Pluggable (SFP) is a compact, hot-pluggable network interface module format used for both telecommunication and data communications applications. An SFP interface on networking hardware is a modular slot for a media-specific transceiver, such as for a fiber-optic cable or a copper cable.[1] The advantage of using SFPs compared to fixed interfaces (e.g. modular connectors in Ethernet switches) is that individual ports can be equipped with different types of transceivers as required, with the majority including optical line terminals, network cards, switches and routers.
The form factor and electrical interface are specified by a multi-source agreement (MSA) under the auspices of the Small Form Factor Committee.[2] The SFP replaced the larger gigabit interface converter (GBIC) in most applications, and has been referred to as a Mini-GBIC by some vendors.[3]
SFP transceivers exist supporting synchronous optical networking (SONET), Gigabit Ethernet, Fibre Channel, 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.[4] In 2006, SFP+ specification brought speeds up to 10 Gbit/s and the SFP28 iteration is designed for speeds of 25 Gbit/s.[5]
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.[6] In 2019, the closely related QSFP56 was standardized[7] doubling the top speeds to 200 Gbit/s with products already selling from major vendors.[8] There are inexpensive adapters allowing SFP transceivers to be placed in a QSFP port.
Both a SFP-DD,[9] which allows for 100 Gbit/s over two lanes, as well as a QSFP-DD[10] specifications, which allows for 400 Gbit/s over eight lanes, have been published.[11] These use a form factor which is directly backward compatible to their respective predecessors.[12]
An even larger sibling, the OSFP (Octal Small Format Pluggable) has products being released in 2022[13] capable of 800 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[14] with the 4.0 version released in 2021 allowing for 800 Gbit/s via 8×100 Gbit/s electrical data lanes.[15] Its proponents say a low-cost adapter will allow for backwards compatibility with QSFP modules.[16]
SFP types[edit]
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 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.
Name | Nominal speed |
Lanes | Standard | Introduced | Backward compatible | PHY interface | Connector |
---|---|---|---|---|---|---|---|
SFP | 100 Mbit/s | 1 | SFF INF-8074i | 2001-05-01 | none | MII | LC, RJ45 |
SFP | 1 Gbit/s | 1 | SFF INF-8074i | 2001-05-01 | 100 Mbit/s SFP* | SGMII | LC, RJ45 |
cSFP | 1 Gbit/s | 2 | LC | ||||
SFP+ | 10 Gbit/s | 1 | SFF SFF-8431 4.1 | 2009-07-06 | SFP | XGMII | LC, RJ45 |
SFP28 | 25 Gbit/s | 1 | SFF SFF-8402 | 2014-09-13 | SFP, SFP+ | LC | |
SFP56 | 50 Gbit/s | 1 | SFP, SFP+, SFP28 | LC | |||
SFP-DD | 100 Gbit/s | 2 | SFP-DD MSA[17] | 2018-01-26 | SFP, SFP+, SFP28, SFP56 | LC | |
SFP112 | 100 Gbit/s | 1 | 2018-01-26 | SFP, SFP+, SFP28, SFP56 | LC | ||
SFP-DD112 | 200 Gbit/s | 2 | 2018-01-26 | SFP, SFP+, SFP28, SFP56, SFP-DD, SFP112 | LC | ||
QSFP types | |||||||
QSFP | 4 Gbit/s | 4 | SFF INF-8438 | 2006-11-01 | none | GMII | |
QSFP+ | 40 Gbit/s | 4 | SFF SFF-8436 | 2012-04-01 | none | XGMII | LC, MTP/MPO |
QSFP28 | 50 Gbit/s | 2 | SFF SFF-8665 | 2014-09-13 | QSFP+ | LC | |
QSFP28 | 100 Gbit/s | 4 | SFF SFF-8665 | 2014-09-13 | QSFP+ | LC, MTP/MPO-12 | |
QSFP56 | 200 Gbit/s | 4 | SFF SFF-8665 | 2015-06-29 | QSFP+, QSFP28 | LC, MTP/MPO-12 | |
QSFP112 | 400 Gbit/s | 4 | SFF SFF-8665 | 2015-06-29 | QSFP+, QSFP28, QSFP56 | LC, MTP/MPO-12 | |
QSFP-DD | 400 Gbit/s | 8 | SFF INF-8628 | 2016-06-27 | QSFP+, QSFP28,[18] QSFP56 | LC, 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.
100 Mbit/s SFP[edit]
- Multi-mode fiber, LC connector, with black or Beige color coding
- SX – 850 nm, for a maximum of 550 m
- Multi-mode fiber, LC connector, with blue color coding
- Single-mode fiber, LC connector, with blue color coding
- Single-mode fiber, LC connector, with green color coding
- ZX – 1550 nm, for distances up to 80 km, (depending on fiber path loss)
- EZX – 1550 nm, for distances up to 160 km (depending on fiber path loss)
- Single-mode fiber, LC connector, Bi-Directional, with blue and yellow color coding
- BX (officially BX10) – 1550 nm/1310 nm, Single Fiber Bi-Directional 100 Mbit SFP Transceivers, paired as BX-U (blue) and BX-D (yellow) for uplink and downlink respectively, also for distances up to 10 km. Variations of bidirectional SFPs are also manufactured which higher transmit power versions with link length capabilities up to 40 km.
- Copper twisted-pair cabling, 8P8C (RJ-45) connector
- 100BASE-TX – for distances up to 100m.
1 Gbit/s SFP[edit]
- 1 to 1.25 Gbit/s multi-mode fiber, LC connector, with black or beige extraction lever[2]
- SX – 850 nm, for a maximum of 550 m at 1.25 Gbit/s (gigabit Ethernet). Other multi-mode SFP applications support even higher rates at shorter distances.[19]
- 1 to 1.25 Gbit/s multi-mode fiber, LC connector, extraction lever colors not standardized
- SX+/MX/LSX/LX (name dependent on manufacturer) – 1310 nm, for a distance up to 2 km.[20] 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 2.5 Gbit/s single-mode fiber, LC connector, with blue extraction lever[2]
- LX – 1310 nm, for distances up to 10 km (originally, LX just covered 5 km and LX10 for 10 km followed later)
- EX – 1310 nm, for distances up to 40 km
- ZX – 1550 nm, for distances up to 80 km (depending on fiber path loss), with green extraction lever (see GLC-ZX-SM1)
- EZX – 1550 nm, for distances up to 160 km (depending on fiber path loss)
- BX (officially BX10) – 1490 nm/1310 nm, Single Fiber Bi-Directional Gigabit SFP Transceivers, paired as BX-U and BX-D for uplink and downlink respectively, also for distances up to 10 km.[21][22] Variations of bidirectional SFPs are also manufactured which use 1550 nm in one direction, and higher transmit power versions with link length capabilities up to 80 km.
- 1550 nm 40 km (XD), 80 km (ZX), 120 km (EX or EZX)
- SFSW – single-fiber single-wavelength transceivers, for bi-directional traffic on a single fiber. Coupled with CWDM, these double the traffic density of fiber links.[23][24]
- 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 km.
- 1 Gbit/s for copper twisted-pair cabling, 8P8C (RJ-45) connector
- 1000BASE-T – these modules incorporate significant interface circuitry for Physical Coding Sublayer recoding[25] 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.
- 100 Mbit/s copper and optical – some vendors have shipped 100 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 100 Mbit/s SFPs.[26]
- Although it is not mentioned in any official specification document the maximum data rate of the original SFP standard is 5 Gbit/s.[27] This was eventually used by both 4GFC Fibre Channel and the DDR Infiniband especially in its four-lane QSFP form.
- In recent years,[when?] SFP transceivers have been created that will allow 2.5 Gbit/s and 5 Gbit/s Ethernet speeds with SFPs with 2.5GBASE-T[28] and 5GBASE-T.[29]
10 Gbit/s SFP+[edit]
The SFP+ (enhanced small form-factor pluggable) is an enhanced version of the SFP that supports data rates up to 16 Gbit/s. The SFP+ specification was first published on May 9, 2006, and version 4.1 was published on July 6, 2009.[30] SFP+ supports 8 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 16 Gbit/s Fibre Channel, it can be used at this speed.[31] Besides the data rate, the major difference between 8 and 16 Gbit/s Fibre Channel is the encoding method. The 64b/66b encoding used for 16 Gbit/s is a more efficient encoding mechanism than 8b/10b used for 8 Gbit/s, and allows for the data rate to double without doubling the line rate. 16GFC doesn't really use 16 Gbit/s signaling anywhere. It uses a 14.025 Gbit/s line rate to achieve twice the throughput of 8GFC.[32]
SFP+ also introduces direct attach for connecting two SFP+ ports without dedicated transceivers. Direct attach cables (DAC) exist in passive (up to 7 m), active (up to 15 m), and active optical (AOC, up to 100 m) variants.
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 cards. 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.[33] Through the use of an active electronic adapter, SFP+ modules may be used in older equipment with XENPAK ports [34] and X2 ports.[35][36]
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 10GBASE-LRM; otherwise, limiting modules are preferred.[37]
25 Gbit/s SFP28[edit]
SFP28 is a 25 Gbit/s interface which evolved from the 100 Gigabit Ethernet interface which is typically implemented with 4 by 25 Gbit/s data lanes. Identical in mechanical dimensions to SFP and SFP+, SFP28 implements one 28 Gbit/s lane[38] accommodating 25 Gbit/s of data with encoding overhead.[39]
SFP28 modules exist supporting single-[40] or multi-mode[41] fiber connections, active optical cable[42] and direct attach copper.[43][44]
cSFP[edit]
The compact small form-factor pluggable (cSFP) is a version of SFP with the same mechanical form factor allowing two independent bidirectional channels per port. It is used primarily to increase port density and decrease fiber usage per port.[45][46]
SFP-DD[edit]
The small form-factor pluggable double density (SFP-DD) multi-source agreement is a standard published in 2019 for doubling port density. According to the SFD-DD MSA website: "Network equipment based on the SFP-DD will support legacy SFP modules and cables, and new double density products."[47] SFP-DD uses two lanes to transmit.
Currently, the following speeds are defined:
- SFP112: 100 Gbit/s using PAM4 on a single pair (not double density)[17]
- SFP-DD: 100 Gbit/s using PAM4 and 50 Gbit/s using NRZ[17]
- SFP-DD112: 200 Gbit/s using PAM4[17]
- QSFP112: 400 Gbit/s (4 × 112 Gbit/s)[48]
- QSFP-DD: 400 Gbit/s/200 Gbit/s (8 × 50 Gbit/s and 8 × 25 Gbit/s)[49]
- QSFP-DD800 (formerly QSFP-DD112): 800 Gbit/s (8 × 112 Gbit/s)[48]
QSFP[edit]
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 or single-mode fiber.
- 4 Gbit/s
- The original QSFP document specified four channels carrying Gigabit Ethernet, 4GFC (FiberChannel), or DDR InfiniBand.[50]
- 40 Gbit/s (QSFP+)
- QSFP+ is an evolution of QSFP to support four 10 Gbit/s channels carrying 10 Gigabit Ethernet, 10GFC FiberChannel, or QDR InfiniBand.[51] The 4 channels can also be combined into a single 40 Gigabit Ethernet link.
- 50 Gbit/s (QSFP14)
- The QSFP14 standard is designed to carry FDR InfiniBand, SAS-3[52] or 16G Fibre Channel.
- 100 Gbit/s (QSFP28)
- The QSFP28 standard[6] 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[53] for sake of simplicity.
- 200 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[54] and revision 2.10a of SFF-8636.[7] Sometimes this transceiver type is referred to as 200G QSFP[55] 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+ 1U switch would be able to service 96x10GbE connections.[56][57][58] There also exist fanout cables to adapt a single QSFP28 port to four independent 25 Gigabit Ethernet SFP28 ports (QSFP28-to-4×SFP28)[59] as well as cables to adapt a single QSFP56 port to four independent 50 Gigabit Ethernet SFP56 ports (QSFP56-to-4×SFP56).[60]
Applications[edit]
SFP sockets are found in Ethernet switches, routers, firewalls and network interface cards. They are used in Fibre Channel host adapters and storage equipment. Because of their low cost, low profile, and ability to provide a connection to different types of optical fiber, SFP provides such equipment with enhanced flexibility.
SFP sockets and transceivers are also used for long-distance serial digital interface (SDI) transmission.[61]
Standardization[edit]
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.[62] Third-party SFP manufacturers have introduced SFPs with EEPROMs which may be programmed to match any vendor ID.[63]
Color coding of SFP[edit]
Color coding of SFP[edit]
Color | Standard | Media | Wavelength | Notes |
---|---|---|---|---|
Black |
INF-8074 | Multimode | 850 nm | |
Beige | INF-8074 | Multimode | 850 nm | |
Black |
INF-8074 | Multimode | 1300 nm | |
Blue |
INF-8074 | Singlemode | 1310 nm | |
Red | proprietary (non SFF) |
Singlemode | 1310 nm | Used on 25GBASE-ER[64] |
Green | proprietary (non SFF) |
Singlemode | 1550 nm | Used on 100BASE-ZE |
Red | proprietary (non SFF) |
Singlemode | 1550 nm | Used on 10GBASE-ER |
White | proprietary (non SFF) |
Singlemode | 1550 nm | Used on 10GBASE-ZR |
Color coding of CWDM SFP [65][edit]
Color | Standard | Wavelength | Notes |
---|---|---|---|
Grey | 1270 nm | ||
Grey | 1290 nm | ||
Grey | 1310 nm | ||
Violet | 1330 nm | ||
Blue | 1350 nm | ||
Green | 1370 nm | ||
Yellow | 1390 nm | ||
Orange | 1410 nm | ||
Red | 1430 nm | ||
Brown | 1450 nm | ||
Grey | 1470 nm | ||
Violet | 1490 nm | ||
Blue | 1510 nm | ||
Green | 1530 nm | ||
Yellow | 1550 nm | ||
Orange | 1570 nm | ||
Red | 1590 nm | ||
Brown | 1610 nm |
Color coding of BiDi SFP[edit]
Name | Standard | Side A Color TX | Side A wavelength TX | Side B Color TX | Side B wavelength TX | Notes |
---|---|---|---|---|---|---|
1000BASE-BX | Blue | 1310 nm | Purple | 1490 nm | ||
1000BASE-BX | Blue | 1310 nm | Yellow | 1550 nm | ||
10GBASE-BX 25GBASE-BX |
Blue | 1270 nm | Red | 1330 nm | ||
10GBASE-BX | White | 1490 nm | White | 1550 nm |
Color coding of QSFP[edit]
Color | Standard | Wavelength | Multiplexing | Notes |
---|---|---|---|---|
Beige | INF-8438 | 850 nm | No | |
Blue | INF-8438 | 1310 nm | No | |
White | INF-8438 | 1550 nm | No |
Signals[edit]
SFP transceivers are right-handed: From their perspective, they transmit on the right and receive on the left. When looking into the optical connectors, transmission comes from the left and reception is on the right.[66]
The SFP transceiver contains a printed circuit board with an edge connector with 20 pads that mate on the rear with the SFP electrical connector in the host system. The QSFP has 38 pads including 4 high-speed transmit data pairs and 4 high-speed receive data pairs.[50][51]
Pad | Name | Function |
---|---|---|
1 | VeeT | Transmitter ground |
2 | Tx_Fault | Transmitter fault indication |
3 | Tx_Disable | Optical output disabled when high |
4 | SDA | 2-wire serial interface data line (using the CMOS EEPROM protocol defined for the ATMEL AT24C01A/02/04 family[67]) |
5 | SCL | 2-wire serial interface clock |
6 | Mod_ABS | Module absent, connection to VeeT or VeeR in the module indicates module presence to host |
7 | RS0 | Rate select 0 |
8 | Rx_LOS | Receiver loss of signal indication |
9 | RS1 | Rate select 1 |
10 | VeeR | Receiver ground |
11 | VeeR | Receiver ground |
12 | RD- | Inverted received data |
13 | RD+ | Received data |
14 | VeeR | Receiver ground |
15 | VccR | Receiver power (3.3 V, max. 300 mA) |
16 | VccT | Transmitter power (3.3 V, max. 300 mA) |
17 | VeeT | Transmitter ground |
18 | TD+ | Transmit data |
19 | TD- | Inverted transmit data |
20 | VeeT | Transmitter ground |
Pad | Name | Function |
---|---|---|
1 | GND | Ground |
2 | Tx2n | Transmitter inverted data input |
3 | Tx2p | Transmitter non-inverted data input |
4 | GND | Ground |
5 | Tx4n | Transmitter inverted data input |
6 | Tx4p | Transmitter non-inverted data input |
7 | GND | Ground |
8 | ModSelL | Module select |
9 | ResetL | Module reset |
10 | Vcc-Rx | +3.3 V receiver power supply |
11 | SCL | Two-wire serial interface clock |
12 | SDA | Two-wire serial interface data |
13 | GND | Ground |
14 | Rx3p | Receiver non-inverted data output |
15 | Rx3n | Receiver inverted data output |
16 | GND | Ground |
17 | Rx1p | Receiver non-inverted data output |
18 | Rx1n | Receiver inverted data output |
19 | GND | Ground |
20 | GND | Ground |
21 | Rx2n | Receiver inverted data output |
22 | Rx2p | Receiver non-inverted data output |
23 | GND | Ground |
24 | Rx4n | Receiver inverted data output |
25 | Rx4p | Receiver non-inverted data output |
26 | GND | Ground |
27 | ModPrsL | Module present |
28 | IntL | Interrupt |
29 | Vcc-Tx | +3.3 V transmitter power supply |
30 | Vcc1 | +3.3 V power supply |
31 | LPMode | Low power mode |
32 | GND | Ground |
33 | Tx3p | Transmitter non-inverted data input |
34 | Tx3n | Transmitter inverted data input |
35 | GND | Ground |
36 | Tx1p | Transmitter non-inverted data input |
37 | Tx1n | Transmitter inverted data input |
38 | GND | Ground |
Mechanical dimensions[edit]
The physical dimensions of the SFP transceiver (and its subsequent faster variants) are narrower than the later QSFP counterparts, which allows for SFP transceivers to be placed in QSFP ports via an inexpensive adapter. Both are smaller than the XFP transceiver.
SFP[2] | QSFP[50] | XFP[68] | ||||
---|---|---|---|---|---|---|
mm | in | mm | in | mm | in | |
Height | 8.5 | 0.33 | 8.5 | 0.33 | 8.5 | 0.33 |
Width | 13.4 | 0.53 | 18.35 | 0.722 | 18.35 | 0.722 |
Depth | 56.5 | 2.22 | 72.4 | 2.85 | 78.0 | 3.07 |
EEPROM information[edit]
The SFP MSA defines a 256-byte memory map into an EEPROM describing the transceiver's capabilities, standard interfaces, manufacturer, and other information, which is accessible over a serial I²C interface at the 8-bit address 0b1010000X (0xA0).[69]
Digital diagnostics monitoring[edit]
Modern optical SFP transceivers support standard digital diagnostics monitoring (DDM) functions.[70] This feature is also known as digital optical monitoring (DOM). This capability allows monitoring of the SFP operating parameters in real time. Parameters include optical output power, optical input power, temperature, laser bias current, and transceiver supply voltage. In network equipment, this information is typically made available via Simple Network Management Protocol (SNMP). A DDM interface allows end users to display diagnostics data and alarms for optical fiber transceivers and can be used to diagnose why a transceiver is not working.
See also[edit]
References[edit]
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With the 800G spec completed, group is developing specification for 1600G modules
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- ^ http://sfp-dd.com/ SFP-DD MSA
- ^ a b QSFP-DD MSA (July 26, 2022). "QSFP-DD/QSFP-DD800/QSFP112 Hardware Specification for QSFP DOUBLE DENSITY 8X AND QSFP 4X PLUGGABLE TRANSCEIVERS Revision 6.3" (PDF).
- ^ SFF INF-8628
- ^ a b c d SFF Committee. "QSFP Public Specification (INF-8438)" (PDF). SFF Committee. p. 12. Retrieved June 22, 2016.
- ^ a b SFF Committee. "QSFP+ 10 Gbs 4X Pluggable Transceiver (SFF-8436)" (PDF). p. 13. Retrieved June 22, 2016.
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External links[edit]