Editing Fast Ethernet (section)

== Fiber optics ==
Fiber variants use [[fiber-optic cable]] with the listed interface types. Interfaces may be fixed or modular, often as [[small form-factor pluggable]] (SFP).

{{Fibre legend}}

{| class="wikitable" style="line-height:110%;"
|-
! Name
! Standard
! Status
! style="width: 170px;" | Media
! Connector
! <small>Transceiver<br />Module</small>
! Reach<br />in m
! <small>#<br/>{{tooltip|Media|Number of physical media (wires/fibers) needed for bidirectional traffic}}<br/>(⇆)</small>
! <small>#<br/>{{tooltip|Lambdas|Number of wavelengths used in each direction}}<br/>(→)</small>
! <small>#<br/>{{tooltip|Lanes|Number of lanes (on the wire/fiber) in each direction}}<br/>(→)</small>
! Notes
|-
| colspan="11" {{partial|'''Fast Ethernet''' – <small>([[Data signaling rate|Data rate]]: {{nowrap|100 Mbit/s}} – [[Line code]]: [[4B5B]] × [[NRZI]] – Line rate: 125&nbsp;[[MBd]] – Full-Duplex / Half-Duplex)</small>}}
|-
| rowspan="3" | {{nowrap|[[Fast Ethernet#100BASE-FX|100BASE-FX]]}}
| rowspan="3" | {{nowrap|802.3u-1995}}<br /><small>(CL24/26)</small>
| rowspan="3" {{active|current}}
| rowspan="3" {{CGuest|fiber<br /><small>'''{{fontcolour|#F88379|1300&nbsp;nm}}'''</small>}}
| rowspan="3" {{CGuest|ST<br /> SC<br /> {{no wrap|MT-RJ}}<br /> MIC (FDDI)}}
| rowspan="3" {{N/A}}
| style="background-color:orange" | {{nowrap|FDDI: 2k (FDX)}}
| rowspan="3" align="right" | 2
| rowspan="3" align="right" | 1
| rowspan="3" align="right" | 1
| rowspan="3" | <small>max. 412&nbsp;m for half-duplex connections to ensure collision detection;<br />specification largely derived from FDDI.<br />[[Modal bandwidth]]: 800&nbsp;MHz·km</small> <ref>{{cite web |url=https://www.ccontrols.com/pdf/ExtV2N6.pdf |title=Introduction To Fast Ethernet |publisher=Contemporary Control Systems, Inc. |date=2001-11-01 |access-date=2018-08-25}}</ref><ref name="MOXA-EDS408A-datasheet">{{cite web |url=https://www.moxa.com/en/products/industrial-network-infrastructure/ethernet-switches/layer-2-managed-switches/eds-408a-series/eds-408a-mm-st |title=Datasheet for EDS-408A-MM-ST |publisher=MOXA  |date=2019-08-06}}</ref>
|-
| style="background-color:orange" | {{nowrap|OM1: 4k}}
|-
| style="background-color:orange" | {{nowrap|50/125: 5k}}
|-
| rowspan="5" | {{nowrap|[[Fast Ethernet#100BASE-LFX|100BASE-LFX]]}}
| rowspan="5" {{partial|''proprietary<br /><small>(non IEEE)</small>''}}
| rowspan="5" {{active|current}}
| rowspan="5" {{CGuest|fiber<br /><small>'''{{fontcolour|#F88379|1310&nbsp;nm}}'''</small>}}
| rowspan="5" {{CGuest|LC (SFP)<br />ST<br />SC}}
| rowspan="5" align="center" | SFP
| style="background-color:orange" | {{nowrap|OM1: 2k}} 
| rowspan="5" align="right" | 2
| rowspan="5" align="right" | 1
| rowspan="5" align="right" | 1
| rowspan="5" | <small>vendor-specific<br /> FP laser transmitter<br />Full-duplex<br />[[Modal bandwidth]]: 800&nbsp;MHz·km</small> <ref name="MOXA-1fe-datasheet">{{cite web |url=https://www.moxa.com/getmedia/97d0d84d-3574-4456-a8b1-ee24aeaf04fc/moxa-sfp-1fe-series-datasheet-v1.0.pdf |title=Datasheet for SFP-1FE Series |publisher=MOXA  |date=2018-10-12 |access-date=2020-03-21}}</ref>
|-
| style="background-color:orange" | {{nowrap|OM2: 2k}}
|-
| style="background-color:orange" | {{nowrap|62.5/125: 4k}}
|-
| style="background-color:orange" | {{nowrap|50/125: 4k}}
|-
| style="background-color:yellow" | {{nowrap|OSx: 40k<ref name="MOXA-EDS408A-datasheet" />}}
|-
| rowspan="2" | {{nowrap|[[100BASE-SX]]}}
| rowspan="2" {{partial|{{nowrap|TIA-785<br />(2000)}}}}
| rowspan="2" {{partial|legacy}}
| rowspan="2" {{CGuest|fiber<br /><small>'''{{fontcolour|red|850&nbsp;nm}}'''</small>}}
| rowspan="2" {{CGuest|ST<br />SC<br />LC}}
| rowspan="2" {{N/A}}
| style="background-color:orange" | {{nowrap|OM1: 300}}
| rowspan="2" align="right" | 2
| rowspan="2" align="right" | 1
| rowspan="2" align="right" | 1
| rowspan="2" | <small>optics sharable with 10BASE-FL, thus making it possible to have an auto-negotiation scheme and use 10/100 fiber adapters.</small>
|-
| style="background-color:orange" | {{nowrap|OM2: 300}}
|-
| {{nowrap|[[100BASE-LX10]]}}
| rowspan="2" | {{nowrap|802.3ah-2004}}<br /><small>(CL58)</small>
| {{partial|phase-out}}
| {{CGuest|fiber<br /><small>'''{{fontcolour|#F88379|1310&nbsp;nm}}'''</small>}}
| rowspan="2" {{CGuest|LC}}
| rowspan="2" align="center" | <small>'''SFP'''</small>
| style="background-color:yellow" | {{nowrap|OSx: 10k}}
| style="text-align:right;" | 2
| rowspan="2" align="right" | 1
| rowspan="2" align="right" | 1
| <small>'''full-duplex only'''</small>
|-
| {{nowrap|[[Fast Ethernet#100BASE-BX10|100BASE-BX10]]}}
| {{partial|phase-out}}
| {{CGuest|fiber<br /><small>'''{{nowrap|TX: {{fontcolour|#F88379|1310&nbsp;nm}}<br />RX: {{fontcolour|#F49AC2|1550&nbsp;nm}}}}'''</small>}}
| style="background-color:yellow" | {{nowrap|OSx: 40k}}
| style="text-align:right;" | 1
| <small>'''full-duplex only''';<br />optical multiplexer used to split TX and RX signals into different wavelengths.</small>
|-
|}

===Fast Ethernet SFP ports===
Fast Ethernet speed is not available on all SFP ports,<ref>{{cite web |title=Cisco 350 Series Data Sheet |url=https://www.cisco.com/c/en_in/products/collateral/switches/small-business-smart-switches/data-sheet-c78-737359.html |website=Cisco |access-date=22 March 2020 |language=en}}</ref> but supported by some devices.<ref>{{cite web |title=Cisco 100BASE-X SFP Data Sheet |url=https://www.cisco.com/c/en/us/products/collateral/interfaces-modules/fast-ethernet-sfp-modules/product_data_sheet0900aecd801f931c.html |website=Cisco |access-date=26 March 2020 |language=en}}</ref><ref>{{cite web |title=FS GLC-GE-100FX Transceiver |url=https://www.fs.com/products/12672.html |website=FS |access-date=26 March 2020 |language=en}}</ref> An SFP port for [[Gigabit Ethernet]] should not be assumed to be backwards compatible with Fast Ethernet.

=== Optical interoperability ===
To have interoperability there are some criteria that have to be met:<ref>{{cite web |title=Fiber incompatabilities? – Ars Technica OpenForum |url=https://arstechnica.com/civis/viewtopic.php?p=6647265&sid=1207bc662946d0bf8ff15eac6753a819#p6647265 |website=arstechnica.com |access-date=29 March 2020 | date=2006-06-06}}{{self-published inline|date=May 2020}}</ref>
* [[Line encoding]]
* [[Wavelength]]{{efn|It may possible for certain types of optics to work with a mismatch in wavelength.<ref>{{cite web |title=Everything You Always Wanted to Know About Optical Networking – But Were Afraid to Ask |url=https://archive.nanog.org/sites/default/files/Steenbergen.Everything_You_Need.pdf |website=archive.nanog.org |publisher=Richard A Steenbergen |access-date=30 March 2020}}</ref>}}
* [[Duplex (telecommunications)|Duplex mode]]
* Media count
* Media type and dimension

100BASE-X Ethernet is not backward compatible with [[10BASE-F]] and is not forward compatible with [[1000BASE-X]].

===100BASE-FX=== 
100BASE-FX is a version of Fast Ethernet over [[optical fiber]]. The 100BASE-FX [[physical medium dependent]] (PMD) sublayer is defined by [[FDDI]]'s PMD,<ref>IEEE 802.3 clause 26.2 ''Functional specifications''</ref> so 100BASE-FX is not compatible with [[10BASE-FL]], the {{nowrap|10 Mbit/s}} version over optical fiber.

100BASE-FX is still used for existing installation of [[multimode fiber]] where more speed is not required, like industrial automation plants.<ref name="MOXA-EDS408A-datasheet" />

===100BASE-LFX=== 
100BASE-LFX is a non-standard term to refer to Fast Ethernet transmission. It is very similar to 100BASE-FX but achieves longer distances up to 4–5&nbsp;km over a pair of multi-mode fibers through the use of [[Fabry–Pérot]] laser transmitter<ref>{{cite web |url=https://www.fs.com/products/37324.html |title=Datasheet for SFP-100FX-31|publisher=FS.com |access-date=2020-03-21}}</ref> running on 1310&nbsp;nm wavelength. The signal attenuation per km at 1300&nbsp;nm is about half the loss of 850&nbsp;nm.<ref name="Fluke-Fiber">{{cite web |title= Knowledge Base Fiber |url=https://www.flukenetworks.com/knowledge-base/copper-testing/om1-om2-om3-om4-om5-and-os1-os2-fiber |website=Fluke Networks |access-date=8 April 2020 |language=en-us |date=28 February 2014}}</ref><ref>{{cite web |title=Differences between OM1, OM2, OM3, OM4, OS1, OS2 fiber optic cable nomenclatures |url=https://www.stl.tech/connectivity-solution/optical-fibre/pdf/Differences_between_OM1__OM2__OM3__OM4_.pdf |website=stl.tech |access-date=8 April 2020 |archive-date=18 May 2020 |archive-url=https://web.archive.org/web/20200518045943/https://www.stl.tech/connectivity-solution/optical-fibre/pdf/Differences_between_OM1__OM2__OM3__OM4_.pdf |url-status=dead }}</ref>

===100BASE-SX===
100BASE-SX is a version of Fast Ethernet over optical fiber standardized in TIA/EIA-785-1-2002. It is a lower-cost, shorter-distance alternative to 100BASE-FX. Because of the shorter wavelength used (850&nbsp;nm) and the shorter distance supported, 100BASE-SX uses less expensive optical components (LEDs instead of lasers).

Because it uses the same wavelength as [[10BASE-FL]], the {{nowrap|10 Mbit/s}} version of Ethernet over optical fiber, 100BASE-SX can be backward-compatible with 10BASE-FL. Cost and compatibility makes 100BASE-SX an attractive option for those upgrading from 10BASE-FL and those who do not require long distances.

===100BASE-LX10===
100BASE-LX10 is a version of Fast Ethernet over optical fiber standardized in 802.3ah-2004 clause 58. It has a 10&nbsp;km reach over a pair of single-mode fibers.

===100BASE-BX10===
100BASE-BX10 is a version of Fast Ethernet over optical fiber standardized in 802.3ah-2004 clause 58. It uses an optical multiplexer to split TX and RX signals into different wavelengths on the same fiber. It has a 10&nbsp;km reach over a single strand of single-mode fiber.

===100BASE-EX===
100BASE-EX is very similar to 100BASE-LX10 but achieves longer distances up to 40&nbsp;km over a pair of single-mode fibers due to higher quality optics than a LX10, running on 1310&nbsp;nm wavelength lasers. 100BASE-EX is not a formal standard but industry-accepted term.<ref name="FS-GLC-FE-100EX">{{cite web |title=GLC-FE-100EX 100BASE-EX SFP (mini-GBIC) Transceiver |url=https://www.fs.com/de-en/products/12678.html |website=FS.com |access-date=21 March 2020 |language=en}}</ref> It is sometimes referred to as 100BASE-LH (long haul), and is easily confused with 100BASE-LX10 or 100BASE-ZX because the use of -LX(10), -LH, -EX, and -ZX is ambiguous between vendors.

===100BASE-ZX===
100BASE-ZX is a non-standard but multi-vendor<ref name="FS-SFP-100ZX-55">{{cite web |title=FS-GLC-FE-100ZX 100BASE-ZX |url=https://www.fs.com/products/12679.html |website=FS.com |access-date=21 March 2020 |language=en}}</ref>{{Better source needed|date=February 2021}} term to refer to Fast Ethernet transmission using 1,550&nbsp;nm wavelength to achieve distances of at least 70&nbsp;km over single-mode fiber. Some vendors specify distances up to 160&nbsp;km over single-mode fiber, sometimes called 100BASE-EZX. Ranges beyond 80&nbsp;km are highly dependent upon the path loss of the fiber in use, specifically the attenuation figure in dB per km, the number and quality of connectors/patch panels and splices located between transceivers.<ref>{{cite web |title=SFP15160FE0B / SFP / 100BASE-eZX |url=https://www.skylaneoptics.com/en/product/sfp15160fe0b-sfp-100base-ezx/ |website=Skylane Optics |access-date=21 March 2020|archive-url=https://web.archive.org/web/20200819045024/https://www.skylaneoptics.com/en/product/sfp15160fe0b-sfp-100base-ezx/|archive-date=August 19, 2020|url-status=dead}}</ref>