[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/en\/wiki10\/25-gigabit-ethernet-wikipedia\/#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/en\/wiki10\/25-gigabit-ethernet-wikipedia\/","headline":"25 Gigabit Ethernet – Wikipedia","name":"25 Gigabit Ethernet – Wikipedia","description":"before-content-x4 From Wikipedia, the free encyclopedia after-content-x4 Standards for Ethernet networking at a data rate of 25 and 50 gigabits","datePublished":"2015-06-24","dateModified":"2015-06-24","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/en\/wiki10\/author\/lordneo\/#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/en\/wiki10\/author\/lordneo\/","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","url":"https:\/\/en.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","height":"1","width":"1"},"url":"https:\/\/wiki.edu.vn\/en\/wiki10\/25-gigabit-ethernet-wikipedia\/","wordCount":3872,"articleBody":"     (adsbygoogle = window.adsbygoogle || []).push({});before-content-x4From Wikipedia, the free encyclopedia       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Standards for Ethernet networking at a data rate of 25 and 50 gigabits per second25 Gigabit Ethernet and 50 Gigabit Ethernet are standards for Ethernet connectivity in a datacenter environment, developed by IEEE 802.3 task forces 802.3by[1] and 802.3cd[2] and are available from multiple vendors.       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4Table of ContentsHistory[edit]25 Gigabit Ethernet[edit]50 Gigabit Ethernet[edit]Availability[edit]See also[edit]References[edit]External links[edit]History[edit]An industry consortium, 25G Ethernet Consortium,[3] was formed by Arista, Broadcom, Google, Mellanox Technologies and Microsoft in July 2014 to support the specification of single-lane 25-Gbit\/s Ethernet and dual-lane 50-Gbit\/s Ethernet technology. The 25G Ethernet Consortium specification draft was completed in September 2015 and uses technology from IEEE Std. 802.3ba and IEEE Std. 802.3bj.In November 2014, an IEEE 802.3 task force was formed to develop a single-lane 25-Gbit\/s standard,[4][5] and in November 2015, a study group was formed to explore the development of a single-lane 50-Gbit\/s standard.[6]       (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4In May 2016, an IEEE 802.3 task force was formed to develop a single-lane 50\u00a0Gigabit Ethernet standard.[2]On June 30, 2016, the IEEE 802.3by standard was approved by The IEEE-SA Standards Board.[7]On November 12, 2018, the IEEE P802.3cn Task Force started working to define PHY supporting 50-Gbit\/s operation over at least 40 km of SMF.[8]The IEEE 802.3cd standard was approved on December 5, 2018.On December 20, 2019, the IEEE 802.3cn standard was published. [9]On April 6, 2020, 25 Gigabit Ethernet Consortium has rebranded to Ethernet Technology Consortium, and it announces 800 Gigabit Ethernet (GbE) specification.[10]On June 4, 2020, the IEEE approved IEEE 802.3ca which allows for symmetric or asymmetric operation with downstream speeds of 25 or 50\u00a0Gbit\/s, and upstream speeds of 10, 25, or 50\u00a0Gbit\/s over passive optical networks.[11][12]25 Gigabit Ethernet[edit]The IEEE 802.3by standard uses technology defined for 100 Gigabit Ethernet implemented as four 25-Gbit\/s lanes (IEEE 802.3bj).[13][14] The IEEE 802.3by standard several single-lane variations.[15]Legend for fibre-based PHYs[16]MMF FDDI62.5\/125\u00a0\u00b5m(1987)MMF OM162.5\/125\u00a0\u00b5m(1989)MMF OM250\/125\u00a0\u00b5m(1998)MMF OM350\/125\u00a0\u00b5m(2003)MMF OM450\/125\u00a0\u00b5m(2008)MMF OM550\/125\u00a0\u00b5m(2016)SMF OS19\/125\u00a0\u00b5m(1998)SMF OS29\/125\u00a0\u00b5m(2000)160\u00a0MHz\u00b7km@ 850\u00a0nm200\u00a0MHz\u00b7km@ 850\u00a0nm500\u00a0MHz\u00b7km@ 850\u00a0nm1500\u00a0MHz\u00b7km@ 850\u00a0nm3500\u00a0MHz\u00b7km@ 850\u00a0nm3500\u00a0MHz\u00b7km@ 850\u00a0nm &1850\u00a0MHz\u00b7km@ 950\u00a0nm1\u00a0dB\/km@ 1300\/1550\u00a0nm0.4\u00a0dB\/km@ 1300\/1550\u00a0nmNameStandardStatusMediaConnectorTransceiverModuleReachin m#(\u21c6)#(\u2192)#(\u2192)Notes25 Gigabit Ethernet (25\u00a0GbE) – (Data rate: 25\u00a0Gbit\/s – Line code: 64b\/66b with and without RS-FEC(528,514) \u00d7 NRZ – Line rate: 25.78125\u00a0GBd – Full-Duplex) [17]25GAUI802.3by-2016(CL109A\/B)currentChip-to-chip\/Chip-to-module interface\u2014\u20140.252N\/A1PCBs25GBASE-KR802.3by-2016(CL111)currentCu-Backplane\u2014\u201411N\/A1PCBs25GBASE-KR-S802.3by-2016(CL111)currentCu-Backplane\u2014\u201411N\/A1PCBs;without RS-FEC (802.3by CL108)25GBASE-CRDirect Attach802.3by-2016(CL110)currenttwinaxialbalancedSFP28(SFF-8402)SFP2852N\/A1Data centres (inter-rack)25GBASE-CR-SDirect Attach802.3by-2016(CL110)currenttwinaxialbalancedSFP28(SFF-8402)SFP2831N\/A1Data centres (in-rack);without RS-FEC (802.3by CL108)25GBASE-SR802.3by-2016(CL112)currentFibre850\u00a0nmLCSFP28OM3: 70211OM4: 10025GBASE-LR802.3cc-2017(CL114)currentFibre1295 \u2013 1325\u00a0nmLCSFP28OS2: 10k21125GBASE-ER802.3cc-2017(CL114)currentFibre1550\u00a0nmLCSFP28OS2: 40k21125GBASE-T25GBASE-T, a 25-Gbit\/s standard over twisted pair, was approved alongside 40GBASE-T within IEEE 802.3bq.[18][19]Comparison of twisted-pair-based Ethernet physical transport layers (TP-PHYs)[16]NameStandardStatusSpeed (Mbit\/s)Pairs requiredLanes per directionBits per hertzLine codeSymbol rate per lane (MBd)BandwidthMax distance (m)CableCable rating (MHz)Usage25GBASE-T802.3bq-2016 (CL113)current25000446.25PAM-16 RS-FEC (192, 186) LDPC2000100030Cat\u00a082000LAN, Data centres50 Gigabit Ethernet[edit]The IEEE P802.3cd [2] standard defines a Physical Coding Sublayer (PCS) in Clause 133 which after encoding gives a data rate of 51.5625\u00a0Gbit\/s. 802.3cd also defines an RS-FEC for forward error correction in Clause 134 which after FEC encoding gives a data rate of 53.125\u00a0Gbit\/s. It is not possible to transmit 53.125\u00a0Gbit\/s over an electrical interface while maintaining suitable signal integrity so four-level pulse-amplitude modulation (PAM4) is used to map pairs of bits into a single symbol. This leads to an overall baud rate of 26.5625 GBd for 50\u00a0Gbit\/s per lane Ethernet. PAM4 encoding for 50G Ethernet is defined in Clause 135 of the 802.3 standard.Legend for fibre-based PHYs[16]MMF FDDI62.5\/125\u00a0\u00b5m(1987)MMF OM162.5\/125\u00a0\u00b5m(1989)MMF OM250\/125\u00a0\u00b5m(1998)MMF OM350\/125\u00a0\u00b5m(2003)MMF OM450\/125\u00a0\u00b5m(2008)MMF OM550\/125\u00a0\u00b5m(2016)SMF OS19\/125\u00a0\u00b5m(1998)SMF OS29\/125\u00a0\u00b5m(2000)160\u00a0MHz\u00b7km@ 850\u00a0nm200\u00a0MHz\u00b7km@ 850\u00a0nm500\u00a0MHz\u00b7km@ 850\u00a0nm1500\u00a0MHz\u00b7km@ 850\u00a0nm3500\u00a0MHz\u00b7km@ 850\u00a0nm3500\u00a0MHz\u00b7km@ 850\u00a0nm &1850\u00a0MHz\u00b7km@ 950\u00a0nm1\u00a0dB\/km@ 1300\/1550\u00a0nm0.4\u00a0dB\/km@ 1300\/1550\u00a0nmNameStandardStatusMediaConnectorTransceiverModuleReachin m#(\u21c6)#(\u2192)#(\u2192)Notes50 Gigabit Ethernet (50\u00a0GbE) – (Data rate: 50\u00a0Gbit\/s – Line code: 256b\/257b \u00d7 RS-FEC(544,514) \u00d7 PAM4 – Line rate: 26.5625\u00a0GBd – Full-Duplex) [20][21]LAUI-2802.3cd-2018(CL135B\/C)currentChip-to-chip\/Chip-to-module interface\u2014\u20140.252N\/A2PCBs;Line code: NRZ (no FEC)Line rate: 2x 25.78125\u00a0GBd = 51.5625\u00a0GBd50GAUI-2802.3cd-2018(CL135D\/E)currentChip-to-chip\/Chip-to-module interface\u2014\u20140.252N\/A2PCBs;Line code: NRZ (FEC encoded)Line rate: 2x 26.5625\u00a0GBd = 53.1250\u00a0GBd50GAUI-1802.3cd-2018(CL135F\/G)currentChip-to-chip\/Chip-to-module interface\u2014\u20140.251N\/A1PCBs50GBASE-KR802.3cd-2018(CL133\/137)currentCu-Backplane\u2014\u201411N\/A1PCBs;total channel insertion loss \u2264 30\u00a0dB at half sampling rate = 13.28125\u00a0GHz (Nyquist).50GBASE-CR802.3cd-2018(CL133\/136)currenttwinaxialbalancedQSFP28,microQSFP,QSFP-DD,OSFP(SFF-8635)QSFP2831N\/A1Data centres (in-rack)50GBASE-SR802.3cd-2018(CL133\/138)currentFibre850\u00a0nmLCQSFP+OM3: 70211OM4: 10050GBASE-LR802.3cd-2018(CL133\/139)currentFibre1304.5 \u2013 1317.5\u00a0nmLCQSFP+OS2: 10k21150GBASE-FR802.3cd-2018(CL133\/139)currentFibre1304.5 \u2013 1317.5\u00a0nmLCQSFP+OS2: 2k21150GBASE-ER802.3cn-2019(CL133\/139)currentFibre1304.5 \u2013 1317.5\u00a0nmLCQSFP+OS2: 40k211Availability[edit]As of June 2016[update], 25 Gigabit Ethernet equipment is available on the market using the SFP28 and QSFP28 transceiver form factors. Direct attach SFP28-to-SFP28 copper cables in 1-, 2-, 3- and 5-meter lengths are available from several manufacturers, and optical transceiver manufacturers have announced 1310\u00a0nm “LR” optics intended for reach distances of 2 to 10\u00a0km over two strands of standard singlemode fiber, similar to existing 10GBASE-LR optics, as well as 850\u00a0nm “SR” optics intended for short reach distances of 100\u00a0m over two strands of OM4 multimode fiber, similar to existing 10GBASE-SR optics.[citation needed]See also[edit]References[edit]External links[edit]     (adsbygoogle = window.adsbygoogle || []).push({});after-content-x4"},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki10\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/en\/wiki10\/25-gigabit-ethernet-wikipedia\/#breadcrumbitem","name":"25 Gigabit Ethernet – Wikipedia"}}]}]