IEEE 802.3 is a working group and a collection of standards defining the physical layer and data link layer's media access control (MAC) of wired Ethernet. The standards are produced by the working group of Institute of Electrical and Electronics Engineers (IEEE). This is generally a local area network (LAN) technology with some wide area network (WAN) applications. Physical connections are made between nodes and/or infrastructure devices (hubs, switches, routers) by various types of copper or fiber cable.

802.3 is a technology that supports the IEEE 802.1 network architecture.

802.3 also defines a LAN access method using CSMA/CD.

Communication standards

Ethernet standard IEEE approval date Description
1973[a][1] 2.94 Mbit/s (367 kB/s) over coaxial cable (coax) bus. Single-octet node address unique only to individual network.
Ethernet I
(DIX v1.0)
1980-09[b] 10 Mbit/s (1.25 MB/s) over thick coax. Frames have a Type field. This frame format is used on all forms of Ethernet by protocols in the Internet protocol suite. Six-octet MAC address.
Ethernet II
(DIX v2.0)
802.3-1985 1983-06 10BASE5 10 Mbit/s (1.25 MB/s) over thick coax. First edition of the IEEE 802.3 standard. Approved by IEEE in 1983, approved by ANSI in 1984, and published in 1985. Same as Ethernet II (above) except Type field is replaced by Length, and an 802.2 LLC header follows the 802.3 header. Based on the CSMA/CD media access method.
802.3a 1985-11 10BASE2 10 Mbit/s (1.25 MB/s) over thin Coax (a.k.a. thinnet or cheapernet)
802.3b 1985-09 10BROAD36
802.3c 1985-12 10 Mbit/s (1.25 MB/s) repeater specs
802.3d 1987-12 Fiber-optic inter-repeater link
802.3e 1987-06 1BASE5 or StarLAN, first use of (voice-grade) twisted pair cabling, 1 Mbit/s, maximum reach of 250 to 500 m
802.3h 1990-09 10 Mbit/s layer management, DTEs
802.3i 1990-09 10BASE-T 10 Mbit/s (1.25 MB/s) over twisted pair
802.3j 1992-09 10BASE-F 10 Mbit/s (1.25 MB/s) over optical fiber
802.3k 1992-09 10 Mbit/s layer management, repeaters
802.3m 1995-09 Maintenance
802.3n 1995-09 Maintenance
802.3q 1993-06 GDMO (ISO/IEC 10165-4) format for Layer Managed Objects
802.3r 1996-07 10BASE5 Medium Attachment Unit PICS
802.3s 1995-09 Maintenance
802.3t 1995-06 120 Ω informative annex for 10BASE-T
802.3u 1995-06 100BASE-TX, 100BASE-T4, 100BASE-FX Fast Ethernet at 100 Mbit/s (12.5 MB/s) with autonegotiation
802.3v 1995-12 150 Ω informative annex for 10BASE-T
802.3x 1997-03 Full Duplex and flow control; also incorporates DIX framing, so there's no longer a DIX/802.3 split
802.3y 1997-03 100BASE-T2 100 Mbit/s (12.5 MB/s) over voice-grade twisted pair
802.3z 1998-06 1000BASE-X Gbit/s Ethernet over optical fiber at 1 Gbit/s (125 MB/s)
802.3-1998 1998-06 (802.3aa) A revision of base standard incorporating the above amendments and errata
802.3ab 1999-06 1000BASE-T Gbit/s Ethernet over twisted pair at 1 Gbit/s (125 MB/s)
802.3ac 1998-09 Max frame size extended to 1522 bytes (to allow "Q-tag") The Q-tag includes 802.1Q VLAN information and 802.1p priority information.
802.3ad 2000-03 Link aggregation for parallel links, since moved to IEEE 802.1AX
802.3-2002 2002-01 (802.3ag) A revision of base standard incorporating the three prior amendments and errata
802.3ae 2002-06 10 Gigabit Ethernet over fiber; 10GBASE-SR, 10GBASE-LR, 10GBASE-ER, 10GBASE-SW, 10GBASE-LW, 10GBASE-EW
802.3af 2003-06 Power over Ethernet (15.4 W)
802.3ah 2004-06 Ethernet in the First Mile
802.3ak 2004-02 10GBASE-CX4 10 Gbit/s (1,250 MB/s) Ethernet over twinaxial cables
802.3-2005 2005-06 (802.3am) A revision of base standard incorporating the four prior amendments and errata.
802.3an 2006-06 10GBASE-T 10 Gbit/s (1,250 MB/s) Ethernet over unshielded twisted pair (UTP)
802.3ap 2007-03 Backplane Ethernet (1 and 10 Gbit/s (125 and 1,250 MB/s) over printed circuit boards)
802.3aq 2006-09 10GBASE-LRM 10 Gbit/s (1,250 MB/s) Ethernet over multimode fiber
P802.3ar Cancelled Congestion management (withdrawn)
802.3as 2006-09 Frame expansion
802.3at 2009-09 Power over Ethernet enhancements (25.5 W)
802.3au 2006-06 Isolation requirements for Power over Ethernet (802.3-2005/Cor 1)
802.3av 2009-09 10 Gbit/s EPON
802.3aw 2007-06 Fixed an equation in the publication of 10GBASE-T (released as 802.3-2005/Cor 2)
802.3ax 2008-11 Link aggregation – moved to and approved as 802.1AX
802.3-2008 2008-12 (802.3ay) A revision of base standard incorporating the 802.3an/ap/aq/as amendments, two corrigenda and errata.
802.3az 2010-09 Energy-Efficient Ethernet
802.3ba 2010-06 40 Gbit/s and 100 Gbit/s Ethernet. 40 Gbit/s over 1 m backplane, 10 m Cu cable assembly (4×25 Gbit or 10×10 Gbit lanes) and 100 m of MMF and 100 Gbit/s up to 10 m of Cu cable assembly, 100 m of MMF or 40 km of SMF respectively
802.3-2008/Cor 1 2009-12 (802.3bb) Increase Pause Reaction Delay timings which are insufficient for 10 Gbit/s (workgroup name was 802.3bb)
802.3bc 2009-09 Move and update Ethernet related TLVs (type, length, values), previously specified in Annex F of IEEE 802.1AB (LLDP) to 802.3.
802.3bd 2011-06 Priority-based Flow Control. An amendment by the IEEE 802.1 Data Center Bridging Task Group (802.1Qbb) to develop an amendment to IEEE Std 802.3 to add a MAC Control Frame to support IEEE 802.1Qbb Priority-based Flow Control.
802.3.1 2011-05 (802.3be) MIB definitions for Ethernet. It consolidates the Ethernet related MIBs present in Annex 30A&B, various IETF RFCs, and 802.1AB annex F into one master document with a machine readable extract. (workgroup name was P802.3be)
802.3bf 2011-05 Provide an accurate indication of the transmission and reception initiation times of certain packets as required to support IEEE P802.1AS.
802.3bg 2011-03 Provide a 40 Gbit/s PMD which is optically compatible with existing carrier SMF 40 Gbit/s client interfaces (OTU3/STM-256/OC-768/40G POS).
802.3-2012 2012-08 (802.3bh) A revision of base standard incorporating the 802.3at/av/az/ba/bc/bd/bf/bg amendments, a corrigenda and errata.
802.3bj 2014-06 Define a 4-lane 100 Gbit/s backplane PHY for operation over links consistent with copper traces on "improved FR-4" (as defined by IEEE P802.3ap or better materials to be defined by the Task Force) with lengths up to at least 1 m and a 4-lane 100 Gbit/s PHY for operation over links consistent with copper twinaxial cables with lengths up to at least 5 m.
802.3bk 2013-08 This amendment to IEEE Std 802.3 defines the physical layer specifications and management parameters for EPON operation on point-to-multipoint passive optical networks supporting extended power budget classes of PX30, PX40, PRX40, and PR40 PMDs.
802.3bm 2015-02 100G/40G Ethernet for optical fiber
802.3bn 2016-09 10G-EPON and 10GPASS-XR, passive optical networks over coax
802.3bp 2016-06[2] 1000BASE-T1 – Gigabit Ethernet over a single twisted pair, automotive & industrial environments
802.3bq 2016-06[3] 25GBASE-T/40GBASE-T Ethernet for 4-pair balanced twisted pair cabling with 2 connectors over 30 m distances
802.3br 2016-06 Specification and Management Parameters for Interspersing Express Traffic
802.3bs 2017-12 200GbE (200 Gbit/s) over single-mode fiber and 400GbE (400 Gbit/s) over optical physical media
802.3bt 2018-09 Third generation Power over Ethernet with up to 100 W using all 4 pairs balanced twisted pair cabling (4PPoE), including 10GBASE-T, lower standby power and specific enhancements to support IoT applications (e.g. lighting, sensors, building automation).
802.3bu 2016-12 Power over Data Lines (PoDL) for single twisted pair Ethernet (100BASE-T1)
802.3bv 2017-02 Gigabit Ethernet over plastic optical fiber (POF)
802.3bw 2015-10[4] 100BASE-T1 – 100 Mbit/s Ethernet over a single twisted pair for automotive applications
802.3-2015 2015-09 802.3bx – a new consolidated revision of the 802.3 standard including amendments 802.3bk/bj/bm
802.3by 2016-06[5] Optical fiber, twinax and backplane 25 Gigabit Ethernet[6]
802.3bz 2016-09[7] 2.5GBASE-T and 5GBASE-T – 2.5 Gigabit and 5 Gigabit Ethernet over Cat-5e/Cat-6 twisted pair
802.3ca 2020-06 25G-EPON and 50G-EPON – Downstream/Upstream rates of 25/10, 25/25, 50/10, 50/25, 50/50 Gbit/s over Ethernet Passive Optical Networks
802.3cb 2018-09 2.5 Gbit/s and 5 Gbit/s Operation over Backplane
802.3cc 2017-12 25 Gbit/s over Single Mode Fiber
802.3cd 2018-12 Media Access Control Parameters for 50 Gbit/s and Physical Layers and Management Parameters for 50, 100, and 200 Gbit/s Operation
802.3ce 2017-03 Multilane Timestamping
802.3.2-2019 2019-03 802.3cf, YANG Data Model Definitions
802.3cg 2019-11 10BASE-T1L and 10BASE-T1S – 10 Mbit/s Single twisted pair Ethernet
802.3ch 2020-06 MultiGigBASE-T1 Automotive Ethernet (2.5, 5, 10 Gbit/s) over 15 m with optional PoDL
802.3-2018 2018-08 802.3cj – 802.3-2015 maintenance, merge recent amendments bn/bp/bq/br/bs/bu/bv/bw/by/bz/cc/ce
802.3ck 2022-09 100, 200, and 400 Gbit/s Ethernet using 100 Gbit/s lanes, chaired by Beth Kochuparambil[8]
802.3cm 2020-01 400 Gbit/s over multimode fiber (four and eight pairs, 100 m)
802.3cn 2019-11 50 Gbit/s (40 km), 100 Gbit/s (80 km), 200 Gbit/s (four λ, 40 km), and 400 Gbit/s (eight λ, 40 km and single λ, 80 km over DWDM) over Single-Mode Fiber and DWDM
802.3cp 2021-06 10/25/50 Gbit/s single-strand optical access with at least 10/20/40 km reach, chaired by Frank Effenberger[8]
802.3cq 2020-01 Power over Ethernet over 2 pairs (maintenance)
802.3cr 2021-02 Isolation (maintenance)
802.3cs 2022-09 "Super-PON" – increased-reach, 10 Gbit/s optical access with at least 50 km reach and 1:64 split ratio per wavelength pair, 16 wavelength pairs, chaired by Claudio DeSanti[8]
802.3ct 2021-06 100 Gbit/s over DWDM systems (80 km reach using coherent modulation), chaired by John D'Ambrosia[8]
802.3cu 2021-02 100 Gbit/s and 400 Gbit/s over SMF using 100 Gbit/s lanes
802.3cv 2021-05 Power over Ethernet maintenance, chaired by Chad Jones[8]
802.3cw (TBD) 400 Gbit/s over DWDM Systems – scheduled for fall 2024, chaired by John D'Ambrosia[8]
802.3cx 2023-03 Improved PTP timestamping accuracy, chaired by Steve Gorshe[8]
802.3cy 2023-06 MultiGigBASE-T1 25 Gbit/s electrical automotive Ethernet,[9] chaired by Steve Carlson[8]
802.3cz 2023-03 Multi-gigabit optical automotive Ethernet, chaired by Bob Grow[8]
802.3da (TBD) 10BASE-T1S 10 Mb/s operation over single balanced pair multidrop segments, extended length up to 50 m – scheduled for mid 2025, chaired by Chad Jones[8]
802.3db 2022-09 100 Gbit/s, 200 Gbit/s, and 400 Gbit/s operation over optical fiber using 100 Gbit/s Signaling, chaired by Robert Lingle[8]
802.3-2022 2022-07 802.3dc – 802.3-2018 maintenance, merge recent amendments bt/ca/cb/cd/cg/ch/cm/cn/cp/cq/cr/ct/cu/cv, chaired by Adam Healey[8]
802.3dd 2022-06 Power over Data Lines of single-pair Ethernet maintenance, chaired by George Zimmerman[8]
802.3de 2022-09 Time synchronization for point-to-point single-pair Ethernet, chaired by George Zimmerman
802.3df 2024-02 200 Gb/s, 400 Gb/s and 800 Gb/s using 100 Gbit/s lanes, chaired by John D’Ambrosia
802.3dg (TBD) 100BASE-T1 and 1000BASE-T1 extended length to 500 m – scheduled for mid 2025, chaired by George Zimmerman
802.3dh canceled Multi-gigabit automotive Ethernet over plastic optical fiber, chaired by Yuji Watanabe
802.3dj (TBD) 200 Gb/s, 400 Gb/s, 800 Gb/s and 1.6 Tbit/s using 200 Gbit/s lanes – scheduled for spring 2026, chaired by John D'Ambrosia
802.3dk (TBD) Greater than 50 Gbit/s bidirectional optical access, chaired by Yuanqiu Luo
802.3dm (TBD) Asymmetrical Electrical Automotive Ethernet, chaired by Jon Lewis
802.3dn (TBD) 802.3-2022/Cor 1 Multi-Gigabit Automotive MDI Return Loss, chaired by Brett McClellan
  1. ^ developed at Xerox PARC
  2. ^ a b published by DEC, Intel, Xerox PARC

See also


  1. ^ "Ethernet Prototype Circuit Board". Smithsonian National Museum of American History. Retrieved 2014-10-31.
  2. ^ "IEEE P802.3bp 1000BASE-T1 PHY Task Force". 2016-07-29. Retrieved 2016-10-02.
  3. ^ "Approval of IEEE Std 802.3by-2016, IEEE Std 802.3bq-2016, IEEE Std 802.3bp-2016 and IEEE Std 802.3br-2016". IEEE. 2016-06-30..
  4. ^ "IEEE P802.3bw 100BASE-T1 Task Force". 2015-10-27. The work of the IEEE P802.3bw 100BASE-T1 Task Force completed with the approval of IEEE Std 802.3bw-2015 by the IEEE-SA Standards Board on 27 October 2015.
  5. ^ "[STDS-802-3-25G] IEEE Std 802.3by-2016 Standard Approved!". 2016-06-30.
  6. ^ P802.3by 25 Gbit/s Ethernet Task Force, IEEE.
  7. ^ "[802.3_NGBASET] FW: Approval of IEEE Std 802.3bz 2.5GBASE-T and 5GBASE-T". IEEE P802.3bz Task Force. Retrieved 2016-09-24.
  8. ^ a b c d e f g h i j k l m "IEEE 802.3 Ethernet Task Force, Study Group, and Ad Hoc Officers". IEEE. 30 April 2021. Retrieved 2021-05-26.
  9. ^ "Physical Layer Specifications and Management Parameters for 25 Gb/s - Electrical Automotive Ethernet". IEEE. 2023-08-11.