IEEE 802.3

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IEEE 802.3 is a working group and a collection 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 LAN access method using CSMA/CD.

Communication standards

Ethernet standardDateDescription
1973 [1] 2.94  Mbit/s (367  kB/s) over coaxial cable (coax) bus. Single byte node address unique only to individual network.
Ethernet I
(DIX v1.0)
198010 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 byte MAC address.
Ethernet II
(DIX v2.0)
IEEE 802.3 standard1983 10BASE5 10 Mbit/s (1.25 MB/s) over thick coax. 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 Process.
802.3a 1985 10BASE2 10 Mbit/s (1.25 MB/s) over thin Coax (a.k.a. thinnet or cheapernet)
802.3b 1985 10BROAD36
802.3c198510 Mbit/s (1.25 MB/s) repeater specs
802.3-19851985a revision of the base standard from 1983
802.3d 1987 Fiber-optic inter-repeater link
802.3e 1987 1BASE5 or StarLAN, first use of (voice-grade) twisted pair cabling, 1 Mbit/s, maximum reach of 250 to 500 m
802.3i 1990 10BASE-T 10 Mbit/s (1.25 MB/s) over twisted pair
802.3j 1993 10BASE-F 10 Mbit/s (1.25 MB/s) over optical fiber
802.3q1993 GDMO (ISO/IEC 10165-4) format for Layer Managed Objects
802.3u 1995 100BASE-TX, 100BASE-T4, 100BASE-FX Fast Ethernet at 100 Mbit/s (12.5 MB/s) with autonegotiation
802.3x 1997Full Duplex and flow control; also incorporates DIX framing, so there's no longer a DIX/802.3 split
802.3y 1998 100BASE-T2 100 Mbit/s (12.5 MB/s) over voice-grade twisted pair
802.3z 1998-07 1000BASE-X Gbit/s Ethernet over optical fiber at 1 Gbit/s (125 MB/s)
802.3-19981998-07(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 1998-09Max 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
802.3-20022002-01(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
802.3-20052005-06(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)
802.3ap2007-03 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
P802.3arCancelledCongestion management (withdrawn)
802.3as2006-09Frame expansion
802.3at 2009-09 Power over Ethernet enhancements (25.5 W)
802.3au 2006-06Isolation requirements for Power over Ethernet (802.3-2005/Cor 1)
802.3av 2009-0910 Gbit/s EPON
802.3aw2007-06Fixed an equation in the publication of 10GBASE-T (released as 802.3-2005/Cor 2)
802.3ax2008-11Link aggregation – moved to and approved as 802.1AX
802.3-20082008-12(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 2010-0640 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 12009(802.3bb) Increase Pause Reaction Delay timings which are insufficient for 10 Gbit/s (workgroup name was 802.3bb)
802.3bc2009-09Move and update Ethernet related TLVs (type, length, values), previously specified in Annex F of IEEE 802.1AB (LLDP) to 802.3.
802.3bd2011-06Priority-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.
802.3.12011-05(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)
802.3bf2011-05Provide an accurate indication of the transmission and reception initiation times of certain packets as required to support IEEE P802.1AS.
802.3bg2011-03Provide 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).
802.3-20122012-08(802.3bh) A revision of base standard incorporating the 802.3at/av/az/ba/bc/bd/bf/bg amendments, a corrigenda and errata.
802.3bj2014-06Define 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.
802.3bk2013-08This 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.
802.3bm2015-02 100G/40G Ethernet for optical fiber
802.3bn2016-0910G-EPON and 10GPASS-XR, passive optical networks over coax
802.3bp2016-06 [2] 1000BASE-T1 – Gigabit Ethernet over a single twisted pair, automotive & industrial environments
802.3bq2016-06 [3] 25GBASE-T/40GBASE-T Ethernet for 4-pair balanced twisted pair cabling with 2 connectors over 30 m distances
802.3br2016-06Specification and Management Parameters for Interspersing Express Traffic
802.3bs2017-12 200GbE (200 Gbit/s) over single-mode fiber and 400GbE (400 Gbit/s) over optical physical media
802.3bt 2018-09Third 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)
802.3bv2017-02Gigabit Ethernet over plastic optical fiber (POF)
802.3bw2015-10 [4] 100BASE-T1 – 100 Mbit/s Ethernet over a single twisted pair for automotive applications
802.3-20152015-09802.3bx – 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]
802.3bz2016-09 [7] 2.5GBASE-T and 5GBASE-T – 2.5 Gigabit and 5 Gigabit Ethernet over Cat-5e/Cat-6 twisted pair
802.3ca2020-0625G-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
802.3cb2018-092.5 Gbit/s and 5 Gbit/s Operation over Backplane
802.3cc2017-1225 Gbit/s over Single Mode Fiber
802.3cd2018-12Media Access Control Parameters for 50 Gbit/s and Physical Layers and Management Parameters for 50, 100, and 200 Gbit/s Operation
802.3ce2017-03Multilane Timestamping
802.3.2-20192019-03802.3cf, 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
802.3-20182018-08802.3cj – 802.3-2015 maintenance, merge recent amendments bn/bp/bq/br/bs/bu/bv/bw/by/bz/cc/ce
802.3ck2022-09100, 200, and 400 Gbit/s Ethernet using 100 Gbit/s lanes, chaired by Beth Kochuparambil [8]
802.3cm2020-01400 Gbit/s over multimode fiber (four and eight pairs, 100 m)
802.3cn2019-1150 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
802.3cp2021-0610/25/50 Gbit/s single-strand optical access with at least 10/20/40 km reach, chaired by Frank Effenberger [8]
802.3cq 2020-01Power over Ethernet over 2 pairs (maintenance)
802.3cr2021-02Isolation (maintenance)
802.3cs2022-09"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]
802.3ct2021-06100 Gbit/s over DWDM systems (80 km reach using coherent modulation), chaired by John D'Ambrosia [8]
802.3cu2021-02100 Gbit/s and 400 Gbit/s over SMF using 100 Gbit/s lanes
802.3cv 2021-05Power over Ethernet maintenance, chaired by Chad Jones [8]
802.3cw(TBD)400 Gbit/s over DWDM Systems – scheduled for spring 2024, chaired by John D'Ambrosia [8]
802.3cx(TBD)Improved PTP timestamping accuracy – scheduled for early 2023, chaired by Steve Gorshe [8]
802.3cy(TBD) MultiGigBASE-T1 Greater than 10 Gbit/s electrical automotive Ethernet – scheduled for mid 2023, chaired by Steve Carlson [8]
802.3cz(TBD)Multi-gigabit optical automotive Ethernet – scheduled for mid 2023, 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-2024, chaired by Chad Jones [8]
802.3db2022-09100 Gbit/s, 200 Gbit/s, and 400 Gbit/s operation over optical fiber using 100 Gbit/s Signaling, chaired by Robert Lingle [8]
802.3-20222022-07802.3dc – 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 2022-06Power over Data Lines of single-pair Ethernet maintenance, chaired by George Zimmerman [8]
802.3de2022-09Time synchronization for point-to-point single-pair Ethernet, chaired by George Zimmerman
802.3df(TBD)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, chaired by George Zimmerman
802.3dh(TBD)Multi-gigabit automotive Ethernet over plastic optical fiber, scheduled for 2024, 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, chaired by John D'Ambrosia
802.3dk(TBD)Greater than 50 Gbit/s bidirectional optical access, chaired by Yuanqiu Luo

See also

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