Telecommunications and exchange between information technology systems — Requirements for local and metropolitan area networks — Part 3: Standard for Ethernet — Amendment 2: Physical layer and management parameters for power over Ethernet over 4 pairs

Télécommunications et échange entre systèmes informatiques — Exigences pour les réseaux locaux et métropolitains — Partie 3: Norme pour Ethernet — Amendement 2: Couche physique et paramètres de gestion pour la puissance par ethernet sur 4 paires

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Standards Content (Sample)

Telecommunications and exchange
Secretariat: KATS
between information technology
Voting begins on:
2021-06-24 systems — Requirements for local and
metropolitan area networks —
Voting terminates on:
Part 3:
Standard for Ethernet
AMENDMENT 2: Physical layer and
management parameters for power over
Ethernet over 4 pairs
Télécommunications et échange entre systèmes informatiques —
Exigences pour les réseaux locaux et métropolitains —
Partie 3: Norme pour Ethernet
Reference number
ISO/IEC/IEEE 8802-3:2021/FDAM 2:2021(E)

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ISO/IEC/IEEE 8802-3:2021/FDAM 2:2021(E)

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ISO/IEC/IEEE 8802-3:2021/FDAM 2:2021(E)
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IEEE Std 802.3bt™-2018
(Amendment to IEEE Std 802.3™-2018
as amended by IEEE Std 802.3cb™-2018)
IEEE Standard for Ethernet
Amendment 2:
Physical Layer and 
Management Parameters for 
Power over Ethernet over 4 Pairs
LAN/MAN Standards Committee
of the
IEEE Computer Society
Approved 27 September 2018
IEEE-SA Standards Board

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ISO/IEC/IEEE 8802-3:2021/Amd.2:2021(E)
Abstract: The maximum Powered Device (PD) power available is increased by this amendment to
IEEE Std 802.3-2018 by utilizing all four pairs in the specified structured wiring plant. This
represents a substantial change to the capabilities of Ethernet with standardized power. The
power classification information exchanged during negotiation is extended to allow meaningful
power management capability. These enhancements solve the problem of higher power and more
efficient standardized Power over Ethernet (PoE) delivery systems.
Keywords: amendment, DTE power via MDI, Ethernet, IEEE 802.3™, IEEE 802.3bt™, PoE,
Power over Ethernet
This standard is dedicated to the memory
of our friend and colleague Martin Patoka.
The Institute of Electrical and Electronics Engineers, Inc.
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Copyright © 2019 by The Institute of Electrical and Electronics Engineers, Inc.
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PDF: ISBN 978-1-5044-5276-2 STD23390
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ISO/IEC/IEEE 8802-3:2021/Amd.2:2021(E)
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ISO/IEC/IEEE 8802-3:2021/Amd.2:2021(E)
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ISO/IEC/IEEE 8802-3:2021/Amd.2:2021(E)
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ISO/IEC/IEEE 8802-3:2021/Amd.2:2021(E)
The following individuals were officers and members of the IEEE 802.3 Working Group at the beginning of
the IEEE P802.3bt Working Group ballot. 
David J. Law, IEEE 802.3 Working Group Chair
Adam Healey, IEEE 802.3 Working Group Vice-Chair
Pete Anslow, IEEE 802.3 Working Group Secretary
Steven B. Carlson, IEEE 802.3 Working Group Executive Secretary
Valerie Maguire, IEEE 802.3 Working Group Treasurer
Chad Jones, IEEE P802.3bt DTE Power via MDI over 4-Pair Task Force Chair
Koussalya Balasubramanian , IEEE P802.3bt DTE Power via MDI over 4-Pair Task Force
Chief Editor (1st phase)
Lennart Yseboodt, IEEE P802.3bt DTE Power via MDI over 4-Pair Task Force
Chief Editor (2nd phase)
David Abramson, IEEE P802.3bt DTE Power via MDI over 4-Pair Task Force Comment Editor
Justin Abbott Yair Darshan Rita Horner
Shadi Abughazaleh Piers Dawe Bernd Horrmeyer
Victor Hou
Mohammad Ahmed Fred Dawson
Yasuhiro Hyakutake
Eric Baden Wael Diab
Hideki Isono
Amrik Bains Eric DiBiaso
Tom Issenhuth
Thananya Baldwin John Dillard
Kenneth Jackson
Denis Beaudoin Daniel Dillow
Andrew Jimenez
Christian Beia Thuyen Dinh
Peter Jones
Michael Bennett Curtis Donahue
Manabu Kagami
Vipul Bhatt Dan Dove
Upen Kareti
William Bliss Mike Dudek
Keisuke Kawahara
Brad Booth David Dwelley
Yasuaki Kawatsu
Martin Bouda Frank Effenberger
Michael Kelsen
Ralf-Peter Braun Hesham Elbakoury
Scott Kipp
David Estes
Theodore Brillhart
Michael Klempa
John Ewen
Paul Brooks
Curtis Knittle
Ramin Farjad
Alan Brown
Shigeru Kobayashi
Matthew Brown Shahar Feldman
Daniel Koehler
Chris Bullock James Fife
Paul Kolesar
Jairo Bustos Heredia Alan Flatman
Tom Kolze
Adrian Butter Matthias Fritsche
Glen Kramer
Francesco Caggioni Richard Frosch
Hans Lackner
Anthony Calbone Andrew Gardner
Jeffrey Lapak
Clark Carty Claude Gauthier
Mark Laubach
Craig Chabot Ali Ghiasi
Han Hyub Lee
Geoffrey Chacon Simon Joel Goergen
David Lewis
Mandeep Chadha Volker Goetzfried
Jon Lewis
David Chalupsky Zhigang Gong
Mike Peng Li
Jacky Chang Steven Gorshe
Jane Lim
Xin Chang Robert Grow
Dekun Liu
Ahmad Chini Mark Gustlin
Hai-Feng Liu
Keng Hua Chuang Marek Hajduczenia
William Lo
Christopher R. Cole Takehiro Hayashi
Miklos Lukacs
John D’Ambrosia Yasuo Hidaka
Kent Lusted
Not a member of the IEEE 802.3 working group at the beginning of the working group ballot.
Copyright © 2019 IEEE. All rights reserved.

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ISO/IEC/IEEE 8802-3:2021/Amd.2:2021(E)
Jeffery Maki Jean Picard Bharat Tailor
David Malicoat William Powell
Takayuki Tajima
Yonatan Malkiman Rick Rabinovich
Satoshi Takahashi
Arthur Marris Adee Ran
Kohichi Tamura
Takeo Masuda Alon Regev
Brian Teipen
Erdem Matoglu Duane Remein
Geoffrey Thompson
Naoki Matsuda Victor Renteria
Pirooz Tooyserkani
Mick McCarthy Christopher Roth
Albert Tretter
Brett McClellan Salvatore Rotolo
Stephen Trowbridge
Thomas McDermott Toshiaki Sakai
Yoshihiro Tsukamoto
John McDonough Jorge Salinger
Ed Ulrichs
Larry McMillan Sam Sambasivan
Alexander Umnov
Richard Mei Edward Sayre
Sterling A. Vaden
Richard Mellitz Dieter Schicketanz
Stefano Valle
Bryan Moffitt Fred Schindler
Paul Vanderlaan
Ardeshir Mohammadian Hossein Sedarat
Robert Wagner
Paul Mooney Naoshi Serizawa
Dylan Walker
Dale Murray Masood Shariff
Haifei Wang
Henry Muyshondt ramin Shirani
Roy Wang
James Nadolny Tom Skaar
Tongtong Wang
Edward Nakamoto
Jeff Slavick
Xinyuan Wang
Gary Nicholl Daniel Smith
Matthias Wendt
Kevin Noll Scott Sommers
Oded Wertheim
Mark Nowell Yoshiaki Sone
Natalie Wienckowski
David Ofelt Tom Souvignier
Ludwig Winkel
Thomas Palkert
Peter Stassar
Peter Wu
Hui Pan Heath Stewart
Dayin Xu
Sesha Panguluri Robert Stone
Yu Xu
Vasu Parthasarathy David Stover
Jun Yi
Petar Pepeljugoski Junqing Sun
Hayato Yuki
Gerald Pepper
Ken-Ichi Suzuki
Ruben Perez De Aranda Alonso Andrew Zambell
Steve Swanson
Michael Peters Andre Szczepanek Yan Zhuang
Phong Pham William Szeto George Zimmerman
Copyright © 2019 IEEE. All rights reserved.

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ISO/IEC/IEEE 8802-3:2021/Amd.2:2021(E)
The following members of the individual balloting committee voted on this amendment. Balloters may have
voted for approval, disapproval, or abstention.
David Abramson Yasuhiro Hyakutake Adee Ran
Shadi Abughazaleh Noriyuki Ikeuchi R. K. Rannow
Iwan Adhicandra Atsushi Ito Maximilian Riegel
Andrea Agnes Raj Jain Robert Robinson
Thomas Alexander Sang Kwon Jeong Benjamin Rolfe
Dale Amason Chad Jones Veselin Skendzic
Peter Anslow Peter Jones Daniel Smith
John Ballingall Piotr Karocki Dorothy Stanley
Christian Boiger Stuart J. Kerry Thomas Starai
Ralf-Peter Braun Yongbum Kim Heath Stewart
Nancy Bravin Mark Laubach David Stover
Theodore Brillhart David J. Law Walter Struppler
Demetrio Bucaneg Hyeong Ho Lee Mitsutoshi Sugawara
Chris Bullock Joris Lemahieu Kohichi Tamura
Jairo Bustos Heredia Jon Lewis Geoffrey Thompson
William Byrd Shen Loh Nathan Tracy
Steven B. Carlson Miklos Lukacs David Tremblay
Juan Carreon Elvis Maculuba Mark-Rene Uchida
Clark Carty Valerie Maguire Alexander Umnov
Mandeep Chadha Jeffery Maki Dmitri Varsanofiev
Keith Chow Jeffery Masters George Vlantis
Keng Hua Chuang Michael Maytum Khurram Waheed
Ian Crayford Mick McCarthy Dylan Walker
Sourav Dutta Brett McClellan Lisa Ward
Avraham Freedman Thomas McDermott Keith Waters
Matthias Fritsche Richard Mellitz Stephen Webb
Yukihiro Fujimoto Tremont Miao Matthias Wendt
Joel Goergen Charles Moorwood Andreas Wolf
Zhigang Gong Rick Murphy Peter Wu
Eric W. Gray Satoshi Obara Dayin Xu
Randall Groves Thomas Palkert Lennart Yseboodt
Adam Healey Bansi Patel Oren Yuen
Marco Hernandez Arkadiy Peker Andrew Zambell
David Hess Michael Peters Zhen Zhou
Werner Hoelzl Jean Picard George Zimmerman
Rita Horner Rick Pimpinella Pavel Zivny
When the IEEE-SA Standards Board approved this amendment on 27 September 2018, it had the following
Jean-Philippe Faure, Chair
Gary Hoffman, Vice Chair
John D. Kulick, Past Chair
Konstantinos Karachalios, Secretary
Ted Burse
Xiaohui Liu Robby Robson
Guido R. Hiertz Kevin Lu Dorothy Stanley
Christel Hunter Daleep Mohla Mehmet Ulema
Phil Wennblom
Joseph L. Koepfinger* Andrew Myles
Thomas Koshy Paul Nikolich Philip Winston
Howard Wolfman
Hung Ling Ronald C. Petersen
Annette D. Reilly Jingyi Zhou
Dong Liu
*Member Emeritus
Copyright © 2019 IEEE. All rights reserved.

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ISO/IEC/IEEE 8802-3:2021/Amd.2:2021(E)
This introduction is not part of IEEE Std 802.3bt-2018, IEEE Standard for Ethernet—Amendment 2: Physical Layer
and Management Parameters for Power over Ethernet over 4 Pairs.
IEEE Std 802.3™ was first published in 1985. Since the initial publication, many projects have added
functionality or provided maintenance updates to the specifications and text included in the standard. Each
IEEE 802.3 project/amendment is identified with a suffix (e.g., IEEE Std 802.3ba™-2010).
The half duplex Media Access Control (MAC) protocol specified in IEEE Std 802.3-1985 is Carrier Sense
Multiple Access with Collision Detection (CSMA/CD). This MAC protocol was key to the experimental
Ethernet developed at Xerox Palo Alto Research Center, which had a 2.94 Mb/s data rate. Ethernet at
10 Mb/s was jointly released as a public specification by Digital Equipment Corporation (DEC), Intel and
Xerox in 1980. Ethernet at 10 Mb/s was approved as an IEEE standard by the IEEE Standards Board in 1983
and subsequently published in 1985 as IEEE Std 802.3-1985. Since 1985, new media options, new speeds o f
operation, and new capabilities have been added to IEEE Std 802.3. A full duplex MAC protocol was added
in 1997.
Some of the major additions to IEEE Std 802.3 are identified in the marketplace with their project number.
This is most common for projects adding higher speeds of operation or new protocols. For example,
IEEE Std 802.3u™ added 100 Mb/s operation (also called Fast Ethernet), IEEE Std 802.3z added 1000 Mb/s
operation (also called Gigabit Ethernet), IEEE Std 802.3ae added 10 Gb/s operation (also called 10 Gigabit
Ethernet), IEEE Std 802.3ah™ specified access network Ethernet (also called Ethernet in the First Mile) and
IEEE Std 802.3ba added 40 Gb/s operation (also called 40 Gigabit Ethernet) and 100 Gb/s operation (also
called 100 Gigabit Ethernet). These major additions are all now included in and are superseded by
IEEE Std 802.3-2018 and are not maintained as separate documents.
At the date of publication for IEEE Std 802.3bt-2018, IEEE Std 802.3 was composed of the following
IEEE Std 802.3-2018
Section One—Includes Clause 1 through Clause 20 and Annex A through Annex H and Annex 4A.
Section One includes the specifications for 10 Mb/s operation and the MAC, frame formats and servic e
interfaces used for all speeds of operation.
Section Two—Includes Clause 21 through Clause 33 and Annex 22A through Annex 33E. Section
Two includes management attributes for multiple protocols and speed of operation as well as
specifications for providing power over twisted pair cabling for multiple operational speeds. It also
includes general information on 100 Mb/s operation as well as most of the 100 Mb/s Physical Layer
Section Three—Includes Clause 34 through Clause 43 and Annex 36A through Annex 43C. Sectio n
Three includes general information on 1000 Mb/s operation as well as most of the 1000 Mb/s Physical
Layer specifications.
Section Four—Includes Clause 44 through Clause 55 and Annex 44A through Annex 55B. Sectio n
Four includes general information on 10 Gb/s operation as well as most of the 10 Gb/s Physical Layer
Section Five—Includes Clause 56 through Clause 77 and Annex 57A through Annex 76A. Clause 56
through Clause 67 and Clause 75 through Clause 77, as well as associated annexes, specify subscriber
access and other Physical Layers and sublayers for operation from 512 kb/s to 10 Gb/s, and defines
Copyright © 2019 IEEE. All rights reserved.

---------------------- Page: 12 ----------------------
ISO/IEC/IEEE 8802-3:2021/Amd.2:2021(E)
services and protocol elements that enable the exchange of IEEE Std 802.3 format frames between
stations in a subscriber access network. Clause 68 specifies a 10 Gb/s Physical Layer specification.
Clause 69 through Clause 74 and associated annexes specify Ethernet operation over electrical
backplanes at speeds of 1000 Mb/s and 10 Gb/s.
Section Six—Includes Clause 78 through Clause 95 and Annex 83A through Annex 93C. Clause 78
specifies Energy-Efficient Ethernet. Clause 79 specifies IEEE 802.3 Organizationally Specific Link
Layer Discovery Protocol (LLDP) type, length, and value (TLV) information elements. Clause 80
through Clause 95 and associated annexes include general information on 40 Gb/s and 100 Gb/s
operation as well the 40 Gb/s and 100 Gb/s Physical Layer specifications. Clause 90 specifies Ethernet
support for time synchronization protocols.
Section Seven—Includes Clause 96 through Clause 115 and Annex 97A through Annex 115A.
Clause 96 through Cl

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