Telecommunications and information exchange between systems — Specific requirements for local and metropolitan area networks — Part 3: Standard for Ethernet — Amendment 1: Physical layer specifications and management parameters for 2.5 Gb/s and 5 Gb/s operation over backplane

Télécommunications et échange entre systèmes informatiques — Exigences pour les réseaux locaux et métropolitains — Partie 3: Norme pour Ethernet — Amendement 1: Spécifications de la couche physique et paramètres de gestion pour fonctionnement à 2,5 Gb/s et 5 Gb/s sur fond de panier

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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
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 1:2021(E)

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ISO/IEC/IEEE 8802-3:2021/FDAM 1:2021(E)

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ISO/IEC/IEEE 8802-3:2021/FDAM 1:2021(E)
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ISO/IEC/IEEE 8802-3:2021/Amd.1 was prepared by the LAN/MAN of the IEEE Computer Society (as
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IEEE Std 802.3cb™-2018
(Amendment to IEEE Std 802.3™-2018)
IEEE Standard for Ethernet
Amendment 1: 
Physical Layer Specifications 
and Management Parameters 
for 2.5 Gb/s and 5 Gb/s Operation 
over Backplane
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.1:2021(E)
Abstract: Ethernet Media Access Control (MAC) parameters, Physical Layer specifications, and
management objects for the serial transfer of Ethernet format frames at 2.5 Gb/s and 5 Gb/s over
electrical backplanes are defined in this amendment to IEEE Std 802.3-2018.
Keywords: 2.5 Gigabit Ethernet, 5 Gigabit Ethernet, 2.5GBASE-KX, 2.5GBASE-X, 5GBASE-KR,
5GBASE-R, amendment, AN, Auto-Negotiation, Backplane Ethernet, BASE-R, BASE-X, EEE,
Energy Efficient Ethernet, Ethernet, IEEE 802.3™, IEEE 802.3cb™
The Institute of Electrical and Electronics Engineers, Inc.
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Copyright © 2019 by The Institute of Electrical and Electronics Engineers, Inc.
All rights reserved. Published 4 January 2019. Printed in the United States of America.
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PDF: ISBN 978-1-5044-5278-6 STD23391
Print: ISBN 978-1-5044-5279-3 STDPD23391
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of the publisher.

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ISO/IEC/IEEE 8802-3:2021/Amd.1:2021(E)
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ISO/IEC/IEEE 8802-3:2021/Amd.1:2021(E)
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ISO/IEC/IEEE 8802-3:2021/Amd.1:2021(E)
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ISO/IEC/IEEE 8802-3:2021/Amd.1:2021(E)
The following individuals were officers and members of the IEEE 802.3 Working Group at the beginning of
the IEEE P802.3cb Working Group ballot.
David J. Law, IEEE 802.3 Working Group Chair
Adam Healey, IEEE 802.3 Working Group Vice-Chair
Peter 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
Yong Kim, IEEE P802.3cb Task Force Chair, Phase 1*
Daniel F. Smith, IEEE P802.3cb Task Force Chair, Phase 2
William Lo, IEEE P802.3cb Task Force Editor-in-Chief, Phase 1
Daniel F. Smith, IEEE P802.3cb Task Force Editor-in-Chief, Phase 2
Jim Hatfield, IEEE P802.3cb Task Force Editor, Phase 2*

John Dillard Upen Kareti
Justin Abbott
David Abramson Daniel Dillow Keisuke Kawahara
Shadi Abughazaleh Thuyen Dinh Yasuaki Kawatsu
Mohammad Ahmed Curtis Donahue Michael Kelsen
Scott Kipp
Eric Baden Dan Dove
Michael Klempa
Amrik Bains Mike Dudek
Curtis Knittle
Thananya Baldwin David Dwelley
Shigeru Kobayashi
Denis Beaudoin Frank Effenberger
Daniel Koehler
Christian Beia Hesham Elbakoury
Paul Kolesar
Michael Bennett David Estes
Tom Kolze
Vipul Bhatt John Ewen
Glen Kramer
William Bliss Ramin Farjad
Hans Lackner
Brad Booth Shahar Feldman
Jeffrey Lapak
Martin Bouda James Fife
Mark Laubach
Ralf-Peter Braun Alan Flatman
Han Hyub Lee
Theodore Brillhart Matthias Fritsche
David Lewis
Paul Brooks Richard Frosch
Jon Lewis
Alan Brown Andrew Gardner
Mike Peng Li
Matthew Brown Claude Gauthier
Jane Lim
Chris Bullock Ali Ghiasi
Dekun Liu
Jairo Bustos Heredia Joel Goergen
Hai-Feng Liu
Adrian Butter Volker Goetzfried
Miklos Lukacs
Francesco Caggioni Zhigang Gong
Kent Lusted
Anthony Calbone Steven Gorshe
Jeffery Maki
Clark Carty Robert Grow
David Malicoat
Mark Gustlin
Craig Chabot
Yonatan Malkiman
Marek Hajduczenia
Geoffrey Chacon Simon
Arthur Marris
Takehiro Hayashi
Mandeep Chadha
Takeo Masuda
David Chalupsky Yasuo Hidaka
Erdem Matoglu
Jacky Chang Rita Horner
Naoki Matsuda
Xin Chang Bernd Horrmeyer
Mick McCarthy
Ahmad Chini Victor Hou
Brett McClellan
Keng Hua Chuang Yasuhiro Hyakutake
Thomas McDermott
Christopher R. Cole Hideki Isono
John McDonough
John D'Ambrosia Tom Issenhuth
Larry McMillan
Yair Darshan Kenneth Jackson
Richard Mei
Piers Dawe Andrew Jimenez
Richard Mellitz
Fred Dawson Chad Jones
Bryan Moffitt
Wael Diab Peter Jones
Ardeshir Mohammadian
Eric DiBiaso Manabu Kagami
Paul Mooney
* 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.1:2021(E)
Dale Murray Sam Sambasivan Pirooz Tooyserkani
Henry Muyshondt Edward Sayre Albert Tretter
James Nadolny Dieter Schicketanz Stephen Trowbridge
Edward Nakamoto Fred Schindler
Yoshihiro Tsukamoto
Gary Nicholl Hossein Sedarat
Ed Ulrichs
Kevin Noll Naoshi Serizawa
Alexander Umnov
Mark Nowell Masood Shariff
Sterling A. Vaden
Ramin Shirani
David Ofelt Stefano Valle
Tom Skaar
Thomas Palkert Paul Vanderlaan
Jeff Slavick
Hui Pan Robert Wagner
Sesha Panguluri Scott Sommers Dylan Walker
Vasu Parthasarathy Yoshiaki Sone Haifei Wang
Petar Pepeljugoski Tom Souvignier Roy Wang
Gerald Pepper Peter Stassar Tongtong Wang
Ruben Perez De Aranda Alonso Heath Stewart Xinyuan Wang
Michael Peters Robert Stone Matthias Wendt
Phong Pham David Stover Oded Wertheim
Jean Picard Junqing Sun Natalie Wienckowski
William Powell Ken-Ichi Suzuki Ludwig Winkel
Rick Rabinovich Steve Swanson Peter Wu
Adee Ran Andre Szczepanek Dayin Xu
Alon Regev William Szeto Yu Xu
Duane Remein Bharat Tailor Jun Yi
Victor Renteria Takayuki Tajima Lennart Yseboodt
Christopher Roth Satoshi Takahashi Hayato Yuki
Salvatore Rotolo Kohichi Tamura Andrew Zambell
Toshiaki Sakai Brian Teipen Yan Zhuang
Jorge Salinger Geoffrey Thompson George Zimmerman
The following members of the individual balloting committee voted on this amendment. Balloters may have
voted for approval, disapproval, or abstention.
Shadi Abughazaleh Marco Hernandez Thomas Palkert
David Hess Bansi Patel
Thomas Alexander
Peter Anslow Werner Hoelzl Arumugam Paventhan
Butch Anton Rita Horner Michael Peters
Amrik Bains C. Huntley Rick Pimpinella
Noriyuki Ikeuchi Adee Ran
Ralf-Peter Braun
Nancy Bravin Atsushi Ito Alon Regev
Theodore Brillhart Raj Jain Maximilian Riegel
Matthew Brown SangKwon Jeong Robert Robinson
Piotr Karocki Benjamin Rolfe
Demetrio Bucaneg
Jairo Bustos Heredia Stuart Kerry Daniel F. Smith
William Byrd Yong Kim Thomas Starai
Steven B. Carlson Mark Laubach Walter Struppler
David J. Law
Juan Carreon Mitsutoshi Sugawara
Mandeep Chadha Jon Lewis Junqing Sun
Keith Chow Mike Peng Li Geoffrey Thompson
Keng Hua Chuang Elvis Maculuba Michael Thompson
Steven Tilden
Charles Cook Valerie Maguire
Rodney Cummings Jeffery Maki David Tremblay
Sourav Dutta Arthur Marris Mark-Rene Uchida
Michael Fischer Mick McCarthy Alexander Umnov
Matthias Fritsche Brett McClellan Paul Vanderlaan
Yukihiro Fujimoto Thomas McDermott George Vlantis
Zhigang Gong Larry McMillan Khurram Waheed
James Graba Richard Mellitz Lisa Ward
Eric W. Gray Charles Moorwood Karl Weber
Randall Groves Michael Newman Andreas Wolf
Robert Grow Nick S. A. Nikjoo Peter Wu
Michael Gundlach Paul Nikolich Jun Xu
Marek Hajduczenia Satoshi Obara Oren Yuen
Adam Healey Zhen Zhou
Copyright © 2019 IEEE. All rights reserved.

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ISO/IEC/IEEE 8802-3:2021/Amd.1:2021(E)
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
Joseph L. Koepfinger* Andrew Myles Phil Wennblom
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.1:2021(E)
This introduction is not part of IEEE Std 802.3cb-2018, IEEE Standard for Ethernet—Amendment 1: Physical Laye r
Specifications and Management Parameters for 2.5 Gb/s and 5 Gb/s Operation over Backplane.
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 802.3cb-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.

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ISO/IEC/IEEE 8802-3:2021/Amd.1:2021(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 includes 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 Clause 98, Clause 104, and associated annexes, specify Physical Layers and
optional features for 100 Mb/s and 1000 Mb/s operation over a single twisted pair. Clause 100 throug h
Clause 103, as well as associated annexes, specify Physical Layers for the operation of the EPON
protocol over coaxial distribution networks. Clause 105 through Clause 114 and associated annexes
include general information on 25 Gb/s operation as well as 25 Gb/s Physical Layer specifications.
Clause 99 specifies a MAC merge sublayer for the interspersing of express traffic. Clause 115 and its
associated annex specify a Physical Layer for 1000 Mb/s operation over plastic optical fiber.
Section Eight—Includes Clause 116 through Clause 126 a

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