Telecommunications and information exchange between information technology systems — Requirements for local and metropolitan area networks — Part 1CM: Time-sensitive networking for fronthaul — Amendment 1: Enhancements to fronthaul profiles to support new fronthaul interface, synchronization, and syntonization standards

Télécommunications et échange entre systèmes informatiques — Exigences pour les réseaux locaux et métropolitains — Partie 1CM: Réseaux à temps critique pour fronthaul — Amendement 1: Perfectionnement des profils fronthaul pour la prise en charge de la nouvelle interface fronthaul, normes de synchronisation et de recherche

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Published
Publication Date
28-Oct-2021
Current Stage
6060 - International Standard published
Start Date
29-Oct-2021
Completion Date
29-Oct-2021
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INTERNATIONAL ISO/IEC/
STANDARD IEEE
8802-1CM
First edition
2019-07
AMENDMENT 1
2021-10
Telecommunications and information
exchange between information
technology systems — Requirements
for local and metropolitan area
networks —
Part 1CM:
Time-sensitive networking for
fronthaul
AMENDMENT 1: Enhancements to
fronthaul profiles to support new
fronthaul interface, synchronization, and
syntonization standards
Télécommunications et échange entre systèmes informatiques —
Exigences pour les réseaux locaux et métropolitains —
Partie 1CM: Réseaux à temps critique pour fronthaul
AMENDEMENT 1: Perfectionnement des profils fronthaul pour
la prise en charge de la nouvelle interface fronthaul, normes de
synchronisation et de recherche
Reference number
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
© ISO/IEC 2021
© IEEE 2020
---------------------- Page: 1 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
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---------------------- Page: 2 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
Foreword

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ISO/IEC/IEEE 8802-1CM:2019/Amd 1 was prepared by the LAN/MAN of the IEEE Computer Society (as

IEEE Std 802.1CMde-2020) and drafted in accordance with its editorial rules. It was adopted, under the

“fast-track procedure” defined in the Partner Standards Development Organization cooperation

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Copyright © 2020 IEEE. All rights reserved. iii
---------------------- Page: 3 ----------------------
IEEE Std 802.1CMde™-2020
(Amendment to IEEE Std 802.1CM™-2018)
IEEE Standard for
Local and metropolitan area networks—
Time-Sensitive Networking for Fronthaul
Amendment 1: Enhancements to Fronthaul
Profiles to Support New Fronthaul Interface,
Synchronization, and Syntonization Standards
Developed by the
LAN/MAN Standards Committee
of the
IEEE Computer Society
Approved 4 June 2020
IEEE SA Standards Board
---------------------- Page: 4 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
Abstract: Enhancements to fronthaul profiles are defined in this amendment to

IEEE Std 802.1CM™-2018 in order to address new developments in fronthaul interface standards

and in related synchronization and syntonization standards.

Keywords: amendment, bridged network, CPRI, eCPRI, F1, fronthaul, IEEE 802®, IEEE 802.1™,

IEEE 802.1CM™, IEEE 802.1CMde™, synchronization, time-sensitive networking, TSN, Virtual

Local Area Network, VLAN, VLAN Bridge
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PDF: ISBN 978-1-5044-6814-5 STD24245
Print: ISBN 978-1-5044-6815-2 STDPD24245
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ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
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ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
Participants

At the time this amendment was submitted to the IEEE SA Standards Board for approval, the IEEE 802.1

Working Group had the following membership:
Glenn Parsons, Chair
John Messenger, Vice Chair
János Farkas, Chair, Time-Sensitive Networking Task Group
Craig Gunther, Vice Chair, Time-Sensitive Networking Task Group
Satoko Itaya
Astrit Ademaj Jessy Rouyer
Ralf Assmann Yoshihiro Ito Atsushi Sato
Jens Bierschenk Michael Karl Frank Schewe
Christian Boiger Stephan Kehrer Michael Seaman
Paul Bottorff Randy Kelsey Maik Seewald
Feng Chen Hajime Koto Johannes Specht
Weiying Cheng James Lawlis Marius Stanica
Christophe Mangin Guenter Steindl
Paul Congdon
Rodney Cummings Scott Mansfield Xinyuan Wang
Josef Dorr Kenichi Maruhashi Tongtong Wang
Larry McMillan
Hesham Elbakoury Hao Wang
Thomas Enzinger Tero Mustala Karl Weber
Donald Fedyk Roy Myers Brian Weis
Norman Finn Tomoki Ohsawa Ludwig Winkel
Geoffrey Garner Hiroshi Ohue Jordon Woods
Marina Gutierrez Donald Pannell Takahiro Yamaura
Stephen Haddock Michael Potts Nader Zein
Wei Qiu Helge Zinner
Mark Hantel
Marc Holness Karen Randall Harald Zweck
Maximilian Riegel
Copyright © 2020 IEEE. All rights reserved.
---------------------- Page: 9 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)

The following members of the individual balloting committee voted on this amendment. Balloters may have

voted for approval, disapproval, or abstention.
Thomas Alexander Raj Jain Alon Regev
Carol Ansley SangKwon Jeong Maximilian Riegel
Lokesh Kabra
Butch Anton Robert Robinson
Greg Armstrong Srinivas Kandala Silvana Rodrigues
Christian Boiger Randy Kelsey Benjamin Rolfe
Vern Brethour Stuart Kerry Jessy Rouyer
Matthew Brown Evgeny Khorov Frank Schewe
Demetrio Bucaneg Yongbum Kim Veselin Skendzic
William Byrd Hyeong Ho Lee Thomas Starai
Paul Cardinal Kang Lee Walter Struppler
Jennifer Lemon Bo Sun
Juan Carreon
Pin Chang Joseph Levy Karim Traore
Charles Cook Arthur Marris Richard Tse
Marc Emmelmann Jeffery Masters Mark-Rene Uchida
János Farkas Michael Maytum Dmitri Varsanofiev
Avraham Freedman Richard Mellitz John Vergis
Geoffrey Garner Nick S. A. Nikjoo George Vlantis
Lisa Ward
Joel Goergen Satoshi Obara
Randall Groves Glenn Parsons Karl Weber
Craig Gunther Bansi Patel Stuart Whitehead
Stephen Haddock Arumugam Paventhan Scott Willy
Marco Hernandez David Piehler Andreas Wolf
Werner Hoelzl Walter Pienciak Chi Xu
Oliver Holland Clinton Powell Yu Yuan
Woojung Huh R. K. Rannow Oren Yuen
Atsushi Ito Nader Zein

When the IEEE SA Standards Board approved this amendment on 4 June 2020, it had the following

membership:
Gary Hoffman, Chair
Jon Walter Rosdahl, Vice Chair
John D. Kulick, Past Chair
Konstantinos Karachalios, Secretary
Ted Burse David J. Law Mehmet Ulema
Doug Edwards Howard Li Lei Wang
J. Travis Griffith Dong Liu Sha Wei
Grace Gu Kevin Lu Philip B. Winston
Guido R. Hiertz Paul Nikolich Daidi Zhong
Joseph L. Koepfinger* Damir Novosel Jingyi Zhou
Dorothy Stanley
*Member Emeritus
Copyright © 2020 IEEE. All rights reserved.
---------------------- Page: 10 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
Introduction

This introduction is not part of IEEE Std 802.1CMde-2020, IEEE Standard for local and metropolitan area

networks—Time-Sensitive Networking for Fronthaul—Amendment 1: Enhancements to Fronthaul Profiles to

Support New Fronthaul Interface, Synchronization, and Syntonization Standards.

This amendment to IEEE Std 802.1CM-2018 defines enhancements to fronthaul profiles in order to address

new developments in fronthaul interface standards and in related synchronization and syntonization

standards.

The standard contains state-of-the-art material. The area covered by this standard is undergoing evolution.

Revisions are anticipated within the next few years to clarify existing material, to correct possible errors, and

to incorporate new related material. Information on the current revision state of this and other IEEE 802

standards may be obtained from
Secretary, IEEE SA Standards Board
445 Hoes Lane
Piscataway, NJ 08854 USA.
Acknowledgments
Permissions have been granted as follows:

Figure 11.1.1-1 of 3GPP™ TR 38.801 reprinted as Figure C-1 in this document with permission from 3GPP

© 2017. 3GPP™ technical specifications (TSs) and technical reports (TRs) are the property of ARIB, ATIS,

CCSA, ETSI, TSDSI, TTA and TTC who jointly own the copyright in them. They are subject to further

modifications and are therefore provided to you “as is” for information purposes only. Further use is strictly

prohibited.
Copyright © 2020 IEEE. All rights reserved.
---------------------- Page: 11 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
Contents

1. Overview.................................................................................................................................................. 10

1.3 Introduction.................................................................................................................................. 10

2. Normative references................................................................................................................................11

3. Definitions ............................................................................................................................................... 12

4. Acronyms and abbreviations ................................................................................................................... 13

5. Conformance............................................................................................................................................ 14

5.3 Bridge requirements..................................................................................................................... 14

5.4 Bridge options.............................................................................................................................. 14

5.6 End station options....................................................................................................................... 15

6. Fronthaul.................................................................................................................................................. 16

6.1 Radio access technology background .......................................................................................... 16

6.2 Class 1 requirements.................................................................................................................... 16

6.3 Class 2 requirements.................................................................................................................... 17

6.4 Synchronization requirements ..................................................................................................... 19

7. Bridge and synchronization functions ..................................................................................................... 23

7.3 Frame preemption........................................................................................................................ 23

7.4 Network synchronization............................................................................................................. 23

8. Fronthaul profiles..................................................................................................................................... 25

8.1 Profile A....................................................................................................................................... 25

8.2 Profile B....................................................................................................................................... 26

9. Synchronization solutions........................................................................................................................ 27

9.1 Solutions for Category A.............................................................................................................. 27

Annex A (normative) PCS proforma—Time-sensitive networking for Fronthaul Profiles........................... 28

Annex C (informative) Fronthaul interfaces.................................................................................................. 32

Annex D (informative) Bibliography ............................................................................................................ 33

Copyright © 2020 IEEE. All rights reserved.
---------------------- Page: 12 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
IEEE Standard for
Local and metropolitan area networks—
Time-Sensitive Networking for Fronthaul
Amendment 1: Enhancements to Fronthaul
Profiles to Support New Fronthaul Interface,
Synchronization, and Syntonization Standards
The amendment is based on IEEE Std 802.1CM-2018.

NOTE—The editing instructions contained in this amendment define how to merge the material contained therein into

the existing base standard and its amendments to form the comprehensive standard.

The editing instructions are shown in bold italic. Four editing instructions are used: change, delete, insert, and replace.

Change is used to make corrections in existing text or tables. The editing instruction specifies the location of the change

and describes what is being changed by using strikethrough (to remove old material) and underscore (to add new

material). Delete removes existing material. Insert adds new material without disturbing the existing material. Deletions

and insertions may require renumbering. If so, renumbering instructions are given in the editing instruction. Replace is

used to make changes in figures or equations by removing the existing figure or equation and replacing it with a new

one. Editing instructions, change markings, and this NOTE will not be carried over into future editions because the

changes will be incorporated into the base standard.
1. Overview
1.3 Introduction

Change the dashed list of the second paragraph in 1.3 as shown (text of footnote 3 remains unchanged):

— Virtual Local Area Network (VLAN) Bridge specification in IEEE Std 802.1Q.
— MAC service specifications in IEEE Std 802.1AC.
— MAC/PHY technology specifications in IEEE Std 802.3.
— Interspersing express traffic specification in IEEE Std 802.3br.
— Frame preemption specification in IEEE Std 802.1Q.

— Time synchronization and Precision Time Protocol (PTP) specifications in IEEE Std 1588.

— Telecom profile specification in ITU-T G.8275.1, which is based on IEEE Std 1588.

— Synchronous Ethernet specification in ITU-T G.8261, G.8262, G.8262.1, and G.8264.

Notes in text, tables, and figures of a standard are given for information only and do not contain requirements needed to implement

this standard.
Copyright © 2020 IEEE.
...

FINAL
ISO/IEC/IEEE
AMENDMENT
DRAFT
8802-1CM:2019
FDAM 1
ISO/IEC JTC 1/SC 6
Telecommunications and information
Secretariat: KATS
exchange between information
Voting begins on:
2021-04-21 technology systems — Requirements
for local and metropolitan area
Voting terminates on:
2021-09-08
networks —
Part 1CM:
Time-sensitive networking for
fronthaul
AMENDMENT 1: Enhancements to
fronthaul profiles to support new
fronthaul interface, synchronization, and
syntonization standards
Télécommunications et échange entre systèmes informatiques —
Exigences pour les réseaux locaux et métropolitains —
Partie 1CM: Réseaux à temps critique pour fronthaul
AMENDEMENT 1
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/IEC/IEEE 8802-1CM:2019/FDAM 1:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. IEEE 2020
---------------------- Page: 1 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/FDAM 1:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© IEEE 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from IEEE at the address below.

Institute of Electrical and Electronics Engineers, Inc
3 Park Avenue, New York
NY 10016­5997, USA
Email: stds.ipr@ieee.org
Website: www.ieee.org
Published in Switzerland
ii © IEEE 2020 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/FDAM 1:2021(E)
Foreword

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IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating

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---------------------- Page: 3 ----------------------
IEEE Std 802.1CMde™-2020
(Amendment to IEEE Std 802.1CM™-2018)
IEEE Standard for
Local and metropolitan area networks—
Time-Sensitive Networking for Fronthaul
Amendment 1: Enhancements to Fronthaul
Profiles to Support New Fronthaul Interface,
Synchronization, and Syntonization Standards
Developed by the
LAN/MAN Standards Committee
of the
IEEE Computer Society
Approved 4 June 2020
IEEE SA Standards Board
---------------------- Page: 4 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
Abstract: Enhancements to fronthaul profiles are defined in this amendment to

IEEE Std 802.1CM™-2018 in order to address new developments in fronthaul interface standards

and in related synchronization and syntonization standards.

Keywords: amendment, bridged network, CPRI, eCPRI, F1, fronthaul, IEEE 802®, IEEE 802.1™,

IEEE 802.1CM™, IEEE 802.1CMde™, synchronization, time-sensitive networking, TSN, Virtual

Local Area Network, VLAN, VLAN Bridge
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Copyright © 2020 by The Institute of Electrical and Electronics Engineers, Inc.

All rights reserved. Published 16 October 2020. Printed in the United States of America.

IEEE and IEEE 802 are registered trademarks in the U.S. Patent & Trademark Office, owned by The Institute of Electrical and Electronics

Engineers, Incorporated.
PDF: ISBN 978-1-5044-6814-5 STD24245
Print: ISBN 978-1-5044-6815-2 STDPD24245
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---------------------- Page: 5 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
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ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
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ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
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---------------------- Page: 8 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
Participants

At the time this amendment was submitted to the IEEE SA Standards Board for approval, the IEEE 802.1

Working Group had the following membership:
Glenn Parsons, Chair
John Messenger, Vice Chair
János Farkas, Chair, Time-Sensitive Networking Task Group
Craig Gunther, Vice Chair, Time-Sensitive Networking Task Group
Satoko Itaya
Astrit Ademaj Jessy Rouyer
Ralf Assmann Yoshihiro Ito Atsushi Sato
Jens Bierschenk Michael Karl Frank Schewe
Christian Boiger Stephan Kehrer Michael Seaman
Paul Bottorff Randy Kelsey Maik Seewald
Feng Chen Hajime Koto Johannes Specht
Weiying Cheng James Lawlis Marius Stanica
Christophe Mangin Guenter Steindl
Paul Congdon
Rodney Cummings Scott Mansfield Xinyuan Wang
Josef Dorr Kenichi Maruhashi Tongtong Wang
Larry McMillan
Hesham Elbakoury Hao Wang
Thomas Enzinger Tero Mustala Karl Weber
Donald Fedyk Roy Myers Brian Weis
Norman Finn Tomoki Ohsawa Ludwig Winkel
Geoffrey Garner Hiroshi Ohue Jordon Woods
Marina Gutierrez Donald Pannell Takahiro Yamaura
Stephen Haddock Michael Potts Nader Zein
Wei Qiu Helge Zinner
Mark Hantel
Marc Holness Karen Randall Harald Zweck
Maximilian Riegel
Copyright © 2020 IEEE. All rights reserved.
---------------------- Page: 9 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)

The following members of the individual balloting committee voted on this amendment. Balloters may have

voted for approval, disapproval, or abstention.
Thomas Alexander Raj Jain Alon Regev
Carol Ansley SangKwon Jeong Maximilian Riegel
Lokesh Kabra
Butch Anton Robert Robinson
Greg Armstrong Srinivas Kandala Silvana Rodrigues
Christian Boiger Randy Kelsey Benjamin Rolfe
Vern Brethour Stuart Kerry Jessy Rouyer
Matthew Brown Evgeny Khorov Frank Schewe
Demetrio Bucaneg Yongbum Kim Veselin Skendzic
William Byrd Hyeong Ho Lee Thomas Starai
Paul Cardinal Kang Lee Walter Struppler
Jennifer Lemon Bo Sun
Juan Carreon
Pin Chang Joseph Levy Karim Traore
Charles Cook Arthur Marris Richard Tse
Marc Emmelmann Jeffery Masters Mark-Rene Uchida
János Farkas Michael Maytum Dmitri Varsanofiev
Avraham Freedman Richard Mellitz John Vergis
Geoffrey Garner Nick S. A. Nikjoo George Vlantis
Lisa Ward
Joel Goergen Satoshi Obara
Randall Groves Glenn Parsons Karl Weber
Craig Gunther Bansi Patel Stuart Whitehead
Stephen Haddock Arumugam Paventhan Scott Willy
Marco Hernandez David Piehler Andreas Wolf
Werner Hoelzl Walter Pienciak Chi Xu
Oliver Holland Clinton Powell Yu Yuan
Woojung Huh R. K. Rannow Oren Yuen
Atsushi Ito Nader Zein

When the IEEE SA Standards Board approved this amendment on 4 June 2020, it had the following

membership:
Gary Hoffman, Chair
Jon Walter Rosdahl, Vice Chair
John D. Kulick, Past Chair
Konstantinos Karachalios, Secretary
Ted Burse David J. Law Mehmet Ulema
Doug Edwards Howard Li Lei Wang
J. Travis Griffith Dong Liu Sha Wei
Grace Gu Kevin Lu Philip B. Winston
Guido R. Hiertz Paul Nikolich Daidi Zhong
Joseph L. Koepfinger* Damir Novosel Jingyi Zhou
Dorothy Stanley
*Member Emeritus
Copyright © 2020 IEEE. All rights reserved.
---------------------- Page: 10 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
Introduction

This introduction is not part of IEEE Std 802.1CMde-2020, IEEE Standard for local and metropolitan area

networks—Time-Sensitive Networking for Fronthaul—Amendment 1: Enhancements to Fronthaul Profiles to

Support New Fronthaul Interface, Synchronization, and Syntonization Standards.

This amendment to IEEE Std 802.1CM-2018 defines enhancements to fronthaul profiles in order to address

new developments in fronthaul interface standards and in related synchronization and syntonization

standards.

The standard contains state-of-the-art material. The area covered by this standard is undergoing evolution.

Revisions are anticipated within the next few years to clarify existing material, to correct possible errors, and

to incorporate new related material. Information on the current revision state of this and other IEEE 802

standards may be obtained from
Secretary, IEEE SA Standards Board
445 Hoes Lane
Piscataway, NJ 08854 USA.
Acknowledgments
Permissions have been granted as follows:

Figure 11.1.1-1 of 3GPP™ TR 38.801 reprinted as Figure C-1 in this document with permission from 3GPP

© 2017. 3GPP™ technical specifications (TSs) and technical reports (TRs) are the property of ARIB, ATIS,

CCSA, ETSI, TSDSI, TTA and TTC who jointly own the copyright in them. They are subject to further

modifications and are therefore provided to you “as is” for information purposes only. Further use is strictly

prohibited.
Copyright © 2020 IEEE. All rights reserved.
---------------------- Page: 11 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
Contents

1. Overview.................................................................................................................................................. 10

1.3 Introduction.................................................................................................................................. 10

2. Normative references................................................................................................................................11

3. Definitions ............................................................................................................................................... 12

4. Acronyms and abbreviations ................................................................................................................... 13

5. Conformance............................................................................................................................................ 14

5.3 Bridge requirements..................................................................................................................... 14

5.4 Bridge options.............................................................................................................................. 14

5.6 End station options....................................................................................................................... 15

6. Fronthaul.................................................................................................................................................. 16

6.1 Radio access technology background .......................................................................................... 16

6.2 Class 1 requirements.................................................................................................................... 16

6.3 Class 2 requirements.................................................................................................................... 17

6.4 Synchronization requirements ..................................................................................................... 19

7. Bridge and synchronization functions ..................................................................................................... 23

7.3 Frame preemption........................................................................................................................ 23

7.4 Network synchronization............................................................................................................. 23

8. Fronthaul profiles..................................................................................................................................... 25

8.1 Profile A....................................................................................................................................... 25

8.2 Profile B....................................................................................................................................... 26

9. Synchronization solutions........................................................................................................................ 27

9.1 Solutions for Category A.............................................................................................................. 27

Annex A (normative) PCS proforma—Time-sensitive networking for Fronthaul Profiles........................... 28

Annex C (informative) Fronthaul interfaces.................................................................................................. 32

Annex D (informative) Bibliography ............................................................................................................ 33

Copyright © 2020 IEEE. All rights reserved.
---------------------- Page: 12 ----------------------
ISO/IEC/IEEE 8802-1CM:2019/Amd.1:2021(E)
IEEE Standard for
Local and metropolitan area networks—
Time-Sensitive Networking for Fronthaul
Amendment 1: Enhancements to Fronthaul
Profiles to Support New Fronthaul Interface,
Synchronization, and Syntonization Standards
The amendment is based on IEEE Std 802.1CM-2018.

NOTE—The editing instructions contained in this amendment define how to merge the material contained therein into

the existing base standard and its amendments to form the comprehensive standard.

The editing instructions are shown in bold italic. Four editing instructions are used: change, delete, insert, and replace.

Change is used to make corrections in existing text or tables. The editing instruction specifies the location of the change

and describes what is being changed by using strikethrough (to remove old material) and underscore (to add new

material). Delete removes existing material. Insert adds new material without disturbing the existing material. Deletions

and insertions may require renumbering. If so, renumbering instructions are given in the editing instruction. Replace is

used to make changes in figures or equations by removing the existing figure or equation and replacing it with a new

one. Editing instructions, change markings, and this NOTE will not be carried over into future editions because the

changes will be incorporated into the base standard.
1. Overview
1.3 Introduction

Change the dashed list of the second paragraph in 1.3 as shown (text of footnote 3 remains unchanged):

— Virtual Local Area Network (VLAN) Bridge specification in IEEE Std 802.1Q.
— MAC service specifications in IEEE Std 802.1AC.
— MAC/PHY technology specifications in IEEE Std 802.3.
— Interspersing express traffic specification in IEEE Std 802.3br.
— Frame preemption specification in IEEE Std 802.1Q.
— Time synchronization and Precision Time
...

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