Telecommunications and information exchange between information technology systems -- Requirements for local and metropolitan area networks

This standard defines profiles that select features, options, configurations, defaults, protocols and procedures of bridges, stations, and LANs that are necessary to build networks that are capable of transporting fronthaul streams, which are time-sensitive. NOTE—Stream and flow are used as synonyms in this document.1

Télécommunications et échange entre systèmes informatiques -- Exigences pour les réseaux locaux et métropolitains

General Information

Status
Published
Publication Date
30-Jul-2019
Current Stage
6060 - International Standard published
Start Date
27-Jun-2019
Completion Date
31-Jul-2019
Ref Project

RELATIONS

Buy Standard

Standard
ISO/IEC/IEEE 8802-1CM:2019 - Telecommunications and information exchange between information technology systems -- Requirements for local and metropolitan area networks
English language
50 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

INTERNATIONAL ISO/IEC/
STANDARD IEEE
8802-1CM
First edition
2019-07
Telecommunications and information
exchange between information
technology systems — Requirements
for local and metropolitan area
networks —
Part 1CM:
Time-sensitive networking for
fronthaul
Télécommunications et échange entre systèmes informatiques —
Exigences pour les réseaux locaux et métropolitains —
Partie 1CM: Réseaux à temps critique pour fronthaul
Reference number
ISO/IEC/IEEE 8802-1CM:2019(E)
IEEE 2018
---------------------- Page: 1 ----------------------
ISO/IEC/IEEE 8802-1CM:2019(E)
COPYRIGHT PROTECTED DOCUMENT
© IEEE 2018

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 10016-5997, USA
Email: stds.ipr@ieee.org
Published in Switzerland
ii © IEEE 2018 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/IEC/IEEE 8802-1CM:2019(E)
Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical

Commission) form the specialized system for worldwide standardization. National bodies that are

members of ISO or IEC participate in the development of International Standards through technical

committees established by the respective organization to deal with particular fields of technical activity.

ISO and IEC technical committees collaborate in fields of mutual interest. Other international

organizations, governmental and non‐governmental, in liaison with ISO and IEC, also take part in the

work.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for

the different types of ISO documents should be noted (see www.iso.org/directives).

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

Coordinating Committees of the IEEE Standards Association (IEEE‐SA) Standards Board. The IEEE

develops its standards through a consensus development process, approved by the American

National Standards Institute, which brings together volunteers representing varied viewpoints and

interests to achieve the final product. Volunteers are not necessarily members of the Institute and serve

without compensation. While the IEEE administers the process and establishes rules to promote

fairness in the consensus development process, the IEEE does not independently evaluate, test, or

verify the accuracy of any of the information contained in its standards.

Attention is drawn to the possibility that some of the elements of this document may be the subject

of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent

rights. Details of any patent rights identified during the development of the document will be

in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents)

or the IEC list of patent declarations received (see http://patents.iec.ch).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the World

Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT)
see www.iso.org/iso/foreword.html.

ISO/IEC/IEEE 8802‐1CM was prepared by the LAN/MAN of the IEEE Computer Society (as IEEE Std

802.1CM‐2018) and drafted in accordance with its editorial rules. It was adopted, under the “fast‐track

procedure” defined in the Partner Standards Development Organization cooperation agreement between

ISO and IEEE, by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 6,

Telecommunications and information exchange between systems.

A list of all parts in the ISO/IEC/IEEE 8802 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www.iso.org/members.html.
© IEEE 2018 – All rights reserved
iii
---------------------- Page: 3 ----------------------
IEEE Std 802.1CM™-2018
IEEE Standard for
Local and metropolitan area networks—
Time-Sensitive Networking for Fronthaul
Sponsor
LAN/MAN Standards Committee
of the
IEEE Computer Society
Approved 7 May 2018
IEEE-SA Standards Board
---------------------- Page: 4 ----------------------
ISO/IEC/IEEE 8802-1CM:2019(E)

Abstract: This standard defines profiles that select features, options, configurations, defaults,

protocols, and procedures of bridges, stations, and LANs that are necessary to build networks that

are capable of transporting fronthaul streams, which are time sensitive.
Keywords: bridged network, fronthaul, IEEE 802 , IEEE 802.1™, IEEE802.1CM™,

synchronization, time-sensitive networking, TSN, Virtual Local Area Network, VLAN, VLAN Bridge

The Institute of Electrical and Electronics Engineers, Inc.
3 Park Avenue, New York, NY 10016-5997, USA
Copyright © 2018 by The Institute of Electrical and Electronics Engineers, Inc.

All rights reserved. Published 8 June 2018. Printed in the United States of America.

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

Electrical and Electronics Engineers, Incorporated.
Print: ISBN 978-1-5044-4909-0 STD23131
PDF: ISBN 978-1-5044-4910-6 STDPD23131
IEEE prohibits discrimination, harassment, and bullying.

For more information, visit http://www.ieee.org/web/aboutus/whatis/policies/p9-26.html.

No part of this publication may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission

of the publisher.
Copyright © 2018 IEEE. All rights reserved.
---------------------- Page: 5 ----------------------
ISO/IEC/IEEE 8802-1CM:2019(E)
Important Notices and Disclaimers Concerning IEEE Standards Documents

IEEE documents are made available for use subject to important notices and legal disclaimers. These notices

and disclaimers, or a reference to this page, appear in all standards and may be found under the heading

“Important Notices and Disclaimers Concerning IEEE Standards Documents.” They can also be obtained on

request from IEEE or viewed at http://standards.ieee.org/IPR/disclaimers.html.
Notice and Disclaimer of Liability Concerning the Use of IEEE Standards
Documents

IEEE Standards documents (standards, recommended practices, and guides), both full-use and trial-use, are

developed within IEEE Societies and the Standards Coordinating Committees of the IEEE Standards

Association (“IEEE-SA”) Standards Board. IEEE (“the Institute”) develops its standards through a

consensus development process, approved by the American National Standards Institute (“ANSI”), which

brings together volunteers representing varied viewpoints and interests to achieve the final product. IEEE

Standards are documents developed through scientific, academic, and industry-based technical working

groups. Volunteers in IEEE working groups are not necessarily members of the Institute and participate

without compensation from IEEE. While IEEE administers the process and establishes rules to promote

fairness in the consensus development process, IEEE does not independently evaluate, test, or verify the

accuracy of any of the information or the soundness of any judgments contained in its standards.

IEEE Standards do not guarantee or ensure safety, security, health, or environmental protection, or ensure

against interference with or from other devices or networks. Implementers and users of IEEE Standards

documents are responsible for determining and complying with all appropriate safety, security,

environmental, health, and interference protection practices and all applicable laws and regulations.

IEEE does not warrant or represent the accuracy or content of the material contained in its standards, and

expressly disclaims all warranties (express, implied and statutory) not included in this or any other

document relating to the standard, including, but not limited to, the warranties of: merchantability; fitness

for a particular purpose; non-infringement; and quality, accuracy, effectiveness, currency, or completeness of

material. In addition, IEEE disclaims any and all conditions relating to: results; and workmanlike effort.

IEEE standards documents are supplied “AS IS” and “WITH ALL FAULTS.”

Use of an IEEE standard is wholly voluntary. The existence of an IEEE standard does not imply that there

are no other ways to produce, test, measure, purchase, market, or provide other goods and services related to

the scope of the IEEE standard. Furthermore, the viewpoint expressed at the time a standard is approved and

issued is subject to change brought about through developments in the state of the art and comments

received from users of the standard.

In publishing and making its standards available, IEEE is not suggesting or rendering professional or other

services for, or on behalf of, any person or entity nor is IEEE undertaking to perform any duty owed by any

other person or entity to another. Any person utilizing any IEEE Standards document, should rely upon his

or her own independent judgment in the exercise of reasonable care in any given circumstances or, as

appropriate, seek the advice of a competent professional in determining the appropriateness of a given IEEE

standard.
IN NO EVENT SHALL IEEE BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO:
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
OTHERWISE) ARISING IN ANY WAY OUT OF THE PUBLICATION, USE OF, OR RELIANCE UPON
ANY STANDARD, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE AND
REGARDLESS OF WHETHER SUCH DAMAGE WAS FORESEEABLE.
Copyright © 2018 IEEE. All rights reserved.
---------------------- Page: 6 ----------------------
ISO/IEC/IEEE 8802-1CM:2019(E)
Translations

The IEEE consensus development process involves the review of documents in English only. In the event

that an IEEE standard is translated, only the English version published by IEEE should be considered the

approved IEEE standard.
Official statements

A statement, written or oral, that is not processed in accordance with the IEEE-SA Standards Board

Operations Manual shall not be considered or inferred to be the official position of IEEE or any of its

committees and shall not be considered to be, or be relied upon as, a formal position of IEEE. At lectures,

symposia, seminars, or educational courses, an individual presenting information on IEEE standards shall

make it clear that his or her views should be considered the personal views of that individual rather than the

formal position of IEEE.
Comments on standards

Comments for revision of IEEE Standards documents are welcome from any interested party, regardless of

membership affiliation with IEEE. However, IEEE does not provide consulting information or advice

pertaining to IEEE Standards documents. Suggestions for changes in documents should be in the form of a

proposed change of text, together with appropriate supporting comments. Since IEEE standards represent a

consensus of concerned interests, it is important that any responses to comments and questions also receive

the concurrence of a balance of interests. For this reason, IEEE and the members of its societies and

Standards Coordinating Committees are not able to provide an instant response to comments or questions

except in those cases where the matter has previously been addressed. For the same reason, IEEE does not

respond to interpretation requests. Any person who would like to participate in revisions to an IEEE

standard is welcome to join the relevant IEEE working group.
Comments on standards should be submitted to the following address:
Secretary, IEEE-SA Standards Board
445 Hoes Lane
Piscataway, NJ 08854 USA
Laws and regulations

Users of IEEE Standards documents should consult all applicable laws and regulations. Compliance with the

provisions of any IEEE Standards document does not imply compliance to any applicable regulatory

requirements. Implementers of the standard are responsible for observing or referring to the applicable

regulatory requirements. IEEE does not, by the publication of its standards, intend to urge action that is not

in compliance with applicable laws, and these documents may not be construed as doing so.

Copyrights

IEEE draft and approved standards are copyrighted by IEEE under U.S. and international copyright laws.

They are made available by IEEE and are adopted for a wide variety of both public and private uses. These

include both use, by reference, in laws and regulations, and use in private self-regulation, standardization,

and the promotion of engineering practices and methods. By making these documents available for use and

adoption by public authorities and private users, IEEE does not waive any rights in copyright to the

documents.
Copyright © 2018 IEEE. All rights reserved.
---------------------- Page: 7 ----------------------
ISO/IEC/IEEE 8802-1CM:2019(E)
Photocopies

Subject to payment of the appropriate fee, IEEE will grant users a limited, non-exclusive license to

photocopy portions of any individual standard for company or organizational internal use or individual, non-

commercial use only. To arrange for payment of licensing fees, please contact Copyright Clearance Center,

Customer Service, 222 Rosewood Drive, Danvers, MA 01923 USA; +1 978 750 8400. Permission to

photocopy portions of any individual standard for educational classroom use can also be obtained through

the Copyright Clearance Center.
Updating of IEEE Standards documents

Users of IEEE Standards documents should be aware that these documents may be superseded at any time

by the issuance of new editions or may be amended from time to time through the issuance of amendments,

corrigenda, or errata. A current IEEE document at any point in time consists of the current edition of the

document together with any amendments, corrigenda, or errata then in effect.

Every IEEE standard is subjected to review at least every ten years. When a document is more than ten years

old and has not undergone a revision process, it is reasonable to conclude that its contents, although still of

some value, do not wholly reflect the present state of the art. Users are cautioned to check to determine that

they have the latest edition of any IEEE standard.

In order to determine whether a given document is the current edition and whether it has been amended

through the issuance of amendments, corrigenda, or errata, visit the IEEE-SA Website at http://

ieeexplore.ieee.org/ or contact IEEE at the address listed previously. For more information about the IEEE

SA or IEEE’s standards development process, visit the IEEE-SA Website at http://standards.ieee.org.

Errata

Errata, if any, for all IEEE standards can be accessed on the IEEE-SA Website at the following URL: http://

standards.ieee.org/findstds/errata/index.html. Users are encouraged to check this URL for errata

periodically.
Patents

Attention is called to the possibility that implementation of this standard may require use of subject matter

covered by patent rights. By publication of this standard, no position is taken by the IEEE with respect to the

existence or validity of any patent rights in connection therewith. If a patent holder or patent applicant has

filed a statement of assurance via an Accepted Letter of Assurance, then the statement is listed on the IEEE-

SA Website at http://standards.ieee.org/about/sasb/patcom/patents.html. Letters of Assurance may indicate

whether the Submitter is willing or unwilling to grant licenses under patent rights without compensation or

under reasonable rates, with reasonable terms and conditions that are demonstrably free of any unfair

discrimination to applicants desiring to obtain such licenses.

Essential Patent Claims may exist for which a Letter of Assurance has not been received. The IEEE is not

responsible for identifying Essential Patent Claims for which a license may be required, for conducting

inquiries into the legal validity or scope of Patents Claims, or determining whether any licensing terms or

conditions provided in connection with submission of a Letter of Assurance, if any, or in any licensing

agreements are reasonable or non-discriminatory. Users of this standard are expressly advised that

determination of the validity of any patent rights, and the risk of infringement of such rights, is entirely their

own responsibility. Further information may be obtained from the IEEE Standards Association

Copyright © 2018 IEEE. All rights reserved.
---------------------- Page: 8 ----------------------
ISO/IEC/IEEE 8802-1CM:2019(E)
Participants

At the time of approval of this standard, 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, Editor
Ralf Assmann Marina Gutiérrez Karen Randall
Shenghua Bao Stephen Haddock
Maximilian Riegel
Gordon Bechtel Mark Hantel Jessy V. Rouyer
Jens Bierschenk Marc Holness Soheil Samii
Steinar Bjørnstad Lokesh Kabra Atsushi Sato
Christian Boiger Michael Karl Frank Schewe
Paul Bottorff Stephan Kehrer Michael Seaman
Radhakrishna Canchi Hajime Koto Johannes Specht
David Chen
Yizhou Li Patricia Thaler
Feng Chen Christophe Mangin Paul Unbehagen
Weiying Cheng Scott Mansfield Hao Wang
Paul Congdon James McIntosh Tongtong Wang
Rodney Cummings Robert Moskowitz Xinyuan Wang
Hesham ElBakoury Tero Mustala Karl Weber
Norman Finn Tomoki Ohsawa Brian Weis
Mickaël Fontaine
Donald R. Pannell Jordon Woods
Geoffrey Garner Takahiro Yamaura
Walter Pienciak
Eric W. Gray Michael Potts Xiang Yu
Craig Gunther Wei Qiu Nader Zein

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

voted for approval, disapproval, or abstention.
Thomas Alexander Stephen Haddock Glenn Parsons
Butch Anton Marco Hernandez Bansi Patel
Werner Hoelzl
Stefan Aust Clinton Powell
Gordon Bechtel Noriyuki Ikeuchi Alon Regev
Harry Bims Atsushi Ito Maximilian Riegel
Steinar Bjørnstad Raj Jain Robert Robinson
Christian Boiger SangKwon Jeong Jessy V. Rouyer
Piotr Karocki
Demetrio Bucaneg, Jr. Peter Saunderson
William Byrd Stuart Kerry Michael Seaman
Juan Carreon Yongbum Kim Thomas Starai
Keith Chow Mark Laubach Walter Struppler
Todor Cooklev Han Hyub Lee Bo Sun
Rodney Cummings Hyeong Ho Lee Richard Tse
Lars Ellegaard John Lemon Mark-Rene Uchida
Marc Emmelmann Michael Lynch Dmitri Varsanofiev
Yonggang Fang Elvis Maculuba Kari Vierimaa
János Farkas Richard Maiden George Vlantis
Norman Finn Khurram Waheed
Roger Marks
Avraham Freedman John Messenger Lisa Ward
Matthias Fritsche Michael Montemurro Hung-Yu Wei
Yukihiro Fujimoto Nick S. A. Nikjoo Andreas Wolf
Devon Gayle Satoshi Obara Oren Yuen
Eric W. Gray Nader Zein
Robert O’Hara
Randall Groves Zhen Zhou
Copyright © 2018 IEEE. All rights reserved.
---------------------- Page: 9 ----------------------
ISO/IEC/IEEE 8802-1CM:2019(E)

When the IEEE-SA Standards Board approved this standard on 7 May 2018, it had the following

membership:
Jean-Philippe Faure, Chair
Gary Hoffman, Vice Chair
John D. Kulick, Past Chair
Konstantinos Karachalios, Secretary
Chuck Adams Thomas Koshy Robby Robson
Masayuki Ariyoshi Joseph L. Koepfinger* Dorothy Stanley
Adrian Stephens
Ted Burse Kevin Lu
Mehmet Ulema
Stephen Dukes Daleep Mohla
Phil Wennblom
Doug Edwards Damir Novosel
Ronald C. Petersen Howard Wolfman
J. Travis Griffith
Annette D. Reilly Yu Yuan
Michael Janezic
*Member Emeritus
Copyright © 2018 IEEE. All rights reserved.
---------------------- Page: 10 ----------------------
ISO/IEC/IEEE 8802-1CM:2019(E)
Introduction

This introduction is not part of IEEE Std 802.1CM-2018, IEEE Standard for Local and metropolitan area networks—

Time-Sensitive Networking for Fronthaul.

This standard defines profiles that select features, options, configurations, defaults, protocols and procedures

of bridges, stations, and LANs that are necessary to build networks that are capable of transporting fronthaul

streams, which are time-sensitive.
Copyright © 2018 IEEE. All rights reserved.
---------------------- Page: 11 ----------------------
ISO/IEC/IEEE 8802-1CM:2019(E)
Contents

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

1.1 Scope.......................................................................................................................................... 10

1.2 Purpose....................................................................................................................................... 10

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

2. Normative references ........................................................................................................................ 12

3. Definitions ........................................................................................................................................ 13

4. Acronyms and abbreviations ............................................................................................................ 14

5. Conformance ..................................................................................................................................... 16

5.1 Requirements terminology......................................................................................................... 16

5.2 Profile Conformance Statement (PCS) ...................................................................................... 16

5.3 Bridge requirements................................................................................................................... 16

5.4 Bridge options............................................................................................................................ 17

5.5 End station requirements ........................................................................................................... 18

5.6 End station options..................................................................................................................... 18

6. Fronthaul ........................................................................................................................................... 20

6.1 Evolved Universal Terrestrial Radio Access background ......................................................... 21

6.2 Class 1 requirements.................................................................................................................. 21

6.3 Class 2 requirements.................................................................................................................. 23

6.4 Synchronization requirements ................................................................................................... 26

7. Bridge and synchronization functions .............................................................................................. 31

7.1 Latency components .................................................................................................................. 31

7.2 Bridge delay calculation ............................................................................................................ 31

7.3 Frame preemption ...................................................................................................................... 33

7.4 Network synchronization........................................................................................................... 33

7.5 Flow control............................................................................................................................... 37

7.6 Energy Efficient Ethernet .......................................................................................................... 37

8. Fronthaul profiles .............................................................................................................................. 39

8.1 Profile A..................................................................................................................................... 40

8.2 Profile B..................................................................................................................................... 42

9. Synchronization solutions ................................................................................................................. 44

9.1 Solution for Category A+ .......................................................................................................... 44

9.2 Solutions for Category A ........................................................................................................... 44

9.3 Solutions for Category B ........................................................................................................... 44

9.4 Solutions for Category C ........................................................................................................... 44

Annex A (normative) PCS proforma—Time-Sensitive Networking for Fronthaul Profiles......................... 45

Annex B (informative) Delay calculation examples...................................................................................... 55

Annex C (informative) Bibliography............................................................................................................. 59

Copyright © 2018 IEEE. All rights reserved.
---------------------- Page: 12 ----------------------
ISO/IEC/IEEE 8802-1CM:2019(E)
IEEE Std 802.1CM-2018

IEEE Standard for Local and metropolitan area networks—Time-Sensitive Networking for Fronthaul

IEEE Standard for
Local and metropolitan area networks—
Time-Sensitive Networking for Fronthaul
1. Overview
1.1 Scope

This standard defines profiles that select features, options, configurations, defaults, protocols and procedures

of bridges, stations, and LANs that are necessary to build networks that are capable of transporting fronthaul

streams, which are time-sensitive.
NOTE—Stream and flow are used as synonyms in this document.
1.2 Purpose

The purpose of this standard is to specify defaults and profiles that enable the transport of time-sensitive

fronthaul streams in Ethernet bridged networks.
1.3 Introduction

Fronthaul provides connectivity between functional blocks of a cellular base station (BS). The fronthaul

flows between these functional blocks have stringent quality of service requirements. The successful support

of fronthaul flows in a bridged network requires the selection of specific features and options that are

specified in a number of different standards, some developed by IEEE Project 802 , and others (in

particular, those that relate to functionality in OSI layer 3 and above; ISO/IEC 7498:1994 [B11]) developed

by other standards organizations.

This standard selects features and options that support OSI layers 1 and 2 in bridges and end stations from

the following specifications:
— Virtual Local Area Network (VLAN) Bridge specification in IEEE Std 802.1Q.
— MAC service specifications in IEEE Std 802.1AC.

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

standard.
The numbers in brackets correspond to those of the bibliography in Annex C
Information on references can be found in Clause 2.
Copyright © 2018 IEEE. All rights reserved.
---------------------- Page: 13 ----------------------
ISO/IEC/IEEE 8802-1CM:2019(E)
IEEE Std 802.1CM-2018

IEEE Standard for Local and metropolitan area networks—Time-Sensitive Networking for Fronthaul

— 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, and G.8264.
To specify and explain the selection of features and options, this standard:

a) Describes fronthaul requirements (Clause 6), specifying two classes of requirements (6.2, 6.3) that

depend on the BS functional decomposition, and specifying synchronization requirements (6.4) that

apply to both classes.

b) Describes how the operation of bridges and bridged networks affects the quality of service provided

by the fronthaul bridged network (Clause 7), providing details to assist in the calculation of latency

(7.1, 7.2, 7.3), the selection of network synchronization methods (7.4), and the potential impact of

the use of flow control (7.5) and Energy Efficient Ethernet (EEE, 7.6).

c) Specifies two bridge profiles (Clause 8) that support the construction of bridged networks meeting

fronthaul requirements. Profile A (8.1) is applicable to bridges that do not support frame preemption

(7.3), while Profile B (8.2) involves frame preemption
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.