1、BSI Standards PublicationBS ISO/IEC/IEEE 8802-1AS:2014Information technology Telecommunicationsand information exchangebetween systems Local andmetropolitan area networksPart 1AS: Timing and synchronization fortime-sensitive applications in bridged localarea networksBS ISO/IEC/IEEE 8802-1AS:2014 BRI
2、TISH STANDARDNational forewordThis British Standard is the UK implementation of ISO/IEC/IEEE8802-1AS:2014.The UK participation in its preparation was entrusted to TechnicalCommittee IST/6, Data communications.A list of organizations represented on this committee can beobtained on request to its secr
3、etary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 86409 4ICS 35.110Compliance with a British Standard cannot conf
4、er immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2014.Amendments issued since publicationDate T e x t a f f e c t e dReference numberISO/IEC/IEEE 8802-1AS:2014(E)IEEE 2011INTERNATIONAL STANDARD ISO/IEC
5、/IEEE8802-1ASFirst edition2013-02-15Information technology Telecommunications and information exchange between systems Local and metropolitan area networks Part 1AS: Timing and synchronization for time-sensitive applications in bridged local area networks Technologies de linformation Tlcommunication
6、s et change dinformation entre systmes Rseaux locaux et mtropolitains Partie 1AS BS ISO/IEC/IEEE 8802-1AS:2014 IEEE 2011 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, includi
7、ng photocopying, or posting on the internet or an intranet, without permission in writing from ISO, IEC or IEEE at the respective address below. ISO copyright office IEC Central Office Institute of Electrical and Electronics Engineers, Inc. Case postale 56 3, rue de Varemb 3 Park Avenue, New York CH
8、-1211 Geneva 20 CH-1211 Geneva 20 NY 10016-5997, USA Tel. + 41 22 749 01 11 Switzerland E-mail stds.iprieee.org Fax + 41 22 749 09 47 E-mail inmailiec.ch Web www.ieee.org E-mail copyrightiso.org Web www.iec.ch Web www.iso.org Published in Switzerland ii IEEE 2011 All rights reservedBS ISO/IEC/IEEE 8
9、802-1AS:2014 ISO/IEC/IEEE 8802-1AS:2014(E) IEEE 2011 All rights reserved iiiForeword 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
10、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, go
11、vernmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. IEEE Standards documents are developed within the IEEE Societies and the Standards Coordinating C
12、ommittees 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 pr
13、oduct. 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 i
14、nformation contained in its standards. The main task of ISO/IEC JTC 1 is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least 75
15、% of the national bodies casting a vote. Attention is called to the possibility that implementation of this standard may require the use of subject matter covered by patent rights. By publication of this standard, no position is taken with respect to the existence or validity of any patent rights in
16、 connection therewith. ISO/IEEE is not responsible for identifying essential patents or patent claims for which a license may be required, for conducting inquiries into the legal validity or scope of patents or patent claims or determining whether any licensing terms or conditions provided in connec
17、tion with submission of a Letter of Assurance or a Patent Statement and Licensing Declaration Form, 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 infri
18、ngement of such rights, is entirely their own responsibility. Further information may be obtained from ISO or the IEEE Standards Association. ISO/IEC/IEEE 8802-1AS was prepared by the LAN/MAN Standards Committee of the IEEE Computer Society (as IEEE Std 802.1AS-2011). It was adopted by Joint Technic
19、al Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Telecommunications and information exchange between systems, in parallel with its approval by the ISO/IEC national bodies, under the “fast-track procedure” defined in the Partner Standards Development Organization cooperation agr
20、eement between ISO and IEEE. IEEE is responsible for the maintenance of this document with participation and input from ISO/IEC national bodies. ISO/IEC/IEEE 8802 consists of the following parts, under the general title Information technology Telecommunications and information exchange between syste
21、ms Local and metropolitan area networks: Part 11: Wireless LAN medium access control (MAC) and physical layer (PHY) specifications Part 1X: Port-based network access control Part 1AB: Station and media access control connectivity discovery Part 1AE: Media access control (MAC) security Part 1AR: Secu
22、re device identity Part 1AS: Timing and synchronization for time-sensitive applications in bridged local area networks BS ISO/IEC/IEEE 8802-1AS:2014 ISO/IEC/IEEE 8802-1AS:2014(E)iv IEEE 2011 All rights reserved Part 15-4: Wireless medium access control (MAC) and physical layer (PHY) specifications f
23、or low-rate wireless personal area networks (WPANs) BS ISO/IEC/IEEE 8802-1AS:2014 ISO/IEC/IEEE 8802-1AS:2014(E)IEEE Std 802.1AS-2011IEEE Standard for Local and metropolitan area networksTiming and Synchronization for Time-Sensitive Applications in Bridged Local Area NetworksSponsor LAN/MAN Standards
24、 Committeeof theIEEE Computer SocietyApproved 10 February 2011IEEE SA-Standards Board IEEE 2011 All rights reserved vBS ISO/IEC/IEEE 8802-1AS:2014 ISO/IEC/IEEE 8802-1AS:2014(E)The Institute of Electrical and Electronics Engineers, Inc.3 Park Avenue, New York, NY 10016-5997, USACopyright 2011 by the
25、Institute of Electrical and Electronics Engineers, Inc.All rights reserved. Published 30 March 2011. Printed in the United States of America.IEEE, 802, and POSIX are registered trademarks in the U.S. Patent +1 978 750 8400. Permission to photocopy portions of any individual standard for educationalc
26、lassroom use can also be obtained through the Copyright Clearance Center. IEEE 2011 All rights reserved viiBS ISO/IEC/IEEE 8802-1AS:2014 ISO/IEC/IEEE 8802-1AS:2014(E)IntroductionThis standard specifies the protocol and procedures used to ensure that the synchronization requirements aremet for time-s
27、ensitive applications, such as audio and video, across bridged and virtual bridged local areanetworks consisting of LAN media where the transmission delays are fixed and symmetrical; for example,IEEE 802.3TM full-duplex links. This includes the maintenance of synchronized time during normaloperation
28、 and following addition, removal, or failure of network components and network reconfiguration. Itspecifies the use of IEEE 1588TM specifications where applicable in the context of IEEE Std 802.1DTM-2004and IEEE Std 802.1QTM-2005.a Synchronization to an externally provided timing signal (e.g., a rec
29、ognizedtiming standard such as UTC or TAI) is not part of this standard but is not precluded.This is the first edition of IEEE Std 802.1AS.This standard contains state-of-the-art material. The area covered by this standard is undergoing evolution.Revisions are anticipated within the next few years t
30、o clarify existing material, to correct possible errors, andto incorporate new related material. Information on the current state of this and other IEEE 802 standardsmay be obtained from:Secretary, IEEE-SA Standards Board445 Hoes LanePiscataway, NJ 08854USANotice to usersLaws and regulationsUsers of
31、 these documents should consult all applicable laws and regulations. Compliance with theprovisions of this standard does not imply compliance to any applicable regulatory requirements.Implementers of the standard are responsible for observing or referring to the applicable regulatoryrequirements. IE
32、EE does not, by the publication of its standards, intend to urge action that is not incompliance with applicable laws, and these documents may not be construed as doing so. CopyrightsThis document is copyrighted by the IEEE. It is made available for a wide variety of both public and privateuses. The
33、se 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 this documentavailable for use and adoption by public authorities and private users, the IEEE does not waive any rights in
34、copyright to this document.aInformation on references can be found in Clause 2.This introduction is not part of IEEE Std 802.1AS-2011, IEEE Standard for Local and metropolitan area networksTiming and Synchronization for Time-Sensitive Applications in Bridged Local Area Networks.viii IEEE 2011 All ri
35、ghts reservedBS ISO/IEC/IEEE 8802-1AS:2014 ISO/IEC/IEEE 8802-1AS:2014(E)Updating of IEEE documentsUsers of IEEE standards should be aware that these documents may be superseded at any time by theissuance of new editions or may be amended from time to time through the issuance of amendments,corrigend
36、a, or errata. An official IEEE document at any point in time consists of the current edition of thedocument together with any amendments, corrigenda, or errata then in effect. In order to determine whethera given document is the current edition and whether it has been amended through the issuanceof
37、amendments, corrigenda, or errata, visit the IEEE Standards Association website at http:/ieeexplore.ieee.org/xpl/standards.jsp, or contact the IEEE at the address listed previously.For more information about the IEEE Standards Association or the IEEE standards development process,visit the IEEE-SA w
38、ebsite at http:/standards.ieee.org.ErrataErrata, if any, for this and all other standards can be accessed at the following URL: http:/standards.ieee.org/reading/ieee/updates/errata/index.html. Users are encouraged to check this URL forerrata periodically.InterpretationsCurrent interpretations can be
39、 accessed at the following URL: http:/standards.ieee.org/reading/ieee/interp/index.html.PatentsAttention is called to the possibility that implementation of this standard may require use of subject mattercovered by patent rights. By publication of this standard, no position is taken with respect to
40、the existence orvalidity of any patent rights in connection therewith. A patent holder or patent applicant has filed a statementof assurance that it will grant licenses under these rights without compensation or under reasonable rates,with reasonable terms and conditions that are demonstrably free o
41、f any unfair discrimination to applicantsdesiring to obtain such licenses. Other Essential Patent Claims may exist for which a statement of assurancehas not been received. The IEEE is not responsible for identifying Essential Patent Claims for which alicense may be required, for conducting inquiries
42、 into the legal validity or scope of Patents Claims, ordetermining whether any licensing terms or conditions provided in connection with submission of a Letter ofAssurance, if any, or in any licensing agreements are reasonable or non-discriminatory. Users of thisstandard are expressly advised that d
43、etermination of the validity of any patent rights, and the risk ofinfringement of such rights, is entirely their own responsibility. Further information may be obtained fromthe IEEE Standards Association. IEEE 2011 All rights reserved ixBS ISO/IEC/IEEE 8802-1AS:2014 ISO/IEC/IEEE 8802-1AS:2014(E)Cont
44、ents1. Overview 11.1 Scope 11.2 Purpose. 22. Normative references. 33. Definitions . 54. Acronyms and abbreviations . 95. Conformance 115.1 Requirements terminology. 115.2 Protocol Implementation Conformance Statement (PICS) 115.3 Time-aware Bridge and end station requirements . 115.4 MAC-specific t
45、iming and synchronization methods for IEEE 802.3 full-duplex links 125.5 MAC-specific timing and synchronization methods for IEEE Std 802.11-2007 125.6 MAC-specific timing and synchronization methods for IEEE 802.3 EPON 125.7 MAC-specific timing and synchronization methods for coordinated shared net
46、work (CSN). 136. Conventions . 156.1 General. 156.2 Service specification method and notation 156.3 Data types and on-the-wire formats. 157. Time synchronization model for a bridged local area network . 197.1 General. 197.2 Architecture of a time-aware bridged local area network 197.3 Time synchroni
47、zation 217.4 Time-aware system architecture 247.5 Differences between gPTP and PTP 258. IEEE 802.1AS concepts and terminology . 278.1 gPTP domain 278.2 Timescale . 278.3 Communication path asymmetry . 288.4 Messages 298.5 Ports . 308.6 Time-aware system characterization . 329. Application interfaces
48、 379.1 Overview of the interfaces. 379.2 ClockSourceTime interface . 389.3 ClockTargetEventCapture interface 389.4 ClockTargetTriggerGenerate interface 399.5 ClockTargetClockGenerator interface. 409.6 ClockTargetPhaseDiscontinuity interface . 41x IEEE 2011 All rights reservedBS ISO/IEC/IEEE 8802-1AS
49、:2014 ISO/IEC/IEEE 8802-1AS:2014(E)10. Media-independent layer specification 4310.1 Overview 4310.2 Time-synchronization state machines 4410.3 Best master clock selection and announce interval setting state machines . 6710.4 Message attributes 8510.5 Message formats 8710.6 Protocol timing characterization 9511. Media-dependent layer specification for full-duplex, point-to-point links 9911.1 Overview 9911.2 State machines for MD entity specific to full-duplex, point-to-point links. 10511.3 Message attributes 1
