ANSI IEEE 802.1BA-2011 Local and metropolitan area networks - Audio Video Bridging (AVB) Systems (IEEE Computer Society)《局域网和城域网.音频桥接(AVB)系统》.pdf

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1、 IEEE Standard for Local and metropolitan area networks Audio Video Bridging (AVB) Systems IEEE Computer Society SLponsored by the AN/MAN Standards Committee IEEE 3 Park Avenue New York, NY 10016-5997 USA 30 September 2011 IEEE Std 802.1BA2011 IEEE Std 802.1BA-2011IEEE Standard for Local and metropo

2、litan area networksAudio Video Bridging (AVB) SystemsSponsorLAN/MAN Standards Committeeof theIEEE Computer SocietyApproved 10 September 2011IEEE-SA Standards BoardApproved 7 December 2012American National Standards InstituteAbstract: Profiles that select features, options, configurations, defaults,

3、protocols and proceduresof bridges, stations and LANs that are necessary to build networks that are capable of transportingtime-sensitive audio and/or video data streams are defined in this standard.Keywords: audio video bridging, AVB, Bridged Local Area Networks, IEEE 802.1BA, LANs, localarea netwo

4、rks, MAC Bridges, MANs, metropolitan area networks, time sensitive data streams,Virtual Bridged Local Area Networks, virtual LANs The Institute of Electrical and Electronics Engineers, Inc.3 Park Avenue, New York, NY 10016-5997, USACopyright 2011 by the Institute of Electrical and Electronics Engine

5、ers, Inc.All rights reserved. Published 30 September 2011. Printed in the United States of America.IEEE and 802 are registered trademarks in the U.S. Patent +1 978 750 8400. Permission to photocopy portions of any individual standard for educationalclassroom use can also be obtained through the Copy

6、right Clearance Center.iv Copyright 2011 IEEE. All rights reserved.IntroductionThis 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

7、to incorporate new related material. Information on the current revision state of this and other IEEE 802standards may be obtained fromSecretary, IEEE-SA Standards Board445 Hoes LanePiscataway, NJ 08854USANotice to usersLaws and regulationsUsers of these documents should consult all applicable laws

8、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. IEEE does not, by the publication of its standards, in

9、tend 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. These include both use, by reference, in laws and regul

10、ations, 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 incopyright to this document.Updating of IEEE document

11、sUsers 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,corrigenda, or errata. An official IEEE document at any point in time consists of the current edition of t

12、hedocument 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 issuance ofamendments, corrigenda, or errata, visit the IEEE Standards Association website at http:/ieeexplo

13、re.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 website at http:/standards.ieee.org.This introduction is not part of IEEE Std 802.1BA-2011, IEEE S

14、tandard for Local and metropolitan area networksAudio Video Bridging (AVB) Systems.Copyright 2011 IEEE. All rights reserved. vErrataErrata, if any, for this and all other standards can be accessed at the following URL: http:/standards.ieee.org/findstds/errata/index.html. Users are encouraged to chec

15、k this URL for errataperiodically.InterpretationsCurrent interpretations can be accessed at the following URL: http:/standards.ieee.org/findstds/interps/in-dex.html.PatentsAttention is called to the possibility that implementation of this amendment may require use of subjectmatter covered by patent

16、rights. By publication of this amendment, no position is taken with respect to theexistence or validity of any patent rights in connection therewith. The IEEE is not responsible for identifyingEssential Patent Claims for which a license may be required, for conducting inquiries into the legal validi

17、tyor scope of Patents Claims or determining whether any licensing terms or conditions provided in connectionwith submission of a Letter of Assurance, if any, or in any licensing agreements are reasonable or non-discriminatory. Users of this amendment are expressly advised that determination of the v

18、alidity of anypatent rights, and the risk of infringement of such rights, is entirely their own responsibility. Furtherinformation may be obtained from the IEEE Standards Association.vi Copyright 2011 IEEE. All rights reserved.ParticipantsAt the time this standard was submitted to the IEEE-SA for ap

19、proval, the IEEE 802.1 Working Group hadthe following membership: Tony Jeffree, Chair and EditorPaul Congdon, Vice ChairMichael Johas Teener, Chair, AV Bridging Task GroupZehavit Alon Yafan An Ting Ao Peter Ashwood-Smith Christian Boiger Paul Bottorff Rudolf Brandner Craig Carlson Rodney Cummings Cl

20、audio Desanti Zhemin Ding Donald Eastlake, IIIJanos Farkas Donald Fedyk Norman Finn Ilango Ganga Geoffrey Garner Anoop Ghanwani Mark Gravel Eric Gray Yingjie Gu Craig Gunther Stephen Haddock Hitoshi Hayakawa Hal Keen Srikanth Keesara Yongbum Kim Philippe Klein Oliver Kleineberg Michael Krause Lin Li

21、 Jeff Lynch Ben Mack-Crane David Martin John Messenger John Morris Eric Multanen David Olsen Donald Pannell Glenn Parsons Mark Pearson Joseph Pelissier Rene Raeber Karen Randall Josef Roese Dan Romascanu Jessy Rouyer Ali Sajassi Panagiotis Saltsidis Michael Seaman Rakesh Sharma Kevin Stanton Robert

22、Sultan PatriciaThaler Chait Tumuluri Maarten Vissers Copyright 2011 IEEE. All rights reserved. viiThe following members of the individual balloting committee voted on this standard. Balloters may havevoted for approval, disapproval, or abstention. Thomas Alexander Mark Anderson Butch Anton Lee Armst

23、rong Hugh Barrass Robert BoatrightTomo Bogataj Nancy Bravin William Byrd James CarloJuan Carreon David ChalupskyKeith Chow Henrik Christensen Charles Cook Rodney Cummings Fumio Daido Wael Diab Patrick Diamond Russell Dietz Thomas Dineen Sourav Dutta John Egan C. Fitzgerald Yukihiro Fujimoto John Ful

24、ler Geoffrey Garner Devon Gayle David Goodall Randall Groves Ashwin Gumaste Craig Gunther Oliver Hoffmann David Hunter Atsushi Ito Raj Jain Junghoon JeeAnthony Jeffree Michael Johas Teener Vincent Jones Shinkyo Kaku Piotr Karocki Stuart J. Kerry Max Kicherer Yongbum Kim Jeff KoftinoffBruce Kraemer D

25、avid Landry Juan L. Lazaro Michael Lerer Shen Loh Greg Luri Elvis Maculuba Arthur Marris Jonathon Mclendon Matthew Mora Michael S. Newman Charles Ngethe Nick S. A. NikjooPaul Nikolich Satoshi Obara David Olsen Glenn Parsons Maximilian Riegel Robert Robinson Benjamin Rolfe Jessy Rouyer Randall Safier

26、 Peter Saunderson Bartien Sayogo Gil Shultz Kapil Sood Amjad Soomro Kevin B. Stanton Thomas Starai Adrian Stephens Walter Struppler Joseph Tardo Patricia Thaler David Thompson Geoffrey Thompson Scott Valcourt Prabodh Varshney Karl Weber Oren Yuen George Zimmerman viii Copyright 2011 IEEE. All rights

27、 reserved.When the IEEE-SA Standards Board approved this standard on 10 September 2011, it had the followingmembership:Richard H. Hulett, ChairJohn Kulick, Vice ChairRobert M. Grow, Past ChairJudith Gorman, Secretary*Member EmeritusAlso included are the following nonvoting IEEE-SA Standards Board li

28、aisons:Satish Aggarwal, NRC RepresentativeRichard DeBlasio, DOE RepresentativeMichael Janezic, NIST RepresentativeCatherine BergerIEEE Project EditorPatricia GerdonIEEE Standards Program Manager, Technical Program DevelopmentMasayuki Ariyoshi William Bartley Ted Burse Clint Chaplin Wael Diab Jean-Ph

29、ilippe Faure Alexander Gelman Paul Houz Jim Hughes Joseph L. Koepfinger* David J. Law Thomas Lee Hung Ling Oleg Logvinov Ted Olsen Gary Robinson Jon Walter Rosdahl Sam Sciacca Mike Seavey Curtis Siller Phil Winston Howard L. Wolfman Don WrightCopyright 2011 IEEE. All rights reserved. ixContents1. Ov

30、erview 11.1 Scope 11.2 Purpose. 11.3 Introduction 11.4 Objectives 22. Normative references. 33. Definitions . 54. Acronyms and abbreviations . 65. Architecture of AVB networks 76. AVB functions . 116.1 Energy Efficient Ethernet 116.2 Flow control. 116.3 Frame sizes 126.4 Detection of AVB domains 126

31、.5 Meeting latency targets for SR classes A and B 136.6 Variable data rate LANs 166.7 Basic support for streams. 176.8 Minimum Bridge requirements 186.9 IEEE 802.1AS time-synchronization event message transmission interval 196.10 Effect of hop count on IEEE 802.1AS accuracy . 197. AVB profiles 207.1

32、 Introduction to PCS proformas 207.2 Abbreviations and special symbols 217.3 Instructions for completing the PCS proforma 217.4 Common requirements 23Annex A (informative) Bibliography 31x Copyright 2011 IEEE. All rights reserved.List of figuresFigure 5-1 An AVB network . 7Figure 5-2 AVB domain boun

33、daries created by non-AVB systems 8Figure 5-3 AVB domain boundaries created by different SR class A priorities . 9Figure 5-4 AVB domain boundaries created by different SR class B priorities 10Copyright 2011 IEEE. All rights reserved. xiList of tablesTable 6-1 AVB support in LAN technologies 13Table

34、6-2 Latency targets for SR classes A and B 14Copyright 2011 IEEE. All rights reserved. 1IEEE Standard for Local and metropolitan area networksAudio Video Bridging (AVB) SystemsIMPORTANT NOTICE: This standard is not intended to ensure safety, security, health, or environmental protection.Implementers

35、 of the standard are responsible for determining appropriate safety, security, environmental, and healthpractices or regulatory requirements.This IEEE document is made available for use subject to important notices and legal disclaimers. These notices anddisclaimers appear in all publications contai

36、ning this document and may be found under the heading “ImportantNotice” or “Important Notices and Disclaimers Concerning IEEE Documents.” They can also be obtained on requestfrom IEEE or viewed at http:/standards.ieee.org/IPR/disclaimers.html.1. Overview1.1 ScopeThis standard defines profiles that s

37、elect features, options, configurations, defaults, protocols and proceduresof bridges, stations and LANs that are necessary to build networks that are capable of transporting timesensitive audio and/or video data streams.1.2 PurposeThe purpose of this standard is to specify defaults and profiles tha

38、t manufacturers of LAN equipment canuse to develop AVB-compatible LAN components, and to enable a person not skilled in networking to builda network, using those components, that does not require configuration to provide working audio and/orvideo services.1.3 IntroductionThe successful support of ti

39、me sensitive audio and/or video data streams in a Bridged LAN requires theselection of specific features and options that are specified in a number of different standards, some of whichare standards developed in IEEE 802, and others (in particular, those that relate to functionality in OSI layer3 an

40、d above ISO/IEC 7498-1:1994 B3) that are developed by other bodies. In this standard, it is theselection of features and options that support OSI layer 1 and 2 LAN functionality that is of interest, in orderto specify the requirements for LAN support both in Bridges and the end stations that attach

41、to them.The standards from which features and options are selected by this standard are as follows:a) The VLAN Bridge specification in IEEE Std 802.1Q.IEEE Std 802.1BA-2011 LOCAL AND METROPOLITAN AREA NETWORKS2 Copyright 2011 IEEE. All rights reserved.b) The time synchronization standard, IEEE Std 8

42、02.1AS.c) The MAC and PHY standards specified for the various LAN MAC/PHY technologies, such as IEEEStd 802.3, IEEE Std 802.11, ITU-T G.9960 and ITU-T G.9961 (Powerline), and MoCA.These features and options are selected by means of the profiles described in Clause 7. These profilessupport specific f

43、unctions within an AVB network, such as the Bridges and LAN technologies used to carrythe AV streams, and the end stations that attach to the LAN and that provide the source(s) and thedestination(s) of the stream data.In some cases, there are functions that are needed in order to construct a usable

44、AVB network, but that arenot described in any other standard. In those cases, the technical specification is included in Clause 6 of thisstandard, along with a statement of the conformance requirements associated with the function, so that thefunction can be referenced by a profile in the same way a

45、s functions defined in any other standard.Clause 5 introduces the architecture for AVB systems and AVB networks, and some of the terminology usedin describing them.1.4 ObjectivesThe architecture described in Clause 5, the AVB functions specified in Clause 6, and the profiles specified inClause 7, ar

46、e intended to meet the following objectives:a) Describe the components that can be combined to form an AVB network (i.e., a network whosecomponents cooperate and interoperate to allow the transmission of AV streams) and how thosecomponents can be combined.b) Describe some of the consequences and lim

47、itations for AVB streaming that result from theincorporation of non-AV capable devices in an AVB network.c) Define additional functions that are required for AVB operation that are not otherwise documentedin contributing standards.d) Provide guidance in terms of meeting the end-to-end latency requir

48、ements for successful AVBoperation.e) Define conformance requirements for AVB systems, in terms of the standards to which conformanceis required for the various system components and the optional features of those standards that arerequired to be implemented. These conformance requirements address t

49、he guaranteed delivery, end-to-end latency, and time synchronization requirements for successful AVB operation.AUDIO VIDEO BRIDGING (AVB) SYSTEMS IEEE Std 802.1BA-2011Copyright 2011 IEEE. All rights reserved. 32. Normative referencesThe following referenced documents are indispensable for the application of this document (i.e., they mustbe understood and used, so each referenced document is cited in the text and its relationship to thisdocument is explained). For dated references, only the edition cited applies. For undated references, thelatest edit