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IEEE Std 802.1AS-2011 桥接局域网中时间敏感应用的定时和同步.pdf
IEEE Std 802.1-2011 Front cover
Title page
Introduction
Notice to users
Laws and regulations
Copyrights
Updating of IEEE documents
Errata
Interpretations
Patents
Participants
Contents
List of figures
List of tables
Important notice
1. Overview
1.1 Scope
1.2 Purpose
2. Normative references
3. Definitions
4. Acronyms and abbreviations
5. Conformance
5.1 Requirements terminology
5.2 Protocol Implementation Conformance Statement (PICS)
5.3 Time-aware Bridge and end station requirements
5.4 MAC-specific timing and synchronization methods for IEEE 802.3 full-duplex links
5.5 MAC-specific timing and synchronization methods for IEEE Std 802.11-2007
5.6 MAC-specific timing and synchronization methods for IEEE 802.3 EPON
5.7 MAC-specific timing and synchronization methods for coordinated shared network (CSN)
6. Conventions
6.1 General
6.2 Service specification method and notation
6.3 Data types and on-the-wire formats
7. Time synchronization model for a bridged local area network
7.1 General
7.2 Architecture of a time-aware bridged local area network
7.3 Time synchronization
7.4 Time-aware system architecture
7.5 Differences between gPTP and PTP
8. IEEE 802.1AS concepts and terminology
8.1 gPTP domain
8.2 Timescale
8.3 Communication path asymmetry
8.4 Messages
8.5 Ports
8.6 Time-aware system characterization
9. Application interfaces
9.1 Overview of the interfaces
9.2 ClockSourceTime interface
9.3 ClockTargetEventCapture interface
9.4 ClockTargetTriggerGenerate interface
9.5 ClockTargetClockGenerator interface
9.6 ClockTargetPhaseDiscontinuity interface
10. Media-independent layer specification
10.1 Overview
10.2 Time-synchronization state machines
10.3 Best master clock selection and announce interval setting state machines
10.4 Message attributes
10.5 Message formats
10.6 Protocol timing characterization
11. Media-dependent layer specification for full-duplex, point-to-point links
11.1 Overview
11.2 State machines for MD entity specific to full-duplex, point-to-point links
11.3 Message attributes
11.4 Message formats
11.5 Protocol timing characterization
12. Media-dependent layer specification for IEEE 802.11 links
12.1 Overview
12.2 Messages
12.3 Determination of asCapable
12.4 State machines
12.5 Format of VendorSpecific information element
12.6 Synchronization message interval
13. Media-dependent layer specification for interface to IEEE 802.3 Ethernet passive optical network link
13.1 Overview
13.2 Message attributes
13.3 Message format
13.4 Determination of asCapable
13.5 Layering for IEEE 802.3 EPON links
13.6 Service interface definitions
13.7 MD entity global variables
13.8 State machines
13.9 Message transmission intervals
14. Timing and synchronization management
14.1 General
14.2 Default Parameter Data Set
14.3 Current Parameter Data Set
14.4 Parent Parameter Data Set
14.5 Time Properties Parameter Data Set
14.6 Port Parameter Data Set
14.7 Port Parameter Statistics
14.8 Acceptable Master Table Parameter Data Set
15. Managed object definitions
15.1 Internet Standard Management Framework
15.2 Structure of the MIB
15.3 Security considerations
15.4 Textual conventions defined in this MIB
15.5 IEEE 802.1AS MIB module
Annex A (normative)
Protocol Implementation Conformance Statement (PICS) proforma
A.1 Introduction
A.2 Abbreviations and special symbols
A.3 Instructions for completing the PICS proforma
A.4 PICS proforma for IEEE Std 802.1AS-2011
A.5 Major capabilities
A.6 Media access control methods
A.7 Minimal time-aware system
A.8 Signalling
A.9 Best master clock
A.10 Grandmaster-capable system
A.11 Media-independent master
A.12 Media-dependent, full-duplex, point-to-point link
A.13 Media-dependent IEEE 802.11 link
A.14 Media-dependent IEEE 802.3 EPON link
A.15 Media-dependent CSN link
A.16 Media-dependent MoCA link
A.17 Media-dependent ITU-T G.hn link
Annex B (normative)
Performance requirements
B.1 LocalClock requirements
B.2 Time-aware system requirements
B.3 End-to-end time-synchronization performance
B.4 End-to-end jitter and wander performance
Annex C (informative)
Time-scales and epochs
C.1 Overview
C.2 TAI and UTC
C.3 NTP and GPS
C.4 Time-scale conversions
C.5 Time zones and GMT
Annex D (normative)
State diagram notation
Annex E (normative)
Media-dependent layer specification for CSN Network
E.1 Overview
E.2 Coordinated Shared Network characteristics
E.3 Layering for CSN links
E.4 Path delay measurement over a CSN backbone
E.5 Synchronization messages
E.6 Specific CSN requirements
E.7 Grandmaster capability
E.8 CSN clock and node requirements
Annex F (informative)
PTP profile included in this standard
F.1 Identification
F.2 PTP attribute values
F.3 PTP options
F.4 LocalClock and time-aware system performance requirements
Annex G (informative) Bibliography
IEEE Standard for
Local and metropolitan area networks—
Timing and Synchronization for
Time-Sensitive Applications in
Bridged Local Area Networks
IEEE Computer Society
Sponsored by the
LAN/MAN Standards Committee
IEEE
3 Park Avenue
New York, NY 10016-5997
USA
30 March 2011
IEEE Std 802.1AS™-2011
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IEEE Std 802.1AS™-2011
IEEE Standard for
Local and metropolitan area networks—
Timing and Synchronization for
Time-Sensitive Applications in
Bridged Local Area Networks
Sponsor
LAN/MAN Standards Committee
of the
IEEE Computer Society
Approved 10 February 2011
IEEE SA-Standards Board
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Abstract: This standard defines a protocol and procedures for the transport of timing over bridged
and virtual bridged local area networks. It includes the transport of synchronized time, the selection
of the timing source (i.e., best master), and the indication of the occurrence and magnitude of timing
impairments (i.e., phase and frequency discontinuities).
Keywords: best master,
synchronization, syntonization, time-aware system
frequency offset, grandmaster,
IEEE 802.1AS, phase offset,
The Institute of Electrical and Electronics Engineers, Inc.
3 Park Avenue, New York, NY 10016-5997, USA
Copyright © 2011 by the 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 & Trademark Office, owned by the Institute of Electrical
and Electronics Engineers, Incorporated.
MoCA is a registered trademark of the Multimedia over Coax Alliance.
PDF:
Print:
ISBN 978-0-7381-6536-3
ISBN 978-0-7381-6537-0
STD97070
STDPD97070
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Introduction
This introduction is not part of IEEE Std 802.1AS-2011, IEEE Standard for Local and metropolitan area networks—
Timing and Synchronization for Time-Sensitive Applications in Bridged Local Area Networks.
This standard specifies the protocol and procedures used to ensure that the synchronization requirements are
met for time-sensitive applications, such as audio and video, across bridged and virtual bridged local area
networks 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 normal
operation and following addition, removal, or failure of network components and network reconfiguration. It
specifies the use of IEEE 1588TM specifications where applicable in the context of IEEE Std 802.1DTM-2004
and IEEE Std 802.1QTM-2005.a Synchronization to an externally provided timing signal (e.g., a recognized
timing 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 to clarify existing material, to correct possible errors, and
to incorporate new related material. Information on the current state of this and other IEEE 802® standards
may be obtained from:
Secretary, IEEE-SA Standards Board
445 Hoes Lane
Piscataway, NJ 08854
USA
Notice to users
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aInformation on references can be found in Clause 2.
iv
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v
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Participants
At the time this standard was submitted to the IEEE-SA Standards Board for approval, the IEEE 802.1
Working Group had the following membership:
Tony Jeffree, IEEE 802.1 Working Group Chair
Paul Congdon, IEEE 802.1 Vice Chair
Michael Johas Teener, Audio-Video Bridging Task Group Chair
Geoffrey Garner, Editor
IEEE 802.1AS Clause Editors
Christopher Hall, Clause 5, Annex A
Kevin B. Stanton, Clause 5, Clause 12, Annex A
Michael Johas Teener, Clause 7
Yongbum Kim, Clause 15
Yuanqiu Luo, Frank Effenberger, Clause 13
Philippe Klein, Annex F
Zehavit Alon
Ting Ao
Wanqun Bao
Paul Bottorff
Rudolf Brandner
Craig Carlson
Diego Crupnicoff
Claudio Desanti
Zhemin Ding
Donald Eastlake, 3rd
Janos Farkas
Donald Fedyk
Norman Finn
Ilango Ganga
Anoop Ghanwani
Eric Gray
Craig Gunther
Stephen Haddock
Daya Kamath
Hal Keen
Michael Krause
Vinod Kumar
Lin Li
Ben Mack-Crane
Menu Menuchehry
John Messenger
John Morris
Eric Multanen
David Olsen
Donald Pannell
Glenn Parsons
Joseph Pelissier
Karen Randall
Derek Rohde
Dan Romascanu
Jessy Rouyer
Panagiotis Saltsidis
Michael Seaman
Rakesh Sharma
Takeshi Shimizu
Nurit Sprecher
Robert Sultan
Patricia Thaler
Chien-Hsien Wu
vi
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