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Timing and Synchronization for
Time-Sensitive Applications in
Bridged Local Area Networks
Sponsored by the
LAN/MAN Standards Committee
IEEE
3 Park Avenue
New York, NY 10016-5997
USA
30 March 2011
IEEE Computer Society
IEEE Std 802.1AS™-2011
IEEE Standard for
Local and metropolitan area networks—
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
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: ISBN 978-0-7381-6536-3 STD97070
Print: ISBN 978-0-7381-6537-0 STDPD97070
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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.
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, frequency offset, grandmaster, IEEE 802.1AS, phase offset,
synchronization, syntonization, time-aware system
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