Information 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 — Technical Corrigendum 1: Technical and editorial corrections

Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseaux locaux et métropolitains — Partie 1AS: Temporisation et synchronisation pour les applications sensibles au temps des réseaux locaux pontés — Rectificatif technique 1: Titre manque

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ISO/IEC/IEEE 8802-1AS:2021/Cor 1:2023 - Information 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 — Technical Corrigendum 1: Technical and editorial corrections Released:13. 01. 2023
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INTERNATIONAL STANDARD ISO/IEC/IEEE 8802-
1AS:2021
TECHNICAL CORRIGENDUM 1
Published 2023-01

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION • МЕЖДУНАРОДНАЯ ОРГАНИЗАЦИЯ ПО СТАНДАРТИЗАЦИИ • ORGANISATION INTERNATIONALE DE NORMALISATION

INTERNATIONAL ELECTROTECHNICAL COMMISSION • МЕЖДУНАРОДНАЯ ЭЛЕКТРОТЕХНИЧЕСКАЯ КОМИССИЯ • COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE

Information 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
TECHNICAL CORRIGENDUM 1: Technical and editorial corrections

Technologies de l'information — Télécommunications et échange d'information entre systèmes — Réseaux

locaux et métropolitains — Exigences spécifiques —

Partie 1AS: Temporisation et synchronisation pour les applications sensibles au temps des réseaux locaux

pontés
RECTIFICATIF TECHNIQUE 1:

Technical Corrigendum 1 to ISO/IEC/IEEE 8802-1AS:2021/Cor 1 was prepared by Joint Technical

Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Telecommunications and

information exchange between systems, in collaboration with IEEE. The identical text is published

as IEEE 802.1AS-2020/Cor 1-2021.
ICS 35.100.60 Ref. No. ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
© IEEE 2021 – All rights reserved
Published in Switzerland
---------------------- Page: 1 ----------------------
IEEE Std 802.1AS™-2020/Cor 1-2021
(Corrigendum to IEEE Std 802.1AS-2020)
IEEE Standard for
Local and Metropolitan Area Networks—
Timing and Synchronization for
Time-Sensitive Applications
Corrigendum 1: Technical and
Editorial Corrections
Developed by the
LAN/MAN Standards Committee
of the
IEEE Computer Society
Approved 8 December 2021
IEEE SA Standards Board
---------------------- Page: 2 ----------------------
ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)

Abstract: Technical and editorial corrections to IEEE Std 802.1AS™-2020 are provided in this

corrigendum.

Keywords: best master, frequency offset, Grandmaster Clock, Grandmaster PTP Instance,

PTPEnd Instance, PTP Relay Instance, IEEE802.1AS™, phase offset, synchronization,

syntonization, time-aware system
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ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
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ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
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ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)

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ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
Participants

At the time this revision was submitted to the IEEE SA Standards Board for approval, the IEEE 802.1

Working Group had the following membership:
Glenn Parsons, Chair
Jessy Rouyer, Vice Chair
Paul Congdon, Maintenance Task Group Chair
Geoffrey Garner, Editor
Astrit Ademaj Daniel Hopf Karen Randall
Ralf Assmann Woojung Huh Maximilian Riegel
Satoko Itaya
Venkat Arunarthi Silvana Rodrigues
Rudy Belliardi Yoshihiro Ito Atsushi Sato
Christian Boiger Michael Karl Frank Schewe
Stephan Kehrer
Paul Bottorff Michawl Seaman
Radhakrishna Canchi Marcel Kiessling Malik Seewald
Feng Chen Randy Kelsey Ramesh Sivakolundu
Abhijit Choudhury Gavin Lai Johannes Specht
Paul Congdon James Lawlis
Marius Stanica
Rodney Cummings Joao Lopes Guenter Steindl
Josef Dorr Lily Lv Liyang Sun
Christophe Mangin
Hesham Elbakoury Karim Traore
Anna Engelmann Scott Mansfield Max Turner
Thomas Enzinger Kenichi Maruhashi Balazs Varga
János Farkas Olaf Mater Ganesh Venkatesan
Donald Fedyk David McCall Tongton Wang
Norman Finn Lary McMillan Xinuyan Wang
Geoffrey Garner John Messenger Karl Weber
Amrit Gopal Hiroki Nakano
Leon Wessels
Craig Gunther Hiroshi Ohue Ludwig Winkel
Marina Gutierrez Donald R. Pannell Jordan Woods
Razvan Petre
Stephen Haddock Takahiro Yamaura
Mark Hantel Michael Potts Yue Yin
Jerome Henry Dieter Proell Uwe Zeier
Marc Holness Wei Qiu Nader Zein
Copyright © 2021 IEEE. All rights reserved.
---------------------- Page: 8 ----------------------
ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)

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

approval, disapproval, or abstention.
Greg Armstrong Yasuhiko Inoue Clinton Powell
Pranav Jha
Douglas Arnold Dieter Proell
Christian Boiger Lokesh Kabra Alon Regev
Ashley Butterworth Piotr Karocki Denis Reilly
William Byrd Stephan Kehrer Maximilian Riegel
Paul Cardinal Randy Kelsey Silvana Rodrigues
Paul Congdon Stuart Kerry Benjamin Rolfe
Rodney Cummings Evgeny Khorov Jessy Rouyer
János Farkas Yongbum Kim Eugene Stoudenmire
Donald Fedyk Hyeong Ho Lee Walter Struppler
Avraham Freedman Ting Li Max Turner
Geoffrey Garner Jonathon Mclendon John Vergis
Devon Gayle Rajesh Murthy Lisa Ward
Jalal Gohari Satoshi Obara Stephen Webb
Craig Gunther Glenn Parsons Karl Weber
Marek Hajduczenia Bansi Patel Scott Willy
Marco Hernandez Arumugam Paventhan Yu Yuan
Oliver Holland Oren Yuen

When the IEEE SA Standards Board approved this standard on 8 December 2021, it had the following

membership:
Gary Hoffman, Chair
Jon Walter Rosdahl, Vice Chair
John D. Kulick, Past Chair
Konstantinos Karachalios, Secretary
Edward A. Addy Howard Li Mehmet Ulema
Doug Edwards Daozhuang Lin Lei Wang
Ramy Ahmed Fathy KevinLu F. Keith Waters
J. Travis Griffith Daleep C. Mohla Karl Weber
Thomas Koshy Chenhui Niu Sha Wei
Joseph L. Koepfinger* Damir Novosel Howard Wolfman
David J. Law Annette Reilly Daidi Zhong
Dorothy Stanley
*Member Emeritus
Copyright © 2021 IEEE. All rights reserved.
---------------------- Page: 9 ----------------------
ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
Introduction

This introduction is not part of IEEE Std 802.1AS-2020/Cor 1-2021, IEEE Standard for Local and Metropolitan Area

Networks—Timing and Synchronization for Time-Sensitive Applications—Corrigendum 1: Technical and

Editorial Corrections.

The first edition of IEEE Std 802.1AS was published in 2011. A first corrigendum, IEEE Std 802.1AS-2011/

Cor1-2013, provided technical and editorial corrections. A second corrigendum, IEEE Std 802.1AS-2011/

Cor2-2015 provided additional technical and editorial corrections.

The second edition, IEEE Std 802.1AS-2020, added support for multiple gPTP domains, Common Mean

Link Delay Service, external port configuration, and Fine Timing Measurement for 802.11 transport.

Backward compatibility with IEEE Std 802.1AS-2011 was maintained.

This corrigendum, IEEE Std 802.1AS-2020/Cor1-2021, provides technical and editorial corrections.

Copyright © 2021 IEEE. All rights reserved.
---------------------- Page: 10 ----------------------
ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
Contents

5. Conformance.............................................................................................................................................. 14

5.4 PTP Instance requirements and options................................................................................. 14

5.5 MAC-specific timing and synchronization methods for full-duplex IEEE 802.3 links ........ 14

10. Media-independent layer specification.................................................................................................... 16

10.2 Time-synchronization state machines.................................................................................... 16

10.3 Best master clock selection, external port configuration, and announce interval setting 

state machines ........................................................................................................................ 19

10.4 State machines related to signaling gPTP capability ............................................................. 23

11. Media-dependent layer specification for full-duplex point-to-point links............................................... 26

11.2 State machines for MD entity specific to full-duplex point-to-point links............................ 26

12. Media-dependent layer specification for IEEE 802.11 links...................................................................29

12.5 State machines ....................................................................................................................... 29

16. Media-dependent layer specification for CSN......................................................................................... 30

16.5 Synchronization messages ..................................................................................................... 30

Annex A (normative) Protocol Implementation Conformance Statement (PICS) proforma ........................ 31

Copyright © 2021 IEEE. All rights reserved.
---------------------- Page: 11 ----------------------
ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
Figures

Figure 10-2 Time-synchronization state machines—overview and interrelationships ................................. 17

Figure 10-19 AnnounceIntervalSetting state machine .................................................................................. 20

Figure 10-20 SyncIntervalSetting state machine .......................................................................................... 22

Figure 10-23 GptpCapableIntervalSetting state machine ............................................................................. 24

Figure 11-4 Detail of MD entity time-synchronization state machines for full-duplex point-to-point

links....................................................................................................................................... 26

Figure 11-9 MDPdelayReq state machine .................................................................................................... 27

Copyright © 2021 IEEE. All rights reserved.
---------------------- Page: 12 ----------------------
ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
Tables

Table 16-1 CSN TLV ................................................................................................................................... 30

Copyright © 2021 IEEE. All rights reserved.
---------------------- Page: 13 ----------------------
ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
IEEE Standard for
Local and metropolitan area networks—
Timing and Synchronization for 
Time-Sensitive Applications
Corrigendum 1: Technical and 
Editorial Corrections
[This corrigendum is based on IEEE Std 802.1AS™-2020.]

NOTE—The editing instructions contained in this amendment define how to merge the material contained therein into

the existing base standard and its amendments to form the comprehensive standard.

The editing instructions are shown in bold italic. Four editing instructions are used: change, delete, insert, and replace.

Change is used to make corrections in existing text or tables. The editing instruction specifies the location of the change

and describes what is being changed by using strikethrough (to remove old material) and underscore (to add ne w

material). Delete removes existing material. Insert adds new material without disturbing the existing material. Deletions

and insertions may require renumbering. If so, renumbering instructions are given in the editing instruction. Replace is

used to make changes in figures or equations by removing the existing figure or equation and replacing it with a ne w

one. Editing instructions, change markings, and this NOTE will not be carried over into future editions because the

changes will be incorporated into the base standard.

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

Copyright © 2021 IEEE. All rights reserved.
---------------------- Page: 14 ----------------------
ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
IEEE Std 802.1AS-2020/Cor 1-2021

IEEE Standard for Local and Metropolitan Area NetworksTiming and Synchronization for Time-Sensitive Applications

Corrigendum 1: Technical and Editorial Corrections
5. Conformance
5.4 PTP Instance requirements and options
Change 5.4.1 as follows:
5.4.1 Summary of requirements
An implementation of a PTP Instance shall:

a) Implement the generalized precision time protocol (gPTP) requirements specified in Clause 8.

b) Support the requirements for time-synchronization state machines (10.1.2, 10.2.1, 10.2.2, 10.2.3,

10.2.4, 10.2.5, and 10.2.6).
c) Support at least one PTP Port.

d) On each supported PTP Port, implement the PortSyncSyncReceive state machine (10.2.8).

e) Implement the ClockSlaveSync state machine (10.2.13).
f) Support the following best master clock algorithm (BMCA) requirements:

1) Implement the BMCA (10.3.1.1, 10.3.1.2, 10.3.2, 10.3.3, 10.3.4, 10.3.5, 10.3.6, 10.3.8, and

10.3.10).

2) For domain 0, implement specifications for externalPortConfigurationEnabled value of FALSE

(10.3.1).
3) Implement the PortAnnounceReceive state machine (10.3.11).
4) Implement the PortAnnounceInformation state machine (10.3.12).
5) Implement the PortStateSelection state machine (10.3.13).

6) Have the BMCA as the default mode of operation, with externalPortConfiguration FALSE, on

domain 0.

7) Implement at least one of the possibilities for externalPortConfigurationEnabled (i.e., FALSE,

meaning the BMCA is used, and TRUE, meaning external port configuration is used) on

domains other than domain 0.
g) Implement the SiteSyncSync state machine (10.2.7).
h) Implement the state machines related to signaling gPTP capability (10.4).

i) For receipt of all messages and for transmission of all messages except Announce (see 10.6.3) and

Signaling (see 10.6.4), support the message requirements as specified in 10.5, 10.6, and 10.7.

j) Support the performance requirements in B.1 and B.2.4.
Change 5.5 as follows:
5.5 MAC-specific timing and synchronization methods for full-duplex IEEE 802.3
links

An implementation of a time-aware system with IEEE 802.3 media access control (MAC) services to

physical ports shall:

a) Support full-duplex operation, as specified in 4.2 and Annex 4A of IEEE Std 802.3-2018.

b) Support the requirements as specified in Clause 11 [with the exception of requirements more

specifically addressed in this subclause (5.5)].
c) Implement the SyncIntervalSetting state machine (10.3.18).
Copyright © 2021 IEEE. All rights reserved.
---------------------- Page: 15 ----------------------
ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
IEEE Std 802.1AS-2020/Cor 1-2021

IEEE Standard for Local and Metropolitan Area NetworksTiming and Synchronization for Time-Sensitive Applications

Corrigendum 1: Technical and Editorial Corrections

d) Provide the Common Mean Link Delay Service (CMLDS) if the time-aware system implements

more than one domain, as specified in 11.2.17 and 11.2.18.

An implementation of a PTP Instance with IEEE 802.3 MAC services to physical ports may:

e) Support asymmetry measurement mode as specified in 10.3.12, 10.3.13, 10.3.16, 11.2.14, 11.2.15 ,

11.2.19, and 14.8.45.
f) Support one-step capability on receive as specified in 11.2.14.
g) Support one-step capability on transmit as specified in 11.2.15.
h) Support the OneStepTxOperSetting state machine specified in 11.2.16.
i) Support propagation delay averaging, as specified in 11.2.19.3.4.

j) Provide the Common Mean Link Delay Service (CMLDS) if the time-aware system implements

only one domain, as specified in 11.2.17 and 11.2.18.
Copyright © 2021 IEEE. All rights reserved.
---------------------- Page: 16 ----------------------
ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
IEEE Std 802.1AS-2020/Cor 1-2021

IEEE Standard for Local and Metropolitan Area NetworksTiming and Synchronization for Time-Sensitive Applications

Corrigendum 1: Technical and Editorial Corrections
10. Media-independent layer specification
10.2 Time-synchronization state machines
10.2.1 Overview

Replace Figure 10-2 with the following figure and insert NOTE immediately after Figure 10-2 as shown:

Copyright © 2021 IEEE. All rights reserved.
---------------------- Page: 17 ----------------------
ISO/IEC/IEEE 8802-1AS:2021/Cor.1:2023(E)
IEEE Std 802.1AS-2020/Cor 1-2021

IEEE Standard for Local and Metropolitan Area NetworksTiming and Synchronization for Time-Sensitive Applications

Corrigendum 1: Technical and Editorial Corrections
ClockMasterSyncReceive
(per ClockMaster entity)
masterTime, localTime, rcvdClockSourceReq,
rcvdClockSourceReqPtr, rcvdLocalClockTick,
localClockTickInterval, gmRateRatio,
LocalClock
clockSourceTimeBaseIndicator
masterTime, localTime,
gmRateRatio,
currentTime
clockSourceTimeBaseIndicator
ClockMasterSyncOffset
gmPresent, selectedState
(per ClockMaster entity)
[rcvdPSSyncPtr->localPortNumber]
networkTime, networkTimeOld, clockSlaveTime,
rcvdClockSlaveTime, selectedState[0],
From MD Entity
clockSourcePhaseOffset, clockSourceFreqOffset
MDSyncReceive
clockSourcePhaseOffset,
clockSourceFreqOffset
ClockMasterSyncSend PortSyncSyncReceive
(per ClockMaster entity) (per PortSync entity)
rcvdMDSync, rcvdMDSyncPtr, txPSSyncPtr,
syncSendTime, clockMasterSyncInterval,
rateRatio, portOper, ptpPortEnabled,
txPSSyncPtr, rateRatio
asymmetryMeasurementMode
PortSyncSync PortSyncSync
SiteSyncSync (per SiteSync entity)
RcvdPSSync, rcvdPSSyncPtr, txPSSyncPtr
PortSyncSync
PortSyncSync
ClockSlaveSync PortSyncSyncSend
(per ClockSlave entity) (per PortSync entity)
clockSlaveTime, syncReceiptTime,
rcvdPSSync, rcvdPSSyncPtr, rcvdTimestamp,
syncReceiptLocalTime, gmTimeBaseIndicator,
txMDSyncPtr, txFollowUpPtr, syncReceiptTimeoutTime,
lastGmPhaseChange, lastGmFrequencyChange,
portOper, ptpPortEnabled, lastRcvdPortNum,
rcvdPSSync, rcvdLocalClockTick
lastPreciseOriginTimestamp,
lastFollowUpCorrectionField, lastRateRatio,
lastUpstreamTxTime, lastSyncSentTime
syncReceiptTime
MDSyncSend
To MD Entity
Notes:

a) selectedState for each port and gmPresent are set by Port State Selection state machine

(see 10.3.12)

b) currentTime is a global variable that is always equal to the current time relative to the local

oscillator
c) application interfaces to higher layers are not shown

d) the ClockMasterSyncReceive, ClockMasterSyncSend, and ClockMasterSyncOffset state

machines are optional for PTP Instances that are not grandmaster-capable.
Figure 10-2—Time-synchronization state machines—overview and interrelationships
Copyright © 2021 IEEE. All rights reserved.
---------------------- Page: 18 -----
...

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