IEEE 802.1AS-2020：TSN协议族的定时与同步标准

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IEEE 802.1AS-2020标准是IEEE针对本地和城域网络（Local and Metropolitan Area Networks, LAN/MAN）提出的一项重要协议，特别关注时间敏感应用（Time-Sensitive Applications, TSN）中的精确时间和同步。这个修订版是对2011年版本的更新，由IEEE计算机协会（IEEE Computer Society）的局域网/城域网标准委员会（LAN/MAN Standards Committee）负责制定和完善。该标准的目标是在网络环境中提供高度的时间一致性，这对于工业自动化、自动驾驶、远程医疗等依赖于实时数据传输和低延迟的应用至关重要。IEEE 802.1AS定义了时间同步的具体方法，包括参考时钟的选举、时间戳的传递以及时间同步服务质量（Time Synchronization Service Quality, TSSQ）的管理，确保在多节点网络中实现毫秒级甚至更高级别的时间同步精度。 TSN协议族是IEEE 802.1系列标准的一部分，它扩展了传统以太网的功能，以支持这些高时间敏感性需求。通过增强的时间戳技术和同步机制，TSN可以满足工业4.0、物联网（IoT）和云计算环境中对数据传输准确性和实时性的严苛要求。在2020年1月30日，IEEE 802.1AS-2020得到了IEEESB（IEEE Standards Board）的批准，并授权麦马斯特大学（McMaster University）有限使用，但下载自IEEE Explore的资料可能存在使用限制。标准的版权归属于IEEE，所有权利保留，发布日期为2020年6月19日，出版地在美国。值得注意的是，文中提到的“MoCA”是“Multimedia over Coax Alliance”的缩写，是一个专注于利用有线电视电缆进行高速多媒体传输的技术标准组织，与IEEE 802.1AS-2020在技术领域有所区别，但两者可能共同服务于智能家居或网络基础设施的多元化需求。 IEEE 802.1AS-2020是现代网络通信中一个关键的基础设施组件，它通过提升时间同步性能，为依赖于实时和精确时间的应用场景提供了强有力的支持。对于任何在这些领域工作或者对TSN感兴趣的专业人士来说，理解和掌握这一标准都是至关重要的。

List of tables

Table 6-1—Primitive data types ................................................................................................................... 31

Table 8-1—Default values for priority1, for the respective media............................................................... 55

Table 8-2—TimeSource enumeration .......................................................................................................... 57

Table 10-1—Summary of scope of global variables used by time synchronization state machines 

(see 10.2.4 and 10.2.5).................................................................................................................................. 76

Table 10-2—PTP Port state definitions ........................................................................................................ 98

Table 10-3—Summary of scope of global variables used by best master clock selection, external port

configuration, and announce interval setting state machines (see 10.3.9 and 10.3.10) .............................. 107

Table 10-4—Destination address for Announce and Signaling messages ................................................. 142

Table 10-5—EtherType for Announce and Signaling messages................................................................ 142

Table 10-6—Propagate TLVs of IEEE Std 1588-2019 .............................................................................. 144

Table 10-7—PTP message header.............................................................................................................. 144

Table 10-8—Values for messageType field ............................................................................................... 145

Table 10-9—Values of flag bits.................................................................................................................. 146

Table 10-10—messageTypeSpecific semantics ......................................................................................... 147

Table 10-11—Announce message fields .................................................................................................... 148

Table 10-12—Path trace TLV .................................................................................................................... 149

Table 10-13—Signaling message fields ..................................................................................................... 150

Table 10-14—Message interval request TLV ............................................................................................ 151

Table 10-15—Interpretation of special values of logLinkDelayInterval.................................................... 152

Table 10-16—Interpretation of special values of logTimeSyncInterval .................................................... 152

Table 10-17—Interpretation of special values of logAnnounceInterval .................................................... 153

Table 10-18—Definitions of bits of flags field of message interval request TLV ..................................... 153

Table 10-19—gPTP-capable TLV.............................................................................................................. 154

Table 10-20—gPTP-capable message interval request TLV...................................................................... 155

Table 10-21—Interpretation of special values of logGptpCapableMessageInterval.................................. 156

Table 11-1—Value of meanLinkDelayThresh for various links ................................................................ 169

Table 11-2 —Summary of scope of global variables used by 

time synchronization state machines (see 10.2.4 and 10.2.5)..................................................................... 171

Table 11-3—Destination address for Sync, Follow_Up, Pdelay_Req, Pdelay_Resp, and

Pdelay_Resp_Follow_Up messages ........................................................................................................... 196

Table 11-4—EtherType for Sync, Follow_Up, Pdelay_Req, Pdelay_Resp, and 

Pdelay_Resp_Follow_Up messages ........................................................................................................... 196

Table 11-5—Values for messageType field ............................................................................................... 198

Table 11-6—Value of correctionField........................................................................................................ 199

Table 11-7—References for sequenceId value exceptions......................................................................... 199

Table 11-8—Sync message fields if twoStep flag is TRUE....................................................................... 200

Table 11-9—Sync message fields if twoStep flag is FALSE ..................................................................... 200

Table 11-10—Follow_Up message fields .................................................................................................. 201

Table 11-11—Follow_Up information TLV .............................................................................................. 202

Table 11-12—Pdelay_Req message fields ................................................................................................. 203

Table 11-13—Pdelay_Resp message fields.........................................................................................

....... 204

Table 11-14—Pdelay_Resp_Follow_Up message fields ........................................................................... 204

Table 12-1—Values of bits of tmFtmSupport ............................................................................................ 214

Table 12-2—FTM parameters relevant to time-synchronization transport ................................................ 227

Table 12-3—Values of Burst Duration and Min Delta FTM, for each value of currentLogSyncInterval . 228

Table 12-4—Values of the Type field in the VendorSpecific information element................................... 228

Table 13-1—TIMESYNC message fields .................................................................................................. 235

Table 14-1—defaultDS table ...................................................................................................................... 251

Table 14-2—currentDS table...................................................................................................................... 253

Table 14-3—parentDS table ....................................................................................................................... 255

Authorized licensed use limited to: McMaster University. Downloaded on June 21,2020 at 23:49:17 UTC from IEEE Xplore. Restrictions apply.

Table 14-4—timePropertiesDS table.......................................................................................................... 256

Table 14-5—pathTraceDS table ................................................................................................................. 257

Table 14-6—acceptableMasterTableDS table ............................................................................................ 258

Table 14-7—portState enumeration............................................................................................................ 258

Table 14-8—delayMechanism enumeration............................................................................................... 259

Table 14-9—Description of pdelayTruncatedTimestampsArray ............................................................... 266

Table 14-10—portDS table......................................................................................................................... 267

Table 14-11—descriptionPortDS table....................................................................................................... 269

Table 14-12—portStatisticsDS table .......................................................................................................... 272

Table 14-13—acceptableMasterPortDS table ............................................................................................ 273

Table 14-14—externalPortConfigurationPortDS table .............................................................................. 274

Table 14-15—asymmetryMeasurementModeDS table .............................................................................. 274

Table 14-16—commonServicesPortDS table ............................................................................................. 275

Table 14-17—cmldsDefaultDS table.......................................................................................................... 276

Table 14-18—cmldsLinkPortDS table ....................................................................................................... 280

Table 14-19—cmldsLinkPortStatisticsDS table ......................................................................................... 282

Table 14-20—cmldsAsymmetryMeasurementModeDS table.................................................................... 283

Table 15-1—IEEE8021-AS-V2 MIB structure and object cross reference................................................ 285

Table 16-1—CSN TLV .............................................................................................................................. 375

Table 16-2—Definitions and option selections per link technology .......................................................... 377

Table B-1—Wander generation TDEV requirement for LocalClock entity .............................................. 399

Table B-2—ADEV limit corresponding to wander generation requirement of Table B-1 ........................ 400

Table B-3—PTPDEV limit corresponding to wander generation requirement of Table B-1 .................... 401

Table B-4—Maximum endpoint filter bandwidths needed to meet respective MTIE masks and 

peak-to-peak jitter limits............................................................................................................................. 403

Table B-5—Breakpoints for Mask 1 .......................................................................................................... 404

Table B-6—Breakpoints for Mask 2 .......................................................................................................... 404

Table C-1—Timescale parameters ............................................................................................................. 405

Table C-2—Timescale conversions............................................................................................................ 408

Authorized licensed use limited to: McMaster University. Downloaded on June 21,2020 at 23:49:17 UTC from IEEE Xplore. Restrictions apply.

IEEE Std 802.1AS-2020

IEEE Standard for Local and Metropolitan Area Networks

Timing and Synchronization for Time-Sensitive Applications

2. Normative references

The following referenced documents are indispensable for the application of this standard (i.e., they must be

understood and used; therefore, each referenced document is cited in text, and its relationship to this

document is explained). For dated references, only the edition cited applies. For undated references, the

latest edition of the referenced document (including any amendments or corrigenda) applies.

IEEE Std 754™-2008, IEEE Standard for Floating-Point Arithmetic.

2, 3

IEEE Std 802®-2014, IEEE Standard for Local and Metropolitan Area Networks—Overview and

Architecture.

IEEE Std 802c™-2017, IEEE Standard for Local and Metropolitan Area Networks—Overview and

Architecture—Amendment 2: Local Medium Access Control (MAC) Address Usage.

IEEE Std 802.1AC™-2016, IEEE Standard for Local and metropolitan area networks—Media Access

Control (MAC) Service Definition.

IEEE Std 802.1AX™-2014, IEEE Standard for Local and metropolitan area networks—Link Aggregation.

IEEE Std 802.1Q™-2018, IEEE Standard for Local and Metropolitan Area Networks—Bridges and Bridged

Networks.

IEEE Std 802.3™-2018, IEEE Standard for Ethernet.

IEEE Std 802.11™-2016, IEEE Standard for Information technology—Telecommunications and

information exchange between systems—Local and metropolitan area networks—Specific requirements,

Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications.

IEEE Std 1588™-2019, IEEE Standard for a Precision Clock Synchronization Protocol for Networked

Measurement and Control Systems.

IERS Bulletin C (see https://www.iers.org/IERS/EN/Publications/Bulletins/bulletins.html).

IETF RFC 2863 (June 2000), The Interfaces Group MIB, K. McCloghrie and F. Kastenholz.

IETF RFC 3410 (Dec. 2002), Introduction and Applicability Statements for Internet Standard Management

Framework, J. Case, R. Mundy, D. Partain, and B. Stewart.

IETF RFC 3418 (Dec. 2002), Management Information Base (MIB) for the Simple Network Management

Protocol (SNMP), R. Presuhn, ed.

ISO 80000-3:2006, Quantities and units — Part 3: Space and time.

IEEE publications are available from The Institute of Electrical and Electronics Engineers (https://standards.ieee.org).

The IEEE standards or products referenced in this clause are trademarks owned by The Institute of Electrical and Electronics

Engineers, Incorporated.

IETF Requests for Comments (RFCs) are available from the Internet Engineering Task Force (https://www.rfc-editor.org).

ISO publications are available from the International Organization for Standardization (https://www.iso.org) and the American

National Standards Institute (https://www.ansi.org).

Authorized licensed use limited to: McMaster University. Downloaded on June 21,2020 at 23:49:17 UTC from IEEE Xplore. Restrictions apply.

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