IEEE 802.1AS-2020

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

Published By	Publication Date	Number of Pages
IEEE	2020	421

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Description

Revision Standard – Active. Protocols, procedures, and managed objects for the transport of timing over local area networks are defined in this standard. 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).

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PDF Pages	PDF Title
1	IEEE Std 802.1AS™-2020 Front cover
2	Title page
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
7	Participants
9	Introduction
10	Contents
14	List of figures
16	List of tables
18	1. Overview 1.1 Scope 1.2 Purpose
19	2. Normative references
21	3. Definitions
24	4. Acronyms and abbreviations
27	5. Conformance 5.1 Requirements terminology 5.2 Protocol Implementation Conformance Statement (PICS) 5.3 Time-aware system requirements 5.4 PTP Instance requirements and options 5.4.1 Summary of requirements
28	5.4.2 PTP Instance options
29	5.4.3 PTP Relay Instance requirements 5.5 MAC-specific timing and synchronization methods for full-duplex IEEE 802.3 links
30	5.6 MAC-specific timing and synchronization methods for IEEE Std 802.11-2016 5.7 MAC-specific timing and synchronization methods for IEEE 802.3 EPON 5.8 MAC-specific timing and synchronization methods for coordinated shared network (CSN)
31	6. Conventions 6.1 General 6.2 Service specification method and notation 6.3 Lexical form syntax 6.4 Data types and on-the-wire formats 6.4.1 General
32	6.4.2 Primitive data types specifications 6.4.3 Derived data type specifications
34	6.4.4 Protocol data unit (PDU) formats
36	7. Time-synchronization model for a packet network 7.1 General 7.2 Architecture of a time-aware network 7.2.1 General
37	7.2.2 Time-aware network consisting of a single gPTP domain
39	7.2.3 Time-aware network consisting of multiple gPTP domains
40	7.2.4 Time-aware networks with redundant Grandmaster PTP Instances and/or redundant paths
43	7.3 Time synchronization 7.3.1 General
44	7.3.2 Delay measurement 7.3.3 Logical syntonization
45	7.3.4 Grandmaster PTP Instance (best master) selection and network establishment 7.3.5 Energy efficiency
46	7.4 PTP Instance architecture
47	7.5 Differences between gPTP (IEEE Std 802.1AS) and PTP (IEEE Std 1588-2019)
49	8. IEEE 802.1AS concepts and terminology 8.1 gPTP domain 8.2 Timescale 8.2.1 Introduction
50	8.2.2 Epoch 8.2.3 UTC offset 8.2.4 Measurement of time within a gPTP domain
51	8.3 Link asymmetry
52	8.4 Messages 8.4.1 General 8.4.2 Message attributes 8.4.3 Generation of event message timestamps
53	8.4.4 Priorities
54	8.5 Ports 8.5.1 General 8.5.2 Port identity
55	8.6 PTP Instance characterization 8.6.1 PTP Instance type 8.6.2 PTP Instance attributes
60	9. Application interfaces 9.1 Overview of the interfaces
61	9.2 ClockSourceTime interface 9.2.1 General 9.2.2 ClockSourceTime.invoke function parameters 9.3 ClockTargetEventCapture interface 9.3.1 General
62	9.3.2 ClockTargetEventCapture.invoke parameters 9.3.3 ClockTargetEventCapture.result parameters 9.4 ClockTargetTriggerGenerate interface 9.4.1 General
63	9.4.2 ClockTargetTriggerGenerate.invoke parameters 9.4.3 ClockTargetTriggerGenerate.result parameters 9.4.4 ClockTargetTriggerGenerate interface definition
64	9.5 ClockTargetClockGenerator interface 9.5.1 General 9.5.2 ClockTargetClockGenerator.invoke parameters 9.5.3 ClockTargetClockGenerator.result parameters
65	9.6 ClockTargetPhaseDiscontinuity interface 9.6.1 General 9.6.2 ClockTargetPhaseDiscontinuity.result parameters
66	10. Media-independent layer specification 10.1 Overview 10.1.1 General 10.1.2 Model of operation
68	10.1.3 Grandmaster-capable PTP Instance 10.2 Time-synchronization state machines 10.2.1 Overview
70	10.2.2 Data structures communicated between state machines
76	10.2.3 Overview of global variables used by time synchronization state machines
78	10.2.4 Per PTP Instance global variables
80	10.2.5 Per-port global variables
84	10.2.6 Function used by multiple state machines 10.2.7 SiteSyncSync state machine
86	10.2.8 PortSyncSyncReceive state machine
88	10.2.9 ClockMasterSyncSend state machine
90	10.2.10 ClockMasterSyncOffset state machine
92	10.2.11 ClockMasterSyncReceive state machine
94	10.2.12 PortSyncSyncSend state machine
97	10.2.13 ClockSlaveSync state machine
99	10.3 Best master clock selection, external port configuration, and announce interval setting state machines 10.3.1 Best master clock selection and external port configuration overview
101	10.3.2 systemIdentity
102	10.3.3 stepsRemoved 10.3.4 time-synchronization spanning tree priority vectors
103	10.3.5 Priority vector calculations
104	10.3.6 PTP Port state assignments
105	10.3.7 Overview of best master clock selection, external port configuration, and announce interval setting state machines
108	10.3.8 Overview of global variables used by best master clock selection, external port configuration, and announce interval setting state machines
110	10.3.9 Per PTP Instance global variables
113	10.3.10 Per-port global variables
116	10.3.11 PortAnnounceReceive state machine
118	10.3.12 PortAnnounceInformation state machine
120	10.3.13 PortStateSelection state machine
123	10.3.14 PortAnnounceInformationExt state machine
125	10.3.15 PortStateSettingExt state machine
128	10.3.16 PortAnnounceTransmit state machine
130	10.3.17 AnnounceIntervalSetting state machine
133	10.3.18 SyncIntervalSetting state machine
136	10.4 State machines related to signaling gPTP capability 10.4.1 GptpCapableTransmit state machine
138	10.4.2 GptpCapableReceive state machine
140	10.4.3 GptpCapableIntervalSetting state machine
143	10.5 Message attributes 10.5.1 General 10.5.2 Message class 10.5.3 Addresses 10.5.4 EtherType
144	10.5.5 Subtype 10.5.6 Source port identity 10.5.7 Sequence number 10.6 Message formats 10.6.1 General
145	10.6.2 Header
149	10.6.3 Announce message
151	10.6.4 Signaling message
157	10.7 Protocol timing characterization 10.7.1 General 10.7.2 Message transmission intervals
160	10.7.3 Timeouts
161	11. Media-dependent layer specification for full-duplex point-to-point links 11.1 Overview 11.1.1 General 11.1.2 Propagation delay measurement
163	11.1.3 Transport of time-synchronization information
166	11.1.4 Model of operation
167	11.2 State machines for MD entity specific to full-duplex point-to-point links 11.2.1 General
169	11.2.2 Determination of asCapable and asCapableAcrossDomains
170	11.2.3 Use of MAC Control PAUSE operation 11.2.4 Use of priority-based flow control 11.2.5 Use of link aggregation
171	11.2.6 Service interface primitives and data structures communicated between state machines 11.2.7 DL-UNITDATA.request 11.2.8 DL-UNITDATA.indication 11.2.9 MDTimestampReceive 11.2.10 MDSyncReceive 11.2.11 MDSyncSend 11.2.12 Overview of MD entity global variables
172	11.2.13 MD entity global variables
174	11.2.14 MDSyncReceiveSM state machine
177	11.2.15 MDSyncSendSM state machine
181	11.2.16 OneStepTxOperSetting state machine
183	11.2.17 Common Mean Link Delay Service (CMLDS)
184	11.2.18 Common Mean Link Delay Service (CMLDS) global variables
185	11.2.19 MDPdelayReq state machine
190	11.2.20 MDPdelayResp state machine
193	11.2.21 LinkDelayIntervalSetting state machine
196	11.3 Message attributes 11.3.1 General 11.3.2 Message types contained in each message class
197	11.3.3 VLAN tag 11.3.4 Addresses 11.3.5 EtherType 11.3.6 Subtype 11.3.7 Source port identity
198	11.3.8 Sequence number 11.3.9 Event message timestamp point 11.4 Message formats 11.4.1 General 11.4.2 Header
201	11.4.3 Sync message
202	11.4.4 Follow_Up message
204	11.4.5 Pdelay_Req message 11.4.6 Pdelay_Resp message
205	11.4.7 Pdelay_Resp_Follow_Up message
206	11.5 Protocol timing characterization 11.5.1 General 11.5.2 Message transmission intervals
207	11.5.3 allowedLostResponses 11.5.4 allowedFaults 11.6 Control of computation of neighborRateRatio
208	11.7 Control of computation of meanLinkDelay
209	12. Media-dependent layer specification for IEEE 802.11 links 12.1 Overview 12.1.1 General 12.1.2 IEEE 802.11 Timing Measurement and Fine Timing Measurement procedures
213	12.1.3 Layering for IEEE 802.11 links 12.2 Messages
215	12.3 Determination of Timing Measurement and Fine Timing Measurement capability 12.4 Determination of asCapable
216	12.5 State machines 12.5.1 Media-dependent master state machines
223	12.5.2 Media-dependent slave state machine
228	12.6 FTM parameters
229	12.7 Format of VendorSpecific information element
230	12.8 Synchronization message interval 12.8.1 General synchronization message interval specification 12.8.2 Synchronization message interval default value
231	13. Media-dependent layer specification for interface to IEEE 802.3 Ethernet passive optical network link 13.1 Overview 13.1.1 General 13.1.2 Description of the EPON timing process 13.1.3 Best master selection
234	13.1.4 Time synchronization in EPON
235	13.2 Message attributes 13.2.1 Message class 13.3 Message format 13.3.1 TIMESYNC message
238	13.4 Determination of asCapable 13.5 Layering for IEEE 802.3 EPON links
239	13.6 Service interface definitions 13.6.1 OSSPDU.request
241	13.6.2 OSSPDU.indication 13.7 MD entity global variables
242	13.8 State machines 13.8.1 Requester state machine
243	13.8.2 Responder state machine
245	13.9 Message transmission intervals 13.9.1 General interval specification 13.9.2 TIMESYNC message transmission interval default value
246	14. Timing and synchronization management 14.1 General 14.1.1 Data set hierarchy
247	14.1.2 Data set descriptions
249	14.2 Default Parameter Data Set (defaultDS) 14.2.1 General 14.2.2 clockIdentity 14.2.3 numberPorts 14.2.4 clockQuality 14.2.5 priority1 14.2.6 priority2 14.2.7 gmCapable
250	14.2.8 currentUtcOffset 14.2.9 currentUtcOffsetValid 14.2.10 leap59 14.2.11 leap61 14.2.12 timeTraceable
251	14.2.13 frequencyTraceable 14.2.14 ptpTimescale 14.2.15 timeSource 14.2.16 domainNumber 14.2.17 sdoId 14.2.18 externalPortConfigurationEnabled 14.2.19 instanceEnable 14.2.20 defaultDS table
252	14.3 Current Parameter Data Set (currentDS) 14.3.1 General 14.3.2 stepsRemoved
253	14.3.3 offsetFromMaster 14.3.4 lastGmPhaseChange 14.3.5 lastGmFreqChange 14.3.6 gmTimebaseIndicator 14.3.7 gmChangeCount 14.3.8 timeOfLastGmChangeEvent 14.3.9 timeOfLastGmPhaseChangeEvent 14.3.10 timeOfLastGmFreqChangeEvent
254	14.3.11 currentDS table 14.4 Parent Parameter Data Set (parentDS) 14.4.1 General 14.4.2 parentPortIdentity
255	14.4.3 cumulativeRateRatio 14.4.4 grandmasterIdentity 14.4.5 grandmasterClockQuality 14.4.6 grandmasterPriority1 14.4.7 grandmasterPriority2 14.4.8 parentDS table
256	14.5 Time Properties Parameter Data Set (timePropertiesDS) 14.5.1 General 14.5.2 currentUtcOffset 14.5.3 currentUtcOffsetValid 14.5.4 leap59 14.5.5 leap61 14.5.6 timeTraceable
257	14.5.7 frequencyTraceable 14.5.8 ptpTimescale 14.5.9 timeSource 14.5.10 timePropertiesDS table 14.6 Path Trace Parameter Data Set (pathTraceDS) 14.6.1 General 14.6.2 list
258	14.6.3 enable 14.6.4 pathTraceDS table 14.7 Acceptable Master Table Parameter Data Set (acceptableMasterTableDS) 14.7.1 General 14.7.2 maxTableSize 14.7.3 actualTableSize 14.7.4 acceptableMasterArray 14.7.5 acceptableMasterTableDS table
259	14.8 Port Parameter Data Set (portDS) 14.8.1 General 14.8.2 portIdentity 14.8.3 portState
260	14.8.4 ptpPortEnabled 14.8.5 delayMechanism 14.8.6 isMeasuringDelay 14.8.7 asCapable 14.8.8 meanLinkDelay 14.8.9 meanLinkDelayThresh
261	14.8.10 delayAsymmetry 14.8.11 neighborRateRatio 14.8.12 initialLogAnnounceInterval 14.8.13 currentLogAnnounceInterval 14.8.14 useMgtSettableLogAnnounceInterval 14.8.15 mgtSettableLogAnnounceInterval 14.8.16 announceReceiptTimeout
262	14.8.17 initialLogSyncInterval 14.8.18 currentLogSyncInterval 14.8.19 useMgtSettableLogSyncInterval 14.8.20 mgtSettableLogSyncInterval 14.8.21 syncReceiptTimeout 14.8.22 syncReceiptTimeoutTimeInterval 14.8.23 initialLogPdelayReqInterval
263	14.8.24 currentLogPdelayReqInterval 14.8.25 useMgtSettableLogPdelayReqInterval 14.8.26 mgtSettableLogPdelayReqInterval 14.8.27 initialLogGptpCapableMessageInterval 14.8.28 currentLogGptpCapableMessageInterval 14.8.29 useMgtSettableLogGptpCapableMessageInterval 14.8.30 mgtSettableLogGptpCapableMessageInterval
264	14.8.31 initialComputeNeighborRateRatio 14.8.32 currentComputeNeighborRateRatio 14.8.33 useMgtSettableComputeNeighborRateRatio 14.8.34 mgtSettableComputeNeighborRateRatio 14.8.35 initialComputeMeanLinkDelay 14.8.36 currentComputeMeanLinkDelay 14.8.37 useMgtSettableComputeMeanLinkDelay
265	14.8.38 mgtSettableComputeMeanLinkDelay 14.8.39 allowedLostResponses 14.8.40 allowedFaults 14.8.41 gPtpCapableReceiptTimeout 14.8.42 versionNumber 14.8.43 nup 14.8.44 ndown 14.8.45 oneStepTxOper
266	14.8.46 oneStepReceive 14.8.47 oneStepTransmit 14.8.48 initialOneStepTxOper 14.8.49 currentOneStepTxOper 14.8.50 useMgtSettableOneStepTxOper 14.8.51 mgtSettableOneStepTxOper 14.8.52 syncLocked 14.8.53 pdelayTruncatedTimestampsArray
267	14.8.54 minorVersionNumber 14.8.55 portDS table
270	14.9 Description Port Parameter Data Set (descriptionPortDS) 14.9.1 General 14.9.2 profileIdentifier 14.9.3 descriptionPortDS table 14.10 Port Parameter Statistics Data Set (portStatisticsDS) 14.10.1 General 14.10.2 rxSyncCount 14.10.3 rxOneStepSyncCount 14.10.4 rxFollowUpCount
271	14.10.5 rxPdelayRequestCount 14.10.6 rxPdelayResponseCount 14.10.7 rxPdelayResponseFollowUpCount 14.10.8 rxAnnounceCount 14.10.9 rxPTPPacketDiscardCount 14.10.10 syncReceiptTimeoutCount
272	14.10.11 announceReceiptTimeoutCount 14.10.12 pdelayAllowedLostResponsesExceededCount 14.10.13 txSyncCount 14.10.14 txOneStepSyncCount 14.10.15 txFollowUpCount 14.10.16 txPdelayRequestCount 14.10.17 txPdelayResponseCount
273	14.10.18 txPdelayResponseFollowUpCount 14.10.19 txAnnounceCount 14.10.20 portStatisticsDS table
274	14.11 Acceptable Master Port Parameter Data Set (acceptableMasterPortDS) 14.11.1 General 14.11.2 acceptableMasterTableEnabled 14.11.3 acceptableMasterPortDS table 14.12 External Port Configuration Port Parameter Data Set (externalPortConfigurationPortDS) 14.12.1 General 14.12.2 desiredState
275	14.12.3 externalPortConfigurationPortDS table 14.13 Asymmetry Measurement Mode Parameter Data Set (asymmetryMeasurementModeDS) 14.13.1 General 14.13.2 asymmetryMeasurementMode 14.13.3 asymmetryMeasurementModeDS table
276	14.14 Common Services Port Parameter Data Set (commonServicesPortDS) 14.14.1 General 14.14.2 cmldsLinkPortPortNumber 14.14.3 commonServicesPortDS table 14.15 Common Mean Link Delay Service Default Parameter Data Set (cmldsDefaultDS) 14.15.1 General 14.15.2 clockIdentity 14.15.3 numberLinkPorts 14.15.4 cmldsDefaultDS table
277	14.16 Common Mean Link Delay Service Link Port Parameter Data Set (cmldsLinkPortDS) 14.16.1 General 14.16.2 portIdentity 14.16.3 cmldsLinkPortEnabled 14.16.4 isMeasuringDelay 14.16.5 asCapableAcrossDomains 14.16.6 meanLinkDelay
278	14.16.7 meanLinkDelayThresh 14.16.8 delayAsymmetry 14.16.9 neighborRateRatio 14.16.10 initialLogPdelayReqInterval 14.16.11 currentLogPdelayReqInterval
279	14.16.12 useMgtSettableLogPdelayReqInterval 14.16.13 mgtSettableLogPdelayReqInterval 14.16.14 initialComputeNeighborRateRatio 14.16.15 currentComputeNeighborRateRatio 14.16.16 useMgtSettableComputeNeighborRateRatio 14.16.17 mgtSettableComputeNeighborRateRatio 14.16.18 initialComputeMeanLinkDelay
280	14.16.19 currentComputeMeanLinkDelay 14.16.20 useMgtSettableComputeMeanLinkDelay 14.16.21 mgtSettableComputeMeanLinkDelay 14.16.22 allowedLostResponses 14.16.23 allowedFaults 14.16.24 versionNumber 14.16.25 pdelayTruncatedTimestampsArray 14.16.26 minorVersionNumber
281	14.16.27 cmldsLinkPortDS table
282	14.17 Common Mean Link Delay Service Link Port Parameter Statistics Data Set (cmldsLinkPortStatisticsDS) 14.17.1 General 14.17.2 rxPdelayRequestCount 14.17.3 rxPdelayResponseCount 14.17.4 rxPdelayResponseFollowUpCount 14.17.5 rxPTPPacketDiscardCount 14.17.6 pdelayAllowedLostResponsesExceededCount 14.17.7 txPdelayRequestCount
283	14.17.8 txPdelayResponseCount 14.17.9 txPdelayResponseFollowUpCount 14.17.10 cmldsLinkPortStatisticsDS table
284	14.18 Common Mean Link Delay Service Asymmetry Measurement Mode Parameter Data Set (cmldsAsymmetryMeasurementModeDS) 14.18.1 General 14.18.2 asymmetryMeasurementMode 14.18.3 cmldsAsymmetryMeasurementModeDS table
285	15. Managed object definitions 15.1 Internet Standard Management Framework 15.2 Structure of the MIB
292	15.3 Relationship to MIB in IEEE Std 802.1AS-2011 15.4 Security considerations
294	15.5 Textual conventions defined in this MIB 15.6 IEEE 802.1AS MIB module,
369	16. Media-dependent layer specification for CSN 16.1 Overview 16.2 Coordinated Shared Network characteristics
370	16.3 Layering for CSN links
371	16.4 Path delay measurement over a CSN backbone 16.4.1 General 16.4.2 Path delay measurement between CSN node and neighbor PTP Instance
372	16.4.3 Path delay measurement between CSN nodes
374	16.5 Synchronization messages 16.5.1 General
375	16.5.2 Synchronization message propagation on CSN without network reference clock 16.5.3 Synchronization message propagation on a CSN with network reference clock
378	16.6 Specific CSN requirements 16.6.1 General 16.6.2 MoCA-specific behavior
379	16.6.3 ITU-T G.hn-specific behavior 16.7 Grandmaster PTP Instance capability 16.8 CSN clock and node performance requirements
380	Annex A (normative) Protocol Implementation Conformance Statement (PICS) proforma
398	Annex B (normative) Performance requirements
406	Annex C (informative) Timescales and epochs
410	Annex D Reserved for future use
411	Annex E Reserved for future use
412	Annex F (informative) PTP profile included in this standard
415	Annex G (informative) The asymmetry compensation measurement procedure based on line-swapping
418	Annex H (informative) Bibliography
421	Back cover

Additional information

Standard Title	IEEE Standard for Local and Metropolitan Area Networks–Timing and Synchronization for Time-Sensitive Applications
Published Code	IEEE
Publication Date	2020
Pages Count	421

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