IEEE 1588-2019

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IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems

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IEEE	2019

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Description

Revision Standard – Active. In this standard, a protocol is defined that provides precise synchronization of clocks in packet-based networked systems. Synchronization of clocks can be achieved in heterogeneous systems that include clocks of different inherent precision, resolution, and stability. The protocol supports synchronization accuracy and precision in the sub-microsecond range with minimal network and local computing resources. Customization is supported by means of profiles. The protocol includes default profiles that permit simple systems to be installed and operated without the need for user management. Sub-nanosecond time transfer accuracy can be achieved in a properly designed network.

PDF Catalog

PDF Pages	PDF Title
1	IEEE Std 1588™-2019 Front cover
2	Title page
4	Important Notices and Disclaimers Concerning IEEE Standards Documents
7	Participants
9	Introduction
10	Contents
15	1. Scope
16	2. Normative references
17	3. Definitions, acronyms, and abbreviations 3.1 Definitions
25	3.2 Acronyms and abbreviations
27	4. Conventions 4.1 Descriptive lexical form syntax 4.1.1 Lexical form syntax
28	4.2 Word usage 4.2.1 Shall 4.2.2 Must 4.2.3 Should 4.2.4 May 4.2.5 Can 4.2.6 Optional 4.2.7 Reserved
29	4.2.8 Deprecated 4.2.9 Experimental 4.3 Behavioral specification notation
31	5. Data types and on-the-wire formats 5.1 General 5.2 Primitive data type specifications
32	5.3 Derived data type specifications 5.3.1 General
33	5.3.2 TimeInterval 5.3.3 Timestamp 5.3.4 ClockIdentity 5.3.5 PortIdentity
34	5.3.6 PortAddress 5.3.7 ClockQuality 5.3.8 TLV 5.3.9 PTPText
35	5.3.10 FaultRecord 5.3.11 RelativeDifference 5.3.12 CommunicationCapabilities
36	5.4 On-the-wire formats 5.4.1 General 5.4.2 Primitive data types 5.4.3 Arrays of primitive types 5.4.4 Derived data types
37	5.4.5 Mapping of PTP protocol data units into their on-the-wire formats 6. Clock synchronization model 6.1 General requirements on implementations 6.1.1 General
38	6.1.2 Applicability and contents of the standard 6.1.3 Names for major entities defined by the standard
40	6.2 Principal assumptions about the network and implementation recommendations 6.3 PTP Networks
41	6.4 PTP message classes
42	6.5 PTP device types 6.5.1 General
43	6.5.2 Ordinary Clocks and Boundary Clocks 6.5.2.1 Layered model of Ordinary Clocks and Boundary Clocks 6.5.2.1.1 General
45	6.5.2.1.2 External environment and the Source Dependent and Sink Dependent blocks 6.5.2.1.2.1 Introducing time into a PTP Instance 6.5.2.1.2.2 Providing time to an external application 6.5.2.1.3 Common core, data sets, internal clocks, and management 6.5.2.1.3.1 PTP Common Core block
46	6.5.2.1.3.2 Clocks associated with a PTP Instance 6.5.2.1.3.3 Management 6.5.2.1.4 PTP Ports and the PTP Network
48	6.5.2.2 Properties of an Ordinary Clock
49	6.5.2.3 Properties of a Boundary Clock 6.5.3 End-to-end Transparent Clocks
51	6.5.4 Peer-to-peer Transparent Clocks
53	6.5.5 Combined Transparent Clocks and Ordinary Clocks
54	6.5.6 PTP Management Nodes 6.6 Synchronization overview 6.6.1 General 6.6.2 Establishing the master(slave hierarchy 6.6.2.1 General 6.6.2.2 PTP state machine
55	6.6.2.3 Best master clock algorithm
56	6.6.2.4 Simple master(slave hierarchy 6.6.2.5 Pruning mesh topologies
58	6.6.2.6 Segmentation of a domain by the BMCA 6.6.3 Synchronizing Ordinary Clocks and Boundary Clocks
60	6.6.4 Measuring PTP Link propagation delay using peer-to-peer delay mechanism
61	6.6.5 Generation of PTP message timestamps
62	6.6.6 Potential errors in measuring path delays and residence time 6.6.6.1 Potential errors in measuring path delays and residence time due to differing rates of the Timestamping Clocks in PTP Instances in a domain
63	6.6.6.2 Correcting for differing Timestamping Clock rates—, 6.6.6.2.1 General 6.6.6.2.2 Example using unsyntonized Local Clocks as the Timestamping Clock
65	6.6.6.2.3 Example using syntonized Local Clocks as the Timestamping Clocks
66	6.7 PTP communications overview 6.7.1 PTP communication topology 6.7.1.1 General 6.7.1.2 Hierarchical topology
67	6.7.1.3 Linear topology 6.7.1.4 Rapid reconfiguration in multiply connected topologies
69	6.7.1.5 Bridging between different network protocols 6.7.2 PTP Network startup
70	7. Characterization of PTP entities 7.1 Domains 7.1.1 General 7.1.2 Domain identification semantics when not using the isolation option of 16.5 7.1.2.1 In Boundary and Ordinary Clocks
71	7.1.2.2 In Transparent Clocks 7.1.3 Domain identification semantics when the isolation option of 16.5 is being used 7.1.3.1 In Boundary and Ordinary Clocks
72	7.1.3.2 In Transparent Clocks 7.1.4 Assigning values for the domainNumber and sdoId for a domain
73	7.2 Timescales used in PTP 7.2.1 General
74	7.2.2 Oscillator frequency 7.2.3 Epoch 7.2.4 UTC Offset
75	7.2.5 Measurement of time within a domain 7.3 PTP communications 7.3.1 Messaging model
76	7.3.2 PTP Message attributes 7.3.3 Message class 7.3.3.1 PTP event messages
77	7.3.3.2 General PTP messages 7.3.4 Generation of PTP event message timestamps 7.3.4.1 message timestamp point 7.3.4.2 Timestamp generation
80	7.3.4.3 Timestamping Clock 7.3.5 PTP message sourcePortIdentity 7.3.6 PTP message types 7.3.7 PTP message sequenceId
81	7.3.8 Flag-based Indicators 7.3.8.1 unicastFlag 7.3.8.2 alternateMasterFlag 7.3.8.3 twoStepFlag
82	7.4 PTP communication media 7.4.1 Network transport protocol 7.4.2 PTP Communication Path delay, PTP Link delay, and
84	7.4.3 Medium relative delay coefficient
85	7.5 PTP Ports 7.5.1 General
86	7.5.2 portIdentity 7.5.2.1 General
87	7.5.2.2 clockIdentity 7.5.2.2.1 General 7.5.2.2.2 Construction of clockIdentity values 7.5.2.2.2.1 General
88	7.5.2.2.2.2 Construction based on an NUI-48 7.5.2.2.2.3 Construction based on an NUI-64 7.5.2.2.3 Reserved clockIdentity value 7.5.2.3 portNumber 7.5.2.4 Ordering of clockIdentity and portIdentity values
89	7.5.2.5 Determination of PTP Port one or two-step semantics 7.5.3 Path delay measurement mechanism
90	7.5.4 PTP versions 7.6 PTP Instance characterization 7.6.1 PTP Instance type
91	7.6.2 PTP Instance attributes 7.6.2.1 General requirements 7.6.2.2 clockIdentity 7.6.2.3 priority1
92	7.6.2.4 priority2 7.6.2.5 clockClass
94	7.6.2.6 clockAccuracy
95	7.6.2.7 offsetScaledLogVariance 7.6.2.8 timeSource
96	7.6.2.9 numberPorts
97	7.6.3 PTP variance 7.6.3.1 General 7.6.3.2 Variance algorithm
98	7.6.3.3 Variance representation
99	7.6.3.4 Ordering of variances
100	7.6.3.5 Computation of defaultDS.offsetScaledLogVariance 7.6.4 Parent PTP Instance statistics 7.6.4.1 General 7.6.4.2 parentDS.parentStats 7.6.4.3 parentDS.observedParentOffsetScaledLogVariance
101	7.6.4.4 parentDS.observedParentClockPhaseChangeRate 7.6.5 defaultDS.numberPorts 7.6.6 Obtaining timing from external sources and updating the data sets of a PTP Instance 7.6.6.1 General specification
102	7.6.6.2 Source Adapter blocks 7.6.6.3 External Source block
103	7.6.7 Providing timing to external users 7.6.7.1 General specification 7.6.7.2 Sink Adapter blocks 7.6.7.3 External Sink block
104	7.7 PTP timing characterization 7.7.1 General 7.7.2 PTP message transmission intervals 7.7.2.1 General interval specification 7.7.2.2 Announce message transmission interval 7.7.2.3 Sync (multicast) message transmission interval
105	7.7.2.4 Delay_Req message transmission interval 7.7.2.5 Pdelay_Req message transmission interval 7.7.3 PTP timeouts 7.7.3.1 portDS.announceReceiptTimeout
106	8. PTP data sets 8.1 General specifications for data set members 8.1.1 Introduction to data sets 8.1.1.1 Introduction to data set specifications 8.1.1.2 Ordinary Clocks and Boundary Clocks 8.1.1.3 Transparent Clocks
107	8.1.2 Initialization classification 8.1.2.1 General 8.1.2.1.1 Static members 8.1.2.1.2 Dynamic members 8.1.2.1.3 Configurable members
108	8.1.3 PTP Instance data set initialization properties 8.1.3.1 General initialization specifications 8.1.3.2 Initialization of static data set members 8.1.3.3 Initialization of dynamic data set members 8.1.3.4 Initialization of configurable data set members
109	8.1.3.5 Operation of nonvolatile read(write storage of data set members 8.1.4 Use of data sets for management 8.1.4.1 General
110	8.1.4.2 Organization within a PTP Node
111	8.1.4.3 Management conformance
112	8.1.4.4 Read/write permissions 8.1.5 Data type
113	8.1.6 Operational conformance 8.1.7 Correspondence between abstract quantities and data set members
114	8.2 Data sets for PTP Instances 8.2.1 defaultDS data set member specifications 8.2.1.1 General 8.2.1.2 Static members of the defaultDS data set 8.2.1.2.1 defaultDS.twoStepFlag (deprecated)
115	8.2.1.2.2 defaultDS.clockIdentity 8.2.1.2.3 defaultDS.numberPorts 8.2.1.3 Dynamic members of the defaultDS data set 8.2.1.3.1 defaultDS.clockQuality 8.2.1.3.1.1 General 8.2.1.3.1.2 defaultDS.clockQuality.clockClass
116	8.2.1.3.1.3 defaultDS.clockQuality.clockAccuracy 8.2.1.3.1.4 defaultDS.clockQuality.offsetScaledLogVariance 8.2.1.4 Configurable members of the defaultDS data set 8.2.1.4.1 defaultDS.priority1 8.2.1.4.2 defaultDS.priority2 8.2.1.4.3 defaultDS.domainNumber 8.2.1.4.4 defaultDS.slaveOnly
117	8.2.1.4.5 defaultDS.sdoId 8.2.1.5 Optional members of the defaultDS data set 8.2.1.5.1 defaultDS.currentTime 8.2.1.5.2 defaultDS.instanceEnable
118	8.2.1.5.3 defaultDS.externalPortConfigurationEnabled 8.2.1.5.4 defaultDS.maxStepsRemoved 8.2.1.5.5 defaultDS.instanceType
119	8.2.2 currentDS data set member specifications 8.2.2.1 General 8.2.2.2 currentDS.stepsRemoved 8.2.2.3 currentDS.offsetFromMaster 8.2.2.4 currentDS.meanDelay
120	8.2.2.5 currentDS.synchronizationUncertain
121	8.2.3 parentDS data set member specifications 8.2.3.1 General 8.2.3.2 parentDS.parentPortIdentity 8.2.3.3 parentDS.parentStats
122	8.2.3.4 parentDS.observedParentOffsetScaledLogVariance 8.2.3.5 parentDS.observedParentClockPhaseChangeRate 8.2.3.6 parentDS.grandmasterIdentity 8.2.3.7 parentDS.grandmasterClockQuality 8.2.3.8 parentDS.grandmasterPriority1
123	8.2.3.9 parentDS.grandmasterPriority2 8.2.3.10 parentDS.protocolAddress 8.2.3.11 parentDS.synchronizationUncertain 8.2.4 timePropertiesDS data set member specifications 8.2.4.1 General
124	8.2.4.2 timePropertiesDS.currentUtcOffset
125	8.2.4.3 timePropertiesDS.currentUtcOffsetValid 8.2.4.4 timePropertiesDS.leap59 8.2.4.5 timePropertiesDS.leap61 8.2.4.6 timePropertiesDS.timeTraceable
126	8.2.4.7 timePropertiesDS.frequencyTraceable 8.2.4.8 timePropertiesDS.ptpTimescale 8.2.4.9 timePropertiesDS.timeSource 8.2.5 descriptionDS 8.2.5.1 General
127	8.2.5.2 descriptionDS.manufacturerIdentity 8.2.5.3 descriptionDS.productDescription
128	8.2.5.4 descriptionDS.productRevision 8.2.5.5 descriptionDS.userDescription 8.2.6 faultLogDS 8.2.6.1 General 8.2.6.2 faultLogDS.numberOfFaultRecords
129	8.2.6.3 faultLogDS.faultRecordList 8.2.6.4 faultLogDS.reset
130	8.2.7 nonvolatileStorageDS 8.2.7.1 General 8.2.7.2 nonVolatileStorageDS.reset 8.2.7.3 nonVolatileStorageDS.save
131	8.2.8 pathTraceDS 8.2.9 alternateTimescaleOffsetsDS 8.2.10 holdoverUpgradeDS 8.2.10.1 General 8.2.11 grandmasterClusterDS 8.2.12 acceptableMasterTableDS 8.2.13 performanceMonitoringDS 8.2.14 enhancedSynchronizationAccuracyMetricsDS 8.2.14.1 General
132	8.2.14.2 enhancedSynchronizationAccuracyMetricsDS.enable 8.2.15 portDS data set member specifications 8.2.15.1 General
133	8.2.15.2 Static members of the portDS data set 8.2.15.2.1 portDS.portIdentity 8.2.15.3 Dynamic members of the portDS data set 8.2.15.3.1 portDS.portState 8.2.15.3.2 portDS.logMinDelayReqInterval 8.2.15.3.3 portDS.meanLinkDelay
134	8.2.15.4 Configurable members of the portDS data set 8.2.15.4.1 portDS.logAnnounceInterval 8.2.15.4.2 portDS.announceReceiptTimeout 8.2.15.4.3 portDS.logSyncInterval 8.2.15.4.4 portDS.delayMechanism
135	8.2.15.4.5 portDS.logMinPdelayReqInterval 8.2.15.4.6 portDS.versionNumber 8.2.15.4.7 portDS.minorVersionNumber 8.2.15.4.8 portDS.delayAsymmetry 8.2.15.5 Optional members of the portDS data set 8.2.15.5.1 portDS.portEnable
136	8.2.15.5.2 portDS.masterOnly 8.2.16 timestampCorrectionPortDS 8.2.16.1 General 8.2.16.2 timestampCorrectionPortDS.egressLatency 8.2.16.3 timestampCorrectionPortDS.ingressLatency
137	8.2.17 asymmetryCorrectionPortDS 8.2.17.1 General 8.2.17.2 asymmetryCorrectionPortDS.constantAsymmetry
138	8.2.17.3 asymmetryCorrectionPortDS.scaledDelayCoefficient 8.2.17.4 asymmetryCorrectionPortDS.enable 8.2.18 descriptionPortDS 8.2.18.1 General 8.2.18.2 descriptionPortDS.profileIdentifier
139	8.2.18.3 descriptionPortDS.protocolAddress 8.2.19 unicastNegotiationPortDS 8.2.19.1 General 8.2.19.2 unicastNegotiationPortDS.enable
140	8.2.20 alternateMasterPortDS 8.2.21 unicastDiscoveryPortDS 8.2.22 acceptableMasterPortDS 8.2.23 L1SyncBasicPortDS
141	8.2.24 L1SyncOptParamsPortDS 8.2.25 communicationCapabilitiesPortDS 8.2.25.1 communicationCapabilitiesPortDS.syncCapabilities 8.2.25.2 communicationCapabilitiesPortDS.delayRespCapabilities
142	8.2.26 performanceMonitoringPortDS 8.2.27 commonServicesPortDS 8.2.28 externalPortConfigurationPortDS 8.2.29 slaveMonitoringPortDs 8.3 Data sets for Transparent Clocks 8.3.1 General 8.3.1.1 Node-level data sets for Transparent Clocks 8.3.1.2 Instance-level data sets for Transparent Clocks
143	8.3.2 transparentClockDefaultDS data set member specifications (deprecated) 8.3.2.1 General 8.3.2.2 Static members of the transparentClockDefaultDS data set 8.3.2.2.1 transparentClockDefaultDS.clockIdentity 8.3.2.2.2 transparentClockDefaultDS.numberPorts 8.3.2.3 Configurable members of the transparentClockDefaultDS data set 8.3.2.3.1 transparentClockDefaultDS.delayMechanism
144	8.3.2.3.2 transparentClockDefaultDS.primaryDomain 8.3.3 transparentClockPortDS data set member specifications (deprecated) 8.3.3.1 General 8.3.3.2 Static members of the portDS data set 8.3.3.2.1 transparentClockPortDS.portIdentity 8.3.3.3 Dynamic members of the portDS data set 8.3.3.3.1 transparentClockPortDS.logMinPdelayReqInterval 8.3.3.3.2 transparentClockPortDS.faultyFlag
145	8.3.3.3.3 transparentClockPortDS.peerMeanPathDelay 8.4 commonMeanLinkDelayService data sets 9. PTP for Ordinary Clocks and Boundary Clocks 9.1 General protocol requirements for PTP Ordinary Clocks and Boundary Clocks
146	9.2 State protocol 9.2.1 General state requirements 9.2.2 PTP Instances with special state behavior 9.2.2.1 Slave-Only Ordinary Clocks 9.2.2.2 MasterOnly PTP Ports
147	9.2.2.3 PTP Ports not on a Slave-Only Ordinary Clock or in a masterOnly mode 9.2.3 Non-slaveOnly PTP Instances 9.2.4 State definitions 9.2.5 State machines
151	9.2.6 Events initiating PTP state transitions 9.2.6.1 General 9.2.6.2 POWERUP 9.2.6.3 INITIALIZE 9.2.6.4 DESIGNATED_ENABLED 9.2.6.5 DESIGNATED_DISABLED 9.2.6.6 FAULT_CLEARED 9.2.6.7 FAULT_DETECTED 9.2.6.8 INITIALIZATION_COMPLETE
152	9.2.6.9 STATE_DECISION_EVENT
153	9.2.6.10 Recommended state 9.2.6.11 QUALIFICATION_TIMEOUT_EXPIRES 9.2.6.12 ANNOUNCE_RECEIPT_TIMEOUT_EXPIRES
154	9.2.6.13 SYNCHRONIZATION_FAULT 9.2.6.14 MASTER_CLOCK_SELECTED 9.2.7 Applying PTP events to the PTP Ports of a Boundary Clock
155	9.3 Best master clock algorithms 9.3.1 Selection of the best master clock algorithm
156	9.3.2 Best master clock algorithm 9.3.2.1 Overview and definition of terms 9.3.2.2 General best master clock algorithm specifications 9.3.2.3 Computation of Erbest
157	9.3.2.4 specifications 9.3.2.4.1 General 9.3.2.4.2 [].foreignMasterPortIdentity 9.3.2.4.3 [].foreignMasterAnnounceMessages 9.3.2.4.4 [].mostRecentAnnounceMessage
158	9.3.2.4.5 FOREIGN_MASTER_TIME_WINDOW and FOREIGN_MASTER_THRESHOLD 9.3.2.4.6 Size of 9.3.2.5 Qualification of Announce messages
159	9.3.3 State decision algorithm
160	9.3.4 Data set comparison algorithm
164	9.3.5 Update of data sets
165	9.4 Grandmaster PTP Instance timePropertiesDS updates
167	9.5 PTP message processing semantics 9.5.1 Messaging behavior of Ordinary Clock and Boundary Clocks 9.5.2 Receipt by a PTP Instance of any message from itself 9.5.2.1 General
168	9.5.2.2 Ordinary Clocks and any single PTP Port of a Boundary Clock 9.5.2.3 Additional constraints for Boundary Clocks 9.5.3 Receipt of an Announce message from another PTP Instance
171	9.5.4 Receipt of a Sync message from another PTP Instance
172	9.5.5 Receipt of a Follow_Up message from another PTP Instance
173	9.5.6 Receipt of a Delay_Req message from another PTP Instance
175	9.5.7 Receipt of a Delay_Resp message from another PTP Instance
177	9.5.8 Transmission of an Announce message 9.5.9 Transmission of a Sync message 9.5.9.1 General specification
178	9.5.9.2 General requirements 9.5.9.3 Additional requirements when the Message Length Extension option is active 9.5.9.4 One-step PTP Ports
179	9.5.9.5 Two-step PTP Ports 9.5.10 Transmission of a Follow_Up message 9.5.11 Transmission of a Delay_Req message 9.5.11.1 General requirements
180	9.5.11.2 Timing requirements
181	9.5.12 Transmission of a Delay_Resp message
182	9.5.13 Transmission of a Pdelay_Req message 9.5.13.1 General requirements 9.5.13.2 Timing requirements 9.5.14 Transmission of Pdelay_Resp message 9.5.15 Transmission of Pdelay_Resp_Follow_Up message
183	9.6 Changes in the PTP Instance 10. PTP for Transparent Clocks 10.1 Requirements for both end-to-end and peer-to-peer Transparent Clocks 10.1.1 Residence time computations 10.1.2 Retransmission of PTP messages that contain TLVs 10.2 End-to-end Transparent Clock requirements 10.2.1 General requirements
184	10.2.2 Default PTP message processing in end-to-end Transparent Clocks
185	10.2.2.1 Processing of Sync messages 10.2.2.1.1 Egress one-step PTP Ports 10.2.2.1.2 Egress two-step PTP Ports 10.2.2.1.2.1 Ingress Sync message twoStep flag is FALSE 10.2.2.1.2.2 Ingress Sync message twoStep flag is TRUE
186	10.2.2.2 Processing of Delay_Req messages 10.2.2.2.1 General specification 10.2.2.2.2 Egress one-step PTP Ports 10.2.2.2.3 Egress two-step PTP Ports
187	10.2.2.3 Processing of Pdelay_Req and Pdelay_Resp messages 10.2.2.3.1 General 10.2.2.3.2 Egress one-step PTP Ports on end-to-end Transparent Clocks 10.2.2.3.3 Egress two-step PTP Ports on end-to-end Transparent Clocks
188	10.2.3 Alternate processing of Sync, Delay_Req, Delay_Resp, Pdelay_Req, and Pdelay_Resp messages on end-to-end Transparent Clocks 10.2.3.1 General requirements
189	10.2.3.2 Constraints on processing of Sync and Follow_Up messages
190	10.2.3.2.1 All cases 10.2.3.2.2 Ingress and egress twoStepFlags both FALSE 10.2.3.2.3 Ingress twoStepFlag FALSE and egress twoStepFlag TRUE 10.2.3.2.4 Ingress twoStepFlag TRUE and egress twoStepFlag FALSE 10.2.3.2.5 Ingress twoStepFlag TRUE and egress twoStepFlag TRUE: 10.2.3.3 Constraints on processing of Delay_Req and Delay_Resp messages
191	10.2.3.4 Constraints on processing of Pdelay_Req and Pdelay_Resp messages 10.2.3.4.1 All cases 10.2.3.4.2 Ingress twoStep flag is FALSE 10.2.3.4.3 Ingress twoStep flag is TRUE
192	10.3 Peer-to-peer Transparent Clock requirements 10.3.1 General requirements 10.3.2 Default Sync and Follow_Up message processing in peer-to-peer Transparent Clocks 10.3.2.1 Egress one-step PTP Ports
193	10.3.2.2 Egress two-step PTP Ports 10.3.2.2.1 Ingress Sync message twoStep flag is FALSE 10.3.2.2.2 Ingress Sync message twoStep flag is TRUE
194	10.3.3 Alternate processing of Sync and Follow_Up messages on peer-to-peer Transparent Clocks 10.3.3.1 General requirements
195	10.3.3.2 Constraints on processing of Sync and Follow_Up messages 10.3.3.2.1 All cases 10.3.3.2.2 Ingress and egress twoStepFlags both FALSE 10.3.3.2.3 Ingress twoStepFlag FALSE and egress twoStepFlag TRUE
196	10.3.3.2.4 Ingress twoStepFlag TRUE and egress twoStepFlag FALSE 10.3.3.2.5 Ingress twoStepFlag TRUE and egress twoStepFlag TRUE 11. Clock offset, path delay, residence time, and asymmetry corrections 11.1 General specifications
197	11.2 Computation of in Ordinary Clocks and Boundary Clocks
198	11.3 Delay request-response mechanism for Ordinary Clocks and Boundary Clocks 11.3.1 Delay request-response mechanism general requirements
199	11.3.2 Delay request-response mechanism operational specifications
200	11.4 Peer-to-peer delay mechanism 11.4.1 Peer-to-peer delay mechanism general requirements
201	11.4.2 Peer-to-peer delay mechanism operational specifications
203	11.4.3 Restriction on the use of the peer-to-peer delay mechanism
205	11.5 MDMI interface and Special Ports 11.5.1 General requirements
206	11.5.2 Operation of the components in a Special Port 11.5.2.1 Nontiming PTP message handling by a Special Port 11.5.2.1.1 Announce messages 11.5.2.1.2 Signaling messages 11.5.2.1.3 PTP management messages
207	11.5.2.2 Time transfer by a Special Port 11.5.2.2.1 PTP Port block 11.5.2.2.2 MDMI interface general properties 11.5.2.2.3 Special PTP MD Adapter block
208	11.5.2.2.4 Network Interface Stack 11.5.3 Timing information transfer across the MDMI Interface
209	11.5.3.1 Timing information transfer across the MDMI Interface on reception
210	11.5.3.1.1 domainNumber 11.5.3.1.2 sdoId 11.5.3.1.3 sourcePortIdentity 11.5.3.1.4 originOrPreciseOriginTimestamp 11.5.3.1.5 correctionField
211	11.5.3.1.6 logMessageInterval 11.5.3.1.7 upstreamTxTime 11.5.3.1.8 cumulativeRateRatio 11.5.3.2 Timing information transfer across the MDMI Interface on transmission
212	11.5.3.2.1 domainNumber 11.5.3.2.2 sdoId 11.5.3.2.3 sourcePortIdentity 11.5.3.2.4 originOrPreciseOriginTimestamp
213	11.5.3.2.5 correctionField 11.5.3.2.6 logMessageInterval
214	11.5.3.2.7 upstreamTxTime 11.5.3.2.8 cumulativeRateRatio 11.5.3.3 Computation of at the PTP Instance whose PTP Port in the SLAVE state is a Special Port
215	12. Synchronization and syntonization of clocks 12.1 Clock adjustments 12.2 Syntonization 12.2.1 General specification 12.2.2 Syntonization based on Sync messages
216	12.2.3 Syntonization based on other mechanisms 12.3 Synchronization
217	13. PTP message formats 13.1 General 13.2 General PTP message format requirements 13.3 Header 13.3.1 General header specifications
218	13.3.2 Header specifications 13.3.2.1 majorSdoId (Nibble) 13.3.2.2 minorSdoId (UInteger8) 13.3.2.3 messageType (Enumeration4)
219	13.3.2.4 versionPTP (UInteger4) 13.3.2.5 minorVersionPTP (UInteger4) 13.3.2.6 messageLength (UInteger16) 13.3.2.7 domainNumber (UInteger8) 13.3.2.8 flagField (Octet[2])
220	13.3.2.9 correctionField (Integer64)
221	13.3.2.10 messageTypeSpecific (Octet[4]) 13.3.2.11 sourcePortIdentity (PortIdentity)
222	13.3.2.12 sequenceId (UInteger16) 13.3.2.13 controlField (UInteger8) 13.3.2.14 logMessageInterval (Integer8)
223	13.4 Suffix 13.5 Announce message 13.5.1 General Announce message specifications
224	13.5.2 Announce message field specifications 13.5.2.1 originTimestamp (Timestamp) 13.5.2.2 currentUtcOffset (Integer16) 13.5.2.3 grandmasterPriority1 (UInteger8) 13.5.2.4 grandmasterClockQuality (ClockQuality) 13.5.2.5 grandmasterPriority2 (UInteger8) 13.5.2.6 grandmasterIdentity (ClockIdentity) 13.5.2.7 stepsRemoved (UInteger16)
225	13.5.2.8 timeSource (Enumeration8) 13.6 Sync and Delay_Req messages 13.6.1 General Sync and Delay_Req message specifications 13.6.2 Sync and Delay_Req message field specifications 13.6.2.1 originTimestamp (Timestamp) 13.7 Follow_Up message 13.7.1 General Follow_Up message specifications 13.7.2 Follow_Up message field specifications 13.7.2.1 preciseOriginTimestamp (Timestamp)
226	13.8 Delay_Resp message 13.8.1 General Delay_Resp message specifications 13.8.2 Delay_Resp message field specifications 13.8.2.1 receiveTimestamp (Timestamp) 13.8.2.2 requestingPortIdentity (PortIdentity) 13.9 Pdelay_Req message 13.9.1 General Pdelay_Req message specifications
227	13.9.2 Pdelay_Req message field specifications 13.9.2.1 originTimestamp (Timestamp) 13.10 Pdelay_Resp message 13.10.1 General Pdelay_Resp message specifications 13.10.2 Pdelay_Resp message field specifications 13.10.2.1 requestReceiptTimestamp (Timestamp) 13.10.2.2 requestingPortIdentity (PortIdentity) 13.11 Pdelay_Resp_Follow_Up message 13.11.1 General Pdelay_Resp_Follow_Up message specifications
228	13.11.2 Pdelay_Resp_Follow_Up message field specifications 13.11.2.1 responseOriginTimestamp (Timestamp) 13.11.2.2 requestingPortIdentity (PortIdentity) 13.12 Signaling message 13.12.1 Receipt of a Signaling message from another PTP Instance 13.12.2 Transmission of a Signaling message
229	13.12.2.1 targetPortIdentity (PortIdentity) 13.13 PTP management message 14. TLV entity specifications 14.1 General requirements 14.1.1 tlvType (Enumeration16)
230	14.1.2 lengthField (UInteger16)
231	14.1.3 valueField (tlvType specific) 14.2 Propagation of TLVs through Boundary Clocks 14.2.1 TLVs Attached to non-Announce PTP Messages 14.2.2 Unsupported TLVs Attached to Announce PTP Message 14.2.2.1 Unsupported TLVs marked “Do Not Propagate” 14.2.2.2 Unsupported TLVs marked “Propagate”
232	14.2.2.3 Supported TLVs received on an Announce message 14.3 Vendor and standard organization extension TLVs 14.3.1 General 14.3.2 TLV member specifications
233	14.3.2.1 tlvType (Enumeration16) 14.3.2.2 lengthField (UInteger16) 14.3.2.3 organizationId (Octet[3]) 14.3.2.4 organizationSubType (Enumeration24)
234	14.3.2.5 data (organizationSubType and organizationId specific) 14.4 PAD TLV (optional) 14.4.1 General 14.4.2 PAD TLV specification 14.4.2.1 tlvType 14.4.2.2 lengthField 14.4.2.3 pad
235	15. PTP management messages (optional) 15.1 General 15.1.1 Selection of management mechanisms 15.2 PTP management mechanism 15.3 Processing of PTP management messages 15.3.1 Receipt of a PTP management message
236	15.3.2 Transmission of a PTP management message 15.3.3 Boundary Clock retransmission of PTP management messages 15.4 PTP management message format 15.4.1 Common fields
237	15.4.1.1 domainNumber, majorSdoId, and minorSdoId of the header 15.4.1.2 sequenceId of the header 15.4.1.3 targetPortIdentity (PortIdentity) 15.4.1.4 startingBoundaryHops (UInteger8) 15.4.1.5 boundaryHops (UInteger8)
238	15.4.1.7 managementTLV
239	15.5 Management TLVs 15.5.1 Management TLV introduction 15.5.1.1 General 15.5.1.1.1 Management of data sets 15.5.1.1.2 Management of events 15.5.2 MANAGEMENT TLV field format 15.5.2.1 tlvType (Enumeration16) 15.5.2.2 lengthField (UInteger16)
240	15.5.2.3 managementId (Enumeration16)
242	15.5.3 Management TLV data field specifications for each managementId 15.5.3.1 TLV data fields for MANAGEMENT_TLVs applicable to all PTP Instances 15.5.3.1.1 NULL_PTP_MANAGEMENT 15.5.3.1.2 CLOCK_DESCRIPTION
243	15.5.3.1.2.1 clockType (Boolean[16])
244	15.5.3.1.2.2 physicalLayerProtocol (PTPText) 15.5.3.1.2.3 physicalAddressLength (UInteger16) 15.5.3.1.2.4 physicalAddress (Octet[physicalAddressLength]) 15.5.3.1.2.5 protocolAddress (PortAddress) 15.5.3.1.2.6 manufacturerIdentity (Octet[3]) 15.5.3.1.2.7 productDescription (PTPText ) 15.5.3.1.2.8 revisionData (PTPText )
245	15.5.3.1.2.9 userDescription (PTPText ) 15.5.3.1.2.10 profileIdentifier (Octet[6]) 15.5.3.1.2.11 pad (Octet[M]) 15.5.3.1.3 USER_DESCRIPTION 15.5.3.1.3.1 userDescription (PTPText ) 15.5.3.1.3.2 pad (Octet[M]) 15.5.3.1.4 SAVE_IN_NON_VOLATILE_STORAGE
246	15.5.3.1.5 RESET_NON_VOLATILE_STORAGE 15.5.3.1.6 INITIALIZE 15.5.3.1.6.1 initializationKey (Enumeration16) 15.5.3.1.7 FAULT_LOG 15.5.3.1.7.1 numberOfFaultRecords (UInteger16)
247	15.5.3.1.7.2 faultRecordList (FaultRecord[numberOfFaultRecords]) 15.5.3.1.7.3 pad (Octet[M]) 15.5.3.1.8 FAULT_LOG_RESET 15.5.3.2 TLV data fields applicable to Ordinary Clocks and Boundary Clocks 15.5.3.2.1 TIME 15.5.3.2.1.1 currentTime (Timestamp) 15.5.3.2.2 CLOCK_ACCURACY
248	15.5.3.2.2.1 clockAccuracy (Enumeration8) 15.5.3.2.3 ENABLE_PORT 15.5.3.2.4 DISABLE_PORT 15.5.3.2.5 SLAVE_EVENT_MONITORING management TLV data field
249	15.5.3.2.5.1 TLV0 (Boolean) 15.5.3.2.5.2 TLV1 (Boolean) 15.5.3.2.5.3 TLV2 (Boolean) 15.5.3.2.5.4 EPRSTT (UInteger8) 15.5.3.2.5.5 EPRSCT (UInteger8) 15.5.3.2.5.6 EPTETT (UInteger8)
250	15.5.3.2.5.7 TET (UInteger8) 15.5.3.3 TLV data fields applicable to the defaultDS data set of Ordinary Clocks and Boundary Clocks 15.5.3.3.1 DEFAULT_DATA_SET 15.5.3.3.1.1 TSC (Boolean) 15.5.3.3.1.2 SO (Boolean) 15.5.3.3.1.3 numberPorts (UInteger16) 15.5.3.3.1.4 priority1 (UInteger8) 15.5.3.3.1.5 clockQuality (ClockQuality)
251	15.5.3.3.1.6 priority2 (UInteger8) 15.5.3.3.1.7 clockIdentity (ClockIdentity) 15.5.3.3.1.8 domainNumber (UInteger8) 15.5.3.3.2 PRIORITY1 15.5.3.3.2.1 priority1 (UInteger8) 15.5.3.3.3 PRIORITY2 15.5.3.3.3.1 priority2 (UInteger8) 15.5.3.3.4 DOMAIN
252	15.5.3.3.4.1 domainNumber (UInteger8) 15.5.3.3.5 SLAVE_ONLY 15.5.3.3.5.1 SO (Boolean) 15.5.3.3.6 PATH_TRACE_LIST PTP management message 15.5.3.3.6.1 pathSequence (ClockIdentity[N]) 15.5.3.3.7 PATH_TRACE_ENABLE PTP management message
253	15.5.3.3.7.1 EN (Boolean) 15.5.3.3.8 ALTERNATE_TIME_OFFSET_ENABLE PTP management message 15.5.3.3.8.1 keyField (UInteger8) 15.5.3.3.8.2 EN (Boolean) 15.5.3.3.9 ALTERNATE_TIME_OFFSET_NAME TLV
254	15.5.3.3.9.1 keyField (UInteger8) 15.5.3.3.9.2 displayName (PTPText) 15.5.3.3.9.3 pad (Octet[M]) 15.5.3.3.10 ALTERNATE_TIME_OFFSET_MAX_KEY management TLV 15.5.3.3.10.1 maxKey (UInteger8) 15.5.3.3.11 ALTERNATE_TIME_OFFSET_PROPERTIES management TLV (optional)
255	15.5.3.3.11.1 keyField (UInteger8) 15.5.3.3.11.2 currentOffset (Integer32) 15.5.3.3.11.3 jumpSeconds (Integer32) 15.5.3.3.11.4 timeOfNextJump (UInteger48) 15.5.3.3.12 Configuration of holdoverUpgradeDS
256	15.5.3.3.12.1 EN (Boolean) 15.5.3.3.13 GRANDMASTER_CLUSTER_TABLE management TLV data field 15.5.3.3.13.1 logQueryInterval (Integer8) 15.5.3.3.13.2 actualTableSize (UInteger8)
257	15.5.3.3.13.3 portAddress (PortAddress[actualTableSize]) 15.5.3.3.13.4 pad (Octet[M]) 15.5.3.3.14 ACCEPTABLE_MASTER_TABLE management TLV data field 15.5.3.3.14.1 actualTableSize (Integer16) 15.5.3.3.14.2 list(acceptableMaster[actualTableSize])
258	15.5.3.3.14.3 pad (Octet[M]) 15.5.3.3.15 ACCEPTABLE_MASTER_MAX_TABLE_SIZE management TLV data field 15.5.3.3.15.1 maxTableSize (UInteger16) 15.5.3.4 TLV data fields applicable to the currentDS data set of Ordinary Clocks and Boundary Clocks 15.5.3.4.1 CURRENT_DATA_SET
259	15.5.3.4.1.1 stepsRemoved (UInteger16) 15.5.3.4.1.2 offsetFromMaster (TimeInterval) 15.5.3.4.1.3 meanPathDelay (TimeInterval) 15.5.3.5 TLV data fields applicable to the parentDS data set of Ordinary Clocks and Boundary Clocks 15.5.3.5.1 PARENT_DATA_SET 15.5.3.5.1.1 parentPortIdentity (PortIdentity) 15.5.3.5.1.2 PS (Boolean)
260	15.5.3.5.1.3 observedParentOffsetScaledLogVariance (UInteger16) 15.5.3.5.1.4 observedParentClockPhaseChangeRate (Integer32) 15.5.3.5.1.5 grandmasterPriority1 (UInteger8) 15.5.3.5.1.6 grandmasterClockQuality (ClockQuality) 15.5.3.5.1.7 grandmasterPriority2 (UInteger8) 15.5.3.5.1.8 grandmasterIdentity (ClockIdentity) 15.5.3.6 TLV data fields applicable to the timePropertiesDS data set of Ordinary Clocks and Boundary Clocks 15.5.3.6.1 TIME_PROPERTIES_DATA_SET 15.5.3.6.1.1 currentUtcOffset (Integer16)
261	15.5.3.6.1.2 LI-61 (Boolean) 15.5.3.6.1.3 LI-59 (Boolean) 15.5.3.6.1.4 UTCV (Boolean) 15.5.3.6.1.5 PTP (Boolean) 15.5.3.6.1.6 TTRA (Boolean) 15.5.3.6.1.7 FTRA (Boolean) 15.5.3.6.1.8 timeSource (Enumeration8) 15.5.3.6.2 UTC_PROPERTIES 15.5.3.6.2.1 currentUtcOffset (Integer16)
262	15.5.3.6.2.2 LI-61 (Boolean) 15.5.3.6.2.3 LI-59 (Boolean) 15.5.3.6.2.4 UTCV (Boolean) 15.5.3.6.3 TRACEABILITY_PROPERTIES 15.5.3.6.3.1 TTRA (Boolean) 15.5.3.6.3.2 FTRA (Boolean) 15.5.3.6.4 TIMESCALE_PROPERTIES 15.5.3.6.4.1 PTP (Boolean)
263	15.5.3.6.4.2 timeSource (Enumeration8) 15.5.3.7 TLV data fields applicable to the portDS data set of Ordinary Clocks and Boundary Clocks 15.5.3.7.1 PORT_DATA_SET 15.5.3.7.1.1 portIdentity (PortIdentity) 15.5.3.7.1.2 portState (Enumeration8) 15.5.3.7.1.3 logMinDelayReqInterval (Integer8) 15.5.3.7.1.4 meanLinkDelay (TimeInterval) 15.5.3.7.1.5 logAnnounceInterval (Integer8)
264	15.5.3.7.1.6 announceReceiptTimeout (UInteger8) 15.5.3.7.1.7 logSyncInterval (Integer8) 15.5.3.7.1.8 delayMechanism (Enumeration8) 15.5.3.7.1.9 logMinPdelayReqInterval (Integer8) 15.5.3.7.1.10 versionNumber (UInteger4) 15.5.3.7.2 LOG_ANNOUNCE_INTERVAL 15.5.3.7.2.1 logAnnounceInterval (Integer8) 15.5.3.7.3 ANNOUNCE_RECEIPT_TIMEOUT
265	15.5.3.7.3.1 announceReceiptTimeout (UInteger8) 15.5.3.7.4 LOG_SYNC_INTERVAL 15.5.3.7.4.1 logSyncInterval (Integer8) 15.5.3.7.5 DELAY_MECHANISM 15.5.3.7.5.1 delayMechanism (Enumeration8) 15.5.3.7.6 LOG_MIN_PDELAY_REQ_INTERVAL
266	15.5.3.7.6.1 logMinPdelayReqInterval (Integer8) 15.5.3.7.7 VERSION_NUMBER 15.5.3.7.7.1 versionNumber (UInteger4) 15.5.3.7.8 EXTERNAL_PORT_CONFIGURATION_ENABLED 15.5.3.7.8.1 EPC 15.5.3.7.9 MASTER_ONLY
267	15.5.3.7.9.1 MO (Boolean) 15.5.3.7.10 UNICAST_NEGOTIATION_ENABLE 15.5.3.7.10.1 EN (Boolean) 15.5.3.7.11 ALTERNATE_MASTER management TLV data field 15.5.3.7.11.1 S (Boolean)
268	15.5.3.7.11.2 logAlternateMulticastSyncInterval (Integer8) 15.5.3.7.11.3 numberOfAlternateMasters (UInteger8) 15.5.3.7.12 UNICAST_MASTER_TABLE management TLV data field 15.5.3.7.12.1 logQueryInterval (Integer8) 15.5.3.7.12.2 actualTableSize (UInteger16) 15.5.3.7.12.3 portAddress(PortAddress[actualTableSize]) 15.5.3.7.12.4 pad (Octet[M])
269	15.5.3.7.13 UNICAST_MASTER_MAX_TABLE_SIZE management TLV data field 15.5.3.7.13.1 maxTableSize (UInteger16) 15.5.3.7.14 ACCEPTABLE_MASTER_TABLE_ENABLED management TLV data field 15.5.3.7.14.1 EN (Boolean) 15.5.3.7.15 EXT_PORT_CONFIG_PORT_DATA_SET management TLV data field
270	15.5.3.7.15.1 desiredState (Enumeration8) 15.5.3.8 TLV data fields applicable to the defaultDS data set of Transparent Clocks (deprecated) 15.5.3.8.1 TRANSPARENT_CLOCK_DEFAULT_DATA_SET (deprecated) 15.5.3.8.1.1 clockIdentity (ClockIdentity) 15.5.3.8.1.2 numberPorts (UInteger16) 15.5.3.8.1.3 delayMechanism (Enumeration8) 15.5.3.8.1.4 primaryDomain (UInteger8) 15.5.3.8.2 DELAY_MECHANISM (deprecated) 15.5.3.8.3 PRIMARY_DOMAIN (deprecated)
271	15.5.3.8.3.1 primaryDomain (UInteger8) 15.5.3.9 TLV data fields applicable to the transparentClockPortDS data set of Transparent Clocks 15.5.3.9.1 TRANSPARENT_CLOCK_PORT_DATA_SET 15.5.3.9.1.1 portIdentity (PortIdentity) 15.5.3.9.1.2 FLT (Boolean) 15.5.3.9.1.3 logMinPdelayReqInterval (Integer8) 15.5.3.9.1.4 peerMeanLinkDelay (TimeInterval)
272	15.5.3.9.2 LOG_MIN_PDELAY_REQ_INTERVAL 15.5.4 MANAGEMENT_ERROR_STATUS TLV 15.5.4.1 General 15.5.4.2 tlvType 15.5.4.3 lengthField 15.5.4.4 managementErrorId (Enumeration16)
273	15.5.4.5 managementId (Enumeration16) 15.5.4.6 displayData (PTPText) 15.5.4.7 pad (Octet[M]) 16. General optional features 16.1 Unicast message negotiation (optional) 16.1.1 General unicast negotiation PTP operation specifications
275	16.1.2 Unicast negotiation enable 16.1.3 Granting PTP Port operations 16.1.3.1 Cancel Requests for Inactive Service (Handling Abnormal Contract Cancel Request) 16.1.3.2 Acknowledge Responses for Inactive Service (Handling Abnormal Contract Cancel Acknowledgment)
276	16.1.3.3 Acknowledge Responses Opposite of the Cancel Request (Handling Abnormal Contract Cancel Acknowledgment) 16.1.3.4 Single-Direction or Bidirectional Cancel Requests 16.1.3.5 Multiple TLVs attached to same PTP message
277	16.1.4 Unicast TLVs 16.1.4.1 REQUEST_UNICAST_TRANSMISSION TLV specification 16.1.4.1.1 tlvType 16.1.4.1.2 lengthField 16.1.4.1.3 messageType (Enumeration4)
278	16.1.4.1.4 logInterMessagePeriod (Integer8) 16.1.4.1.5 durationField (UInteger32) 16.1.4.2 GRANT_UNICAST_TRANSMISSION TLV specification 16.1.4.2.1 tlvType 16.1.4.2.2 lengthField 16.1.4.2.3 messageType (Enumeration4)
279	16.1.4.2.4 logInterMessagePeriod (Integer8) 16.1.4.2.5 durationField (UInteger32) 16.1.4.2.6 R (Renewal Invited) (Boolean) 16.1.4.3 CANCEL_UNICAST_TRANSMISSION TLV specification 16.1.4.3.1 tlvType 16.1.4.3.2 lengthField 16.1.4.3.3 messageType (Enumeration4) 16.1.4.3.4 R (maintainRequest) (Boolean)
280	16.1.4.3.5 G (maintainGrant) (Boolean) 16.1.4.4 ACKNOWLEDGE_CANCEL_UNICAST_TRANSMISSION TLV specification 16.1.4.4.1 tlvType 16.1.4.4.2 lengthField 16.1.4.4.3 messageType (Enumeration4)
281	16.1.4.4.4 R (maintainRequest) (Boolean) 16.1.4.4.5 G (maintainGrant) (Boolean) 16.2 Path trace (optional) 16.2.1 General
282	16.2.2 pathTraceDS data set specifications 16.2.2.1 General 16.2.2.2 Dynamic members of the pathTraceDS data set 16.2.2.2.1 pathTraceDS.list 16.2.2.3 Configurable members of the pathTraceDS data set 16.2.2.3.1 pathTraceDS.enable 16.2.3 Receipt of an Announce message
283	16.2.4 Transmission of an Announce message 16.2.5 PATH_TRACE TLV specification 16.2.5.1 tlvType 16.2.5.2 lengthField 16.2.5.3 pathSequence (ClockIdentity[N]) 16.3 Alternate timescale offsets (optional) 16.3.1 General
284	16.3.1.1 Using the ALTERNATE_TIME_OFFSET_INDICATOR TLV when the timescale is PTP
285	16.3.1.2 Using the ALTERNATE_TIME_OFFSET_INDICATOR TLV when the timescale is ARB 16.3.1.3 Discontinuities in alternate timescales
286	16.3.2 Propagation by Boundary Clocks 16.3.3 ALTERNATE_TIME_OFFSET_INDICATOR TLV specification 16.3.3.1 General 16.3.3.2 tlvType 16.3.3.3 lengthField 16.3.3.4 keyField (UInteger8)
287	16.3.3.5 currentOffset (Integer32) 16.3.3.6 jumpSeconds (Integer32) 16.3.3.7 timeOfNextJump (UInteger48) 16.3.3.8 displayName (PTPText) 16.3.3.9 pad (Octet[M])
288	16.3.4 alternateTimescaleOffsetsDS data set specifications 16.3.4.1 General 16.3.4.2 AlternateTimescale derived data type 16.3.4.3 Static members of the alternateTimescaleOffsetDS data set 16.3.4.3.1 alternateTimescaleOffsetDS.maxKey 16.3.4.4 Configurable members of the alternateTimescaleOffsetDS data set 16.3.4.4.1 alternateTimescaleOffsetDS.list
289	16.3.4.4.1.1 AlternateTimescale.keyField 16.3.4.4.1.2 AlternateTimescale.enable 16.3.4.4.1.3 AlternateTimescale.currentOffset 16.3.4.4.1.4 AlternateTimescale.jumpSeconds 16.3.4.4.1.5 AlternateTimescale.timeOfNextJump 16.3.4.4.1.6 AlternateTimescale.displayName
290	16.4 Holdover upgrade (optional) 16.4.1 General description of the holdover upgrade option 16.4.1.1 holdoverUpgradeDS.enable 16.4.2 Behavior of a holdover-upgradable PTP Instance when in the disabled state. 16.4.3 Behavior of a holdover-upgradable PTP Instance when in the enabled state.
291	16.5 Isolation of PTP Instances running under profiles specified by different standards organizations (optional) 16.5.1 General
292	16.5.2 PTP Profile specifications for this option 16.6 Common Mean Link Delay Service (optional) 16.6.1 General
293	16.6.2 Using the Common Mean Link Delay Service. 16.6.3 Common Mean Link Delay Service 16.6.3.1 General CMLDS specifications
294	16.6.3.2 CMLDS link measurement operation
295	16.6.4 commonMeanLinkDelayServiceDS data set specifications
296	16.6.4.1 cmldsDefaultDS 16.6.4.1.1 General 16.6.4.1.2 Static members of the cmldsDefaultDS 16.6.4.1.2.1 cmldsDefaultDS.clockIdentity 16.6.4.1.2.2 cmldsDefaultDS.numberLinkPorts 16.6.4.2 cmldsLinkPortDS 16.6.4.2.1 General
297	16.6.4.2.2 Static members of the cmldsLinkPortDS 16.6.4.2.2.1 cmldsLinkPortDS.portIdentity 16.6.4.2.2.2 cmldsLinkPortDS.domainNumber 16.6.4.2.3 Dynamic members of the cmldsLinkPortDS 16.6.4.2.3.1 cmldsLinkPortDS.commonMeanLinkDelayInformation 16.6.4.2.4 Configurable members of the cmldsLinkPortDS 16.6.4.2.4.1 cmldsLinkPortDS.logMinPdelayReqInterval 16.6.4.2.4.2 cmldsLinkPortDS.versionNumber
298	16.6.4.2.4.3 cmldsLinkPortDS.minorVersionNumber 16.6.4.2.4.4 cmldsLinkPortDS.delayAsymmetry 16.6.4.3 cmldsTimestampCorrectionLinkPortDS 16.6.4.3.1 cmldsTimestampCorrectionLinkPortDS.egressLatency 16.6.4.3.2 cmldsTimestampCorrectionLinkPortDS.ingressLatency 16.6.4.4 cmldsAsymmetryCorrectionLinkPortDS 16.6.4.4.1 cmldsAsymmetryCorrectionLinkPortDS.constantAsymmetry 16.6.4.4.2 cmldsAsymmetryCorrectionLinkPortDS.delayCoefficient
299	16.6.4.4.3 cmldsAsymmetryCorrectionLinkPortDS.enable 16.6.4.5 cmldsPerformanceMonitoringLinkPortDS 16.6.5 commonServicesPortDS 16.6.5.1 General 16.6.5.1.1 Static members of the commonServicesPortDS 16.6.5.1.1.1 commonServicesPortDS.cmldsLinkPortPortNumber 16.7 Configurable correction of timestamps (optional) 16.7.1 General
300	16.8 Calculation of the for certain media (optional) 16.8.1 General 16.8.2 Enabling the option 16.8.3 Calculation of the
302	16.9 Mixed multicast/unicast operation (optional) 16.9.1 General
303	16.9.2 Port property TLVs (Optional) 16.9.2.1 PORT_COMMUNICATION_AVAILABILITY TLV (Optional) 16.9.2.1.1 tlvType 16.9.2.1.2 lengthField 16.9.2.1.3 syncMessageAvailability (Boolean[4])
304	16.9.2.1.4 delayRespMessageAvailability (Boolean[4]) 16.9.2.2 PROTOCOL_ADDRESS TLV 16.9.2.2.1 tlvType 16.9.2.2.2 lengthField
305	16.9.2.2.3 portProtocolAddress (PortAddress) 16.9.2.2.4 pad (Octet[M]) 16.10 Cumulative frequency transfer method for synchronizing clocks (optional) 16.10.1 General 16.10.2 Operation of the peer-to-peer delay mechanism using this option
307	16.10.3 Generating the 16.10.3.1 tlvType 16.10.3.2 lengthField
308	16.10.3.3 scaledCumulativeRateRatio (Integer32) 16.10.4 Calculations based on the measured , , and cumulativeRateRatio field of the TLV 16.10.4.1 General 16.10.4.2 meanLinkDelay 16.10.4.3 Ordinary Clocks that are not the Grandmaster Clock of the domain 16.10.4.4 Transparent Clocks and all Boundary Clocks that are not the Grandmaster PTP Instance of the domain
309	16.11 Slave Event Monitoring (optional) 16.11.1 General
310	16.11.2 Slave Event Monitoring Enable 16.11.3 Transmission of PTP messages with Slave Event Monitoring TLVs
311	16.11.4 Ingress Event Monitor TLVs 16.11.4.1 SLAVE_RX_SYNC_TIMING_DATA TLV specification 16.11.4.1.1 tlvType 16.11.4.1.2 lengthField 16.11.4.1.3 syncSourcePortIdentity (PortIdentity)
312	16.11.4.1.4 sequenceId[i] (UInteger16) 16.11.4.1.5 syncOriginTimestamp[i] (Timestamp) 16.11.4.1.6 totalCorrectionField[i] (TimeInterval) 16.11.4.1.7 scaledCumulativeRateOffset[i] (Integer32) 16.11.4.1.8 syncEventIngressTimestamp[i] (Timestamp) 16.11.4.2 SLAVE_RX_SYNC_COMPUTED_DATA TLV specification
313	16.11.4.2.1 tlvType 16.11.4.2.2 lengthField 16.11.4.2.3 sourcePortIdentity (PortIdentity) 16.11.4.2.4 computedFlags (Boolean[8])
314	16.11.4.2.4.1 offsetFromMasterValid flag 16.11.4.2.4.2 meanPathDelayValid flag 16.11.4.2.4.3 scaledNeighborRateRatioValid flag 16.11.4.2.5 sequenceId[i] (UInteger16) 16.11.4.2.6 offsetFromMaster[i] (TimeInterval) 16.11.4.2.7 meanPathDelay[i] (TimeInterval) 16.11.4.2.8 scaledNeighborRateRatio[i] (Integer32)
315	16.11.5 Egress Event Monitor TLVs 16.11.5.1 SLAVE_TX_EVENT_TIMESTAMPS TLV specification 16.11.5.1.1 tlvType 16.11.5.1.2 lengthField 16.11.5.1.3 sourcePortIdentity (PortIdentity) 16.11.5.1.4 eventMessageType (Enumeration4)
316	16.11.5.1.5 sequenceId[i] (UInteger16) 16.11.5.1.6 eventEgressTimestamp[i] (Timestamp) 16.11.6 slaveMonitoringPortDS data set member specifications 16.11.6.1 General 16.11.6.2 slaveMonitoringPortDS.slaveEventMonitoringEnable
317	16.11.6.3 slaveMonitoringPortDS.slaveEventMonitoringEventsPerRxSyncTimingTLV 16.11.6.4 slaveMonitoringPortDS.slaveEventMonitoringEventsPerRxSyncComputedTLV 16.11.6.5 slaveMonitoringPortDS.slaveEventMonitoringEventsPerTxEventTimestampsTLV 16.11.6.6 slaveMonitoringPortDS.slaveEventMonitoringTxEventType 16.11.6.7 slaveMonitoringPortDS.slaveEventMonitoringRxSyncTimingEventMessageM 16.11.6.8 slaveMonitoringPortDS.slaveEventMonitoringRxSyncComputedEventMessageM
318	16.11.6.9 slaveMonitoringPortDS.slaveEventMonitoringTxEventTimestampsEventMessageM 16.12 Enhanced synchronization accuracy metrics (optional) 16.12.1 General
322	16.12.2 ENHANCED_ACCURACY_METRICS TLV specification 16.12.2.1 tlvType 16.12.2.2 lengthField
323	16.12.2.3 bcHopCount (UInteger8) 16.12.2.4 tcHopCount (UInteger8) 16.12.2.5 maxGmInaccuracy (TimeInterval) 16.12.2.6 varGmInaccuracy (Float64) 16.12.2.7 maxTransientInaccuracy (TimeInterval) 16.12.2.8 varTransientInaccuracy (Float64) 16.12.2.9 maxDynamicInaccuracy (TimeInterval) 16.12.2.10 varDynamicInaccuracy (Float64) 16.12.2.11 maxStaticInstanceInaccuracy (TimeInterval)
324	16.12.2.12 varStaticInstanceInaccuracy (Float64) 16.12.2.13 maxStaticMediumInaccuracy (TimeInterval) 16.12.2.14 varStaticMediumInaccuracy (Float64) 16.13 Message Length Extension (optional)
325	16.14 PTP integrated security mechanism (optional) 16.14.1 General
326	16.14.1.1 PTP message Enhancement
327	16.14.2 Requirements of the associated key management
328	16.14.3 Definition of the AUTHENTICATION TLV
329	16.14.3.1 tlvType 16.14.3.2 lengthField 16.14.3.3 SPP (UInteger8)
330	16.14.3.4 secParamIndicator (Boolean[8]) 16.14.3.5 keyID (Octet [4]) 16.14.3.6 disclosedKey (Octet[D])
331	16.14.3.7 sequenceNo (UInteger S) 16.14.3.8 RES (UInteger R) 16.14.3.9 ICV (UInteger K)
332	16.14.4 PTP message processing 16.14.4.1 General requirements 16.14.4.2 General Interactions with SAD and SPD
333	16.14.4.2.1 Inbound PTP messages 16.14.4.2.2 Outbound PTP messages 16.14.4.3 Outbound PTP message processing 16.14.4.3.1 Outgoing PTP message retransmission by Transparent Clocks
334	16.14.4.3.2 Integrity check value calculation 16.14.4.3.3 PTP message retransmission
335	16.14.4.3.4 Event PTP message transmit case 16.14.4.4 Inbound PTP message processing
336	16.14.4.4.1 Integrity check value calculation 16.14.4.4.2 PTP message processing: 16.14.4.4.2.1 Immediate security processing case
337	16.14.4.4.2.2 Delayed security processing case
339	17. State configuration options 17.1 General 17.2 Grandmaster clusters (optional) 17.2.1 General specification
340	17.2.2 Operation of the grandmaster cluster 17.2.3 grandmasterClusterDS data set specifications 17.2.3.1 General
341	17.2.3.2 Static members of the grandmasterClusterDS data set 17.2.3.2.1 grandmasterClusterDS.maxTableSize 17.2.3.3 Configurable members of the grandmasterClusterDS data set 17.2.3.3.1 grandmasterClusterDS.logQueryInterval 17.2.3.3.2 grandmasterClusterDS.actualTableSize 17.2.3.3.3 grandmasterClusterDS.portAddress 17.3 Alternate master (optional) 17.3.1 General
342	17.3.2 Transmission of messages by alternate masters 17.3.3 alternateMasterPortDS data set specifications 17.3.3.1 General 17.3.3.2 Configurable members of the alternateMasterPortDS data set 17.3.3.2.1 alternateMasterPortDS.numberOfAlternateMasters
343	17.3.3.2.2 alternateMasterPortDS.transmitAlternateMulticastSync 17.3.3.2.3 alternateMasterPortDS.logAlternateMulticastSyncInterval 17.3.4 Transmission of Delay_Req 17.3.5 Transmission of Delay_Resp 17.3.6 Summary of Messages for Alternate Master Option
344	17.4 Unicast discovery (optional) 17.4.1 General 17.4.2 Operation of unicast discovery
345	17.4.3 unicastDiscoveryPortDS data set specifications 17.4.3.1 General 17.4.3.2 Static members of the unicastDiscoveryPortDS data set 17.4.3.2.1 unicastDiscoveryPortDS.maxTableSize 17.4.3.3 Configurable members of the unicastDiscoveryPortDS data set 17.4.3.3.1 unicastDiscoveryPortDS.logQueryInterval 17.4.3.3.2 unicastDiscoveryPortDS.actualTableSize 17.4.3.3.3 unicastDiscoveryPortDS.portAddress
346	17.5 Acceptable master table (optional) 17.5.1 General 17.5.2 Operation of the acceptable master table 17.5.3 acceptableMasterTableDS data set specifications 17.5.3.1 General 17.5.3.2 AcceptableMaster derived data type
347	17.5.3.3 Static members of the acceptableMasterTableDS data set 17.5.3.3.1 acceptableMasterTableDS.maxTableSize 17.5.3.4 Configurable members of the acceptableMasterTableDS data set 17.5.3.4.1 acceptableMasterTableDS.actualTableSize 17.5.3.4.2 acceptableMasterTableDS.list 17.5.4 acceptableMasterPortDS data set specifications 17.5.4.1 General
348	17.5.4.2 Configurable members of the acceptableMasterPortDS data set 17.5.4.2.1 acceptableMasterPortDS.enable 17.6 Mechanism for external configuration of a PTP Instance’s PTP Port state (optional) 17.6.1 General specifications
349	17.6.2 defaultDS.externalPortConfigurationEnabled 17.6.3 externalPortConfigurationPortDS 17.6.3.1 General
350	17.6.3.2 externalPortConfigurationPortDS.desiredState 17.6.4 Specifications for the disabled state of this option 17.6.5 Specifications for the enabled state of this option 17.6.5.1 General 17.6.5.2 Value of the portDS.portState when this option is enabled
351	17.6.5.3 Departures from normal operation of the protocol when this option is enabled 17.6.5.4 Updating data sets when this option is enabled
353	17.6.5.5 Receipt of an Announce message from another PTP Instance
354	17.7 Reduced state sets and use of the feature (optional) 17.7.1 General specifications
355	17.7.2 Optional use of selected PTP Port states 17.7.3 Optional use of the feature 18. Interactions between PTP Instances in different PTP domains 18.1 General specifications
356	18.2 Interfaces enabling interdomain interactions 19. Compatibility of this edition with earlier and future editions 19.1 General
357	19.2 Compatibility between version 2 and future versions 19.3 Compatibility with IEEE Std 1588-2002 19.4 Compatibility between the PTP Instance conformant to this edition and the implementations conformant to IEEE Std 1588-2008 19.4.1 General
359	19.4.2 Revision of clause 6- “Clock synchronization model” 19.4.3 Clarification of terms 19.4.4 Updates to options present in 2008 edition
360	19.4.5 Revision of the specifications of a Transparent Clock 19.4.6 Special Ports 19.4.7 Revised specifications for domains 19.4.8 New options permitting management configuration of the states of PTP Ports 19.4.9 New rules on values for clockIdentity
361	19.4.10 Revision of Clause 8 19.4.11 New options and default profile for enhanced synchronization performance 19.4.12 Option for using cumulative rate ratios 19.4.13 Optional Common Mean Link Delay Service providing , and path delays in multi-domain PTP networks using the peer-to-peer delay mechanism 19.4.14 Options for greater security
362	20. Conformance 20.1 Conformance objective 20.2 PTP conformance requirements 20.2.1 General conformance specification 20.2.2 Transport conformance specification 20.2.3 PTP Profile conformance specification
363	20.3 PTP Profiles 20.3.1.1 General 20.3.1.2 PTP Profile recommendations
364	20.3.2 Specific PTP Profiles 20.3.3 PTP Profile specifications
366	Annex A (informative) Using the Precision Time Protocol (PTP)
376	Annex B (informative) Timescales and epochs in PTP
383	Annex C (normative)Transport of PTP over User Datagram Protocol over Internet Protocol Version 4
386	Annex D (normative) Transport of PTP over User Datagram Protocol over Internet Protocol Version 6
388	Annex E (normative) Transport of PTP over IEEE 802.3 transports
390	Annex F (normative) Transport of PTP over DeviceNET
392	Annex G (normative) Transport of PTP over ControlNET
393	Annex H (normative) Transport of PTP over IEC 61158 Type 10
399	Annex I (normative) Default PTP Profiles
408	Annex J (normative) Performance monitoring options (optional)
420	Annex K (informative) Suppression of rogue Announce messages
426	Annex L (normative)Layer-1 based synchronization performance enhancement (optional)
446	Annex M (informative) Sub-nanosecond synchronization using the High Accuracy Default PTP Profile
453	Annex N (informative) Calibration procedures
467	Annex O (informative) Example inter-domain interactions
475	Annex P (informative)Security
496	Annex Q (informative) Bibliography
499	Back cover

Additional information

Standard Title	IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems
Published Code	IEEE
Publication Date	2019

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