Recommendation ITU-T G.8275.1/Y.1369.1 Amendment 3 02/2022) Precision time protocol telecom profile for phase/time synchronization with full timing support from the network
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
     3.1 Terms defined elsewhere
     3.2 Terms defined in this Recommendation
4 Abbreviations and acronyms
5 Conventions
6 Use of PTP for phase/time distribution
     6.1 High-level design requirements
     6.2 PTP modes and options
          6.2.1 PTP domains
          6.2.2 PTP messages used in the profile
          6.2.3 Types of PTP clocks supported in the profile
          6.2.4 One-way versus two-way operation
          6.2.5 One-step versus two-step clock mode
          6.2.6 Ethernet multicast addressing for PTP messages
          6.2.7 PTP mapping
          6.2.8 Message rates
     6.3 Protection aspects and Alternate BMCA
          6.3.1 Alternate BMCA
          6.3.2 Considerations on the use of the localPriority attributes
          6.3.3 Static clock attribute priority1
          6.3.4 Clock attribute priority2
          6.3.5 Other clock attributes
          6.3.6 State decision algorithm
          6.3.7 Data set comparison algorithm
          6.3.8 Unused PTP fields
          6.3.9 Packet timing signal fail
     6.4 Phase/time traceability information
7 ITU-T PTP profile for phase/time distribution with full timing support from the network
8 Security aspects
Annex A  ITU-T PTP profile for phase/time distribution with full timing support from the network
     A.1 Profile identification
     A.2 PTP attribute values
     A.3 PTP options
          A.3.1 Node types required, permitted, or prohibited
          A.3.2 One-step versus two-step clock mode
          A.3.3 Transport mechanisms required, permitted, or prohibited
          A.3.4 Unicast messages
     A.4 Best master clock algorithm options
     A.5 Path delay measurement option (delay request/delay response)
     A.6 Clock identity format
     A.7 Configuration management options
     A.8 Security aspects
     A.9 Other optional features of IEEE 1588
     A.10 PTP common header flags
Annex B  Options to establish the PTP topology with the Alternate BMCA
Annex C  Inclusion of an external phase/time input interface in a T-BC
Annex D  Path trace (optional)
Annex E  Synchronization uncertain indication (optional)
Annex F  Use of stepsRemoved to limit reference chain (optional)
Annex G  Monitoring a PTP MASTER port by a PTP PASSIVE port (optional)
Annex H  Transport of PTP over OTN
Appendix I  Considerations on the use of transparent clock
Appendix II  Considerations on the transmission of Delay_Req messages
Appendix III  Considerations on the choice of the PTP Ethernet multicast destination address
Appendix IV  Considerations on the use of priority2
Appendix V  Description of PTP clock modes and associated contents of Announce messages
Appendix VI  Operations over link aggregation
Appendix VII  Relationship between clockClass and holdover specification
Appendix VIII  Considerations on a T-TSC connected to an end application
Appendix IX  Calculation of offsetScaledLogVariance for T-GM timed by PRTC or ePRTC
     IX.1 Observation interval and TDEV noise generation
     IX.2 Computation of PTP variance from TDEV
     IX.3 Computation of offsetScaledLogVariance from PTP variance
          IX.3.1 Computation of offsetScaledLogVariance for a T-GM timed by a PRTC
          IX.3.2 Computation of offsetScaledLogVariance for a T-GM timed by an ePRTC
Appendix X  Description of a T-BC extended clockClass application
     X.1 Purpose of T-BC extended clockClass application
     X.2 DefaultDS data set member specifications under this extended application
Appendix XI  Considerations on native access equipment
Appendix XII  Monitoring alternate master time information provided by a peer PTP port
Appendix XIII  Considerations on the use of [IEEE 1588-2019]
Appendix XIV  Considerations in an environment of more than two PTP ports on a single PTP communication path when using transparent clocks and multicast addressing
Appendix XV  Considerations of deploying ePRTC and PRTC in the network
Bibliography
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