Recommendation ITU-T G.8275 (01/2024) Architecture and requirements for packet-based time and phase distribution
Summary
History
FOREWORD
Table of Contents
1 Scope
2 References
3 Definitions
4 Abbreviations and acronyms
5 Conventions
6 General introduction to packet-based time/phase distribution
     6.1 Requirements for packet-based time and phase distribution
7 Architecture of packet-based time/phase distribution
     7.1 Packet-based time and phase distribution
     7.2 Time/phase protection aspects
          7.2.1 Packet timeTransmitter (pTT) protection
          7.2.2 Packet timeReceiver (pTR) protection
               7.2.2.1 Protection scenario 1
               7.2.2.2 Protection scenario 2
               7.2.2.3 Protection scenario 3
     7.3 Packet network partitioning
8 Security aspects
9 Management aspects
Annex A  Time/phase models based on ITU-T G.805
Annex B  Inclusion of a virtual PTP port on a PTP clock
Annex C  Options to establish the PTP topology with the alternate BTCA
Annex D  Synchronization uncertain indication (optional)
Annex E  Use of the timeTransmitterOnly and notTimeTransmitter parameters  in the networks
Annex F  Performance monitoring (optional)
     F.1 Data storage
          F.1.1 Regular data storage:
          F.1.2 Simplified data storage:
     F.2 Use cases when local PTP clock is not used for timestamping
     F.3 Considerations for [ITU-T G.8275.2]
     F.4 Time reference information
Appendix I  Architecture for time and phase distribution over a packet network  providing PTS at the protocol level
     I.1 Architecture for PTS
          I.1.1 Timing distribution architecture
          I.1.2 Timing protection aspects
          I.1.3 Partitioning across multiple administrative domains
          I.1.4 Use of multiple underlying technologies
Appendix II  An example of PRTC switching by the BTCA in a ring network
Appendix III  Generic IWF node
     III.1 Introduction
     III.2 Inter-working between the [ITU-T G.8275.1] and [ITU-T G.8275.2] profiles
     III.3 Generation of the physical layer frequency signal by the IWF
     III.4 Mapping IWF to telecom PTP clocks
Appendix IV  Use cases for mapping from PTP clockClass values to quality levels
     IV.1 Use case I
     IV.2 Use case II
Appendix V  Deployment examples and the use of partially aware deviceTypes
Appendix VI  cnPRTC functional architecture
Appendix VII  cnPRTC deployment scenarios
Appendix VIII  Description of PTP clock modes and associated contents of Announce messages
     VIII.1 Purpose of this appendix
     VIII.2 Description of the modes
     VIII.3 Example of mapping between PTP port states and PTP clock modes for a 3-port T-BC/T-BC-P/T-BC-A
     VIII.4 T-GM Announce message contents based on the internal PTP clock modes
     VIII.5 T-BC/T-BC-P/T-BC-A Announce message contents based on the internal PTP clock modes
Appendix IX  Considerations on the use of [IEEE 1588-2019]
Appendix X   Flexible synchronization network based on cnPRTC
Appendix XI  Information that can be used in the analysis of the performance monitoring data
Appendix XII  Updated terminology for PTP clocks and PTP profiles
Bibliography