Table of Contents - G.8275 (2024) Amd. 1 (08/2024) -
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
7.3 Packet network partitioning
8 Security aspects
9 Management aspects
Annex A – Time/phase models based on ITUT 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 networks
E.1 Use of timeTransmitterOnly
E.2 Use of notTimeTransmitter
Annex F – Performance monitoring (optional)
F.1 Data storage
F.2 Use cases when local PTP clock is not used for timestamping
F.3 Considerations for [ITUT G.8275.2]
F.4 Time reference information per PTP instance
F.5 Time reference information per PTP port
Appendix I – Architecture for time and phase distribution over a packet network providing PTS at the protocol level
I.1 Architecture for PTS
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 [ITUT G.8275.1] and [ITUT G.8275.2] profiles
III.3 Generation of the physical layer frequency signal by the IWF
III.4 Mapping IWF to telecom PTP clocks
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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 TBC/ TBCP/ TBCA
VIII.4 TGM Announce message contents based on the internal PTP clock modes
VIII.5 TBC/ TBCP/ TBCA Announce message contents based on the internal PTP clock modes
Appendix IX – Considerations on the use of [IEEE 15882019]
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
Appendix XIII – Considerations on PTP Security
XIII.1 Options for protecting PTP
XIII.2 Combinations of security mechanisms
Bibliography
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