Table of Contents - G.8275.2/Y.1369.2 (2022) Amd. 2 (08/2024) -

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
	6.3	PTP modes
	6.4	PTP mapping
	6.5	Message rates
	6.6	Unicast message negotiation
	6.7	Alternate BTCA, telecom timeReceiver model and timeTransmitter selection process
	6.8	Phase/time traceability information
	6.9	Use of alternate timeTransmitter flag
	6.10	Dataset member for PTP clockMode (optional)
	6.11	Dataset member for PTP nodeClass (optional)
7	ITU-T PTP profile for phase/time distribution with partial timing support from the network
8	Security aspects
Annex A – ITU-T PTP profile for time distribution with partial timing support from the network (unicast mode)
	A.1	Profile identification
	A.2	PTP attribute values
	A.3	PTP options
	A.4	Best timeTransmitter clock algorithm options
	A.5	Path delay measurement option (delay request/delay response)
	A.6	Configuration management options
	A.7	Clock identity format
	A.8	Security aspects
	A.9	Other optional features of [IEEE 1588]
	A.10	PTP common header flags
	A.11	Profile version compatibility
	A.12	Other optional features used in this profile
Annex B – Options to establish the PTP topology with the Alternate BTCA
	Page
Annex C – Inclusion of an external phase/time input interface on a PTP clock
Annex D – TLV for PTP interface rate (optional)
Annex E – Synchronization uncertain indication (optional)
Annex F – Mapping from PTP clockClass values to quality levels
Appendix I – Considerations on the use of priority2
Appendix II – Considerations on a T-TSC-A or T-TSC-P connected to an end application
Appendix III – PTP monitoring backup scenario example
Appendix IV – Description of PTP clock modes and associated contents of Announce messages
Appendix V – BTCA cycling between Telecom Grandmasters
	V.1	Scenario where a PTP clock's BTCA cycles between two T-GMs
	V.2	Approaches to avoid a PTP clock's BTCA from cycling between two timeTransmitters
Appendix VI – Considerations of PTP over IP transport in ring topologies
Appendix VII – Considerations on the configuration of PTSF-lossOfTimingMessages
Appendix VIII – Operations over link aggregation
	VIII.1	Functional model
	VIII.2	Scenario
Appendix IX – Considerations on the use of [IEEE 1588-2019]
Appendix X – Considerations on selecting time out values
	X.1	Example receipt timeout calculation (Dynamic message rate)
	X.2	Example receipt timeout calculation (Fixed message rate)
	X.3	Range of receipt timeout
Bibliography