Table of Contents - G.8265.1/Y.1365.1 (2022) Amd. 1 (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 frequency distribution
	6.1	High-level design requirements
	6.2	General description
	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	Additional protection functions
7	ITU-T PTP profile for frequency distribution without timing support from the network
8	Security aspects
Annex A – ITU-T PTP profile for frequency distribution without 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 (BTCA) options
	A.5	Path delay measurement option (delay request/delay response)
	A.6	Configuration management options
	A.7	Clock identity format
	A.8	Flags used by this profile
	A.9	Control field (controlField)
	A.10 	Profile version compatibility
Appendix I – Use of mixed unicast/multicast mode for PTP messages
Appendix II – Considerations on selecting timeout values
	II.1	Example of receipt timeout calculation (dynamic message rate)
	II.2	Example of receipt timeout calculation (fixed message rate)
	II.3	Range of receipt timeout
Appendix III – Considerations on the use of IEEE1588-2019
Bibliography