Table of Contents - G.8273.4 (08/2024) - Timing characteristics of telecom boundary clocks and telecom time synchronous clocks for use with partial timing support from the network

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	Physical layer frequency performance requirements
7	Performance requirements for T-BC-A and T-TSC-A
	7.1	Frequency accuracy
	7.2	Time error noise generation
	7.3	Noise tolerance
	7.4	Local time reference (1 PPS) to PTP and local time reference (1 PPS) to 1 PPS noise transfer
	7.5	PTP output and 1 PPS output transient response (short term) due to loss and restoration of local time reference (1 PPS) input
	7.6	Holdover performance
8	Performance requirements for T-BC-P and T-TSC-P
	8.1	Frequency accuracy
	8.2	Time error noise generation
	8.3	Noise tolerance
	8.4	Noise transfer
	8.5	Transient response (short-term)
	8.6	Holdover performance
9	Interfaces
	9.1	Phase and time interfaces
	9.2	Frequency interfaces
Annex A – T-TSC-A and T-BC-A functional model
Annex B – T-TSC-P and T-BC-P functional model
Appendix I – Consideration of timeReceiver clocks embedded in end applications
Appendix II – Consideration of variable temperature testing
Appendix III – Consideration of the use of a synchronous equipment clock to maintain  time holdover for partial timing support networks
Appendix IV – Use of a synchronous equipment clock to assist a PTP time lock
Appendix V – Synchronization interworking function P-F node limits
Appendix VI – PTP noise tolerance testing for PTS and APTS clocks
	VI.1	Testing set-up for PTP noise tolerance testing
	Page
	VI.2	Statistical PDV model
	VI.3	Parameters for the PDV model
	VI.4	Different requirements for APTS and PTS models
	VI.5	Example delay patterns
	VI.6	Output requirements
Appendix VII – Analysis of conversion of network limits to equipment specification for APTS
	VII.1	Total noise budget between network limits
	VII.2	Holdover operation
	VII.3	Transient operation and switching
	VII.4	Dynamic noise accumulation for APTS
Appendix VIII – Analysis of conversion of network limits to equipment specification for PTS
	VIII.1	Total noise between network limit C and network limit D
	VIII.2	Holdover operation
	VIII.3	Transient operation and switching
	VIII.4	Dynamic noise accumulation for PTS (constant temperature)
Bibliography