Table of Contents - G.8273/Y.1368 (2023) Amd. 1 (05/2025) -

1	Scope
2	References
3	Definitions
4	Abbreviations and acronyms
5	Conventions
6	General introduction of phase and time clocks
Annex A – Testing and measurement of time or phase clocks
	A.1	Introduction
	A.2	Grandmaster clocks
	A.3	Boundary clocks
	A.4	Transparent clocks
	A.5	Telecom time synchronous clocks
	A.6	Clocks containing media converters
Annex B – Phase or time clock equipment specification-related measurement methods
	B.1	Overview
	B.2	Telecom grandmaster test
	B.3	Telecom boundary clock test
	B.4	Measurement set-up for systems with transparent clocks
	B.5	Measurement set-up for systems with T-TSC
	B.6	Traffic test pattern for time clocks
Appendix I – Variable temperature testing methodology
Appendix II – Variable temperature holdover testing methodology
Appendix III – Physical layer frequency clock transient testing methodology
	III.I	Introduction
	III.2	Short-term transient testing for class A, B and C clocks
	III.3	Long-term transient testing for class C clocks
Appendix IV – Measurement of noise transfer using least squares method
Bibliography