Table of Contents - G.9804.3 (2021) Amd. 3 (02/2026) -

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	Architecture of the optical access network
	6.1	Classes for optical path loss
	6.2	Categories for fibre differential distance
7	This clause is intentionally left blank
8	This clause is intentionally left blank
9	Optical network requirements
	9.1	Layered structure of optical network
	9.2	PMD layer requirements for the 50G-PON
10	X/S tolerance of 50G-PON ONU and OLT
	10.1	Versatile WDM configuration
11	Upstream physical layer overhead
Appendix I – Relationship between OMA, penalty, extinction ratio and average power
Appendix II – Physical layer measurements required to support optical layer supervision
Appendix III – Allocation of the physical layer overhead time
Appendix IV – Relationship among optical interface parameters for 49.7664 Gbit/s downstream
Bibliography