Table of Contents - G.709.20 (2024) Amd. 1 (05/2025) -

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	Application scenario and hypothetical reference modes of fgOTN
	6.1	Application scenario
	6.2	Hypothetical reference model (HRM) of fgOTN
7	General functional requirements of fgOTN
8	Overview of fgOTN Rcommendation series
	8.1	fgOTN architecture
	8.2	fgOTN interface
	8.3	Hitless resizing
	8.4	Protection
	8.5	Equipment
	8.6	Synchronization
Annex A – Reference network model example
Annex B – Detailed functional requirements of fgOTN
	B.1	fgOTN layer architecture
	B.2	fgOTN frame format
	B.3	fgOTN/client adaptation functions
	B.4	ODUk/fgOTN adaptation functions
	B.5	Protection
	B.6	Equipment
	B.7	Synchronization
	B.8	Management
	B.9	Hitless resizing