Table of Contents - G Suppl. 90 (10/2025) - Coexistence between G.fin and G.Xfin systems

1	Scope
2	References
3	Abbreviations and acronyms
4	Introduction
5	The motivation of the Coexistence between G.fin and G.Xfin
	5.1	Preserve the assets of the originally deployed FIP equipment
	5.2 	Reduce the installation workload
	5.3	Enhance the flexibility for customized services
6	Use cases and Requirements of Coexistence between G.fin and G.xfin
	6.1	Wavelength division coexistence between G.fin and G.Xfin
	6.2	Time division coexistence between G.fin and G.Xfin
	6.3	Coexistence between Ra and Rb option
7	Summary and future work suggestion