Table of Contents - G.641 (11/2025) - Terrestrial free-space optics for mobile backhaul with short reach interfaces

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	Classification of optical interfaces
	6.1	Applications
	6.2	Reference points
	6.3	Nomenclature
	6.4	Application codes
7	Parameter definitions
	7.1	General information
	7.2	Interface at point SS
	7.3	Interface at point FPS
	7.4	Free-space optical path from point FPS to FPR
	7.5	Interface at point FPR
	7.6	Interface at point RS
8	Parameter values
9	Optical safety considerations
Appendix I – Definitions of free-space optical link related parameters and calculation of link attenuation
	I.1	Visibility
	I.2	Scintillation
	I.3	Definition of angle of arrival (AOA) loss and AOA statistical model
	I.4	Definition of solar radiation
	I.5	Calculation of link attenuation
Appendix II – A media model for bidirectional application
Bibliography