Table of Contents - G.959.1 (2024) Amd. 2 (05/2025) -

1	Scope
2	References
3	Terms and 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	Multichannel inter-domain interfaces
	6.5	Single-channel inter-domain interfaces
	6.6	Management signal implementations
7	Transverse compatibility
8	Parameter definitions
	8.1	System operating wavelength range
	8.2	Parameters
9	Parameter values
	9.1	Multichannel IrDI
	9.2	Single-channel IrDI
10	Optical safety considerations
11	Power level management
Annex A – Configuration for method A for assessment of single-channel characteristics in a multichannel IrDI
	A.1	Reference configuration
Annex B – Reference optical bandpass filter and reference receiver characteristics for method B, for assessment of single-channel characteristics in a multichannel IrDI
	B.1	Reference configuration
	B.2	Reference optical bandpass filter
	B.3	Reference receiver
Appendix I – Single-channel client interfaces with 3R regeneration
	I.1	Introduction
	I.2	Description of client signal interfaces with 3R regeneration
Appendix II – Generic reference points within the OTN
Appendix III – Clarification of use of reference points within IrDI and IaDI
Appendix IV – Considerations for management signal implementations
	Page
	IV.1	Optical tributary signal management signal implementation
	IV.2	Optical multiplex section and optical transmission section management signal implementation
Appendix V – Nomenclature for the highest class of optical tributary signal supported
Appendix VI – Optical tributary signal class RZ 40G applications
Appendix VII – Applications using electronic dispersion compensation
Bibliography