1     Scope 
 2     References 
        2.1     Normative references         
        2.2     Informative reference         
 3     Terms and definitions       
        3.1     Definitions 
        3.2     Terms defined in other Recommendations   
 4     Abbreviations   
 5     Classification of optical interfaces 
        5.1     Applications          
        5.2     Reference points    
        5.3     Nomenclature        
        5.4     Multichannel inter-domain interfaces           
        5.5     Single-channel inter-domain interfaces        
        5.6     Management signal implementations           
 6     Transverse compatibility   
 7     Parameter definitions        
        7.1     System operating wavelength range
        7.2     Parameters
 8     Parameter values 
        8.1     Multichannel IrDI   
        8.2     Single channel IrDI
 9     Optical safety considerations        
10     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    
       IV.1     Optical channel 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