Table of Contents

 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     Functional architecture of optical transport networks        
 7     OTN digital layers      
        7.1     Optical channel data unit (ODU) layer network        
        7.2     Optical channel transport unit (OTU) layer network 
        7.3     Client/server associations               
 8     OTN optical entities   
        8.1     Optical channel (OCh) layer network          
        8.2     Optical multiplex section (OMS)   
        8.3     Optical transmission section (OTS)              
        8.4     Media entities   
        8.5     Client/server associations               
 9     OTN topology             
        9.1     Unidirectional and bidirectional connections             
        9.2     Point-to-multipoint media channels             
10     OTN management    
       10.1     Generic requirements     
       10.2     OTN network management requirements 
       10.3     Connection supervision techniques            
       10.4     Connection supervision applications          
11     OTN survivability techniques 
       11.1     Protection techniques    
       11.2     Network restoration       
12     Subdividing of the OTN           
       12.1     Domains using the black link approach     
Appendix I – Examples of multi-domain OTN applications    
Appendix II – Construction of optical channel connections    
Appendix III – An example of the use of the black link approach    
Appendix IV – Relationship between Recommendations ITU-T G.872 and ITU-T G.798