Table of Contents

 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     Optical transport network interface structure           
        6.1     Basic signal structure  
        6.2     Information structure for OTN interfaces          
 7     Multiplexing/mapping principles and bit rates           
        7.1     Mapping          
        7.2     Wavelength division multiplex               
        7.3     Bit rates and capacity 
        7.4     ODUk time‑division multiplex 
 8     Optical transport module (OTM‑n.m, OTM‑nr.m, OTM‑0.m, OTM-0.mvn)    
        8.1     OTM with reduced functionality (OTM‑0.m, OTM‑nr.m, OTM-0.mvn)  
        8.2     OTM with full functionality (OTM‑n.m)              
 9     Physical specification of the ONNI   
        9.1     OTM‑0.m         
        9.2     OTM‑nr.m       
        9.3     OTM‑n.m        
        9.4     OTM-0.mvn    
10     Optical channel (OCh)         
       10.1     OCh with full functionality (OCh)         
       10.2     OCh with reduced functionality (OChr)             
11     Optical channel transport unit (OTU)            
       11.1     OTUk frame structure              
       11.2     Scrambling     
12     Optical channel data unit (ODUk)   
       12.1     ODUk frame structure              
       12.2     ODUk bit rates and bit-rate tolerances              
13     Optical channel payload unit (OPUk)            
14     OTM overhead signal (OOS)             
15     Overhead description         
       15.1     Types of overhead     
       15.2     Trail trace identifier and access point identifier definition         
       15.3     OTS OH description    
       15.4     OMS OH description  
       15.5     OCh OH description   
       15.6     OTUk/ODUk frame alignment OH description
       15.7     OTUk OH description
       15.8     ODUk OH description
       15.9     OPUk OH description
16     Maintenance signals            
       16.1     OTS maintenance signals         
       16.2     OMS maintenance signals       
       16.3     OCh maintenance signals        
       16.4     OTUk maintenance signals     
       16.5     ODUk maintenance signals     
       16.6     Client maintenance signal       
17     Mapping of client signals    
       17.1     OPUk client signal fail (CSF)    
       17.2     Mapping of CBR2G5, CBR10G, CBR10G3 and CBR40G signals into OPUk              
       17.3     Mapping of ATM cell stream into OPUk (k=0,1,2,3)     
       17.4     Mapping of GFP frames into OPUk (k=0,1,2,3,4,flex)  
       17.5     Mapping of test signal into OPUk        
       17.6     Mapping of a non-specific client bit stream into OPUk               
       17.7     Mapping of other constant bit-rate signals with justification into OPUk             
       17.8     Mapping a 1000BASE-X and FC-1200 signal via timing transparent transcoding into OPUk    
       17.9     Mapping a supra-2.488 CBR Gbit/s signal into OPUflex               
                  17.9.1     FC-400 and FC-800       
                  17.9.2     FC-1600            
18     Concatenation        
       18.1     Virtual concatenation of OPUk             
       18.2     Mapping of client signals         
       18.3     LCAS for virtual concatenation              
19     Mapping ODUj signals into the ODTU signal and the ODTU into the HO OPUk tributary slots    
       19.1     OPUk tributary slot definition               
       19.2     ODTU definition          
       19.3     Multiplexing ODTU signals into the OPUk        
       19.4     OPUk multiplex overhead and ODTU justification overhead   
       19.5     Mapping ODUj into ODTUjk   
       19.6     Mapping of ODUj into ODTUk.ts          
Annex A – Forward error correction using 16-byte interleaved RS(255,239) codecs    
Annex B – Adapting 64B/66B encoded clients via transcoding into 513B code blocks    
        B.1     Transmission order     
        B.2     Client frame recovery
        B.3     Transcoding from 66B blocks to 513B blocks     
        B.4     Link fault signalling      
Annex C – Adaptation of OTU3 and OTU4 over multichannel parallel interfaces    
Annex D – Generic mapping procedure principles    
        D.1     Basic principle               
        D.2     Applying GMP in OTN
        D.3     Cm(t) encoding and decoding 
        D.4     SCnD(t) encoding and decoding             
Annex E – Adaptation of parallel 64B/66B encoded clients    
        E.1     Introduction   
        E.2     Clients signal format   
        E.3     Client frame recovery
        E.4     Additions to Annex B transcoding for parallel 64B/66B clients  
Annex F – Improved robustness for mapping of 40GBASE-R into OPU3 using 1027B code blocks    
        F.1     Introduction   
        F.2     513B code block framing and flag bit protection             
        F.3     66B block sequence check       
Appendix I – Range of stuff ratios for asynchronous mappings of CBR2G5, CBR10G, and CBR40G clients with ±20 ppm bit-rate tolerance into OPUk, and for asynchronous multiplexing of ODUj into ODUk (k > j)    
Appendix II – Examples of functionally standardized OTU frame structures     
Appendix III – Example of ODUk multiplexing    
Appendix IV – Example of fixed stuff in OPUk with multiplex of lower‑order ODUk signals    
Appendix V – ODUk multiplex structure identifier (MSI) examples    
Appendix VI – Parallel logic implementation of the CRC-8 and CRC-5    
Appendix VII – OTL4.10 structure    
Appendix VIII – CPRI into LO ODU mapping    
Appendix IX – Overview of CBR clients into LO OPU mapping types    
Appendix X – Overview of LO ODU into HO OPU mapping types    
Appendix XI – Derivation of recommended ODUflex(GFP) bit-rates and examples of ODUflex(GFP) clock generation    
       XI.1     Introduction  
       XI.2     Tributary slot sizes      
       XI.3     Example methods for ODUflex(GFP) clock generation