CONTENTS

 1     Scope        
 2     References             
 3     Terms and definitions         
        3.1     Terms defined elsewhere      
        3.2     Terms defined in this Recommendation          
 4     Abbreviations         
 5     Conventions           
 6     Optical transport network interface structure          
        6.1     Basic signal structure             
        6.2     Information structure for the 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    
       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           
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    
      Page
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     C_m(t) encoding and decoding
        D.4     SC_nD(t) encoding and decoding           
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    
Appendix VI – ODUk multiplex structure identifier (MSI) examples    
Appendix VII – Adaptation of parallel 64B/66B encoded clients    
      VII.1     Introduction 
      VII.2     Clients signal format
      VII.3     Client frame recovery           
      VII.4     Additions to Annex B transcoding for parallel 64B/66B clients 
Appendix VIII – Improved robustness for mapping of 40GBASE-R into OPU3 using 1027B code blocks     
     VIII.1     Introduction 
     VIII.2     513B code block framing and flag bit protection         
     VIII.3     66B block sequence check     
Appendix IX – Parallel logic implementation of the CRC-8 and CRC-5    
Appendix X – OTL4.10 structure    
Appendix XI – CPRI into LO ODU mapping    
Appendix XII – Overview of CBR clients into LO OPU mapping types    
Bibliography