Table of Contents

 1     Scope          
 2     References               
 3     Definitions 
 4     Abbreviations and acronyms             
 5     Conventions             
 6     Optical extension schemes and architectures            
        6.1     OA-based reach extenders     
        6.2     OEO-based reach extenders   
        6.3     Hybrid architectures   
        6.4     Wavelength conversion reach extenders          
        6.5     Wavelength re-conversion at OLT        
        6.6     Combination G-PON and XG-PON reach extenders      
        6.7     Increased fanout reach extenders       
 7     General requirements on XG-PON reach extenders               
        7.1     Compatibility 
        7.2     Management
        7.3     Power               
        7.4     Optional enhancements           
 8     Specifications for mid-span extenders          
        8.1     Optical trunk line          
        8.2     Optical trunk line interface (R'/S') and OLT interface (S/R)         
        8.3     Optical distribution network   
        8.4     Extender interface to optical distribution network (S'/R') and ONU interface (R/S)        
        8.5     TC layer impacts           
        8.6     WDM wavelength allocation plan for OTL          
Appendix I – Implications on OLT receivers due to insertion of OA type extenders    
Appendix II – Protection    
       II.1     Introduction   
       II.2     RE-independent type B protection       
       II.3     OEO extender based Type B protection             
       II.4     OA- Extender based Type B protection architecture     
Appendix III – Optical time domain reflectometer    
      III.1     Introduction   
      III.2     Solution            
Appendix IV – Transport of BM-to-CM converted signals over OTN    
Appendix V – Possible realization of OA and OEO-based extenders using wavelength conversion    
        V.1     A transparent wavelength plan extender realization   
        V.2     A conventional wavelength plan extender realization
        V.3     An OWC based extender realization