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     Reference models and system requirements   
        5.1     System reference models            
        5.2     Application reference models     
        5.3     FTU protocol reference model    
        5.4     FTU functional model    
        5.5     INP system requirements            
 6     Profiles         
        6.1     Definition          
        6.2     Profile compliance          
 7     Transmission medium interface characteristics              
        7.1     Duplexing method          
        7.2     Frequency band              
        7.3     Power spectral density 
        7.4     Out-of-band PSD limit    
        7.5     Termination impedance
        7.6     Maximum aggregate transmit power      
 8     Transport protocol specific transmission convergence (TPS‑TC) function 
        8.1     Functional reference model         
        8.2     Generic DTU format      
        8.3     Packet-based TPS-TC (PTM-TC)  
        8.4     Network timing reference (NTR)
        8.5     Time‑of‑day (ToD)          
 9     Physical media specific transmission convergence (PMS‑TC) sub-layer     
        9.1     Functional reference model         
        9.2     DTU scrambler
        9.3     DTU encoder   
        9.4     Interleaver       
        9.5     Data frame multiplexer
        9.6     RMC   
        9.7     Acknowledgement         
        9.8     Retransmission function              
10     Physical media dependent (PMD) function       
       10.1     PMD functional reference model              
       10.2     Symbol encoder             
       10.3     Precoder (downstream vectoring)           
       10.4     Modulation     
       10.5     TDD frame structure   
       10.6     Superframe structure  
       10.7     Normal and discontinuous operation intervals     
       10.8     Alignment of transmissions in vectored group     
11     Operation and maintenance (OAM)   
       11.1     OAM functional model 
       11.2     Management functions and procedures over eoc
       11.3     OAM primitives             
       11.4     OAM parameters          
12     Link activation methods and procedures          
       12.1     Overview         
       12.2     Special operations channel (SOC)             
       12.3     Initialization procedure               
       12.4     Loop diagnostics mode
13     Online reconfiguration (OLR)
       13.1     Overview         
       13.2     Eoc-based procedures 
       13.3     RMC-based procedures              
       13.4     Low power states         
14     Electrical requirements         
       14.1     Balance            
       14.2     Differential port impedance       
Appendix I – Wiring topologies and reference loops    
        I.1                   Wiring topologies              
        I.2                   Reference loops 
Appendix II – Example OLR use cases    
       II.1     Transmitter initiated gain adjustment (TIGA)         
Appendix III – Motivation of MTBE accelerated test    
Appendix IV – Upstream dynamic resource reports    
Appendix V – Retransmission buffer size and the achievable bit-rate    
        V.1     Case 1: NSYM_ret+NSYM_ack+1 ≤ Mus        
        V.2     Case 2: NSYMret+NSYMack+1≥Mus      
        V.3     Case 3: Lower bound for the achievable net data rate        
        V.4     Memory size example  
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Appendix VI – Example applications of discontinuous operation    
       VI.1     Discontinuous operation with vectoring disabled 
       VI.2     Examples of discontinuous operation with vectoring enabled          
Bibliography