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     Use of PTP for phase/time distribution         
        6.1     High-level design requirements           
        6.2     PTP modes and options           
        6.3     Protection aspects and Alternate BMCA           
        6.4     Phase/time traceability information   
 7     ITU-T PTP profile for phase/time distribution with full timing support from the network        
 8     Security aspects     
Annex A – ITU-T PTP profile for phase/time distribution with full timing support from the network    
        A.1     Profile identification 
        A.2     PTP attribute values  
        A.3     PTP options  
        A.4     Best master clock algorithm options  
        A.5     Path delay measurement option (delay request/delay response)          
        A.6     Clock identity format
        A.7     Configuration management options  
        A.8     Security aspects          
        A.9     Other optional features of IEEE 1588  
       A.10     PTP common header flags     
       A.11     Profile version compatibility 
Annex B – Options to establish the PTP topology with the Alternate BMCA    
Annex C – Inclusion of an external phase/time input interface in a T-BC    
Annex D – Path trace (optional)    
Annex E – Synchronization uncertain indication (optional)    
Annex F – Use of stepsRemoved to limit reference chain (optional)    
Annex G – Monitoring alternate master time information provided by a peer PTP port (optional)    
        G.1     Use Case 1 – PASSIVE port monitoring MASTER port   
        G.2     Use Case 2 –MASTER port monitoring PASSIVE port    
        G.3     Use Case 3 –MASTER port monitoring MASTER port    
Annex H – Transport of PTP over OTN    
Annex I – Transport PTP over MTN    
Annex J – Transport PTP over FlexE Links    
Annex K – Dynamic Monitoring based on PTSF (Optional)    
Appendix I – Considerations on the use of transparent clock    
Appendix II – Considerations on the transmission of Delay_Req messages    
Appendix III – Considerations on the choice of the PTP Ethernet multicast destination address    
Appendix IV – Considerations on the use of priority2    
Appendix V – Description of PTP clock modes and associated contents of Announce messages    
Appendix VI – Operations over link aggregation    
Appendix VII – Relationship between clockClass and holdover specification    
Appendix VIII – Considerations on a T-TSC connected to an end application    
Appendix IX – Calculation of offsetScaledLogVariance for T-GM timed by PRTC or ePRTC    
       IX.1     Observation interval and TDEV noise generation          
       IX.2     Computation of PTP variance from TDEV          
       IX.3     Computation of offsetScaledLogVariance from PTP variance   
Appendix X – Description of a T-BC extended clockClass application    
        X.1     Purpose of T-BC extended clockClass application          
        X.2     DefaultDS data set member specifications under this extended application      
Appendix XI – Considerations on native access equipment    
Appendix XII – Monitoring alternate master time information provided by a peer PTP port    
Appendix XIII – Considerations on the use of [IEEE 1588-2019]    
Appendix XIV – Considerations in an environment of more than two PTP ports on a single PTP communication path when using transparent clocks and multicast addressing     
Appendix XV – Considerations of deploying ePRTC and PRTC in the network    
Bibliography