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����