SummaryRecommendation ITU-T G.8275.1/Y.1369.1 contains the ITU-T precision time protocol (PTP) profile for phase and time distribution with full timing support from the network. It provides the necessary details to utilize IEEE 1588 in a manner consistent with the architecture described in Recommendation ITU‑T G.8275/Y.1369. Amendment 1 provides the following updates: – added ITU-T G.8271 to references; – addition of a new definition: special port (3.2); – clarification on the use of logMessageInterval in Delay_Resp messages (6.2.8); – clarification on the behaviour of the T-BC Announce message contents when the T-BC has a parent clock; – incremented the minor revision number of the profileVersion (Annex A); – correction to the handling of the alternateMasterFlag; – added informative text on the handling of the synchronizationUncertain flag (Annex E); – added monitoring of a PTP MASTER port by a PTP PASSIVE port (Annex G); – updates to Announce message fields of currentUtcOffset and synchronizationUncertain when using PTP clock states (Appendix V); – update of Appendix VII; – added informative use cases for the use of the priority2 attribute (Appendix X); – added considerations on native access equipment (Appendix XI); – added monitoring alternate master time information provided by a peer PTP port (Appendix XII). |