Summary

Recommendation ITU-T G.8275.2/Y.1369.2 contains the ITU-T precision time protocol (PTP) profile for phase/time distribution with partial timing support from the network (unicast mode). 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. This Recommendation defines the PTP profile for unicast mode only. Future editions of this Recommendation may contain a separate profile for a mixed unicast/multicast case.

Amendment 1 provides the following updates:

•            Updates Scope and References

•            Modifies clauses 6.6, 6.7.9, 6.7.11, 6.8, A.10

•            Adds Annex F, Mapping from PTP clockClass values to Quality Levels

•            Adds Appendix III, PTP Monitoring Backup Scenario Example

•            Adds Appendix IV, Description of PTP clock states and associated contents of Announce messages

•            Adds Appendix V, BMCA cycling between masters

•            Adds Appendix VI, Considerations of PTP over IP transport in ring topologies.