Amendment 1 to Recommendation ITU-T G.8275.2 (2016/06) provides the following updates: " Updated Scope and References " Modified Clauses 6.6, 6.7.9, 6.7.11, 6.8, A.10 " Added Annex F Mapping from PTP clockClass values to Quality Levels " Added Appendix III PTP Monitoring Backup Scenario Example " Added Appendix IV Description of PTP clock states and associated contents of Announce messages " Added Appendix V BMCA cycling between masters " Added Appendix VI Considerations of PTP over IP transport in ring topologies