Recommendation ITU-T G.997.3 specifies the physical layer management for multi-gigabit fast access to subscriber terminals (MGfast) transmission systems. It specifies managed objects for configuration, fault, status, inventory and performance management. Amendment 1 to ITU-T Rec G.997.3 add the following new material: – Annex D and Annex T of ITU-T G.9711 diagnostics and monitoring objects In addition, it corrects the following items: – The description of the RMCR success counters in Table 7-9. – A typological inconsistency in the naming of the persistency managed objects. The changes relative to new material are with the following change bars. The changes relative to corrected items are with the following change bars.