Recommendation ITU-T G.7721 provides the management requirements and a protocol-neutral management information model for managing network elements and network of synchronization, based on the synchronization architecture and equipment defined in ITU-T Recommendations. This Amendment updates Recommendation ITU-T G.7721 to align the UML information model with the latest editions of the PTP Telecom Profiles and SyncPhy ITU-T Recommendations (i.e., ITU-T G.8275 (2026), ITU-T G.8275.1 (2026), ITU-T G.8275.2 (2026), and ITU-T G.781 (2026)).