This Recommendation specifies a profile for telecommunication applications based on [IEEE 1588] precision time protocol (PTP). The profile specifies the IEEE 1588 functions that are necessary to ensure network element interoperability for the delivery of accurate phase/time (and frequency) synchronization. The profile is based on the use of partial timing support (PTS) or assisted partial timing support (APTS) from the network architecture as described in [ITU-T G.8275] and definitions described in [ITU‑T G.8260]. Amendment 1 to Recommendation ITU-T G.8275.2 (2022/11) provides the following updates: Added notes to clause 6.7.9 “Data set comparison algorithm” with references to [IEEE 1588] on defaultDS.timeReceiverOnly, portDS.masterOnly, and portDS.notMaster. Added a note to “Table 3 – Applicable clockClass values” on T-BC-A holdover Added performance monitoring Annex F of [ITU-T G.8275] as an optional feature of this profile Clarified defaultDS.deviceType with a note added to Table A.1 Revised terminology based on inclusive language Incremented profileVersion to 2.4 and 2.5 in clauses A.1 and A.11