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 edition of the Recommendation defines the PTP profile for unicast mode only. Future editions of the Recommendation will contain a separate profile for a mixed unicast/multicast case.