Recommendation ITU-T G.8275.1/Y.1369.1 contains the ITU-T precision time protocol (PTP) profile for phase and time distribution with full timing support from the network. 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. Amendment 3 provides the following updates: -G.8272.1 and G.8273.3 references added along with related supporting text -Native OTN transport added to this profile