Summary

Recommendation ITU-T G.8265/Y.1365 describes the architecture and requirements for packet‑based frequency distribution in telecom networks. Examples of packet-based frequency distribution include the network time protocol (NTP), IEEE-1588-2008 and IEEE 1588-2019 and are briefly described here. Details necessary to utilize IEEE-1588-2008 and IEEE 588-2019 in a manner consistent with the architecture are defined in other Recommendations.

Amendment 1 includes the following changes:

–           IPv6 mapping, in addition to IPv4, is now mandatory;

–           Clarifying notes have been added to the tables in Annex A which contains the PTP profile.

–           Provides carifications to PTP attribute values.