ITU-T G.781.1 PDF

This Recommendation specifies a functional architecture model and corresponding atomic functions for the transport of time and frequency synchronization via packet-based methods using [ITU-T G.8275.1] and [ITU-T G.8275.2]. The specification related to the transport of frequency synchronization via packet-based methods using [ITU-T G.8265.1] is for further study. The functional architecture contains the following synchronization layers: the network synchronization packet (NS-p) layer, the synchronization distribution packet (SD-p) layer, and the SD-t for the synchronization distribution of time information (e.g., via 1PPS+ToD). In addition, some of the synchronization-related atomic functions defined in this Recommendation are part of the transport layer.

The atomic functions specified in this Recommendation can be combined in accordance with the functional architecture model to describe the time and frequency synchronization transport functionality of network equipment.