Summary

Recommendation ITU-T G.8261.1/Y.1361.1 depicts synchronization aspects in packet networks. In particular, it specifies the hypothetical reference model and the PDV network limits applicable when frequency synchronization is carried via packets and is recovered according to an adaptive clock recovery method as defined in Recommendations ITU-T G.8261 and ITU‑T G.8260. It specifies the minimum equipment tolerance to packet delay variation in terms of the metrics defined in Recommendation ITU-T G.8260 at the boundary of these packet networks.