This Recommendation defines frequency synchronization aspects in packet networks. It specifies the maximum network limits of jitter and wander that shall not be exceeded. It specifies the minimum equipment tolerance to jitter and wander that shall be provided at the boundary of these packet networks at TDM and synchronization interfaces. It also outlines the minimum requirements for the synchronization function of network elements.
ITU-T G.8261-2013 Referenced Document
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ITU-T G.8261-2013 history
2013ITU-T G.8261-2013 Timing and synchronization aspects in packet networks (Study Group 15)