Ensembling Primary Reference Clocks in a Network: cnPRTC

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This paper introduces the coherent network primary reference time clock (cnPRTC) a topic recently taken up by Q13/SG15, the synchronization expert group at the ITU-T.  The coherent network PRTC connects primary reference clocks at the highest core or regional network level.  This provides the ability to maintain network-wide ePRTC time accuracy, even during periods of regional or network-wide GNSS loss.  Central to the cnPRTC is the ensembling function, comprised of (1) an agreement algorithm, (2) a timescale algorithm, and (3) a coordination function, which will be the focus of this paper

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