Mobility Investigate

The Cost of Variability

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Executive Summary

The authors explore the robustness of synchronization performed in the presence of variable latencies using two software clocks: the TSCclock, designed to replace ntpd for Internet synchronisation, and ptpd, a software implementation of IEEE- 1588. Using a precise comparison methodology the TSCclock is shown to be more accurate and far more robust. They discuss the reasons why and the implications for IEEE-1588 more generally. It is well known that variability in latencies between system components separating clock masters from slaves impacts on synchronization accuracy.

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