An Analysis of Performance Statistics Reported by the NTPv4 Reference Implementation and Their Effect on Calibration Uncertainty - (ppt)

摘要

When measuring clock offsets of DUT's on local networks (i.e., LAN) with low delays, we have to pay special attention to small effects on network delay and offset measurement reported by the NTP implementation on the Calibrator. Sensitivity to configuration changes observed in NTPv4 otherwise negligible now become significant in the uncertainty budget; Can we lower the uncertainty?