NETWORK TIME PROTOCOL PRECISION TIMESTAMPING SERVI

专利名称：NETWORK TIME PROTOCOL PRECISION

TIMESTAMPING SERVICE

发明人：DOWD, GREGORY, LOUIS申请号：EP078115申请日：20070516公开号：EP2025104A4公开日：20130403

摘要：Embodiments of the present invention set forth a method and system forreducing uncertainty in receive and transmit timestamps created by an NTP server. Theuncertainty in the receive timestamps is removed by recording the time-of-arrival in thehardware clock of the NTP server before the incoming packets may be delayed bytraversing the various layers of software in a timestamping system. The uncertainty in thetransmit timestamps is removed by giving the outgoing packets a timestamp in thefuture using an estimate of the transmission latency calculated by the latency estimatorfilter. Subsequently, the actual time-of-departure is used to re-calculate and update theestimate of the transmission latency. In this fashion, superior control of the timestampingfunction may be implemented in existing NTP servers in a manner that retainsinterworking compatibility with the current NTP standards.

申请人：SYMMETRICOM, INC.

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