An NTP Stratum-One Server Farm Fed by IEEE-1588

Richard E. Schmidt and Blair Fonville

Abstract:	For the past 16 years, USNO’s Network Time Protocol (NTP) stratum-1 servers have been synchronized to its Master Clocks via IRIG-B time code on a lowfrequency RF distribution system. The availability of Precise Time Protocol (PTP, IEEE-1588) host-based interfaces will enable the deployment of NTP servers fed by IEEE-1588 over conventional Ethernet networks. This paper describes a PTP GrandMaster/Slave network which maintains synchronization of internal (stratum-0) NTP reference clocks to within tens of nanoseconds. The configuration of a PTP network and the effects of various PTP configuration options are demonstrated.
Published in:	Proceedings of the 42nd Annual Precise Time and Time Interval Systems and Applications Meeting November 15 - 18, 2010 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	111 - 126
Cite this article:	Schmidt, Richard E., Fonville, Blair, "An NTP Stratum-One Server Farm Fed by IEEE-1588," Proceedings of the 42nd Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, November 2010, pp. 111-126.
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