Setting Up an NTP Server at the Royal Observatory of Belgium

Fabian Roosbeek, Pascale Defraigne, André Somerhausen

Abstract:	This paper describes the setup of an NTP server for time synchronization via the Internet at the Royal Observatory of Belgium. The time server is realized by a “heartbeat” system of two PC servers connected to an NTS-3000 time server synchronized on three different sources: (1) UTC (ORB), our national time scale; (2) UTC broadcast by GPS satellite system; and (3) DCF-77 System. The precision of the synchronization between our time server and the different time sources is a few microseconds. A remote synchronization on our server, using the NTP protocol, is directly traceable to UTC with an utmost precision of a few milliseconds when the synchronization is done under optimal conditions.
Published in:	Proceedings of the 36th Annual Precise Time and Time Interval Systems and Applications Meeting December 7 - 9, 2004 Hyatt Regency Washington on Capitol Hill Washington, D.C.
Pages:	237 - 246
Cite this article:	Roosbeek, Fabian, Defraigne, Pascale, Somerhausen, André, "Setting Up an NTP Server at the Royal Observatory of Belgium," Proceedings of the 36th Annual Precise Time and Time Interval Systems and Applications Meeting, Washington, D.C., December 2004, pp. 237-246.
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