Network Time Synchronization Servers at the U. S. Naval Observatory

R. E. Schmidt

Abstract:	Responding to an increased demand for reliable, accurate time on the Internet and Milnet, the U.S. Naval Observatory Time Service has established the network time sewers, tick.usno.navy.mil and tock.usno.navy.miL The system clocks of these HP9000/747i industrial work stations are synchronized to within a few tens of microseconds of USNO Master Clock 2 using VMEbus IRIG-B interfaces. Redundant time code is available from a VMEbus GPS receiver. UTC(USNO) is provided over the network via a number of protocols, including the Network Time Protocol (NTP) [DARPA Network Working Group Report RFC-1305], the Daytime Protocol [RFC-867], and the Time protocol [HFC-868]. Access to USNO network time services is presently open and unrestricted. An overview of USNO time services and results of LAN and WAN time synchronization tests will be presented.
Published in:	Proceedings of the 26th Annual Precise Time and Time Interval Systems and Applications Meeting December 6 - 8, 1994 Hyatt Regency Reston Town Center Reston, Virginia
Pages:	175 - 184
Cite this article:	Schmidt, R. E., "Network Time Synchronization Servers at the U. S. Naval Observatory," Proceedings of the 26th Annual Precise Time and Time Interval Systems and Applications Meeting, Reston, Virginia, December 1994, pp. 175-184.
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