Title: Challenges in Time Transfer using the Network Time Protocol (NTP)
Author(s): Steven E. Sommars
Published in: Proceedings of the 48th Annual Precise Time and Time Interval Systems and Applications Meeting
January 30 - 1, 2017
Hyatt Regency Monterey
Monterey, California
Pages: 271 - 290
Cite this article: Sommars, Steven E., "Challenges in Time Transfer using the Network Time Protocol (NTP)," Proceedings of the 48th Annual Precise Time and Time Interval Systems and Applications Meeting, Monterey, California, January 2017, pp. 271-290.
Full Paper: ION Members/Non-Members: 1 Download Credit
Sign In
Abstract: Successful time transfer between a network time protocol (NTP) server and client relies on symmetric network delays and accurate, well-behaved NTP servers. NTP network delays and stratum 1 server performance were monitored for several years from multiple clients located in the United States. Several patterns of asymmetric delay and loss were identified, some pathological. Significant time offsets and other errors were seen in a few NTP stratum 1 servers, including some hosted by national agencies. IoT implications are briefly discussed.