Abstract
The network delay is one of the essential elements for the Quality of Service (QoS). The time delay is measured by placing devices at both ends of the network and using the machine’s internal time clock. The accuracy of the measurement is dependent on the precision of the clock, therefore the precision of the clock is very important. Network Time Protocol (NTP) is applied for the time synchronization among network nodes; hence, the time accuracy at each NTP server is considered very important. Moreover, the improvement of the accuracy is required for the recent broadband network.
Our objective in this research is to improve the time stability of the top NTP server (stratum1) by developing a server with higher stability. The server, which is called the high-accurate time server, was designed based on external high accurate frequency signal, instead of the crystal oscillator on the motherboard of a Personal Computer (PC). The high-accurate time server is capable of the time stability of several hundred nanoseconds. Also evaluated in this paper is the high precision measurement of network delay, which was proceeded with the server.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
Similar content being viewed by others
References
D. L. Mills, Network Time Protocol (Version 3) Specification, Implementation, RFC 1305, March. 1992.
Trimble Navigation Ltd.: Acutime 2000 and Palisade Smart Antenna GPS receiver, ftp://ftp.trimble.com/pub/ntp/palisadedrv/driver29.html
Internet Multifeed Co.: Experimental NTP Servers (Stratum2), http://www.jst.mfeed.ad.jp/
T. Nakashima and S. Ihara, An Experimental Evaluation of the Total Cost of NTP Topology, ICOIN15, January. 2001.
H. Okazawa, Y. Kitaguchi, A. Machizawa, S. Nakagawa, T. Asami and A. Ito, Advanced NTP Synchronization Device for Internet Monitoring Tools, INET2001 Posters, June. 2001.
J. Mogul, D. Mills, J. Brittenson, J. Stone and U. Windl, Pulse-Per-Second API for UNIX-like Operating Systems, Version 1.0, RFC2783, March. 2000.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2002 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Kitaguchi, Y., Okazawa, H., Shinomiya, S., Kidawara, Y., Hakozaki, K., Nakagawa, Si. (2002). Development of a High-Accurate Time Server for Measurements of the Internet. In: Chong, I. (eds) Information Networking: Wireless Communications Technologies and Network Applications. ICOIN 2002. Lecture Notes in Computer Science, vol 2344. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45801-8_34
Download citation
DOI: https://doi.org/10.1007/3-540-45801-8_34
Published:
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-44255-4
Online ISBN: 978-3-540-45801-2
eBook Packages: Springer Book Archive