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Development of a High-Accurate Time Server for Measurements of the Internet

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Information Networking: Wireless Communications Technologies and Network Applications (ICOIN 2002)

Part of the book series: Lecture Notes in Computer Science ((LNCS,volume 2344))

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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.

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References

  1. D. L. Mills, Network Time Protocol (Version 3) Specification, Implementation, RFC 1305, March. 1992.

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  2. Trimble Navigation Ltd.: Acutime 2000 and Palisade Smart Antenna GPS receiver, ftp://ftp.trimble.com/pub/ntp/palisadedrv/driver29.html

  3. Internet Multifeed Co.: Experimental NTP Servers (Stratum2), http://www.jst.mfeed.ad.jp/

  4. T. Nakashima and S. Ihara, An Experimental Evaluation of the Total Cost of NTP Topology, ICOIN15, January. 2001.

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  5. 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.

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  6. 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.

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© 2002 Springer-Verlag Berlin Heidelberg

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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

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  • DOI: https://doi.org/10.1007/3-540-45801-8_34

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  • Publisher Name: Springer, Berlin, Heidelberg

  • Print ISBN: 978-3-540-44255-4

  • Online ISBN: 978-3-540-45801-2

  • eBook Packages: Springer Book Archive

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