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http://dx.doi.org/10.5302/J.ICROS.2014.14.0025

Evaluation of Synchronization Performance with PTP  

Lee, Young-Kyu (Division of Physical Metrology, Korea Research Institute of Science and Technology)
Yang, Sung-Hoon (Division of Physical Metrology, Korea Research Institute of Science and Technology)
Lee, Chang-Bok (Division of Physical Metrology, Korea Research Institute of Science and Technology)
Lee, Jong-Goo (Division of Physical Metrology, Korea Research Institute of Science and Technology)
Park, Young-Mi (The 2nd R&D Institute, Agency for Defense Development)
Lee, Moon-Seok (Electronic Warfare R&D Lab., LIGNex1)
Publication Information
Journal of Institute of Control, Robotics and Systems / v.20, no.6, 2014 , pp. 669-675 More about this Journal
Abstract
In this paper, we described the investigated theoretical time synchronization performances and experiment results obtained by commercially provided PTP (Precise Time Protocol) modules when the time of a slave clock is synchronized to the master clock. In the case of the theoretical performance analysis, we investigated 3 types of clock levels such as Crystal Oscillator (XO), TCXO (Temperature Compensated XO) and OCXO (Oven Controlled XO). From the analysis, it was observed that the synchronization performance is greatly influenced by the synchronization period and the required performance under 1 us can be achieved by using XO level clocks when the synchronization period is less than 2 seconds and the uncertainty of the propagation delay is under 100 ns. For the experiments using commercial PTP modules, the synchronization performance was investigated for direct, through 1 hub and through 2 hubs connections between the master clock and the slave clock. From the experiment results, we observed that time synchronization under 90 ns with 1,000 seconds observation interval can be achieved in the case of direct connection.
Keywords
ethernet; IEEE1588; PTP; time synchronization; MTIE;
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  • Reference
1 S. Bregni, "Measurement of maximum time interval error for telecommunications clock stability characterization," IEEE Transactions on Instrumentation and Measurement, vol. 7, no. 5, pp. 900-906, 1996.
2 Z. R. Smith and C. S. Wells, "Central limit theorem and sample size," Annual Meeting of the Northeastern Educational Research Association, Oct. 2006.
3 C. Gordon, Introduction to IEEE 1588 & Transparent Clocks, White Paper, Tekron, 2009.
4 S. Balasubramanian, K. R. Harris, and A. Moldovansky, "A frequency compensated clock for precision synchronization using IEEE 1588 protocol and its application to ethernet," Proc. of the Workshop on IEEE 1588, pp. 91-94, Sep. 2003.
5 B. Iglewicz and D. Hoaglin, "How to detect and handle outliers," ASQC Basic References in Quality Control: Statistical Techniques, vol. 16, pp. 10-13, 1993.
6 IEEE Instrumentation and Measurement Society, IEEE Standard for a Precision Clock Synchronization Protocol for Networked Measurement and Control Systems, IEEE std 1588-2008.
7 http://IEEE1588.nist.gov
8 M. Princ, IEEE 1588 Implementation on a ColdFire Processor, Application Note, AN3625, 2008.
9 M. Horauer, K. Schossmaier, U. Schmid, R. Holler, and N. Kero, "PSynUTC-evaluation of a high-precision time synchronization prototype system or ethernet LANs," Proc. of the 34th Annual Precise Time and Time Interval (PTTI) Meeting, pp. 263-277, Dec. 2002.
10 Institute of Computer Technology, "Embedded SynUTC and IEEE 1588 clock synchronization for industrial ethernet," First Workshop on IEEE-1588 Standard, pp. 26-37, Sep. 2003.
11 H. Weibel, "IEEE 1588 tutorial," IEEE 1588 Conf., Oct. 2006.
12 http://en.wikipedia.org/wiki/Measurement_uncertainty
13 http://en.wikipedia.org/wiki/Central_limit_theorem