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T. Neagoe, V. Cristea, L. Banica. NTP versus PTP in Computer Networks Clock Synchronization. In The 2006 IEEE International Symposium on Industrial Electronics (ISIE2006), Montreal, Vol.1, pp. pp. 317-32. IEEE, Proceedings of the 2006 IEEE International Symposium on Industrial Electronics (ISIE2006), ISBN 1-4244-0497-5, 2006.

Abstract: Trusted and precise time sources are required in computer networks and Internet for various reasons: time stamps for electronic documents, online transactions, storage and document retrieval, electronic mail, multimedia applications and many others. Also, the demand for Ethernet as a real-time control network is increasing, as manufacturers realize the benefits of employing a single network technology across the plant. For control and measurement applications, the need of an accurate distribution-wide sense of time is even more stringent than regular applications. This paper is comparing two clock synchronization protocols, the Network Time Protocol and the IEEE-1588 Precision Time Protocol. It gives an overview of synchronization methods by the time stamping employed in IP-based real-time applications looking at the possible sources of errors as well as the achievable performance of the two standards.

Keywords: Clock synchronization, time distribution, protocol,1588 Implementations

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