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A Hardware Time Stamping Method for PTP Messages Based on Linux system

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Author(s): Zhi Li | Zhen-lin Zhong | Wang-chun Zhu | Bin-yi Qin

Journal: TELKOMNIKA : Indonesian Journal of Electrical Engineering
ISSN 2302-4046

Volume: 11;
Issue: 9;
Date: 2013;
Original page

Keywords: PTP | IEEE 1588 | SO_TIMESTAMPING | hardware timestamp | synchronization

ABSTRACT
In order to achieve high-precision clock synchronization among instrument nodes in distributed LXI bus test systems. A Hardware time stamping method for PTP messages is introduced in this paper. It is implemented in Linux systems, which runs on ARM9 S3C2440 processor. The special PHYTER DP83640 is used to mark the time of PTP messages in physical layer. The new socket option SO_TIMESTAMPING is used to obtain the hardware timestamps in user space programming. A clock synchronization test has been done after transplanting the open source protocol software PTPd on this platform. The results indicate that this method is feasible. It is able to achieve nanosecond level clock synchronization accuracy.  
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