WANG Kang1,2,3, HU Yong-hui1,2, HE Zai-min1,2,3

(1. National Time Service Centre, Chinese Academy of Sciences, Xi’an 710600, China;

2. Key Laboratory for Precision Navigation and Timing Technology, National Time Service Centre,

Chinese Academy of Sciences, Xi’an 710600, China;

3. Graduate University of Chinese Academy of Sciences, Beijing 100039, China)

Abstract: Along with extensive application of precise time synchronization, it has become an ideal way to adopt hardware-assisted IEEE1588 protocol for reducing synchronous error and improving synchronous precision. The functional structure of physical layer chip DP83640 and the basic synchronous principle for IEEE1588 protocol are analyzed in this paper. A time synchronous module with DP83640 as a major component has been constructed, and the synchronous process has been tested and verified. The experiments and analyses show that the synchronous precision for the IEEE1588 protocol assisted with DP83640 achieves the level ofnanosecond.

Key words: IEEE1588; DP83640; time synchronous; timestamp