Abstract: This paper introduces a new technology - WR technology (White Rabbit) which is developed on the basis of Precision Clock Synchronization Protocol (PTP). Combined with synchronoμs Ethernet and double mixing time difference method, the slave clock is dynamically calibrated by continuoμs high-precision measurement of link loop delay between this two clocks to achieve sub-nanosecond or picosecond precision synchronization of master clock and slave clock. This article first introduces the history of WR development and the main technologies contained in WR, then tells the role WR plays in some scientific fields. Finally, it proposes the future application of WR in other fields.

Key words: White Rabbit protocol, Synchronous Ethernet (SyneE), Precise Time synchronization Protocol (PTP)