Clock synchronization system, node, clock synchronization method, and program

Abstract

The invention provides a clock synchronization system which synchronizes the clock of a slave node with the clock of a master node by use of a timestamp packet transmitted from the master node to the slave node on the packet network, wherein the slave node includes a phase comparison partwhich calculates a difference between a received timestamp and a timestamp generated on the slave node side; an LPF partwhich suppresses jitters and noises contained in the difference obtained by the phase comparison part; a PI control partwhich generates a control signal configured to ultimately reduce the difference to zero; a VCO partwhich outputs a clock signal with a frequency corresponding to the generated control signal; a frequency division partwhich generates a clock signal with a frequency up-converted from the frequency of the clock signal; a timestamp generation partwhich outputs a timestamp based on the clock signal from the frequency division part; and a resolution conversion partwhich increases the resolution of the timestamp from said timestamp generation part.