Research on computer time synchronization

Network time server and PCI timing card are two important devices of computer time synchronization. So it is necessary to research the features of them. In this paper, the two methods which synchronize accurate time to the computer based on the two devices were described. An effective PPS measurement method which shows synchronization accuracy and delay of each was made by using the computer parallel port. By comparing the results of two methods of synchronizing time, the different delay characteristics are analyzed in windows operating system environments. A more accurate synchronization can be achieved by reducing delay which can get a better the delay characteristics and delay compensation.