T504-PTP PCIe PTP slave clock card can be used to provide high precision time information for computer system. The card can be used as a time reference by inputting PTP, B-code or 1PPS+TOD, etc., and delivering time information or timing interrupt signals to the computer through the PCIe interface, so as to realize that the time of the computer hardware and software system can be synchronized with the time reference of the card. When a reference time source is abnormal, it can be automatically switched to other reference time sources; even if all reference time sources are cut off, the internal high-stability crystal of the board can still maintain high-precision time in a certain period of time for continuous operation, so as to continue to provide accurate time signals for the computer system, which greatly improves the product's reliability of continuous operation. In addition to providing time information to the computer through the PCIe port, the board can also output time information through the on-board output ports, such as SCSI-50 interface can output B-code time information, 1PPS+TOD time information; Gigabit Ethernet port supports PTP (1588V2) protocol transmission, as the master clock can be output to the outside of the time information, as a slave clock can be received when the time information. The biggest advantage of the product is the flexible configuration of input and output, users can set up different time signal sources according to their needs, and output all kinds of signals according to the application requirements. It can be used as a single board card or interconnected with multiple cards to form a unified time system, and has been widely used in aviation, communications, electric power, finance, security monitoring, railroad transportation, IT systems and industrial control and other fields.