With the rapid development of network technology, the timing synchronization accuracy of Ethernet is also improving. In order to adapt to the change of network technology, people have developed the NTP network time protocol to improve the timing synchronization function of all network devices. However, in some industries demanding high precision, NTP still can not satisfy each other. equipment Timing synchronization accuracy. The IEEE 1588 PTP timing system can solve the time information required by some high-precision devices and achieve time synchronization.

The IEEE 1588 standard is called "precision clock synchronization protocol standard of network measurement and control system" or "PTP" for short. The IEEE 1588 standard is to synchronize the clock of all nodes in a network by a synchronous signal periodically, and make the distributed system of the Ethernet achieve precise time synchronization. The IEEE 1588 PTP timing system can be applied to any multicast network.

IEEE 1588 divides the clock in the whole network into two kinds, the common clock and the boundary clock. Only one PTP communication port's clock is an ordinary clock. The clock with more than one PTP communication port is the boundary clock, and each PTP port provides independent PTP communication. Boundary clocks are usually used in poorly defined network devices, such as switches and routers. From the communication relation, the clock is divided into the main clock and the clock, any clock can be used as the master clock and the slave clock, and the synchronization between the clock and the master clock is ensured.

IEEE 1588 PTP timing system can realize the function of master clock and slave clock. In the synchronization process of the system, IEEE 1588 PTP provides time synchronization and time information to the time system. SYN2403 type PTP precisely receives the timestamp information from the clock to receive the SYN2401 PTP precise master clock. According to this information, the system calculates the master slave line time delay and the master slave time difference, and adjusts the local time with the time difference, so that the equipment time keeps the same frequency and phase with the main equipment time, and realizes frequency synchronization and time synchronization.

Compared with other network synchronization protocols, such as SNTP and NTP, PTP distinguishes PTP from a more secure and stable network environment, with less network and computer resources. The current version of the SYN2401 PTP precision master clock is IEEE1588-2008, PTP V2, which is mainly used in localized and networked systems, and the internal components are relatively stable. The SYN2401 PTP precision master clock uses GPS as the clock reference source, and has the nanosecond time transmission accuracy. It supports thousands of PTP from clock, output IRIG-B, 1PPS, 10MHZ, serial port and other time signals, supports end to end (end to end) or point to point (peer peer) mode, supports mode, main clock hot backup, hot switch function. The SYN2401 PTP precision master clock is widely used in industrial automation, aerospace, measuring instruments, electromechanical control, communication and other fields.

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