With the development of science and technology, more and more communications and networks have used distributed systems. This requires a standard protocol to achieve mutual cooperation. With the increasing demand for time accuracy and portability of time service equipment in various industries, the NTP protocol has already failed to meet the needs of some customers. This requires a precise PTP time protocol, which can be used in Ethernet or the sensors and actuators of the distributed bus system using multicast technology, as well as the microsecond time precision equipment.

The PTP time protocol is also called the 1588 protocol. The 1588 protocol is the precision clock synchronization protocol standard of the network measurement and control system. The basic function is to keep the most accurate clock in the distributed network synchronized with other clocks. The 1588 is a clock synchronization system based on the combination of master clock and clock. 1588 during the time service, the main clock releases PTP time synchronization and time information. The time stamp information transmitted by the master clock is received from the clock. The system calculates the time delay and master slave time difference based on this information, and then modifies local time according to the time difference, so that the equipment time is kept with the master. The frequency and phase of device time consistency.

With the improvement and progress of the PTP timing system, this kind of clock synchronization system, which is used in combination with master clock and clock, is also widely used. In some industries, it has replaced the NTP network timing system. The NTP network timing system receives the satellite information and performs the timing synchronization method with the output signal of the NTP network protocol. The timing accuracy is milliseconds, and the timing protocol is different. So the PTP is selected for customer demand. At present, our company develops and produces PTP timing products. PTP main clock, PTP clock, PTP timing clock card, PTP master clock module, PTP from clock module, the product can be applied to mobile base station, smart grid, industrial automation, aerospace, CMMB base station, telecommunications and other industries.

During the use of PTP time service system, there are also some customers who integrate the PTP module or PTP card into the device because of the appearance condition of their own equipment, so as to realize PTP time service. The PTP timing module SYN2407E IEEE1588 main clock module adopts master-slave clock mode. It can use the network symmetry and delay measurement technology to achieve master slave time, frequency and phase synchronization. The PTP main clock module has a high precision temperature compensation crystal oscillator, and can also receive external reference clock signals. The accuracy of time synchronization can reach 30 ns. PTP timing card SYN2407PTP synchronous clock time card, set up the main clock can receive GPS or Beidou clock equipment sent time reference information, support a number of PTP from the clock, provide sub microsecond time service, accuracy up to 30 nanoseconds, can be embedded in the device, to achieve PTP high precision time service system.

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