With the continuous progress and development of network technology, the NTP network time protocol has been unable to meet the precision requirements of some precision devices and instruments. At this time, PTP protocol with higher accuracy is needed. PTP protocol is a precise clock protocol applied to distributed measurement and control system. PTP timing module from clock is to meet the time unification in distributed system. Its product SYN2407 PTP synchronous clock card, which is widely used in measurement and control systems, such as in industrial automation, measuring instruments, electromechanical control, communication and other fields.

I. PTP precise time protocol

IEEE 1588 referred to as (PTP, picture transfer protocol) is a standardized precise time protocol. It defines an accurate clock synchronization protocol in the measurement and control system, which is related to network communication, local computation and allocation of objects. This protocol is applicable to any distributed control system that satisfies multi point letters, and can achieve substandard synchronization for the terminals using multicast technology terminals and achieve higher accuracy. The core of the protocol is how to choose the best master clock in the same network and how the clock from the network keeps pace with the master clock.

Two, working principle

PTP clock can realize the function of master clock and slave clock, but there is only one master clock in a PTP communication subnet. In the synchronization process of the system, the PTP master clock provides time synchronization and time information, and receives the timestamp information sent from the master clock from the clock. The system calculates the time delay and the master slave time difference based on this information, and adjusts the local time with this time difference, so that the equipment time keeps the same frequency and phase with the master equipment time, and achieves frequency synchronization and time synchronization.

Three, product introduction

At present, there are many PTP clock products in China, some PTP clock products are acting abroad, and some PTP clock technology is not mature, so customers will have problems such as expensive price, inconvenient after-sale and immature technology. Xi'an synchronous Electronic Technology Co., Ltd. independently developed and produced SYN2407 PTP synchronous clock card. The PTP can be equipped with PTP main equipment and ordinary switch from the clock module as a set of precise time synchronization system. The PTP can use serial ports or network ports or UDP to configure corresponding parameters from the clock module, and provide serial ports and 1PPS as time reference signals, provide P2P and E2E mode, support PTPv2, IEEE STD 1588V2-2008 network time protocol, and support HTTP/UDP.

Four, manufacturer's introduction

Xi'an synchronous Electronic Technology Co., Ltd. is a comprehensive high-tech company integrating R & D, production, sales and service. It has 10 years of experience in R & D and production, and has the advantages of stable performance, high time service accuracy, high cost performance, wide application and low after sale rate. It provides customers with one-stop professional time-frequency synchronization solution.

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