IEEE1588 clock synchronization system and its realization method

Abstract

The invention relates to the technical field of network information transmission, and relates to an IEEE1588 clock synchronization system and an implementation method therefor. A CPU control module is connected with an Ethernet MAC (media access control) controller module, and is used for controlling the system and achieving PTP protocol and clock synchronization. The Ethernet MAC controller module is used for achieving the transmitting and receiving of PTP messages. A GPS module is connected with a local clock module, and provides a precise time reference for the system. The local clock module is connected with the CPU control module, and is used for providing a local clock reference during the message transmission. A physical layer (PHY) transceiver with a function of timestamp management is connected with the Ethernet MAC controller module through an independent media interface, thereby completing the stamping and obtaining of a timestamp, and enabling the time information to be embedded into the messages, and completing the transmission of a data package with the timestamp according to the IEEE 802.3 standard.

Description

technical field [0001] The invention belongs to the technical field of network information transmission, and relates to an IEEE1588 clock synchronization system and a realization method thereof. Background technique [0002] At present, with the rapid development of Ethernet technology, modern industry has higher and higher requirements for clock synchronization accuracy. Due to limitations in existing clock synchronization methods, time synchronization methods that achieve high precision, high reliability, and low cost have attracted widespread attention. [0003] Synchronization protocols commonly used in Ethernet include: Network Time Protocol NTP (Network Time Protocol) and its simple version SNTP (Simple Network Time Protocol). The purpose of the NTP / SNTP protocol is to synchronize the time of the computer to certain time standards. The server / client mode is used for time synchronization at the application layer. The synchronization accuracy is not high, generally betw...

AI Technical Summary

Problems solved by technology

[0006] Although the above technology uses hardware to realize clock synchronization, because the implementation method is only to periodically correct the slave device, the offset of the master-slave device at the moment of correction is zero, and the frequency is not compensated, resulting in the change of the master device over time. The clock deviation between slave devices gradually increases. This kind of time drift produces a large time deviation, which is not allowed in the case of high-precision time synchronization.

Images