Switching equipment clock synchronization device and method based on as6802 standard

Abstract

The invention provides a switching equipment clock synchronization device and a method thereof based on an AS6802 standard. The device comprises a receiving first-in first-out queue FIFO module, a frame parsing module, a receiving listening module, a curing module, a compression module, a group detecting module, a clock module and a frame synthesis module. The method comprises the steps of: caching data, listening the arrival time and parsing a frame, obtaining a curing time, obtaining a compression time, detecting unity, calibrating the clock, and performing frame synthesis. The invention solves the problem that the switching equipment frequently loses synchronization in the case of some switching equipment with large clock deviations in the Ethernet so as to improve the stability of theclock synchronization of the switching equipment, and simultaneously solves the problem of spurious synchronization of the switching equipment in the case of receiving the information that the times of the switching equipment are not synchronized in the Ethernet so as to improve the reliability of the clock synchronization of the switching equipment.

Description

technical field [0001] The invention belongs to the technical field of communication, and further relates to a switching device clock synchronization device and method based on the SAE AS6802 (Society of Automotive Engineers) standard in the technical field of Ethernet. The invention performs clock calibration on switching equipment according to SAE AS6802 (Society of Automotive Engineers) standard, and is used for clock synchronization of switching equipment in Ethernet, while ensuring conflict-free synchronous communication between switching equipment. Background technique [0002] As the system becomes larger and more complex, and the degree of distribution is higher and higher, many fields have higher requirements for the real-time and certainty of the network, and the research and implementation of clock synchronization protocols are becoming more and more important. In the development history of synchronization protocols, there are mainly: Network Time Protocol NTP (Ne...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that due to the existence of some switching devices with large clock deviations in the Ethernet, the frequent out-of-synchronization of the switching devices to be synchronized makes this synchronization method unable to be used in the network scenario of time-triggered Ethernet. At the same time, since there is no clumping detection mechanism in this synchronization method, it cannot guarantee the reliability of the synchronization network

The Ethernet frame transceiver module is used for receiving and sending Ethernet frames in the device; the timestamp generation module is used for generating receiving time points in the device; the multiplexing module is used for IEEE1588 Ethernet The multiplexing of port and ordinary Ethernet port data; the demultiplexing module is used for the demultiplexing of IEEE1588 Ethernet port and ordinary Ethernet port data; the central processing module is used to calculate the Ethernet received by the device The difference between the network frame time information and the local clock, and then calibrate the local clock; the disadvantage of this device is that when the clock synchronization of the switching equipment in the Ethernet, it cannot detect the number of switching equipment in the synchronized state, and the clock synchronization of the switching equipment Anti-interference ability is not strong

The disadvantage of this method is that since this method adopts the IEEE1588 standard, this method can only be used for time synchronization of switching devices in symmetric transmission links, and is not suitable for Ethernet with asymmetric transmission links. The clock of the switching device is synchronized. At the same time, this synchronization method cannot filter the data transmitted by the switching device with a large clock deviation, so that the synchronization method cannot guarantee the stability of the clock synchronization of the switching device.

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