Method for enhancing synchronization accuracy of network equipment of industrial Ethernet

A technology of network equipment and synchronization accuracy, applied in the direction of synchronization devices, digital transmission systems, electrical components, etc., can solve problems such as unresolved errors, and achieve the effect of avoiding disturbance and high clock synchronization
CN101599962AInactive Publication Date: 2009-12-09SHANGHAI ELECTRICAL APPLIANCES RES INSTGROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI ELECTRICAL APPLIANCES RES INSTGROUP
Publication Date
2009-12-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for enhancing synchronization accuracy of network equipment of industrial Ethernet; at first, the method comprises, aiming at perturbed problem generated by uncertainness of communication protocol stack software in the process of execution, the following steps: 1, implementing phase alignment automatically upon the electrification of equipment; 2, simultaneously receiving synchronization messages and pulse-per-second signal of a time server on the network; 3, comparing local time with time of the time server; 4, judging the direction regulated by a local clock according to the received time message and the local time; 5, averagely assigning time deviation resulted from computation into synchronization intermittence; secondly, velocities of clock crystal oscillators of the equipment are deviated, and the method comprises the steps: A), setting maximal regulating amount of each synchronization intermittence upon the electrification; B), computing the regulating amount in this synchronization intermittence; C), computing regulating times in this synchronization intermittence; and D) averagely assigning the regulating amount to each regulation period.
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Description

technical field

[0001] The invention relates to a method for improving the synchronization accuracy of industrial Ethernet network equipment, belonging to the technical field of industrial Ethernet. Background technique

[0002] In all network synchronization algorithms, the impact of line delay on the synchronization system must be taken into account, so the accuracy of line delay calculation directly affects the accuracy of the synchronization system.

[0003] The line delay is mainly composed of the communication protocol stack delay and the transmission delay on the physical network. When data is communicated in a network without store-and-forward function, the line delay generated by the physical network is generally stable, while the communication The protocol stack software has great uncertainty in the process of execution, which makes the delay of the communication protocol stack produce large jitter.

[0004] In addition, due to the deviation of the clock crystal o...

Claims

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