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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

Inactive Publication Date: 2009-12-09
SHANGHAI ELECTRICAL APPLIANCES RES INSTGROUP
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Problems solved by technology

None of these methods solves the error caused by the uncertainty of the communication protocol stack software in the execution process

Method used

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  • Method for enhancing synchronization accuracy of network equipment of industrial Ethernet
  • Method for enhancing synchronization accuracy of network equipment of industrial Ethernet

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Embodiment Construction

[0025] refer to figure 1 , this is the disturbance problem that the method of the present invention produces for the uncertainty of communication protocol stack software in the process of execution, and its method comprises the following steps:

[0026] Step 1, automatically perform phase alignment when the device is powered on;

[0027] Step 2, simultaneously receive the synchronization message and the second pulse signal of the time server;

[0028] The 3rd step, compare the time of local time and time server, if time difference is bigger (greater than or equal to 1 second), then directly the time in the time message that receives is set to local time;

[0029] If the time difference is not large (less than 1 second), the received second pulse signal is used as an input event of the network device, and the local time of this event is recorded, then the difference between the recorded time of less than 1 second and 1 second is The time offset between the local device and th...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L7/00
Inventor 刘健杨帆邱浩薛吉
Owner SHANGHAI ELECTRICAL APPLIANCES RES INSTGROUP
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