Automatic correction method for switch clock

An automatic deviation correction and switch technology, which is applied in the direction of data exchange network, digital transmission system, electrical components, etc., can solve the problems of network clock verification dependence, and does not support mutual calibration of network equipment, etc., to achieve good flexibility effect

Active Publication Date: 2017-05-31
天津卓越信通科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the network clock verification depends on the clock of the master station, and the slave station receives the clock passively, and does not support mutual calibration between network devices

Method used

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  • Automatic correction method for switch clock
  • Automatic correction method for switch clock
  • Automatic correction method for switch clock

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Embodiment Construction

[0026] The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the exemplary embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0027] like Figure 1-3 As shown, in this embodiment, 10 switches are used to form a ring network, and each switch is set to send ring network time measurement messages in turn, and record the message origination time. The TTL (time to live) initial value of the message is 255, TTL is a time-to-live value for ordinary IP packets. When the packet passes through a switch to perform three-layer forwarding, the TTL value will be reduced by 1. When the TTL value is reduced to 1, the packet will no l...

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Abstract

The invention discloses an automatic correction method for a switch clock. The automatic correction method is as follows: with the help of good time delay characteristics of a universal switching chip, a virtual time Ta (the total rounding time) is constructed in a practical network environment; any equipment on a network can obtain the same virtual time Ta by replication through the same means; each equipment measures the virtual time Ta through respective crystal oscillators; then, measurement results can be summarized; therefore, the crystal oscillation deviation condition of each equipment can be analyzed and compared; and the crystal oscillation compensation can be corrected according to the predetermined standard. By means of the manner, the crystal oscillation calibration precision can be increased from + / -50 ppm to + / -5 ppm without extra hardware improvement; implementation can be carried out through software configuration in a production stage or an application field; and thus, the automatic correction method has good flexibility.

Description

technical field [0001] The invention relates to the field of switch clock calibration, in particular to an automatic correction method for switch clocks. Background technique [0002] The switch is a high-speed communication device that requires high clock accuracy. The crystal oscillator used in production has a direct impact on the clock accuracy of the device. Direct measurement of the deviation of the crystal oscillator requires professional equipment, high operating costs, and inconvenient implementation on the production site. [0003] The invention patent with the application number 200910061657.8 discloses a time synchronization method of field bus, including the implementation process of the master station and the implementation process of the slave station. In each communication cycle, the master station sends the difference between the frame sending time and frame receiving time in the previous cycle and the sending time of this data frame to the ring network. Ea...

Claims

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Application Information

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IPC IPC(8): H04L7/00H04L12/931
CPCH04L7/00H04L7/0012H04L49/00H04L49/557
Inventor 吕金泉杨国文
Owner 天津卓越信通科技有限公司
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