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Method for realizing accurate time tick of Ethernet

An Ethernet, accurate technology, applied in the direction of time division multiplexing system, electrical components, multiplexing communication, etc., can solve the problems of error, delay estimation, etc., to ensure accuracy and synchronization, easy to implement, The effect of easy installation

Active Publication Date: 2011-01-19
STATE GRID ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Time synchronization through network messages, because there is a delay in the processing, sending and receiving of network messages, especially through devices such as switches and routers, the delay is not easy to estimate, and it is entirely possible to generate millisecond-level errors

Method used

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  • Method for realizing accurate time tick of Ethernet
  • Method for realizing accurate time tick of Ethernet
  • Method for realizing accurate time tick of Ethernet

Examples

Experimental program
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Embodiment Construction

[0010] A new type of device that realizes the precise time synchronization function of the Ethernet network. It is characterized in that it consists of a time synchronization device (D1), and the time synchronization device (D2) is the network device that receives the time synchronization, and the number of devices that receive the time synchronization can be greater than 1 .

[0011] The working principle and process of the present invention are as follows:

[0012] First, only use the network time synchronization message to perform time synchronization and estimate the time synchronization error. The network device used in this example is INTEL's network processor IXP465, and the operating system is Vxworks. Under the Vxworks system, the client / server communication mode based on UDP protocol is established by using the network socket. Since UDP is a connectionless protocol, the timing sender does not know whether the sent message has arrived at the receiver correctly, so a...

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Abstract

The invention discloses a method for realizing the accurate time tick of an Ethernet. The method comprises the following steps that: a central processing unit (CPU) of a time tick device D1 immediately sends an auxiliary time tick signal through a general purpose input / output (GPIO) after reading a real-time clock t1 and the level is changed only once; then the read clock information is assembled to be a network message and the network message is sent to a reception time tick device through a physical layer interface; the reception time tick device D2 also receives the signal change through a GPIO signal, records the time and marks the time as t2; the reception time tick device receives a network time tick message and sends the network time tick message to the CPU of the reception time tick device D2 for processing; and the CPU of the reception time tick device D2 analyzes the message and then exacts time information, records the time before writing into the chip of the real-time clock and marks the time as t3, wherein the period from t3 to t2 is used as network delay and the delay of message processing of the CPU of the reception time tick device D2 and is used for correcting time information. The method has the advantage that the device is easy to implement and convenient to install.

Description

technical field [0001] The invention relates to a time synchronization method, in particular to a method for realizing precise time synchronization of Ethernet. Used for network time synchronization. Background technique [0002] With the rapid development of computer and network communication technology, the era of digitization and networking of automation systems in all walks of life has come. Computers and network equipment provide a better platform for data exchange, analysis and application between various control and information systems, thus putting forward higher requirements for the accuracy of time stamps of various real-time and historical data. However, the network Each of these devices in the network runs its own time, and the time of the entire system is chaotic over time, resulting in the failure of normal data statistics and analysis services. At this time, it is necessary to synchronize the time of the entire network. [0003] Generally, an accurate networ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
Inventor 邓路马新平田小锋孙军陵
Owner STATE GRID ELECTRIC POWER RES INST
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