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Method for precise time synchronization

A precise synchronization and time technology, applied in the field of network communication, can solve problems that cannot be applied to distributed systems

Active Publication Date: 2014-04-30
杭州联汇科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention mainly solves the technical problems existing in the prior art that cannot be applied to distributed systems, and provides a precise time synchronization method that does not require a special time server and can be applied to distributed systems

Method used

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Embodiment

[0037] Example: figure 1It is a schematic block diagram of the system of the present invention, which mainly includes an MCU unit, an Ethernet interface unit and a VCXO (voltage-controlled oscillation) unit.

[0038] The MCU unit mainly implements PTP algorithm implementation and processing, the Ethernet interface unit mainly implements the MII (Media Independent Interface, Media Independent Interface) interface and control on the hardware, and the VCXO unit mainly implements clock synchronization compensation and correction functions. Among them, the MCU unit and the VCXO unit are the core units of the present invention.

[0039] The MCU unit mainly includes a media stream (Media Stream) receiving, sending and processing module, a PTP processing module, and a VCXO processing module.

[0040] The PTP processing module of the MCU unit includes a PTP server module and a media clock server module. The system block diagram is as follows: image 3 shown. The specific processing ...

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Abstract

The invention discloses a method for precise time synchronization. A time difference between a primary mode device and a secondary mode device is calculated to calculate average path delay; on the basis of the time compensation algorithm, time quantum information needing compensation adjustment currently is calculated; a time adjustment control module is used for carrying out time compensation adjustment processing on the clock secondary mode device, so that time synchronization of all devices in the whole system can be realized. According to the scheme, the special time server is not needed; and the method is suitable for a distributed system.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a method for precise time synchronization based on the IEEE802.1as protocol. Background technique [0002] The IEEE 802.1as protocol (Precision Time Protocol, PTP for short) is a precise clock synchronization protocol based on the Layer 2 network and used to precisely synchronize independent clocks in a distributed system. Therefore, it is especially suitable for the synchronization between bridge LAN nodes with high real-time requirements. [0003] IEEE 802.1as takes the Timestamping mechanism as the core, adopts the main clock selection and negotiation algorithm, path delay measurement and compensation algorithm, clock frequency matching and adjustment mechanism, and can generate clocks and repair the clocks of each network node to achieve clock synchronization the goal of. [0004] In a distributed system, the synchronization of system time is one of the most i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04J3/06
Inventor 赵凡杨孟洲
Owner 杭州联汇科技股份有限公司
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