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Frequency synchronism device and method based on PTP frames

A technology of frequency synchronization and synchronization frame, which is applied in the field of communication and can solve problems such as algorithms that do not specify frequency synchronization

Active Publication Date: 2014-01-29
FENGHUO COMM SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the master-slave relationship is established, frequency synchronization must be performed, but the IEEE1588V2 protocol does not specify a frequency synchronization algorithm

Method used

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  • Frequency synchronism device and method based on PTP frames
  • Frequency synchronism device and method based on PTP frames

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Embodiment Construction

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0035] see figure 1 As shown, the embodiment of the present invention provides a PTP frame-based frequency synchronization device, including a clock unit, a MAC receiving unit, a MAC sending unit, a PTP frame processing unit, and a CPU, wherein:

[0036] The clock unit is used to: provide clocks for all functional modules, make all functional modules work normally, and correctly generate time stamps in corresponding functional modules;

[0037] The clock unit includes a clock synchronization subunit, and the clock synchronization subunit is used for processing clocks;

[0038] The clock synchronization subunit includes a second pulse receiving module, a second pulse sending module and a global clock processing module;

[0039] The pulse per second receiving module is used to: receive the PPS (1Pulse per Second, pulse per second) sig...

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Abstract

The invention discloses a frequency synchronism device and method based on PTP frames, and relates to the field of communications. The frequency synchronism device comprises a clock unit, an MAC receiving unit, an MAC sending unit, a PTP frame processing unit and a CPU. The clock unit comprises a clock synchronism subunit comprising a pulse per second receiving module, a pulse per second sending module and a global clock processing unit. The PTP frame processing unit comprises a PTP frame analysis module, a PTP frame transfer module, a PTP frame sensing module, a PTP frame receiving control module and a PTP frame sending control module. The MAC receiving unit comprises a timestamp receiving processing unit; the MAC sending unit comprises a timestamp sending processing unit. Due to the combination of hardware and software, frequency synchronism can be carried out by being completely independent of the synchronous Ethernet.

Description

technical field [0001] The invention relates to the communication field, in particular to a PTP frame-based frequency synchronization device and method. Background technique [0002] IEEE1588v2 (1588 Time Synchronization Protocol v2 version formulated by IEEE) protocol is a precise time synchronization protocol, referred to as PTP (Precision Time Protocol, Precision Time Protocol). Time synchronization between devices, IEEE1588V2 can achieve sub-microsecond time precision. The PTP protocol can run on UDP / IP or 802.3, Ethernet, DeviceNET and other protocols. The realization of the packet network time synchronization network mainly includes the following three steps: (1) Establish a master-slave relationship; (2) Frequency synchronization; (3) Time synchronization. Time synchronization is to adjust the time values ​​of clocks distributed in different places to a certain degree of accuracy or compliance through time comparison. Frequency synchronization is to adjust the freq...

Claims

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Application Information

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IPC IPC(8): H04L7/00
Inventor 张启明方继通梁元涛
Owner FENGHUO COMM SCI & TECH CO LTD
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