Time synchronization method and clock device

A technology of time synchronization and clock, which is applied in the field of network communication, can solve the problems of unusable, reduced accuracy, and inability to obtain accuracy, and achieve the effect of small error accumulation and improved accuracy

Active Publication Date: 2011-09-21
NEW H3C TECH CO LTD
View PDF4 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For C3, the time synchronization path is from C2 to C1, and then from C1 to C3, which requires two time corrections. For the better path C2 to C3, it cannot be used due to the limitation of blocking port P1.
As the numb...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Time synchronization method and clock device
  • Time synchronization method and clock device
  • Time synchronization method and clock device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] In the prior art, the clock device directly discards the PTP synchronization message received through the blocked port. The core idea of ​​the present invention is to make the blocked port no longer restrict the PTP synchronization message. The received PTP synchronization message also participates in the local clock correction. The main method provided by the present invention can be as figure 2 As shown, it mainly includes the following steps:

[0029] Step 201: After receiving a PTP synchronization message from a (slave) port or a blocked port, the clock device obtains the hop count from the PTP synchronization message to the root node of the PTP synchronization spanning tree.

[0030] There is a field StepsRemoved in the PTP synchron...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a time synchronization method and a clock device, the limitation of a block port on a precision time protocol (PTP) synchronization message is cancelled, a local clock is amended according to the PTP synchronization message transmitted from an optimal path, as the hop count of routing of the PTP synchronization message is minimal, the cumulative error is also minimal and the time synchronization precision is further improved. Furthermore, when the PTP synchronization message is received through a slave port and the clock device has a master port, after clock information carried in the PTP message is amended, the master port is used for forwarding the PTP synchronization message so as to enable the follow-up clock device to conveniently perform precision time synchronization.

Description

technical field [0001] The invention relates to the technical field of network communication, in particular to a time synchronization method and a clock device. Background technique [0002] The IEEE1588 protocol is a relatively accurate clock synchronization solution in Ethernet, and its basic function is to keep other clocks in the distributed network synchronized with the most accurate clock. A precision time protocol (PTP, Precision Time Protocol) is defined in the IEEE1588 protocol, which is used to accurately synchronize the clocks of network nodes in standard Ethernet or other distributed bus systems using multicast technology, and its precision can reach nanometers. second level. [0003] In the network, the clock priority is usually set for each clock device, and each clock device sends an Announce message carrying its own clock priority in the network to elect the clock device with the highest clock priority, which has the highest clock priority The clock device ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H04L7/00
Inventor 徐鹏飞
Owner NEW H3C TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap