Method and apparatus for detecting communication channel delay asymmetry
US9042412B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 31, 2009 |
| Grant date | May 26, 2015 |
| Priority date | — |
| Expiry date | Apr 16, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/0658
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The invention provides a method and apparatus for detecting communication channel delay asymmetry between transmission line protection devices. The method comprises: calculating, repeatedly, clock disparity between clocks of the protection devices and communication delays at different paths of the communication channel; comparing the latest calculated clock disparity and communication delays with previously calculated clock disparities and communication delays, respectively; determining a channel switching has happened if a change of the calculated clock disparity exceeds a first threshold, or a change of the calculated communication delays for any path exceeds a second threshold; and determining the channel delays as asymmetrical if a difference between the calculated communication delays of the different paths after the channel switching exceeds a third threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.