Alignment of clocks over multiple packet networks
US7376156B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2004 |
| Grant date | May 20, 2008 |
| Priority date | — |
| Expiry date | May 14, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/0664
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Disclosed is a method of aligning clocks over multiple networks having different clock domains. The method comprises transmitting timestamped packets over said networks between source and destination nodes, said timestamped packets conveying timing information based on a source clock at said source node, determining the expected delay over multiple nodes for a given traffic density, identifying at least one intermediate node between said source and destination node where said determined expected delay is such as to permit clock restoration within predefined acceptable parameters, restoring said source clock at said at least one intermediate restoration node to generate a restored intermediate clock signal, producing from said restored intermediate clock signal new timestamped packets conveying timing information based on said restored intermediate clock signal, and forwarding said new timestamped packets to said destination node.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.