Timing distribution within a network element while supporting multiple timing domains
US7773606B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 2008 |
| Grant date | Aug 10, 2010 |
| Priority date | — |
| Expiry date | Jan 22, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/0667
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
According to one embodiment of the invention, a network element synchronizes a number of clocks within the system while supporting multiple independent timing domains. The network element includes a local clock, which is free-running and is not necessarily synchronized with an external reference, that synchronously provides a local time value to the slave and master interfaces of each timing domain. Each slave interface of each timing domain independently determines timing information based on a received master clock synchronization event and the value of the local time when that synchronization event was received. The timing information is distributed to the master interfaces of the appropriate timing domain, and each master interface calculates an adjusted synchronization event based on the received timing information and the value of the local time when that timing information was received. The adjusted synchronization events are transmitted out of the network element to an external slave interface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.