Method and apparatus for a redundant clock
US6839391B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 8, 2002 |
| Grant date | Jan 4, 2005 |
| Priority date | — |
| Expiry date | Sep 23, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L7/07
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A redundant clock system and communications cards for utilizing the system, the system including a clock source for providing a reference signal for communication cards; an alternate clock source, coupled to the clock source, for providing an alternate reference signal for the communication cards; each of the communication cards including a clock generator, referenced to one of the reference signals for providing clock signals at frequencies corresponding to functions provided by each of the communications cards, and each of the communication cards arranged to couple to a surviving one of the reference signals when a failure of the other is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.