Synchronization of asynchronous data signals
US4811340A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1986 |
| Grant date | Mar 7, 1989 |
| Priority date | — |
| Expiry date | Jun 19, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04J3/076
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a synchronous network, asynchronous data signals are synchronized using positive/negative stuffing under the control of stuff request signals which are produced in dependence upon the phase difference between the asynchronous and synchronized data signals as compared to respective threshold values. The phase difference is, or the threshold values are, cyclically changed in a manner to produce additional stuffing, not necessitated by the asynchronous frequency difference, whereby the frequency of jitter, due to stuffing, in the synchronized data signal is increased. The increased frequency jitter is filtered out in an already-provided phase locked loop.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.