Apparatus and methods for providing an interface between FDDI-II rings
US5440557A · kind A · utility
5Cited by
6References
27Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 21, 1993 |
| Grant date | Aug 8, 1995 |
| Priority date | — |
| Expiry date | Dec 21, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S370/906
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
To exchange data in the same position in the hybrid ring control cycles in two FDDI-II rings, the cycles of the different rings are phase and frequency aligned. To achieve phase alignment, a hybrid multiplexer in one of the rings monitors the cycles on the other ring and starts a cycle when the hybrid multiplexer detects a starting delimiter on the other ring. In order to achieve frequency alignment, 8 KHz references produced by two hybrid multiplexers on the two respective rings are provided to a circuit that selects one of the references to determine the frequency for synchronizing cycle outputs of both hybrid multiplexers.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.