Optically restorable WDM ring network using simple add/drop circuitry
US5625478A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1995 |
| Grant date | Apr 29, 1997 |
| Priority date | — |
| Expiry date | Sep 14, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2012/5612
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A parallel ring network is restorable upon sensing a failure of a transmission media. A central transmitter is coupled to one end of a first transmission medium. A central receiver is coupled to one end of a second transmission medium. A central sensor senses a transmission media failure centrally and provides a central alarm. In response to the central alarm, the central receiver is coupled to another end of the first transmission medium and the central transmitter is coupled to another end of the second transmission medium. At least one local station has a local receiver, a local transmitter, a local sensor for sensing a transmission media failure locally and providing a local alarm, and a local switch. In response to the local alarm, the local switch moves from a first position to a second position. When the local switch is in the first position, the local transmitter is coupled to the second transmission medium and the local receiver is coupled to the first transmission medium. When the local switch is in the second position, the local transmitter is coupled to the first transmission medium and the local receiver is coupled to the second transmission medium. A method for restor…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.