Communications system and method for bi-directional communications between an upstream control facility and downstream user terminals
US5421030A · kind A · utility
182Cited by
53References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 17, 1991 |
| Grant date | May 30, 1995 |
| Priority date | — |
| Expiry date | Sep 17, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W88/085
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Cordless telephones generate cell relay packets. Packets from each cordless telephone are polled by an upstream polling unit avoiding multi-unit interference. Cell packets are transmitted via a cable TV system. Radiated frequencies of the cordless telephones are shifted in frequency as they enter or leave the TV feeder cable to allow frequency reuse. The upstream polling unit appends header information on the cell packets and converts them into standard SONET ATM protocol packets. The cell relay packets are switched by a cell relay type switch to create a cost-effective, alternative telephone system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.