Digital telephone system
US5014315A · kind A · utility
8Cited by
5References
9Claims
0Family size
Inventors
Key dates
| Filing date | Jul 18, 1989 |
| Grant date | May 7, 1991 |
| Priority date | — |
| Expiry date | Jul 18, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04Q11/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A digital telephone system, having a through-switching module connected by its inputs/outputs to "1" subscriber concentration modules, each with group subscriber inputs/outputs connected via remote subscriber modules to groups of telephone sets. The telephone sets are digital telephone sets with inputs/outputs connected to individual subscriber inputs/outputs of remote subscriber modules via digital individual subscriber lines to provide transmission and reception of digitally coded information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.