Telephone system with controllable ringing voltage
US7046797B2 · kind B2 · utility
1Cited by
3References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2002 |
| Grant date | May 16, 2006 |
| Priority date | — |
| Expiry date | Jan 1, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02D30/70
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone system includes a controllable ringing generator for generating a ringing signal and an interface for providing a ringing voltage derived from that signal on the transmission line. The controllable ringing generator includes a control device for controlling the ringing voltage in response to the ringing current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.