Telephone line interface circuit with intelligent line current and voltage control
US6731749B1 · kind B1 · utility
3Cited by
21References
36Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 14, 1999 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | May 14, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/005
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A telephone line interface circuit is disclosed having intelligent line current control that can adjust to the various requirements of worldwide telephone systems (DC masks), and/or can reduce the power consumed by the interface circuit. A controller reads a voltage value and based on the theoretical model of a telephone line network, and the expected current/voltage characteristic, as dictated by the appropriate DC mask. The controller sets the line current (via an output voltage) to an optimum value and causes the line voltage to adjust so as to comply with the DC mask and/or minimize power dissipation in the circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.