Method of generating a ring signal in a subscriber line interface circuit technical field
US6973181B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 2002 |
| Grant date | Dec 6, 2005 |
| Priority date | — |
| Expiry date | Oct 11, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/305
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a method and a device for controlling the magnitude of the generated ring signal in a the Subscriber Line Interface Circuit (SLIC) the voltage of the A and B lines to the subscriber from the SLIC is compared to a reference voltage. The device is arranged to control the magnitude of the generated ring signal voltage in response to the outcome of the comparison. In particular, the device is arranged to control the ring signal voltage so that the ring signal voltage is reduced if the voltage on the A or B line exceeds the reference voltage. Also, the reference voltage is preferably chosen so that there is no risk for saturation of the final stages. The reference voltage is preferably selected to have a value being related to the value of the negative supply voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.