Method and apparatus for subscriber line control circuit
US7260212B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 30, 2007 |
| Grant date | Aug 21, 2007 |
| Priority date | — |
| Expiry date | Mar 30, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/738
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A subscriber line interface circuit apparatus includes a linefeed circuit and a subscriber line control circuit (SLCC). In an embodiment, the linefeed circuit includes a signal conversion circuit which provides a differential mode signal and a common mode signal in response to at least the tip signal and the ring signal from the subscriber loop. The linefeed circuit includes a tip control circuit and a ring control circuit. In an embodiment, the SLCC is provided in a single integrated circuit chip and is coupled to the linefeed circuit which isolates the SLCC from the tip or ring signals. The SLCC includes a first and a second differential mode inputs for receiving the differential mode signal, and a common-mode input for receiving the common-mode signal. In an embodiment, the SLCC also provides various tip and ring control signals to the tip control circuit and the ring control circuit, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.