Impedance setting circuit for a SLIC
US5515434A · kind A · utility
13Cited by
13References
20Claims
0Family size
Inventor
Key dates
| Filing date | Jun 29, 1994 |
| Grant date | May 7, 1996 |
| Priority date | — |
| Expiry date | Jun 29, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M19/026
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A current mode subscriber line interface circuit (SLIC) for telephone system in which AC and De impedances for tip and ring connections of the SLIC are separately set. A DC filter separates the DC and AC components of tip and ring currents, and a current amplifier amplifies the AC components separately from the DC components. A pair of resistors set the AC impedance value, and also may be used to set SLIC four-wire to two-wire gain separately from SLIC two-wire to four-wire gain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.