Apparatus and method for measuring loop impedance
US6434232B1 · kind B1 · utility
3Cited by
2References
20Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 23, 1999 |
| Grant date | Aug 13, 2002 |
| Priority date | — |
| Expiry date | Aug 23, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R27/16
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a subscriber loop interface circuit, a novel method and apparatus for measuring loop impedance. Measurement of loop impedance including charging and discharging a capacitor using current derived from loop current and loop voltage. The discharge time interval of the capacitor may provide information on loop impedance. A look-up table in a subscriber loop interface circuit may include previously calculated impedance values corresponding to discharge time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.