Systems and methods for characterizing loop termination via single-ended line testing
US8300771B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 1, 2008 |
| Grant date | Oct 30, 2012 |
| Priority date | — |
| Expiry date | Aug 30, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/302
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Disclosed are various embodiments for determining a state of loop termination. One embodiment comprises receiving an un-calibrated echo signal for the loop under test using frequency domain reflectometry single-ended line testing (FDR-SELT) and determining the state of loop termination based on phase of the un-calibrated echo signal. The step of determining the state of loop termination comprises determining whether the loop is terminated by an open termination or a short termination by correlating the phase of the echo signal with an expected phase of the echo signal derived from measurements taken at the same loop length for open and short terminations. For other embodiments, the amplitude of the un-calibrated echo signal is analyzed to determine whether the loop is terminated by a matched-impedance termination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.