Method and system for improved single-ended loop make-up identification
US7010441B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 14, 2004 |
| Grant date | Mar 7, 2006 |
| Priority date | — |
| Expiry date | Jun 21, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M3/2209
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a method and system for determining the composition of a subscriber loop, the method consists of analyzing the echo responses generated by the transmittal of pulses onto the subscriber loop. In the method, discontinuities along a loop are identified sequentially by comparing the measured waveform to waveforms generated on the basis of a hypothesized topology. The best match for the waveform is identified using a maximum likelihood approach and a maximum a-posteriori probability (MAP) estimator using observed knowledge regarding the loop plant. A multiple path search is also utilized to improve results and reduce computation time. Once the generated waveform that best matched the measured data had been found and a discontinuity identified, the waveform generated is subtracted from the measured data to produce a compensated waveform, which is used to detect the location and cause of the next echo. A calibration method is implemented to further improve data acquisition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.