Loop certification and measurement for ADSL
US6477238B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 12, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Sep 12, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/24
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention involves a transmission of a known signal over a line intended for a digital subscriber line (xDSL) service, measurement of a resulting waveform received through the line and processing of the received signal to derive a set of eigenvalues characterizing the transfer function of the line. In the preferred embodiment, a transmitter applies a known test signal waveform to the transmission line. The test signal corresponds to a desired one of several available xDSL services. At the receiving end of the line, the output signal from the line is sampled, to capture a digitized sample waveform for the received signal. A computer processes the captured waveform to determine eigenvalues characterizing the transfer function of the line with respect to the one service. If the eignevalues for the line bear predetermined relationships to threshold values, indicating acceptable line transfer function for the desired xDSL service, then the invention certifies the tested line for use on that service.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.