The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 25, 2025
Filed:
Feb. 06, 2023
British Telecommunications Public Limited Company, London, GB;
BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY, London, GB;
Abstract
Presented is a method of detecting a loop length change in a digital subscriber line. An Uncalibrated Echo Response (UER) trace is obtained from the digital subscriber line by running a Single Ended Line Test (SELT). A historical (baseline) UER trace from the same line is retrieved. A line that has experienced a small change in loop length will have the same overall shape, but be compressed or stretched in the frequency domain. Thus, to detect such a change, a comparison between the two traces is made to determine if the difference between the two traces is less than a threshold but non-zero. Then a range of scale factors are applied in the frequency domain on either one of the traces, before determining which of the scale factors results in the lowest difference between the unscaled and scaled traces. The determined scale factor is above a certain threshold, then the line is determined to have had a loop length change. The value of the scale factor can be used to determine the amount the length has changed.