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:
Dec. 30, 2025
Filed:
Jun. 10, 2022
Applicant:
British Telecommunications Public Limited Company, London, GB;
Inventors:
Assignee:
BRITISH TELECOMMUNICATIONS public limited company, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04M 3/30 (2006.01); H04B 3/493 (2015.01);
U.S. Cl.
CPC ...
H04M 3/306 (2013.01); H04B 3/493 (2015.01); H04M 3/304 (2013.01);
Abstract
A method of determining when there has been a change in the modem power state of a modem connected to 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) on the line. This UER trace is compared to a historical (baseline) UER trace from the same line. A difference in the two traces in a higher frequency range (for example, DS3 for a VDSL line), is indicative of a possible modem power state change.