Daniel Scott Mueller

US Patent:

7602885, Oct 13, 2009

Filed:

Dec 29, 2005

Appl. No.:

11/322105

Inventors:

Muhammad Akbar Khan Afzal - Elk Grove Village IL, US
Daniel Edward Mueller - Evanston IL, US
Arthur Alamo - Milwaukee WI, US

Assignee:

Tollgrade Communications, Inc. - Wilmington DE

International Classification:

H04M 1/24
H04M 3/22

US Classification:

379 24, 379 101, 379 104, 379 22, 379 2901

Abstract:

A telephone line test system that may be used to compute line length of subscriber lines connected to a central office or other distribution point. When initially installed, the test system may automatically compute CO limits. The CO limits are computed from single-ended measurements on subscriber lines and represent electrical effects of the path between a test head and the distribution point. These CO limits are used to more accurately compute the length of lines connected to the distribution point using measurements made by the test system. Because the process uses single-ended measurements, it may be run in background mode during the initial installation of the test system or at any subsequent time it is desired to update the CO limits.