	US 7,515,691 B2
	Method for testing DSL capability of telephone lines
Roderick Warner, Mapledurwell (United Kingdom); Muhammad A. Afzal, Elk Grove Villa, Ill. (US); Frank R. Bauer, Long Grove, Ill. (US); and Joseph S. Rosen, Chicago, Ill. (US)
Assigned to Tollgrade Communications, Inc., Wilmington, Del. (US)
Filed on Oct. 01, 2004, as Appl. No. 10/956,816.
Prior Publication US 2007/0230667 A1, Oct. 04, 2007
Int. Cl. H04M 1/24 (2006.01); H04M 3/08 (2006.01); H04M 3/22 (2006.01)

U.S. Cl. 379—1.04 [379/9; 379/12; 379/15.03; 379/22.02; 379/24]

37 Claims

1. A method for performing a test of DSL capability comprising the steps of:

accessing a telephone line along a test path, said test path including at least one voice switch test bus and a splitter;

ascertaining in the background to DSL service on said telephone line a plurality of line characteristics of said telephone line along said test path using mid-band frequency signals and narrow-band frequency signals;

analyzing said plurality of line characteristics to identify a plurality of line conditions which affect DSL service; and

determining an impact level of one or more selected line conditions on DSL service.