Patent ID: 7050548

Claim:
A method to qualify a local loop (LP), which connects customer premises (CP) to a central office of a telecommunication network (CO), and which comprises at least three loop terminations (TERM 1 , TERM 2 , TERM 3 ), said method comprising the steps of carrying out at a first loop termination (TERM 1 ) out of said at least three loop terminations a first reflectometry measurement of said local loop while a second loop termination out of said at least three loop terminations, which is wired to said customer premises, is loaded with a first impedance (ZL=Z 1 ), thereby providing a first reflectogram, which is used for qualifying said local loop, characterized in that said method further comprises the steps of: carrying out at said first loop termination a second reflectometry measurement of said local loop while said second loop termination is loaded with a second impedance distinct from said first impedance (ZL=Z 2 ), thereby providing a second reflectogram, determining in the time domain a feature which distinguishes said first reflectogram from said second reflectogram, identifying from said feature said second loop termination out of said at least three loop terminations (CP=TERM 2 ).