The structural and termination characteristics of a telephone or other wiring circuit can be determined by generating a continuous stream of low-energy electrical signals, injecting these into the circuit under test, and analyzing the energy reflected at impedance changes in the frequency domain. Standing...http://www.google.fr/patents/US7071700?utm_source=gb-gplus-shareBrevet US7071700 - Characterizing analog and digital telephone circuits and other types of wiring systems using frequency domain reflectometry (FDR)
Characterizing analog and digital telephone circuits and other types of ...
