Testing of catv systems

Details Testing of catv systems Testing of catv systems

G - Physics

01

R

G01R 31/11 (2006.01) H04B 3/46 (2006.01) H04N 17/00 (2006.01) H04L 12/26 (2006.01) H04L 12/28 (2006.01)

Patent

CA 2315759

A method and apparatus for determining the location of an impedance mismatch in a digital communication circuit (22) generates (20) at least quasi-random data, transmit the data along the circuit (22) from a transmitting end of the circuit (22), recover (24) reflections from impedance mismatches in the circuit (22) adjacent the transmitting end of the circuit (22), correlate the reflections with the data to generate a correlation result, identify a reflection peak in the result, and multiply the propagation velocity of the data through the circuit (22) by a time delay to the reflection peak.

L'invention concerne un procédé et un appareil permettant de déterminer l'emplacement d'une inadaptation d'impédances dans un circuit (22) de communication numérique, lequel appareil génère (20) au moins des données quasi-aléatoires, transmet ces données par le circuit (22) à partir d'une extrémité émettrice du circuit (22), récupère (24) les échos imputables aux ruptures d'impédances dans le circuit (22) adjacent à l'extrémité émettrice du circuit (22), met en corrélation lesdits échos et les données de façon à générer un résultat de corrélation, identifie un pic de réflexion dans le résultat, et multiplie la vitesse de propagation des données dans le circuit (22) par le rapport retard/pic de réflexion.

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