A method for off-hook detection during ringing and the use...

H - Electricity – 04 – M

Patent

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H04M 3/22 (2006.01) H04M 19/02 (2006.01)

Patent

CA 2179995

A method for off-hook detection at a subscriber line interface circuit upon the occurence of a ringing signal which preferably lacks a direct current component, as well as the use of a subscriber line interface circuit for the performing of said method, comprising the steps of generating a signal which is a function of the line current (il) through the subscriber line, measuring the time (.DELTA.t) the signal exceeds a first reference value (Vth), which represents a predetermined current value, comparing the measured time (.DELTA.t) with a predetermined time value and indicating off-hook in a processor in dependence of the comparison.

L'invention concerne un procédé de détection de décrochage sur un circuit d'interface de ligne d'abonné, au moment où intervient un signal d'appel qui de préférence ne comporte pas de composante de courant direct, ainsi que l'utilisation d'un circuit d'interface de ligne d'abonné qui permet de mettre ledit procédé en oeuvre. Ce procédé comprend plusieurs étapes: produire un signal qui est fonction du courant de ligne (il) qui circule sur la ligne d'abonné, mesurer le temps (.DELTA.t) où le signal dépasse une première valeur de référence (V¿th?), qui représente une valeur de courant prédéterminée, comparer le temps mesuré (.DELTA.t) à une valeur de temps prédéterminée et indiquer le décrochage dans un processeur en fonction du résultat de la comparaison.

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