Ring-trip circuit

Details Ring-trip circuit Ring-trip circuit

H - Electricity

04

M

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

Patent

CA 2273957

A ring-trip circuit monitors the voltage developed across a source resistor coupled to one of the leads of the subscriber line circuit, regardless of the ringing frequency of the ringing voltage applied to the line circuit, and irrespective of the polarity of the DC loop current developed in the line. In response to detecting a prescribed threshold level of the source resistor voltage - indicating that the customer has answered the call, the ring-trip circuit provides a digital output that is read by the control equipment of the central office to terminate the ringing voltage.

Un circuit d'arrêt de sonnerie contrôle la tension dans une résistance source couplée à l'un des conducteurs du circuit de la ligne d'abonné, sans tenir compte ni de la fréquence d'appel de la tension de sonnerie appliquée audit circuit de ligne, ni de la polarité du courant continu dans la ligne. En réponse à la détection d'un niveau seuil prédéterminé de la tension de la résistance source, indiquant que l'abonné a répondu à l'appel, le circuit d'arrêt de sonnerie fournit une sortie numérique qui est lue par le matériel de commande du central, de façon à faire cesser la tension de sonnerie.

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