Test telephone

Details Test telephone Test telephone

H - Electricity

04

M

H04M 3/30 (2006.01) H04M 1/24 (2006.01) H04M 1/68 (2006.01)

Patent

CA 2217991

A test terminal includes a circuit for opening a loop switch to prevent setting up of calls from the terminal via a telephone line when a signal received from the telephone line via a first high-impedance connection exceeds a predetermined threshold indicating that the telephone line is busy. An alarm circuit indicates that any call from the terminal is prohibited. Operation of the terminal in discreet monitoring mode is also prohibited if the line is busy.

Poste d'essai comprenant un circuit permettant d'ouvrir un interrupteur de boucle afin d'empêcher l'établissement de communications à partir du poste sur une ligne téléphonique lorsqu'un signal provenant de la ligne téléphonique par l'intermédiaire d'une première connexion à haute impédance dépasse un seuil prédéterminé indiquant que la ligne téléphonique est occupée. Un circuit d'alarme indique que tout appel provenant du poste est interdit. L'exploitation du poste en mode de contrôle discret est également interdit si la ligne est occupée.

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