Series equipment with dc line hold transfer

Details Series equipment with dc line hold transfer Series equipment with dc line hold transfer

H - Electricity

04

M

H04M 3/42 (2006.01) H04M 19/00 (2006.01)

Patent

CA 2232221

A telephone series equipment line circuit for connection between a central office (CO) line and a terminal equipment (TE) line comprising a filter connected between the lines for blocking message signals from passing therebetween and for passing direct current (DC), a DC bypass circuit including a first series switch apparatus connected between the lines around the filter, series equipment connected via a DC blocking circuit and second series switching apparatus to the lines, the first switch apparatus being open and closed reciprocally to the second switch apparatus.

Circuit de ligne série d'équipement téléphonique assurant la connexion entre une ligne de central (CO) et une ligne d'équipement terminal (TE). Ce circuit comporte un filtre connecté entre les lignes afin d'empêcher les signaux de messages de passer entre ces lignes et afin de faire passer du courant continu (c.c.), un circuit de dérivation c.c. comprenant un premier interrupteur série connecté entre les lignes autour du filtre, de l'équipement série connecté par l'intermédiaire d'un circuit bloquant le courant continu, et un second interrupteur série connecté aux lignes, le premier interrupteur étant ouvert lorsque le second interrupteur est fermé et inversement.

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