An arrangement in a subscriber line interface circuit

Details An arrangement in a subscriber line interface circuit An arrangement in a subscriber line interface circuit

H - Electricity

04

B

H04B 3/46 (2006.01) G01R 19/252 (2006.01) H04B 3/48 (2006.01)

Patent

CA 2288907

In a subscriber line interface circuit connected to a telephone line having a high potential wire and a low potential wire, an arrangement for generating a signal for determining the line voltage comprises means (7, 10, 11) for alternately charging a capacitor (6), by means of a first DC current, to a first voltage, and discharging the capacitor (6), by means of a second DC current, to a second voltage. Hereby, a sawtooth wave having an amplitude corresponding to the difference between the first and second voltages is produced. This sawtooth wave is converted to a pulse train related to the line voltage, from which the line voltage can be determined.

La présente invention concerne un circuit d'interface de ligne d'abonné relié à une ligne de téléphone pourvue d'un fil à potentiel haut et d'un fil à potentiel bas, configuré de façon à produire un signal permettant de déterminer la tension d'une ligne. Ledit agencement comprend un organe (7, 10, 11) permettant alternativement de charger un condensateur (6) à l'aide d'un premier courant continu à une première tension, et de décharger le condensateur (6) à l'aide d'un second courant continu à une seconde tension. On produit ainsi un courant en dents de scie dont l'amplitude correspond à la différence entre la première et la seconde tension. Ce courant en dents de scie est transformé en un train d'impulsions correspondant à la tension de ligne à partir de laquelle on détermine la tension de ligne.

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