Switching device connectable to a subscriber's telephone line

Details Switching device connectable to a subscriber's telephone line Switching device connectable to a subscriber's telephone line

H - Electricity

04

M

379/8

H04M 11/00 (2006.01) G11B 31/00 (2006.01)

Patent

CA 1206637

ABSTRACT OF THE DISCLOSURE: A switching apparatus connectable to a normal subscriber's telephone line and including a plurality of connectors for connecting at least one external system, such as a T.V. set, a tape recorder, a radio receiver and the like. The apparatus comprises a first switching device including a circuit for detecting conditions on the tele- phone line, and a first electrical supply including at least one of said connectors. The first switching device connects said at least one connector to, or disconnects it from an electrical power source depending on the detected conditions. A second switching device is activated by the first switch- ing device after detection by the detecting circuit of a first condition amongst said conditions. There is also pro- vided a circuit for deactivating the second switching device upon occurrence of a release signal on the line, and a circuit for simulating a second condition on the line. The second switching device interconnects the simulating circuit with the line when said second switching device is activated. Another circuit controlled by the first and second switching device is provided for a bidirectional transmission of information signals between the line and the external system connected to the switching apparatus. The apparatus may also comprise a second electrical supply including another connector, and a third switching device for connecting said other connector to, or disconnecting it from the electrical power source. The third switching device is controlled by a circuit which preferably includes two timers. Such a switching apparatus can be used for switching on or switching off the system connected thereto and/or for establishing connections between this system and the telephone line in relation with the conditions present on the line.

431663

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