Security device for securing a telephone line between a central telephone and a telephone post

摘要

The device includes a control module (10) placed on a telephone line (1) and includes detectors (15) to disconnect/reconnect this receiver (30). There are transmission members (16) at the telephone post having a random encryption number (RND) and a unit (13) for cutting off the telephone link (1). The unit for detection of the disconnection/reconnection of the receiver controls the cutting-off unit of the telephone link after reconnection, the unit (16) for transmission of the random encryption number is not activated, until after the cutting off of the telephone link.