SE9703319D0 - Telesurveillance systems - Google Patents

Abstract

The present invention concerns a telesupervising system comprising a number of terminal supervising units (1; 1<1>, 1<2>, ...), one or more centralizers (3; 3<1>, 3<2>, ...; 21) and a supervising station (25). The terminal supervising units (1; 1<1>, 1<2>, ...) are arranged to the objects to be supervised. Supervising devices (7, 8, 9) are connected thereto. Each terminal supervising unit (1; 1<1>, 1<2>, ...) is connected to a subscriber line (2; 2<1>, 2<2>, ...) and further to the supervising station (25). According to the invention, each terminal supervising unit (1; 1<1>, 1<2>, ...) is connected by the subscriber line (2; 2<1>, 2<2>, ...) to the supervising centralizer (3; 3<1>, 3<2>, ...); and each supervising centralizer (3; 3<1>, 3<2>, ...) comprises a connection unit and a supervising transmit and receive unit, one or more terminal supervising units being connected to said connection unit, and one or more connection units being connected to the supervising transmit and receive unit. The terminal supervising unit (1; 1<1>, 1<2>, ...) comprises: means for regularly transmitting standard messages to the supervising centralizer, when the status of the object to be supervised remains unchanged; and means for transmitting supervising messages, such as alarm messages, information collecting messages or similar to the supervising centralizer (3; 3<1>, 3<2>, ...) in accordance with the reactions of the supervising devices. The supervising centralizer (3; 3<1>, 3<2>, ...) comprises means for receiving and identifying the messages transmitted from the terminal supervising unit; means for noticing missing of a standard message from any of the terminal supervising units; and means for transmitting messages to the supervising station (25).