| 摘要 |
PURPOSE:To decrease the number of wires used for calling control by constituting the titled system so that a centralized supervisory equipment in the control room receives signals from a telephone line, a terminal telephone system, and a main door bell unit, and controlling the switching of the connection lines from the above three system components in a main switch control equipment. CONSTITUTION:At the first, when a fire sensor in one compartment of the house detects a fire, an alarming signal is transmitted to the security part 12 of the terminal telephone system 1 and it is propagated and displayed. The said signal is also transmit ted to the main switch control equipment 3 through a pair of connecting wires 2. In the equipment 3, the wires 2 are connected to the centralized supervisory equipment 4 all the time except when the telephone system 1 is busy. Therefore, the equipment 4 receives the said alarming signal, and informs the controller (person) of the abnormal ity. At the second, in case of arrival of the signal at the telephone system 1, when the signal arrives from an exchange at the station 8 through a telephone line 7, the signal goes through a connection terminal box 6 and reaches the equipment 3. The equipment 4 detects this arrival at the equipment 3 of the signal, and controls the equipment 3 to connect the wires 2 which come from the telephone system 1 correspond ing to the line 7 with those 9.
|
