RU2110844C1 - Method for guarding and fire alarm - Google Patents

Abstract

FIELD: protection equipment. SUBSTANCE: in case if alarm message cannot be sent from monitored object terminal to dispatching center through corresponding commutator channel method involves transmission of this message through local network, by which object terminals are connected, to other object terminals which send this message to dispatching center. Commutator line state is monitored; object terminals test one another. Fault message is also transmitted through local communication network to adjacent object terminals in order to transmit them to dispatching center. EFFECT: increased reliability. 1 dwg

Description

 The invention relates to security and fire alarms and can be used to create centralized systems of protection against penetration and fire.

 Known methods of security and fire alarms, consisting in the fact that an alarm message is transmitted from the object terminal devices via telephone lines by means of a dial-up telephone connection to the central monitoring station (CMS) [1 and 2].

 A disadvantage of the known methods is that in case of a malfunction of the telephone communication line at the guarded object or when the intruder deliberately disables it, sending messages to the central monitoring station is impossible, and the monitoring station does not receive information about the malfunction of the line. In addition, if the object terminal device itself fails, for example, when the power source fails, the monitoring station also does not receive information about this.

 The patented invention is aimed at eliminating these disadvantages, while the technical result achieved is to increase the reliability of the security alarm.

 The achievement of the indicated technical result is ensured due to the fact that if it is impossible to transmit an alarm message from any object terminal device via its telephone communication line, the message is transmitted via a local communication line connecting the object terminal devices to at least one of the nearby object terminal devices devices, and relay it to the central monitoring console, while periodically monitoring the telephone line of each object terminal device, in the event of a malfunction that interferes with the normal transmission of messages, transmit a message about it through a local communication line between the object terminal devices for subsequent relay to the central monitoring console, in addition, periodically verify the operability of the object terminal devices by transmitting reception on the local line communication by each object terminal device of the signal "I WORK" and in the absence of the mentioned signal from any the terminal device for a predetermined time interval transmit to the central monitoring console a signal about the malfunction of this object terminal device.

 The drawing shows a block diagram of a system that implements the claimed method.

 The system contains object terminal devices (OOU) 1, which are connected to the blocks 2 receiving / transmitting information on the local network and blocks 3 control telephone line, as well as additional communication lines 4, forming a local network of nearby OOU. The physical type of additional communication line 4 can be any that provides the required system characteristics, for example, wired or radio. All TOCs are connected to Monitoring Station 5 via a telephone switching connection 6. Each TOC during production or before operation is assigned a unique serial number stored in the monitoring station database and associated with the location (address) of the protected facility on which this instance of TOC is installed. In addition to the serial number, each OOU is assigned a unique local address within the same local network, also stored in the monitoring station database. The monitoring station database has the ability to select objects belonging to the same local network.

 Block 2 receiving / transmitting information on the local network is a device that provides the transmission of information packets from the OOU to another. The physical implementation of this unit may be different, which is determined by the type of communication line used and the required characteristics of the device. Examples of the implementation of such blocks are given in [3]. The information packet transmitted over the local network includes information about the event that caused the transfer, and the local address of the TOC transmitting the packet.

 The control unit 3 in each OOU provides detection of a malfunction or intentional damage to the telephone line used to transmit messages to the monitoring station. The physical implementation of the unit can also be different, in particular, the serviceability of the line can be carried out by the presence of a linear constant voltage or by periodically checking the presence of the signal "station response" [3].

 The principle of the system is as follows.

 The OOU that recorded an event transmits information about it to the monitoring station via its channel. If it is not possible to send an informational message to the monitoring station directly (due to a malfunction or deliberate action), the event information is immediately transmitted via LAN 4 to another (or other) OOU, which, in turn, transfers it to the monitoring station.

 Each message transmitted by the OOU to the monitoring station contains information about the type of event, the serial number of the OOU that transmitted the event and initiated the transmission. Upon receiving the message, the monitoring station, using the serial number contained in it, selects a group of objects connected to the same local area network as the OOU that transmitted the message, and then determines the OOU that recorded the event at the local address also contained in the message. Thus, information about the event can be transmitted from the OOU to the monitoring station not only directly, but also relayed through another OOU, which significantly increases the system's resistance to damage to communication lines. The algorithm for choosing the OOU for relaying is determined by the implementation of the system, in particular, a message on the local network can be transmitted simultaneously to all OOU or the next in a ring chain organized by some feature (for example, by increasing the local address).

 To exclude the possibility of a gradual failure (or deliberate failure) of all channels of the system, each OOU is equipped with a telephone line monitoring unit 3. Each OOU periodically checks its telephone line and operability and, in the event of a malfunction that interferes with the normal transmission of messages to the monitoring station, transmits an information packet about this event to the other (or other OOUs), and in turn, transmits a message about it to The monitoring station in its line. The algorithm for selecting the OOU for transmission to the monitoring station is determined in the same way as in the previous case.

 To monitor the health of the OOU in the system, the following algorithm is used. Each OOU with a periodicity transmits a special message "I WORK" to all other OOUs over the local network, which is a sign of its serviceability to other OOUs. If during a given time interval a signal from any TOC has not been received, then this TOC is considered to be out of order and information about this is transmitted to the monitoring station by all TOCs that recorded the event.

Claims (1)

 Method of fire alarm, which consists in the fact that an alarm message is transmitted from object terminals via telephone lines via a telephone switching connection to a central monitoring console, characterized in that if it is not possible to transmit an alarm message from any object terminal device in its own way the telephone line, the said message is transmitted via a local communication line combining object terminal devices to at least one of the closely located object terminal devices and relay it to the central monitoring console, while periodically monitoring the telephone line of each object terminal device and, in case of a malfunction that impedes the normal transmission of messages, transmit a message about it via a local communication line between the object terminal devices for subsequent relay it to the central monitoring console, in addition, periodically interoperate the performance of the object terminals x devices by transmitting / receiving through the local communication line by each object terminal device the signal "I WORK" and in the absence of the mentioned signal from any object terminal device for a predetermined time interval, transmit to the central monitoring station a fault signal of this object terminal device.