Countries establish their public warning systems to warn against common danger. Typical past dangers are the military danger and the danger of natural disasters. Recent industrial production has brought the danger of industrial disasters and, when talking about the actual situation in the world, the danger of terrorist attacks. As for the emergency situations caused by such dangers, countries, represented by relevant institutions, have various emergency plans prepared to notify employees in charge of the procedures to be taken. These also include procedures for warning the public via acoustic warning systems. Despite the existence and usage of various ways of conveying warning messages to the public e.g. television, radio, mobile phones, the warning systems based on electronic sirens with their own communication infrastructure represent the most reliable method for warning the public in threatened areas.

This unique and complex solution uses the entire technology of our product portfolio. Within several seconds, the system is able to activate any siren or a group of sirens (depending on access rights) from any warning and notification centre on the territory of the state given. The feedback information on successfulness/unsuccessfulness of such activation is provided by such system within several minutes. It is possible to activate both the sirens of national warning systems and the sirens of autonomous warning systems run by industrial enterprises and equipped with an interface for communication with the national system. Warning and notification centres can be, at the same time, equipped with software designed to control a siren network and to automate the processes carried out following an emergency situation notification. The above-mentioned warning and notification system covers the entire area of a certain country and consists of the following:

• Main warning and notification centre at the state level;
• Regional warning and notification centres;
• Mobile warning and notification centres;
• Communication infrastructure interconnecting individual warning and notification centres;
• Radio communication-based infrastructure designed to monitor and control sirens and functioning at designated radio frequencies;
• RDS communication infrastructure using radio broadcasters;
• Network of several thousands of PAVIAN-type sirens;
• Autonomous warning systems, established and operated by industrial public endangering companies;

Local warning and notification centres
Local warning and notification centres represent fully autonomous workplaces providing the same activities as are those provided by the main centre. Their provision however, is limited to this centre’s region. This limitation is defined by access rights so that each warning centre can take up the role of a main or any other warning and notification centre. As for the situations when their communication with the main warning and notification centre is interrupted, local centres operate fully autonomously and are able to fully cover the region with their functionality.

Communication infrastructure designed to interconnect warning and notification centres
Warning and notification centres are interconnected via a designated backed up wire connection. This is to connect computers of the centres to an integrated system, in which data is synchronized amongst centres and which enables creation of a desired hierarchy of the system control.

Radio communication infrastructure designed to control sirens
This radio communication-based infrastructure is used to control and monitor the status of individual sirens. It is established on the basis of SMART communication units and works at designated frequencies. All its elements are able to go on for the period of 72 hours following a power cut. This infrastructure also includes sirens equipped with radio modems, which can, at the same time, function as signal boosters.

RDS communication infrastructure designed to control sirens
VHF radio broadcaster signals basically cover the entire populated area of a state. This also transmits RDS signals used to control sirens. Individual warning and notification centres join modulation routes of such broadcasters and, can, via those, control sirens, switch sirens to the mode of broadcasting the same information as radio broadcasters or interrupt radio broadcasting with a message broadcast from a warning centre. This can be very effective when used to notify the public in the case of an emergency.

PAVIAN electronic sirens
PAVIAN-type electronic sirens are used as a terminal acoustic element. They are designed to cover a required populated area by acoustic signal of desired pressure. Both, the populated area and desired acoustic pressure, depending on background noise, are defined by legislation in most of the countries. Considering great demands laid on such system reliability, the whole functionality of this type series, especially system its auto-testing functions are applied.