Frequentis AG engages in developing, marketing and supplying of communication and information systems for control centers with safety-critical tasks. It operates through the following segments: Air Traffic Management and Public Safety & Transport. The Air Traffic Management (ATM) segment serves civil and military air traffic control and homeland security organizations. The Public Safety & Transport (PST) segment comprises public safety (police, fire, and emergency rescue services), public transport (railways), and maritime (coast guard, port operators, and organizations that monitor shipping on inland waterways). The company was founded in July 1, 1947 and is headquartered in Vienna, Austria.