"From security and passenger safety to operational efficiency, video surveillance systems play a pivotal role in maintaining a secure and smooth-running airport environment. Security requirements for airports are stringent and cover almost all aspects of security, from perimeter protection, building management, crowded public spaces, multiple restricted areas, complex access control requirements, control rooms, guard tours, critically-important internal communications, public address system and emergency response solutions. Most airports of any size are considered to be CNI (Critical National Infrastructure) sites and are targets for a wide range of nefarious activities ranging from petty theft to terrorism. Airports therefore require a complete range of the most advanced security equipment available."