A facility’s perimeter is the first line of defense against a variety of potential security threats including unauthorized entry, theft, and espionage. The purpose of a perimeter intrusion detection system (PIDS) is to effectively detect and prevent such events from occurring, providing early warning of intrusion attempts. For years, PIDS traditionally consisted of an amalgamation of conventional security solutions such as physical barriers, fences, surveillance systems, video analytics,and access control, andmore complex technologies such as underground cable systems, fiber optics, and infrared systems. The problem is that these products are reactive in nature, incapable of preventing an intrusion from occurring.