Year
1988
Abstract
Chain link fences are a component of almost every perimeter security system, and their use ranges from simply delineating a boundary to supporting sophisticated intrusion detectors. Standard chain link fences provide little delay, and often, fence-mounted sensors can be circum- vented by using a lightweight ladder to jump over the fence with minimum fence disturbance. This investigation summarizes the results of approxi- mately four hundred intrusions against several sensor combinations and fences from seven to twelve feet high. Fence climbing delays range from three to twenty seconds, depending on the fence and sensor combination used, and detection probabilities vary from low, in some cases, to very high for one configuration which has never been crossed without an alarm. A perimeter fence/barrier/sensor combination designed to delay and discourage intruders and provide for a high probability of detection is discussed as an end result of the investigation.