Perimeter security is the installation of a monitored pulse fence around the edge of your site which helps to keep it secure. The fence has two key purposes – to provide deterrence, and to give you awareness if someone does try to enter your site.

Gallagher pulse fences are made up of energized, high-tensile wire that can be constructed inside a new fence or added to an existing one. The wires are monitored and will trigger an alert as soon as they are touched

https://security.gallagher.com/en/Solutions/Perimeter-Security