Perimeter security systems covers the entire company grounds - both buildings and outdoor areas. Perimeter security defines and secures to some extent, machines and other things tht are kept outdoors.
Often perimetr security is established combined with e.g. fences and electronic surveillance (CCTV). The perimeter security detects intruders and provide early warning of an "attack", which makes it harder for the thief to get to the building.
A perimeter security can be designed to fit individual needs for security in rlation to the area's natures and location.