Zones
A zone is an area that is being protected, and/or a collection of sensors that are protecting the zone. Zones can contain Passive Infrared Sensors (PIR sensors), glass break detectors, window contacts, or a combination of different sensors.
For example, "ground floor windows" could be a zone. Ground floor PIR sensors could be another zone. There are also "special" zones such as fire alarm zones. In commercial installations, the fire alarm zones and CO (carbon monoxide) detectors must have their own zone.
In the following chapters, you will see how we will use these zones to create a layered defense.