An alarm is a
|“||device or function that signals the existence of an abnormal condition by making an audible or visible discrete change, or both, so as to attract attention to that condition.||”|
|“||[s]ystem consisting of a central controller connected to detection devices, audible warning devices, keypads and controls, power circuitry, and communication devices. Wireless technology has extended the connectivity of traditional hard-wired systems, and IP technology is rapidly changing and extending the description of what was previously a settled and slow-moving domain. A security alarm is typically positioned within the perimeter of physical security, behind the locking hardware.||”|
- ↑ NIST Special Publication 800-82, at B-1.
- ↑ IT Security Essential Body of Knowledge (EBK): A Competency and Functional Framework, App. B, Glossary.