Physical Security Systems and Technology
The core idea
Physical security systems detect, delay, and respond. Candidates should understand the layered defense concept and the functions of intrusion detection, access control systems, video surveillance (CCTV), alarms, and lighting. The aim is to increase an adversary's time and risk while reducing the defender's detection time. Learn the PPS (physical protection system) triad: detection, delay, response.
Concepts to master
- Alarm systems: sensors (PIR, door contacts, glass break), control panels, and monitoring; false alarm management.
- CCTV: coverage, image quality, retention, privacy law, and evidential integrity (time sync, export logs).
- Access control technology: card readers, biometrics, and their failure modes.
- System integration: alarms triggering video and access lockdown.
- Maintenance and testing: scheduled checks, battery backup, and tamper detection.
- Human-machine interface: operators must be trained; technology does not replace judgment.
Traps in exam questions
Examiners test whether you over-trust technology. Cameras are detection and evidence, not prevention on their own; a camera without monitoring or response changes nothing. Another trap is assuming more sensors always mean better security (false alarms cause alarm fatigue). Watch for answers that ignore privacy and data protection obligations, or that treat a recorded image as automatically admissible evidence.
Worked rule of thumb
For any system, ask the three questions: Does it detect the threat in time? Does it delay the adversary long enough? Is there a response force able to arrive before the adversary succeeds? If any answer is no, the system has a gap. Example: a fence delays, a sensor detects, but without a guard response the delay is wasted.
Key points
- Physical protection = detection + delay + response.
- Cameras support detection and evidence; they do not prevent alone.
- Manage false alarms to prevent alarm fatigue.
- Test, maintain and back up systems on schedule.
- Respect privacy law and preserve evidential integrity.