Which term refers to a communications path used by intrusion detection systems to monitor events?

• A. Sensor
• B. Transmission Line
• C. Alarm
• D. Control panel

Answer: (B)

The pathway that carries data from sensors to the monitoring point is called the transmission line. In an intrusion detection system, sensors detect events (like a door opening or motion) and then send that information along a communications path to a central panel or monitoring station so the event can be recorded and, if needed, an alarm triggered. The term specifically describes the channel or medium used for this data flow—wired cables, fiber, or wireless links—so the system can monitor events in real time.

A sensor is the detector itself, an alarm is the notification produced after an event is detected, and a control panel is the processing hub that evaluates signals and initiates alarms. None of those describe the communication path as directly as the transmission line.