What describes alarm cross zoning?

• A. It uses multiple sensors to monitor activity in one area, with advanced software analyzing input from all sources.
• B. When a zone with the cross zoning attribute is violated, the panel immediately triggers the siren.
• C. It disables the alarm system until two zones are cleared.
• D. It sends a notification to the monitoring center after the first violation.

Answer: (A)

Cross zoning is a method used to distinguish real intrusions from false alarms by requiring corroborating evidence from more than one sensor within the same protected area. In practice, multiple sensors monitor activity in that area, and the control panel’s software analyzes inputs from all sources together. Only when several sensors are tripped in a coordinated way within a short time will the system trigger the alarm. This reduces false alarms that can occur from a single sensor being triggered by benign events. If only one sensor is activated, there’s no alarm, aligning with the idea that the system relies on cross-checking multiple inputs rather than reacting to a single event.