To trigger real-time recording for an alarm event, which input on a DVR is used?

To trigger real-time recording for an alarm event, which input on a DVR is used?

• A. Alarm inputs
• B. Audio inputs
• C. Video inputs
• D. Power inputs

Answer: (A)

Alarm inputs provide the trigger from external sensors to the DVR. When a sensor detects something—like a door opening, motion in a zone, or an alarm panel sending a signal—it closes a circuit or sends a digital signal to the DVR’s alarm input. The DVR is configured to start recording when it sees this alarm event, so real-time video begins to capture immediately, often with some pre-event frames stored so you don’t miss the moments just before the alert. This input is specifically for triggering events; it’s different from video inputs (which carry camera feeds), audio inputs (which carry sound), and power inputs (which supply power).

Alarm inputs provide the trigger from external sensors to the DVR. When a sensor detects something—like a door opening, motion in a zone, or an alarm panel sending a signal—it closes a circuit or sends a digital signal to the DVR’s alarm input. The DVR is configured to start recording when it sees this alarm event, so real-time video begins to capture immediately, often with some pre-event frames stored so you don’t miss the moments just before the alert. This input is specifically for triggering events; it’s different from video inputs (which carry camera feeds), audio inputs (which carry sound), and power inputs (which supply power).