Samsung SRN-470D User Manual page 106

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Event
For more information, refer to "Setting the Event". (Page 68)
Sensor Detection
NVR/Network Camera
You can set the sensor operation mode and the synchronized
camera as well as the alarm output type and the duration.
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If the connected network camera that has configured the alarm in/out
settings triggers an alarm, NVR will perform the alarm out.
Camera event
You can set camera event mode, alarm output type and alarm
time.
Video loss detection
You can set to trigger the alarm if a video loss occurs.
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