QNAP Security VioStor NVR (Version: 3.5.1) - Manual (Page 196)

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(4) Connection failure
This option allows the NVR to trigger an action when the IP camera or the video server
is disconnected. Select ‘Camera Event’ from the ‘Event List’. Locate the channel
and click ‘Connection Failure’. After that, define the action on the right (discussed in
the later sections).
(5) Recording failure (NVR event)
This option allows the NVR to trigger an action when the video recording of the IP
camera or the video server fails due to the hard disk bad blocks, file system crash, or
other reasons. Select ‘NVR event’ from the ‘Event List’. Click ‘Recording failure’.
Then define the action settings on the right (discussed in the later sections).