User Guide

NETNode Operations Guide
Commercial in
Confidence
IP Mesh Systems
000-130
R1.8 2015-07-24
Commercial in
Confidence
Page 2-34
Figure 2-12 Recorded video file system
Each file is one chunk representing 30 seconds of data. When the number of chunks is
reached, the oldest file is deleted and recording continues providing the SD capacity is not
exceeded.
For example to set a continuous recording of the last five minutes of encoded video you
would set the number of chunks to 10 and this would continuously record and overwrite the
last five minutes of video.
With a 1Mb/s video stream and a 2GB SD card a user can record just over four hours of
video data.
1Mb/s is equivalent to 125kBytes/second of data. A 2GByte SD card can store 16,000
seconds of video before it hits capacity or 533 30 second chunks.
To keep a safe margin a 500 chunk limit must be used giving just over four hours of
recording if recording a 1Mb/s video stream.