User Manual

Videoswitch VDM Digital Recorder
Vdm601t.doc 12
3 Recording
Unless specifically configured otherwise, the system will always be recording images from all cameras. Even
when you are playing back images, the system will continue recording.
RECORD
When the record LED on the Hard drive is on, this indicates that recording is taking place.
3.1 Update Rates
This table gives an indication of the overall update rate in images per second that will apply for different
Image Retention settings (see section 10.4.3.1.1) and hard drive capacities assuming an average image
size of 18K bytes. Note that if the average image size is lower, update rates will be higher; if the average
image size is higher, update rates will lower.
To get the update rate per camera, divide the overall update rate by the number of cameras.
Image
Retention/ Drive
Size
160G 320G 500G 600G 800G
7 Days 15 25 25 25 25
14 Days 7 15 23 25 25
31 Days 3 6.5 10 12.5 17
62 Days 1.7 3.3 5.19 6 8
Note that 24-hour mode operation on a conventional VCR time-lapse recorder is about 5
½ images per
second. The shaded cells in this table show where the update rate will be equal to or better than a VCR in
24-hour mode.
3.2 CD Capacity
This table gives an indication of the number of minutes of video that can be archived onto a 700Mbyte CD.
Note that for integrity of evidence, all cameras are recorded.
Image Retention/Drive
Size
160G 250G 320G 500G 600G 800G
7 Days 44min 28 min 22 min 14 min 12 min 9 min
14 Days 88 min 56 min 44 min 28 min 23 min 17 min
31 Days 190 min 124 min 97 min 62 min 52 min 39 min