User guide

Digital Video Hardware User Guide
revision 38 — 61
Note: The dongle and license information belongs on the B.A.S.I.S. Database Server and should NOT be
installed on the LDVR-3U.
LDVR-3U Configurations
LDVR-3U configurations differ by the capture board model and video storage
volume. Each recorder can contain up to four DV-4UP-30F or DV-8UP-S video
capture boards, depending on the configuration you purchase. DV-4UP-30F
video capture boards support four input channels each (for a total of 16 video
inputs per LDVR-3U). DV-8UP-S video capture boards support eight input
channels each (for a total of 32 video inputs per LDVR-3U).
LDVR-3U recorders can be configured as a single RAID 5 array or multiple
storage drives (1 volume per storage drive). The exception is the primary drive,
which is divided into two volumes. The single RAID 5 array configuration
tolerates one bad hard drive at the expense of decreased storage capacity.
Unfortunately, if more than one drive goes bad, you will loose all your recorded
data. On the other hand, multiple storage drive configurations provide an
increased amount of storage capacity. If one hard drive goes bad, you will loose
the data on that drive.
* LDVR-3U currently supports nine120 GB hard drives. Larger hard drives may
become available as technology progresses.
Video Compression
MPEG-1 compression is used to store video on the recorder. This video
compression technique is based on the concept that although action is taking
place, the background is immobile and therefore large portions of the scene are
redundant. Compression is started by creating a reference frame. Each
subsequent frame of video is compared to the previous frame and the next frame,
and only the differences between the frames are stored. The amount of data saved
is significantly reduced.
Reference frames are also compressed but they are not based on information
from any other frame. Reference frames are recorded at a regular interval (intra
frame rate) to keep the amount of accumulated error caused by successive frame
Video Storage
Drives*
Video Storage Volumes Video Storage
Capacity
Video Capture Boards
1 to 9 DV120GB One volume per storage drive except
for the primary drive which will be
divided into two volumes.
116 to 1076 GB 1 to 4 DV-4UP-30F or 4 to 16
video channels
1 to 4 DV-8UP-S or 8-32 video
channels