User guide

3: Digital Video System
22 —
revision 38
Note: The dongle and license information belongs on the B.A.S.I.S. Database
Server and should NOT be installed on the digital video server.
Video Compression
MPEG-1 compression is used to store video on the recorder. The 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 the 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 are not based on information from any
other frame. They are recorded at a regular interval (intra frame rate) to keep the
amount of accumulated error caused by successive frame differencing under
control. The intra frame rate is automatically determined by the recorded frame
rate: 1 reference frame every second when recording at the highest rate (15 fps
Main Board Intel D845GBVL Motherboard
Intel Pentium III & Celeron Processors
Support UDMA 66 MB/S, 1 GHz FSB
FC-PGA 370 Socket
4 PCI Slots
2 x 168 PIN Memory Slots Up to 512 MB
Audio onboard
Video onboard
Intel 52559 LAN onboard
Micro ATX Form Factor
Operating System Windows 2000 Professional
RAM SDRAM 512 MB DDR266 DIMM, 2.5 V, Unbuffered,
SPD, 184 PIN
HDD 120 GB EIDE hard drives
CD-ROM Drive Slim CD-ROM drive (located in front of unit)
FDD Floppy disk drive - 1.44 MB (3.5”)
Video cards Option 1: 8-channel digital video capture card
Option 2: 4-channel digital video capture card
Case 4U shelf chassis
Power Supply 300 W (Switching Power Supply)
System Components (Continued)
Item Special