Canon Vb-C60 Network Video Recorder VK-64/VK-16 Administrator's Manual - Page 41

System Overview System Design Concept 3. CPU: Pentium 4 3.8GHz, memory: 1GB, graphics board: Quadro FX1700 When using the VB-C60 with Resolution=340 x 240 and Quality=3: Total frame rate: JPEG image---Max. 280 fps 1 MPEG-4 video---Max. 240 fps Tip z The total frame rate is calculated as: Number of Camera Servers in the Viewer window x Frame rate. That means, with 10 Camera Servers and 10 fps frame rate, the total frame rate is 100 fps. z Note that the total frame rate above varies depending on the combination of the PC and graphics board. It is also affected by other applications (e.g., anti-virus application) running on the same PC. z When displaying MPEG-4 video in VGA, the maximum frame rates are the one-forth of the above frame rates. Network Bandwidth Concept You should consider the network bandwidth when recording video or viewing live video from the network camera. The network bandwidths should be calculated separately for recording and live viewing. Example: With one recording server (QVGA, 1 fps) and two live viewing servers (QVGA, 5 fps): • Bandwidth for recording 15 (KB/frame) x 1 (frame/sec) x 8 (bits) = 120 Kbps • Bandwidth for live viewing (per server) 15 (KB/frame) x 5 (frame/sec) x 8 (bits) = 600 Kbps Therefore, required network bandwidth is calculated as follows: 120 Kbps x 1 + 600 Kbps x 2 = 1320 Kbps = Approx. 1.3 Mbps Note that the line speed unit is bps (bits per second). 1-27