Canon VK-16 B

145

The bandwidth and disk space requirements for using VK-64 can be determined by

calculating the recording frame rate, number of camera servers and frame size.

For example, a system using:

16 camera servers (VB-C50i) each recording continuously at 5 fps,

With each camera set to Medium Size for video capture and Quality set to 50, and

Frame size* per single frame is approximately 15 KB...

...requires a bandwidth for a single camera server of approximately:

600Kbps (15KB x 8bit x 5fps).

In this case, the total bandwidth for 16 camera servers would be approximately 9.6Mbps

(600Kbps X 16 cameras = 9600Kbps).

*The frame size figure shown above is an example. Please note that the actual frame size

varies depending on the video content.

The recording throughput required by the Storage Server is not the

total traffic on the network, as this does not include viewing of live

cameras and playback of recorded video by Viewers, and any other

network traffic.

Note

The above figure can also be used to calculate the hard disk requirements used by the

Storage Server. For the above configuration, if the 16 Camera Servers are being recorded

continuously at 5 frames per second all day, every day, the disk requirements would be

approximately 100GB per day (15KB x 5fps x 16 cameras x 60 seconds x 60 minutes x 24

hours = 103680000KB per day).

However, when determining hard disk sizes it is important to take into account that there

needs to be some ‘overhead’. For example, if the [Maximum file size/duration] (tP. 23) is

configured to 1024MB (1GB), a video file of 1GB is created per every single camera

server. Therefore when the Storage Server deletes old recorded data, the full 1GB will be

deleted according to the disk space management description (tP. 24) and disk space

management operating examples (tP. 146); with 16 Camera Servers, totalling 16GB.

So, for example, the above-mentioned hard disk requirements could be increased by 16GB

to deal with this situation.

As the above figures are for continual recording, the hard disk usage can be substantially

reduced by using sensor-based or motion-based recording and/or by limiting recording to

certain times of the day or days of the week. The disk usage that would result from

applying these settings would depend greatly on the frequency of occurrence of such

sensor and motion events and the number of defined days and times therein.

For the above figures please note that the bandwidth is calculated as 1000Kbps = 1Mbps,

and the disk size as 1024KB = 1MB.