D-Link DCS-5220 - Wireless Pan/Tilt Internet Camera Network User Manual page 40

Section  - Configuration
Recommendations for Setting Video for the Best Performance:
"Best performance" means the image refresh rate should be the fastest possible and the video quality should be the
best possible at the lowest network bandwidth possible. Three factors, Maximum frame rate, Fixed bit rate, and Fixed
quality in the Video Configuration page, are related to performance.
Recording settings for real-time motion images
To achieve a real-time visual effect, the network bandwidth should be large enough to transmit 20 image frames per
second (fps) or more. If you are on a broadband network over 1 Mbps, you can set Fixed bit Rate to 1000Kbps or
1200Kbps, or set Fixed quality to achieve the maximum frames. The maximum frame rate is 25 in 50Hz system and
30 in 60Hz system. If your network bandwidth is more than 384Kbps, you can adjust Fixed bit rate according to your
bandwidth and set the maximum frame rate of 25 to 30.
If the images vary dramatically in your environment, you may slow down the maximum frame rate to 20 to decrease
the transmitted data for better video quality. Since the human eye can not easily differentiate between 20 and 25 or 30
frames per second, the slower frame rate will not be noticed. If your network bandwidth is below 384 Kbps, you should
adjust the bit rate according to your bandwidth and experiment to allow for the best frame rate that can be achieved.
The faster frame rate in a slow network will blur the images. You may also try to choose 320x240 in size option for better
images or 640x480 for larger image size. Because the network has burst constraints and everyone's environment is
different, any poor connection will impair normal performance.
Recording settings for clear identification for each image
To have the best video quality, you should set Fixed quality to detailed or excellent and tune the Maximum frame rate to
suit your network bandwidth. If you get some broken pictures in a slow network, you can set TCP protocol in Connection
type for a more accurate transmission but the received images may have a lag. Note that any slow connection with
multiple users will impair performance.
Recording settings to compromise between real-time and clear images
If you have a broadband network, set Fixed quality to Good image quality, or higher, instead of setting the Bit rate.
Otherwise, fix the bit rate according to your actual network speed and set the frame rate to 30. If the image quality is
low, select a lower frame rate above 15. If the image quality is still not improved, select a lower bit rate.
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