Appendix C: Bandwidth Calculation

The frame rate of video transmitted from the ICA-500 depends on connection bandwidth between client and server and quality setting of server. Here is a guideline to help you roughly estimate the bandwidth requirements form your ICA-500.

Image bandwidth is approximately equal to the average frame rate in frames per second multiplied by the average frame data size in kilobits. Frame data size, or the number of bits comprising a single video frame varies a great deal from depending on scene complexity, lighting conditions, camera noise, etc. The table shown below is reference figures. Actual results generated by the ICA-500 may be varying.

Image Resolution

Average range of Data Sizes

 

176 x 144 (QCIF)

20

– 40k bit

 

320 x 240 (QVGA)

56– 92k bit

 

352 x 288 (CIF)

64 – 112k bit

 

640 x 480 (VGA)

160

– 320k bit

 

For example, streaming 2 fps of 320 x 240 video requires 112 to 184 kbps (kilobits per second). Therefore, with a 128K upload connection; you will typically see 3 to 6 frames per second with 176 x 144 resolution and 1 to 2 frames per second with 320 x 240 resolution without audio stream.

Not

Audio streaming also takes bandwidth around 32 kbps to

64kbps. Most ADSL/Cable modem upload speeds may not

e

even reach up to 128 kbps. Thus, you may not be able to

receive any video while streaming audio on a 128 kbps

 

or lower connection. Even though the upload speed is

 

more than 128kbps, for optimal video performance,

 

disabling audio streaming will get better video

 

performance.

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