Video conferences can be transmitted at different quality level s, depending
on the band width available and the limitations of the equipment.
The bandwidth avail able is based on the amount of use of the network
and the maximum size of the connection. Most schools in England will
have at least 2mbps (2000kbps). To allow for other network traffic it
is suggested that allowing 768 kbps for video conferencing is a realistic
maximum. If the link is full of traffic then it risks quality loss.
Different equipment has different maximum rates. For example lower-end
equipment might not be able to function at more than 384kbps. This maximum
speed of operation helps differentiate between equipment.
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Linked from this page are a number of sample
conferences, showing what the use of different speeds and different
equipment actually means in practice.
128kbps is suggested as a practical minimum for a one-to-one conference and 384kbps for a group conference.
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