Note: The following was taken directly from the PW RtCW FAQ, the same information may not apply to Enemy Territory, stay tuned for more information as things become more clear.
Rule of thumb is to take your upstream bandwidth and divide it by the number of clients you want to serve. That will give you the rough BW required for each client, in bits per second (b/s). Then, just set your sv_maxrate accordingly.
The sv_maxrate represents the bandwidth in bytes per second (B/s), so just divide the bandwidth required (b/s) by 10 to get B/s. Yes, a byte has 8 bits, but just use 10its easier to calculate and it accounts for the header and footer information used in the TCP/IP (and UDP) protocol.
So, if for example you have 500kb/s upstream bandwidth and want to host for 10 people, each client will use 50kb/s, or 50,000. 50,000 divided by 10 is 5000, so 5000 is your sv_maxrate.
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