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In simple terms:
symbol rate has to do with how much bandwidth is being used by a channel/mux. Lower the symbol rate, less bandwidth and lesser the quality might be (if you are trying to fit 2-3 channels into low bandwidth/sr picture quality might not be all that great). You also have FEC which plays into the equation as to how errors should be dealt with.
The formula actually looks like this (this only applies to dvb qpsk):
symbol rate = (bandwidth / (2.0 * FEC)) * (204.0 / 188.0)
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