C = 2* B * log2(M)
Where
B = bandwidth (Hz)
C = data transfer rate (bps)
M = levels (eg can detect 2 voltage levels)
eg 2-level signal (1 or 0) over 3000 Hz line.
C = 2* 3000 * log2(2)
= 6000 * 1
= 6000 bps
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