The signal to noise ratio for a voice grade line is 30.1 dB (decibels) or a power ratio of 1023:1. The maximum achievable data rate on this line whose spectrum ranges from 300 Hz to 4300 Hz is
A. 6200 bps
B. 9600 bps
C. 34000 bps
D. 31000 bps
E. None of the above
Answer: Option D
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Can you explain please
aximum bit rate = Bandwidth*log(1+S/N).
Log base is not said. So taken as 2.
S/n = 1023/1.
Bw = 4300-300.
Maximum bit rate = 4000*log(1 = 1023).
= 4000*10 = 40000 bps.
So the answer will be none of this.