Required Signal to Noise Ratio for 56Kbps

• Assuming a bandwidth of 3800 hz (from 200 hz to 4Khz), the required SNR is (from Shannon’s theorem):

bps = BW log2 (1 + P/N)

bps = BW log2 (1 + 10 SNR/10)

SNR = 10 log (2 bps/BW -1)

SNR > 44.36 dB

• This is very achievable on real lines.

Previous slide

Next slide

Back to first slide

View graphic version