The Shannon-Hartley law example

The Shannon-Hartley law example

by Natalia Nessler -
Number of replies: 2

Hello,

There is an example in the lecture 1 (archi), slide 22. When I plug in the constants, I don't get the same result. 

If I understand it correctly, the SNR inside the log is not 45dB, because dB means we already took a 10log. So for me C = B log(1 + 2^(4.5)) = 4.56, but even if I simply plug 45 in the log, it still doesn't give me 15 Mbs. 

What am I doing wrong? :)