title: What limits data rate through a medium keep on increasing?
body: <p>We know data rate is bits per second. It can be also considered as baud rate(symbols per second) times the number of bits in symbol. So, if to increase data rate, we can increase baud rate or we can increase number of bits in a symbol. Why can't we keep on increasing these two? Can someone explain what happens with these 2 occasions separately?</p>