This definition of <i>bandwidth</i> is in contrast to the field of <a href='http://en.wikipedia.org/wiki/Signal_processing' target='_blank' rel='nofollow'>http://en.wikipedia.org/wiki/Signal_processing</a>, <a href='http://en.wikipedia.org/wiki/Wireless_communications' target='_blank' rel='nofollow'>http://en.wikipedia.org/wiki/Wireless_communications</a>, <a href='http://en.wikipedia.org/wiki/Modem' target='_blank' rel='nofollow'>http://en.wikipedia.org/wiki/Modem</a> <a href='http://en.wikipedia.org/wiki/Data_transmission' target='_blank' rel='nofollow'>http://en.wikipedia.org/wiki/Data_transmission</a>, <a href='http://en.wikipedia.org/wiki/Digital_communications' target='_blank' rel='nofollow'>http://en.wikipedia.org/wiki/Digital_communications</a>, and <a href='http://en.wikipedia.org/wiki/Electronics' target='_blank' rel='nofollow'>http://en.wikipedia.org/wiki/Electronics</a>, in which <i>bandwidth</i> is used to refer to analog <a href='http://en.wikipedia.org/wiki/Signal_bandwidth' target='_blank' rel='nofollow'>http://en.wikipedia.org/wiki/Signal_bandwidth</a> measured in <a href='http://en.wikipedia.org/wiki/Hertz' target='_blank' rel='nofollow'>http://en.wikipedia.org/wiki/Hertz</a>, meaning the frequency range between lowest and highest attainable frequency while meeting a well-defined impairment level in signal power. The connection to the computing term is that, according to <a href='http://en.wikipedia.org/wiki/Hartley%27s_law' target='_blank' rel='nofollow'>http://en.wikipedia.org/wiki/Hartley%27s_law</a>, the digital data rate limit, or <a href='http://en.wikipedia.org/wiki/Channel_capacity' target='_blank' rel='nofollow'>http://en.wikipedia.org/wiki/Channel_capacity</a>, <b><u>of</u></b> a physical communication link is proportional to its bandwidth in hertz.<br/><br/>I'd like to know what role "of" plays in my example.<br/>Thank you in advance for your help.