There are several, but here are three. Others may be spectrum, bandwidth, and time period.
The spectrum of a signal is the range of frequencies contained in the signal. The bandwidth is the difference between the lowest and highest frequency in the spectrum. It is therefore the width of the spectrum and is a measure of the information carrying capacity of the signal.
Frequency of 2000Hz implies a time period of 1/2000 secs , i.e., .5ms. In each time period, a digital signal can signal two bits (look at a figure that illustrates a digital signal). This implies that one bit is signalled every .25ms (i.e., half a time period). This is equivalent to 4000 bps (i.e.,1/.25ms).
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Ramayya Krishnan rk2x@andrew.cmu.edu