Before looking more into the rate and reach this example problem, a definition of the terms pre-emphasis and de-emphasis will be presented.  Both are transmit side equalization techniques and yield similar results.  Pre-emphasis (Pre-E/PE) boosts the high frequency component of the signal, common with LVDS interfaces.  The normal IOD (output differential current) is 3.5 mA.  For the transition to a new state, additional current is driven to over drive the signal.  For the 101 signal pattern, shown here, it can be seen that there is an increased drive and signal swing, thus boosting the high frequency component.  If the state of the next bit is the same, then the additional boost current is turned off and the normal signal swing is seen (see the pattern of 1s on the left). De-emphasis (De-E/DE) cuts back on the low frequency component of the transmitted signal, common with CML interfaces.  On a transition, the full swing is driven and if the logic state is the same, then the amount of current is cut back, thereby de-emphasizing the low frequency content of the signal.  The plot on the right shows a De-E waveform for a 1100 pattern.  The amount of equalization is calculated by the equations provided.