As one of these 10 sequences necessarily consists only of either zeros or ones, which yields a quasi continuous wave signal, it can be discarded. This sequence reduction is shown in Fig. 12. In a linear setting, the full eye diagram can be generated by these nine seven-symbol sequences. Of course, as we have a non-linear amplifier, it is not complete, out we have a selection of sequences with the highest possible information content, which renders a large portion of the eye diagram. If the other channel is chosen with the same periodicity (but possibly from another sequence or at least a shifted version of the chosen sequence), the total complex signal is still periodic and therefore has a discrete spectrum. Finally, the data rate and roll-off factor are chosen according to