Limits of data rate over a wireline channel depend on the channel characteristics, the signaling or modulation scheme, and the complexity one can afford for its implementation. This article compares two signaling schemes, namely baseband and discrete multi-tone (DMT), for two example channels, one with a smooth frequency response and one with a notch frequency response, to examine how far each can push the data rate towards the maximum achievable data rate, derived from Shannon Capacity formula. INDEX TERMS Discrete multi-tone (DMT), pulse amplitude modulation (PAM), quadrature amplitude modulation (QAM), Shannon's capacity, bit loading, salz SNR, integrated crosstalk noise (ICN), insertion loss (IL).

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