In this work, we consider the potential of discrete multitone (DMT) signalling for wireline communication beyond 100 Gb/s. Using a behavioural model of a DMT link, a spectral efficiency of 2.5 bits/sample is achievable over an IEEE P802.3ck channel with 18 dB loss at 40 GHz, affording an aggregate data rate of 200 Gb/s at 80 GS/s with 150 fs of jitter and 1.26 mV of noise at the input to the receiver. Significant improvement in bit error rate (BER) is obtained by increasing digital-to-analog converter (DAC) resolution to 8 bits.