Higher Performance A DMT modem has shown in theory and practice that it can provide higher performance than a modem based on traditional SCM. Fig. 1 and 2 compare the throughput analysis of DMT and SCM in the presence of FEXT (far end crosstalk, the most common form of noise in VDSL.) This analysis was done using the assumptions in Table 1. Margin and throughput enhancements of DMT over SCM are...