Refers to a version of multicarrier modulation in which incoming data is collected and then distributed over a large number of small, individual carriers. DMT creates these channels using a digital technique known as Discrete Fast-Fourier Transform. DMT is the basis of ANSI Standard T1.413.
Most common DSL modulation method. DMT creates 256 channels across the usable frequency spectrum. Each channel measures 4.3125KHz wide. Dividing the spectrum into channels allows DMT to function well in spite of nearby AM radio transmitters. The DMT modulator and demodulator is the FFT (Fast Fourier Transform) algorithm. Inside each channel, the modulation technique is QAM. Within each channel, the number of bits per symbol may be independently selected. Independent selection allows a DMT modem to be rate adaptive. Both G.DMT and G.Lite use DMT.
Discrete Multitone (modulation)
Discrete Multitone Technology. This is a line encoding common among ADSL deployments, and now is the standard. Sometimes referred to as "Alcatel compatible". Most telcos in the U.S. are now standardizing on DMT. The other, less common, ADSL encoding is "CAP". CAP and DMT modems are incompatible with each other.
Discrete Multitone Transmission, as used for FasTrak DSL service from Pacific Bell. See also g.lite and ADSL
Discrete MultiTone. DSL technology using digital signal processors to divide the signal into 256 subchannels.
A multicarrier modulation scheme used in ADSL.