Full rate standard:

G.dmt = ITU G.992.1 = ANSI T1.413, Iss.2
Downstream (DS): 64 kbps - 8.192 Mbps
Upstream (US): 16 kbps - 768 kbps

"Splitterless", low power standard:

G.lite = ITU G.992.2
DS: 64 kbps - 1.5 Mbps
US: 16 kbps - 368 kbps

Bandwidths

POTS: 300 Hz to 3.4 kHz
ISDN to 70 kHz (2B1Q) 140 kHz (4B3T)
G.dmt US: 25 kHz to 138 kHz (7 to 31 DMT tones)
G.dmt DS: 138 kHz to 1.1 MHz (FDM, 32 - 255 DMT tones)
25 kHz to 1.1 MHz (Echo Cancellation, 7 - 255 DMT tones)
G.lite US: 25 kHz to 138 kHz
G.lite DS: 138 kHz to 550 kHz

There are a total of 256 DMT tones, separated by 4.3125 kHz, each with a different centre frequency, fc. Since the POTS channel resides at the lower end of this spectrum, only tones 7 -255 are available. For full-rate ADSL, the downstream uses DMT tones 7 - 255 (echo cancellation) or 32 - 255 (FDM). The upstream channel uses tones 7 - 31. Bit-loading is adaptive and varies from 2 to 15 bits per tone (subchannel) depending on the relative noise of each carrier. When high noise levels are detected in a given subchannel, the DMT modem can shut down a particular subchannel altogether.

For the reduced bandwidth of G.lite, there are a total of 128 DMT tones. The downstream channel uses 7 - 128 tones and the upstream, 7 - 32. Bit-loading varies from 2 to 8 bits per symbol.

Source:FUJITSU