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2. Carrierless amplitude phase modulation - Wikipedia

   en.wikipedia.org/wiki/Carrierless_amplitude...

   [2] [4] [5] For ADSL deployments CAP was the de facto standard up until 1996, deployed in 90 percent [citation needed] of ADSL installs. The standardized variants of ADSL, ANSI T1.413 Issue 2 and G.dmt , as well as the successors ADSL2 , ADSL2+ , VDSL2 , and G.fast , do not specify CAP, but rather discrete multi-tone (DMT) modulation.

3. ANSI T1.413 Issue 2 - Wikipedia

   en.wikipedia.org/wiki/ANSI_T1.413_Issue_2

   It defines the minimum requirements for satisfactory performance of ADSL systems using the Discrete Multi-Tone (DMT) line code. DMT divides the useful bandwidth of the standard two wire copper medium used in the public switched telephone network (PSTN), which is 0 to 1104 kHz, into 256 separate 4.3125 kHz wide frequency bands called sub-carriers.

4. G.992.1 - Wikipedia

   en.wikipedia.org/wiki/G.992.1

   In telecommunications, ITU-T G.992.1 (better known as G.dmt) is an ITU standard for ADSL using discrete multitone modulation (DMT). G.dmt full-rate ADSL expands the usable bandwidth of existing copper telephone lines, delivering high-speed data communications at rates up to 8 Mbit/s downstream and 1.3 Mbit/s upstream. [1]

5. ADSL - Wikipedia

   en.wikipedia.org/wiki/ADSL

   ADSL initially existed in two versions (similar to VDSL), namely CAP and DMT. CAP was the de facto standard for ADSL deployments up until 1996, deployed in 90 percent of ADSL installations at the time. However, DMT was chosen for the first ITU-T ADSL standards, G.992.1 and G.992.2 (also called G.dmt and G.lite respectively). Therefore, all ...

6. G.992.3 Annex L - Wikipedia

   en.wikipedia.org/wiki/G.992.3_Annex_L

   Tones are spaced apart by 4.3125kHz. In the Annex A, L and M frequency standards, POTS (analog PSTN voice) occupies (what would be) tones 0-3, tones 4-7 are reserved for a ‘guard band’, and the upstream DSL transmission band uses tones 8-31 in Annex A and L, or 8-56 in Annex M. In Annex B, ISDN occupies tones 0-31, DSL upstream uses tones ...

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   getonline.aol.com/dialup

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