AAM1212 User’s Guide
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Chapter 8 ADSL Port Setup
Discrete Multi-Tone (DMT) modulation divides up a line's bandwidth into tones. This screen
displays the number of bits transmitted for each tone. This can be used to determine the quality
of the connection, whether a given sub-carrier loop has sufficient margins to support ADSL
transmission rates, and possibly to determine whether certain specific types of interference or
line attenuation exist. Refer to the ITU-T G.992.1 recommendation for more information on
DMT.
The better (or shorter) the line, the higher the number of bits transmitted for a DMT tone. The
maximum number of bits that can be transmitted per DMT tone is 15.
The bit allocation contents are only valid when the link is up.
In the screen shown, the downstream channel is carried on tones 48 to 255 and the upstream
channel is carried on tones 16 to 31 (space is left between the channels to avoid interference).
Figure 54
Line Data
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