133
Discrete Mul
t
i-Tone(DMT) modulation divides up a line’s band
w
idth intosub-
carriers (sub-channels) of 4.3125 KHz each.
The first number is the total number of DMT sub-carriers the ADSL connection is
using. The second number indicates how many upstream DMT sub-carriers the
ADSL connection is using.
The channel characteristics function is represented i n linear format by a scale
factor and a complex number. These are the maximum upstream and
downstream scale factors used in producing the channel characteristics function.
latn This is the upstream and downstream Line Attenuation (in dB).
satn This is the upstream and downstream Signal Attenuation (in dB).
MSAP2000 AAMS User’s Guide
21.3 Line Diagnostics Test Parameters

The following table lists the line diagnostics test parameters that display, see the

ITU-Tís

G.992.3 for more information.

Table 55 Line Diagnostics Test Parameters
LABEL DESCRIPTION
number_of_
subcarries

hlinScale

snrm This is the upstream and downstream Signal-to-Noise Ratio Margin (in dB). A
DMT sub-carrier’s SNR is the ratio between the received signal power a nd the
received noise power. The signal-to-noise ratio margin is the maximum that the
received noise power could increase with the MSAP2000 AAMS still being able to
meet its transmission targets
attndr This is the upstream and downstream Attainable Net Data Rate (in bit/s).
farEndActatp This is the upstream and downstream Far End Actual Aggregate Transmit Power
(in dBm)
i This is the index number of the DMT sub-carrier.
li.rl The channel characteristics function is represented i n linear format by a scale
factor and a complex number. This is the real part of the complex number
used in producing the channel characteristics function for this sub-carrier.
li.im The channel characteristics function is represented in linear format by a scale
factor and a complex number. This is the imaginary part of the complex number
used in producing the channel characteristics function for this sub-c arrier.