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Chapter 47 Diagnostic

IES-1248-51V User’s Guide

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47.4 ToneDiag Parameters

The following table lists the tone diagnostic parameters that display, see the ITU-

T’s G.992.3 for more information.

Table 125 ToneDiag Parameters

LABEL DESCRIPTION

number_of_

subcarries

Discrete Multi-Tone (DMT) modulation divides up a line’s bandwidth

into sub-carriers (sub-channels) of 4.3125 KHz each.

This number indicates how many upstream and downstream DMT

sub-carriers the ADSL connection is using.

hlinScale: The channel characteristics function is represented in linear format by

a scale factor and a complex number. This is the maximum upstream

and downstream scale factor 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).

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 and the received noise power. The signal-to-noise ratio

margin is the maximum that the received noise power could increase

with the IES-1248-51V 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.

logdB) This is a format for providing channel characteristics. It provides

magnitude values in a logarithmic scale. This can be used in analyzing

the physical condition of the ADSL line.

QLN(dBm) The Quiet Line Noise for a DMT sub-carrier is the rms (root mean

square) level of the noise present on the line, when no ADSL signals

are present. It is measured in dBm/Hz. The QLN can be used in

analyzing crosstalk.

SNR(dB) This is the upstream and downstream Signal-to-Noise Ratio (in dB). A

DMT sub-carrier’s SNR is the ratio between the received signal power

and the received noise power. The SNR can be used in analyzing time

dependent changes in crosstalk levels and line attenuation (such as

those caused by temperature variations and moisture).

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