AAM1212 User’s Guide
Chapter 22 Diagnostic
161
log
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
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
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).
Table 55
Line Diagnostics Test Parameters
LABEL
DESCRIPTION
Содержание AAM1212
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