A SERVICE OF

logo

134
MSAP2000 AAMS User’s Guide
Table 55 Line Diagnostics Test Parameters
LABEL DESCRIPTION
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).