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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 th e
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).