ZyXEL Communications MSAP2000 Aams User’s Guide Line Diagnostics Test Parameters, Qln, Snr

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).

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