ZyXEL Communications AAM1212-51, User Manual

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AAM1212-51/53 Series User’s Guide
370 Chapter 52 ADSL Commands
52.2.9 Line Diagnostics Get 992.3 Command
Syntax:
ras> adsl linediag getld992_3 <port number>
Use this command to display the line diagnostics results in the format defined in the ITU-T
G.992.3 standard after using the line diagnostics set command on a DSL port. Use the line
diagnostics results to analyze problems with the physical DSL line.
Note: Wait at least one minute after using the line diagnostic set command before
using this command.
snrm:
This is the upstream and downstream Signal-to-Noise Ratio Margin (in .1 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 AAM1212 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 .1 dBm)
i
This is the index number of the DMT sub-carrier.
li.rl
The channel characteristics function is represented in linear format by a scale
factor and a complex number. This is the real part of the complex number used
in producing the channel characteristics function for this sub-carrier.
li.im
The channel characteristics function is represented in linear format by a scale
factor and a complex number. This is the imaginary part of the complex number
used in producing the channel characteristics function for this sub-carrier
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 DSL 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 DSL 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 .1 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 96 Line Diagnostics Get Command (continued)
LABEL DESCRIPTION