ZyXEL Communications IES-1248-51A, User Manual

Page: 497 / 654

Chapter 64 ADSL Commands
IES-1248-51V User’s Guide
497
The following table lists the line diagnostics test parameters that display, see the
ITU-T’s G.992.3 for more information.
Table 189 Line Diagnostics Get Command
LABEL DESCRIPTION
number_of_
subcarries
Discrete Multi-Tone (DMT) modulation divides up a line’s bandwidth
into sub-carriers (sub-channels) of 4.3125 kHz each.
The first number is the total number of DMT sub-carriers the ADSL
connection is using. The second number indicates how many
upstream DMT sub-carriers the ADSL connection is using.
hlinScale:
The channel characteristics function is represented in linear format by
a scale factor and a complex number. These are the maximum
upstream and downstream scale factors used in producing the channel
characteristics function.
latn:
This is the upstream and downstream Line Attenuation (in .1 dB).
satn:
This is the upstream and downstream Signal Attenuation (in .1 dB).
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 IES-1248-51V 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 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 .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).