Tonediag Parameters; Table 67 Tonediag Parameters - ZyXEL Communications IES-1248-51 User Manual

IES-1248-51 User's Guide
Table 66 LDM Test Parameters (continued)
LABEL
QLN
SNR

35.4 ToneDiag Parameters

The following table lists the tone diagnostic parameters that display, see the ITU-T's G.992.3
for more information.

Table 67 ToneDiag Parameters

LABEL
number_of_
subcarries
hlinScale:
latn:
satn:
snrm:
attndr:
farEndActatp:
i
logdB)
QLN(dBm)
SNR(dB)
220
DESCRIPTION
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.
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).
DESCRIPTION
Discrete Multi-Tone (DMT) modulation divides up a line's bandwidth into sub-
carriers (sub-channels) of 4.3125 KHz each.
This number indicates how many upstream and downstream DMT sub-carriers
the ADSL connection is using.
The channel characteristics function is represented in linear format by a scale
factor and a complex number. This is the maximum upstream and downstream
scale factor used in producing the channel characteristics function.
This is the upstream and downstream Line Attenuation (in dB).
This is the upstream and downstream Signal Attenuation (in dB).
This is the upstream and downstream Signal-to-Noise Ratio Margin (in 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-1248-51 still being able to
meet its transmission targets.
This is the upstream and downstream Attainable Net Data Rate (in bit/s).
This is the upstream and downstream Far End Actual Aggregate Transmit
Power (in dBm)
This is the index number of the DMT sub-carrier.
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.
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.
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).
Chapter 35 Diagnostic