ZyXEL Communications MSC1000G User Manual page 452

Chapter 12 Statistics Screens
The following table describes the labels in this screen.
Table 214 Port Statistics: DSL Line Card: Status
LABEL
Items
End
Show Graph
452
DESCRIPTION
Select an item from the drop-down list box to display the status. The available
options vary depending on the line card type.
For the VLC14xx line cards:
• band: Displays the band plan used and each band's status which includes SNR
margin, line attenuation, signal attenuation, transmit power, and receive power.
• medleypsd: Displays the final PSD the system proposes to the connected CPE
during line initialization, which contains a set of breakpoints.
• bitalloc: Displays bits allocation per tone.
• hlog: Displays the loop response using a logarithmic scale. These values can then
be used to estimate line characteristics such as the line make-up and length.
• qln: Displays the Quiet Line Noise level on a line. This is the rms (root mean
square) level of the noise present on the line for a DMT tone when no ADSL or
DSL signals are present. It is measured in dBm/Hz. The QLN can be used in
analyzing crosstalk.
• snr: Displays the signal-to-noise ratio measured per tone.
For the VLC13xx line cards:
• linebandplan: Displays the band plan used.
• linedata: Displays the DSL line bit allocation.
• linegain: Displays the line gain of the active ADSL line. Line gain represents the
signal input required to compensate for losses in signal strength at different
frequencies.
• linehlog: This command displays the loop response using a logarithmic scale.
These values can then be used to estimate line characteristics such as the line
make-up and length.
• lineqln: Displays the Quiet Line Noise level on a line. This is the rms (root mean
square) level of the noise present on the line for a DMT tone when no ADSL or
DSL signals are present. It is measured in dBm/Hz. The QLN can be used in
analyzing crosstalk.
• linesnr: Displays the signal-to-noise ratio measured per tone.
• linetssi: Displays the TSSI (Transmitter Spectrum Shape Index) of transmission
on the specified DSL line. This tests the variation of the actual PSD (Power
Spectrum Density) from the specified PSD.
• resultmask: Displays the resultant PSD mask this line uses.
For the ALC line cards:
• linedata: Displays an ADSL port's line bit allocation.
• linegain: Displays the line gain of the active ADSL line. Line gain represents the
signal input required to compensate for losses in signal strength at different
frequencies.
• linehlog: This command displays the loop response using a logarithmic scale.
These values can then be used to estimate line characteristics such as the line
make-up and length.
• lineqln: Displays the Quiet Line Noise level on a line. This is the rms (root mean
square) level of the noise present on the line for a DMT tone when no ADSL or
DSL signals are present. It is measured in dBm/Hz. The QLN can be used in
analyzing crosstalk.
• linetssi: Displays the TSSI (Transmitter Spectrum Shape Index) of transmission
on the specified DSL line. This tests the variation of the actual PSD (Power
Spectrum Density) from the specified PSD.
Select Near to display results for the upstream traffic (coming from the subscriber to
the line card).
Select Far to display results for the downstream traffic (going from the line card to
the subscriber).
Click this to display the line information as a line graph.
Management Switch Card User's Guide