ZyXEL VES1724-56 User Guide - Page 65

VDSL sub-carrier status

Page 65 highlights

Chapter 7 System Status and Port Statistics Table 7 Status: VDSL Port Details (continued) LABEL Items Direction Display Show Measure MEDLEY PSD Break Point Tone Index PSD Level Poll Interval(s) Stop DESCRIPTION Select Hlog (Channel Transfer Function) to see the line's capability against interference and attenuation. Select QLN (Quiet Line Noise) to see the line's noise level. Select SNR (Signal-to-Noise-Ratio) to see the line's signal strength level. Select BitAlloc to display the number of bits allocated to each tone. The higher the bit allocated, the higher the data transmission rate. Select GainAlloc to display the gain allocated to each tone. Normally, each tone gets a different gain value allocated to avoid interference. Select Downstream or Upstream for the direction. Select Both for both downstream and upstream directions. Select Graph or Text to display the graph or statistic data of the VDSL sub-carrier status. This field is not configurable and the Switch only displays the status in a graph when you select Both in the Direction field. Select the criteria above and click Show to display a screen where displays you port detail information in raw data or in a graph. Click Measure to display the latest VDSL port details in this screen. This section displays the final PSD the Switch proposes to the connected CPE during line initialization. This field displays the index number for each incremental break point. This field displays the corresponding tone according to the specified break point. A tone is a sub-channel of a VDSL band. DMT divides VDSL bands into many 4.3125 kHz tones. This field displays the final PSD level the Switch proposes for the specified tone. The text box displays how often (in seconds) this screen refreshes. You may change the refresh interval by typing a new number in the text box and then clicking Set Interval. Click Stop to stop refreshing this screen. The following figures show you examples of each graph type that can be displayed when you click Show in the VDSL sub-carrier status section. Downstream information is in blue and upstream in red. VES1724-56 User's Guide 65

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Chapter 7 System Status and Port Statistics
VES1724-56 User’s Guide
65
The following figures show you examples of each graph type that can be displayed when you click
Show
in the
VDSL sub-carrier status
section. Downstream information is in blue and upstream
in red.
Items
Select
Hlog
(Channel Transfer Function) to see the line’s capability against interference
and attenuation.
Select
QLN
(Quiet Line Noise) to see the line’s noise level.
Select
SNR
(Signal-to-Noise-Ratio) to see the line’s signal strength level.
Select
BitAlloc
to display the number of bits allocated to each tone. The higher the bit
allocated, the higher the data transmission rate.
Select
GainAlloc
to display the gain allocated to each tone. Normally, each tone gets a
different gain value allocated to avoid interference.
Direction
Select
Downstream
or
Upstream
for the direction. Select
Both
for both downstream
and upstream directions.
Display
Select
Graph
or
Text
to display the graph or statistic data of the VDSL sub-carrier
status. This field is not configurable and the Switch only displays the status in a graph
when you select
Both
in the
Direction
field.
Show
Select the criteria above and click
Show
to display a screen where displays you port
detail information in raw data or in a graph.
Measure
Click
Measure
to display the latest VDSL port details in this screen.
MEDLEY PSD
This section displays the final PSD the Switch proposes to the connected CPE during line
initialization.
Break Point
This field displays the index number for each incremental break point.
Tone Index
This field displays the corresponding tone according to the specified break point.
A tone is a sub-channel of a VDSL band. DMT divides VDSL bands into many 4.3125 kHz
tones.
PSD Level
This field displays the final PSD level the Switch proposes for the specified tone.
Poll Interval(s)
The text box displays how often (in seconds) this screen refreshes. You may change the
refresh interval by typing a new number in the text box and then clicking
Set Interval
.
Stop
Click
Stop
to stop refreshing this screen.
Table 7
Status: VDSL Port Details (continued)
LABEL
DESCRIPTION