ZyXEL Communications VES1724-56 - VDSL Line Profile Setup > Virtual Noise

Chapter 9 VDSL Setup
VES1724-56 User’s Guide
115
9.3.6 VDSL Line Profile Setup > Virtual Noise
Click the Modify link next to the Virtual Noise field in the VDSL Line Profile Setup screen to
open the screen as shown next. Use the screen to configure VDSL virtual noise settings for a VDSL
line profile.
Figure 60 VDSL Virtual Noise Setup
The following table describes the labels in this screen.
Table 39 VDSL Virtual Noise Setup
LABEL DESCRIPTION
Virtual Noise This displays the virtual noise setting result in a graph.
If there is too much noise on a line, the allowed line speed may be reduced or the line may
not initialized. Virtual noise is the noise allowed on the line before the first line speed
adjustment occurs. Switch then uses a lower data rate on tones which you added a noise
level for the line initialization. A lower data rate increases a line’s stability and avoid the
line being easily dropped when actual noise occurs.
Preview Click this to update the virtual noise setting result according to your setting configured at
the bottom of the screen.
Downstream,
Upstream
Select whether you want to enable virtual noise (Enable) or not (Disable) for downstream
and upstream transmissions.
Note: For a poor quality subscriber line, you should enable this and configure virtual noise on
tones where noise may occur.
Note: The higher the virtual noise, the lower the line speed.
Break Point This index number identifies each incremental break point.