ZyXEL Communications MSC1000G Series, Руководство пользователя

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Chapter 11 Profile Screens
Management Switch Card User’s Guide
347
The following table describes the labels in this screen.
11.7.4 VDSL2 Line Profile Setup > DPBO
Click the Modify link next to the DPBO field in the VDSL2 Line Profile Setup screen to open the
screen as shown next. Use this screen to configure Downstream Power Back-Off (DPBO) settings.
See
DPBO on page 207 .
Table 162
Profile > VDSL2 > LineProfile > MIB PSD Mask
LABEL DESCRIPTION
MIB PSD Mask This displays the PSD mask result in a graph. The MIB PSD mask is defined only within
the operating bands and lies at or below the limit PSD mask. You may choose not to
specify a MIB PSD mask for one or both transmission directions or in specific bands of
the operating bands.
Preview Click this to display the PSD mask result in the graph you configured at the bottom of
the screen.
DownStream Configure the following settings for the MSC-to-CPEs direction.
UpStream Configure the following settings for the CPEs-to-the-MSC direction.
Break Point This index number identifies each incremental break point.
Tone Index A tone is a sub-channel of VDSL band. DMT divides VDSL bands into many 4.3125 kHz
tones.
Enter an increased number (than previous row) from 0 to 4096 in this field that is also
the horizontal of the
MIB PSD Mask graph.
Frequency (kHz) This read-only field displays a frequency that equals the tone index multiple 4.3125
dBm/Hz. This field automatically calculates after a
Tone Index value is entered.
PSD Level (dBm/Hz) Enter 0~190 to represent 0~-95 dBm/Hz in steps of -0.5dBm/Hz to set the PSD level
for specific tones. This sets the highest transmit PSD level permitted for individual
tones. Your input value will be displayed as the Y-axis of the
MIB PSD Mask graph
after you click Preview .
Modify Click this to save the settings to the MSC and return to the previous screen.
Apply Click Apply to save the changes in this screen to the system’s volatile memory. The
system loses these changes if it is turned off or loses power, so use the Config Save
link on the navigation panel and then the Save button to save your changes to the non-
volatile memory when you are done configuring.
Cancel Click Cancel to reset the fields to your previous configuration.