VDSL C
OMMANDS
29-14
Command Mode
Global Configuration
Interface Configuration (VDSL Port)
Command Usage
• Enter this command in global configuration mode to configure
frequency breakpoints for all VDSL ports, or in interface mode to
configure them for a specific VDSL port.
• The number of breakpoints used in the PSD mask is specified with the
lre psd-breakpoints command (page 29-12), while the power level
set for each breakpoint is defined by the lre psd-value command
(page29-15). These PSD commands are used to create a PSD mask
for in-bank spectrum shaping, setting the Limit PSD Mask required
for compliance with local regulations, or setting mask limits for
upstream power backoff. The methods used to calculate these various
PSD masks, and local regulations governing the power spectrum used
on VDSL lines are all described in ITU-T G.993.2.
Example
The following sets breakpoint frequencies for US1 to create a slope at the
channel bounds, and peak at the center of the band.
Related Commands
lre psd-breakpoints (29-12)
lre psd-value (29-15)
show lre psd (29-67)
lre psd-mask-level (29-16)
Console(config)#interface ethernet 1/1
Console(config-if)#lre psd-frequencies 1 3750
Console(config-if)#lre psd-frequencies 2 3900
Console(config-if)#lre psd-frequencies 3 4475
Console(config-if)#lre psd-frequencies 4 5050
Console(config-if)#lre psd-frequencies 5 5200
Console(config-if)#