L
ONG
-R
EACH
E
THERNET
C
OMMANDS
29-13
PSD Mask required for compliance with local regulations, or set 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.
• Breakpoints can be applied to any upstream or downstream channel
depending on the associated frequencies.
Example
The following sets 25 breakpoints on VDSL port 1. This al lows five
breakpoints to be set for each of DS1, US1, DS2, US2 and DS3 upstream
and downstream channels. This would allow you to set a steep slope at the
channel bounds, as well as a small peak toward the center of the band.
Related Commands
lre psd-frequencies (29-13)
lre psd-value (29-15)
show lre psd (29-67)
lre psd-mask-level (29-16)
lre psd-frequencies
This command maps a frequency to each breakpoint in the PSD mask. Use
the no form to restore the default setting.
Syntax
lre psd-frequencies breakpoint frequency
•breakpoint – One of the breakpoints defined by the lre
psd-breakpoints command (page 29-12).
•frequency – A frequency assigned to the corresponding breakpoint.
(Range: 0-30000 kHz)
Default Setting
none
Console(config)#interface ethernet 1/1
Console(config-if)#lre psd-breakpoint 25
Console(config-if)#