R0106-HP MSR Router Series Interface Command Reference(V7)

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Default
An EFM interface automatically tunes its transmission power.
Views
EFM SHDSL_8WIRE_BIS interface view
Predefined user roles
network-admin
Parameters
auto: Automatically tunes the transmission power.
value: Specifies a PBO value (in dB) to restrict the transmission power. The value range is 0 to 31.
Usage guidelines
An EFM interface automatically tunes its transmission power according to the line noise to ensure an
appropriate signal-to-noise ratio. When the line noise is known or the automatically-tuned value is
inaccurate, use this command to manually tune the transmission power.
Examples
# Tune the transmission power of interface EFM 2/4/0 to 20 dB.
<Sysname> system-view
[Sysname] interface efm 2/4/0
[Sysname-EFM2/4/0] shdsl pbo 20
shdsl psd
Use shdsl psd to set the PSD mode for an EFM interface.
Use undo shdsl psd to restore the default.
Syntax
shdsl psd { asymmetry | symmetry }
undo shdsl psd
Default
The PSD of the interface is in symmetric mode.
Views
EFM SHDSL_8WIRE_BIS interface view
Predefined user roles
network-admin
Parameters
asymmetry: Specifies the asymmetric mode.
symmetry: Specifies the symmetric mode.
Usage guidelines
PSD is the amount of power per unit (density) of frequency (spectral) as a function of the frequency. PSD
describes how the power of a time series is distributed with frequency.