SMC Networks TigerAccess SMC7816M - Manual (Page 702)

VDSL C
OMMANDS
29-20
Command Usage
• Enter this command in global configuration mode to enable upstream
power backoff for all VDSL ports, or in interface mode to enable it for
a VDSL port.
• Upstream power backoff (UPBO) should be configured when there
are VDSL connections of different lengths attached to this switch.
UPBO is required to improve the spectral compatibility on lines of
different lengths by reducing the transmitted power on shorter lines.
If UPBO is enabled by this command, and a PBO mask has been
defined, the transceiver will use the PBO mask.
• This command will apply the upstream power backoff PSD mask to
the specified ports based on configuration settings specified with the
lre pbo-config command (page 29-18) as described in ITU-T
G.992.2. If UPBO is enabled, but a PBO mask has not been
configured, the specified transceiver will automatically control
upstream power backoff based on default values set by the DSP
engine.
Example
This example enables upstream power backoff on port 1.
Related Commands
show lre upbo (29-70)
lre pbo-config (29-18)
Console(config)interface ethernet 1/1#
Console(config-if)#lre upbo
Console(config-if)#