C
ONFIGURING
G
LOBAL
S
ETTINGS
FOR
VDSL P
ORTS
10-3
the optimal transmission rate for the current conditions, setting the rate
within the bounds defined by the Data Rate.
When rate adaptation is enabled and the signal quality deteriorates on
any line or the link is re-established after being dropped, that port will
automatically enter retraining and connect at the optimum rate if
Auto-retraining is enabled (described later in this section). Otherwise,
the rate can be manually retrained (see the description for Retraining
under “Configuring Interface Settings for VDSL Ports” on page 10-7).
•Rate Set – Sets the maximum input and output data rates for the VDSL
ports. (Range: 1-200,000 kbps; Default: Based on Auto-retraining if
enabled, otherwise undefined)
•Auto-retraining – Initiates the rate adaption method to find the optimal
transmission rate based on existing line conditions. (Default: Enabled)
When auto-retraining is enabled and signal quality deteriorates on any
line, that port will automatically enter retraining and connect at the
optimum rate based on the bounds defined by the Date Rate defined
for each VDSL port (see “Configuring Interface Settings for VDSL
Ports” on page 10-7).
•UPBO Configuration – Sets a mask to reduce the power spectral
density (PSD) of transmitted signals at specified frequency breakpoint s
for upstream power backoff.
-K1[0-5] – Frequency breakpoints for upstream bands DS 1-DS3.
-K2[0-5] – Frequency breakpoints for downstream bands US0-US2.
-Value – Limitation on the PSD at specified breakpoint.
(Range: -1000000 to 1000000, in units of 1000 x decibel; Defaults:
K1[0] 0 K1[1] -60000 K1[2] -60000 K1[3] -60000 K1[4] 0 K1[5] 0
K2[0] 0 K2[1] -11200 K2[2] -7419 K2[3] -7419 K2[4] 0 K2[5] 0)
The PSD values specified are in units of 1000 x decibel (dB). For
example, 60000 means 60.0 dB. The actual power levels implemented
are in milliwatts per Hertz (dBm/Hz). For example, you would enter
-60000 with this command to specify a value of -60 dBm/Hz.