Monitoring The Snr-Margin; Manually Forcing Retraining - HP ProCurve 7000dl Series Basic Management And Configuration Manual

ADSL WAN Connections
ADSL Modules for the ProCurve Secure Router
7-16
Determining the minimum SNR margin is a compromise: the higher the SNR
margin, the slower the transmission rate. However, if you set the SNR margin
too low, the line may go down, or your data may be garbled.
To set the SNR margin, enter the following command from the ADSL config-
uration mode context:
Syntax: snr-margin <margin>
Replace <margin> with a number between 1 and 15 decibels (db).
For example, if you want to set the SNR margin to 4, enter:
ProCurve(config-adsl 2/1)# snr-margin 4

Monitoring the SNR-Margin

You can enable monitors to ensure that the minimum SNR is maintained on
the line during both the ADSL training and the ADSL showtime phases. These
monitors periodically check the line to ensure that the SNR margin does not
fall below your setting.
To enable the monitors, enter the following command from the ADSL config-
uration mode context:
Syntax: snr-margin [showtime-monitor | training-monitor]
For example, to enable the showtime monitor, enter:
ProCurve(config-adsl 2/1)# snr-margin showtime-monitor

Manually Forcing Retraining

After you configure the ADSL interface options, you can force the ADSL
interface to retrain itself. From the ADSL interface configuration mode context,
enter:
ProCurve(config-adsl 2/1)# retrain
When the line reaches an acceptable SNR margin, its status will change to up.