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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-03
Chapter3 Configuring Cable Modem Interface Features
Configuring the Upstream Cable Modem Interface
To return the automatic upstream frequency adjustment percentage to the default value of 30 percent,
enter the following command in cable interface configuration mode:
Router(config-if)# no cable upstream usport frequency-adjust averaging
Verifying Upstream Frequency Adjustment
To determine if upstream frequency adjustment is configured and activated, enter the
showrunning-config command and look for the cable interface configuration information. If upstream
frequency adjustment is enabled, frequency adjustment entries are displayed in the
showrunning-config output. If frequency adjustments are disabled, no frequency adjustment entry
displays in the output.
Perform these steps if you are having difficulty with verification:
1. Ensure the cable connections are not loose or disconnected
2. Ensure the cable interface line card is firmly seated in its chassis slot.
3. Ensure the captive installation screws are tight.
4. Verify that you have entered the correct slot and port numbers; you selected a valid frequency for
your router.
Activating Upstream Power Adjustment
To enable upstream power adjustment for a specified cable interface, use one of the following commands
in cable interface configuration mode.
To return the automatic upstream power-adjustment ranging value to the default of 2dB, enter the
following command in cable interface configuration mode:
Router(config-if)# no cable upstream usport power-adjust continue
To return the automatic upstream power-adjustment noise value to the default of 30 percent, enter the
following command in cable interface configuration mode:
Command Purpose
Step1
Router(config-if)# cable upstream
usport frequency-adjust averaging
percentage
Set the minimum number of frequency adjustment packets required
to justify changing the upstream frequency adjustment method as a
percentage. Acceptable range is 10 to 100 percent.
Default = 30 percent.
Step2
Router(config-if)# end
Router#
Return to enable (privileged EXEC) mode.
Command Purpose
Router(config-if)# cable upstream
usport power-adjust continue db
Sets the minimum power adjustment in dB that allows
continued ranging status. Valid values are 2to 15dB.
Default = 2dB.
Router(config-if)# cable upstream
usport power-adjust noise percentage
Sets the minimum number (percentage) of
power-adjustment packets required to justify changing the
upstream power rating. Valid values are 10 to 100 percent.
Default = 30 percent.
Router(config-if)# cable upstream 0
power-adjust threshold db
Sets the power-adjustment threshold in dB. Valid values are
0 to 2 dB. Default = 1dB.
Router(config-if)# end
Router#
Returns to enable (privileged EXEC) mode.