Installation guide

3-19
Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 3 Configuring the Cisco Cable Interface
Configuring the Upstream Cable Interface
Verifying Upstream Frequency Adjustment
To determine if upstream frequency adjustment is configured and activated, enter the
show running-config command and look for the cable interface configuration information. If upstream
frequency adjustment is enabled, frequency adjustment entries are displayed in the
show running-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 modem 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 2 dB, enter the
following command in cable interface configuration mode:
CMTS01(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:
CMTS01(config-if)# no cable upstream usport power-adjust noise
To return the upstream power adjustment threshold value to the default of 1 dB, enter the following
command in cable interface configuration mode:
CMTS01(config-if)# no cable upstream usport power-adjust threshold
Command Purpose
CMTS01(config-if)# cable upstream usport
power-adjust continue db
Set the minimum power adjustment in dB
that allows continued ranging status. Valid
values are 2 to 15 dB. Default = 2 dB.
CMTS01(config-if)# cable upstream usport
power-adjust noise percentage
Set 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.
CMTS01(config-if)# cable upstream 0 power-adjust
threshold db
Set the power adjustment threshold in dB.
Valid values are 0 to 2 dB. Default = 1 dB.
CMTS01(config-if)# end
CMTS01#
Return to enable (privileged EXEC) mode.