user manual

Configuring Headend Broadband Access Router Features
Configuring the Upstream Cable Interface
MC-556
Cisco IOS Multiservice Applications Configuration Guide
Verifying Upstream Frequency Adjustment
To verify whether or not upstream frequency adjustment has been 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 will be displayed in the show
running-config output. If frequency adjustments have been disabled, no frequency adjustment entry will
be displayed in the output.
Troubleshooting Tips
To troubleshoot the configuration, perform the following tasks:
• Make sure the cable connections are not loose or disconnected.
• Make sure the Cisco cable modem card is firmly seated in its chassis slot and the captive installation
screws are tight.
• Make sure you entered the correct slot and port numbers when you typed the command.
• Make sure you entered the correct upstream port number:
– On the MC16C cable modem card, this can be u0 to u5.
– On the MC14C cable modem card, this can be u0 to u3.
– On the MC12C cable modem card, this can be u0 or u1.
– On the MC11C cable modem card, this can be u0 only.
Activating Upstream Power Adjustment
To enable upstream power adjustment for a specified cable interface, use 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
Command Purpose
Step 1
CMTS01(config-if)# cable upstream usport
power-adjust continue db
Sets the minimum power adjustment in dB that will
allow continued ranging status. Valid values are 2 to
15 dB. Default = 2 dB.
Step 2
CMTS01(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.
Step 3
CMTS01(config-if)# cable upstream 0 power-adjust
threshold db
Sets the power adjustment threshold in dB. Valid
values are 0 to 2 dB. Default = 1 dB.
Step 4
CMTS01(config-if)# end CMTS01#
Returns to enable (privileged EXEC) mode.