Cisco Systems uBR7200 manual Activating Upstream Power Adjustment, MC-556

Configuring Headend Broadband Access Router Features

Configuring the Upstream Cable Interface

Verifying Upstream Frequency Adjustment

To verify whether or not upstream frequency adjustment has been configured and activated, enter the show running-configcommand and look for the cable interface configuration information. If upstream frequency adjustment is enabled, frequency adjustment entries will be displayed in the show running-configoutput. 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:

	Command	Purpose
Step 1
	CMTS01(config-if)# cable upstream usport	Sets the minimum power adjustment in dB that will
	power-adjust continue db	allow continued ranging status. Valid values are 2 to
		15 dB. Default = 2 dB.
Step 2
	CMTS01(config-if)# cable upstream usport	Sets the minimum number (percentage) of power
	power-adjust noise percentage	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	Sets the power adjustment threshold in dB. Valid
	threshold db	values are 0 to 2 dB. Default = 1 dB.
Step 4
	CMTS01(config-if)# end CMTS01#	Returns to enable (privileged EXEC) 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

Cisco IOS Multiservice Applications Configuration Guide

MC-556