Cisco Systems uBR7200 Activating Upstream Timing Adjustment, Verifying Upstream Power Adjustment

Configuring Headend Broadband Access Router Features

Configuring the Upstream Cable Interface

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

Verifying Upstream Power Adjustment

To verify whether or not upstream power adjustment has been configured and activated, enter the show running-configcommand and look for the cable interface configuration information. If upstream power adjustment is enabled, any or all three of the continue, noise, and threshold power adjustment entries will be displayed in the show running-configoutput. If all three continue, noise, and threshold upstream power adjustments have been disabled, no power adjustment entry will be displayed in the show running-configoutput.

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 Timing Adjustment

To enable upstream timing 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 time-adjust	Sets the minimum timing adjustment that will allow
	continue seconds	continued ranging status. Valid values are 2 to
		64 seconds. Default = 2 seconds.
Step 2
	CMTS01(config-if)#cable upstream usport time-adjust	Sets the timing adjustment threshold value in
	threshold seconds	seconds. Valid values are 1 to 32 seconds.
		Default = 1 second.
Step 3
	CMTS01(config-if)# end m CMTS01#	Returns to enable (privileged EXEC) mode.

Cisco IOS Multiservice Applications Configuration Guide

MC-557