Cisco Systems uBR7200 Activating the Upstream Ports, Verifying Upstream Timing Adjustment, MC-558

Configuring Headend Broadband Access Router Features

Configuring the Upstream Cable Interface

To return the upstream time adjustment ranging value to the default of 2 seconds, enter the following command in cable interface configuration mode:

CMTS01(config-if)# no cable upstream usport time-adjust continue

To return the upstream time adjustment threshold value to the default of 1 second, enter the following command in cable interface configuration mode:

CMTS01(config-if)# no cable upstream usport time-adjust threshold

Verifying Upstream Timing Adjustment

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

show running-config 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 the Upstream Ports

Each upstream port must be activated to enable upstream data transmission from the cable modems on the HFC network to the Cisco uBR7200 series router.

Note The upstream cable interface will not operate until you either set a fixed upstream frequency or create and configure a spectrum group. See the “Setting the Upstream Frequency” or the “Configuring and Activating Frequency Agility” sections in this chapter for details.

Cisco IOS Multiservice Applications Configuration Guide

MC-558