Configuring Headend Broadband Access Router Features
Configuring the Upstream Cable Interface
MC-557
Cisco IOS Multiservice Applications Configuration Guide
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-config command 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-config output. If all three continue, noise, and threshold
upstream power adjustments have been disabled, no power 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 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
continue seconds
Sets the minimum timing adjustment that will allow
continued ranging status. Valid values are 2 to
64 seconds. Default = 2 seconds.
Step 2
CMTS01(config-if)# cable upstream usport time-adjust
threshold seconds
Sets the timing adjustment threshold value in
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.
