Cisco Systems UBR10012 Activating Upstream Differential Encoding

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Cisco uBR10012 Universal Broadband Router Software Configuration Guide

OL-1520-05

Chapter3 Configuring Cable Interface Features for the CiscouBR10012Router Configuring the Upstream Cable Interface

To determine if upstream admission control is configured and activated, enter the showrunning-config

command in privileged EXEC mode and look for the cable interface configuration information. If

upstream admission control is configured and enabled, an admission control entry appears in the

showrunning-config command output, indicating the user-defined percentage of upstream channel

capacity allowable. If upstream admission control is disabled, no admission control entry appears in the

output.

Perform these steps if you are having difficulty with verification:

Step1 Ensure that the cable connections are not loose or disconnected.

Step2 Ensure that the cable interface line card is firmly seated in its chassis slot.

Step3 Ensure that the captive installation screws are tight.

Step4 Verify that you have entered the correct slot and port numbers.

Step5 Verify that you selected a valid frequency for your router.

Activating Upstream Differential Encoding

Differential encoding on the upstream is a digital encoding technique whereby a binary value is denoted

by a signal change rather than a particular signal level. To enable differential encoding on upstream

traffic to a specified cable interface, use the following command in cable interface configuration mode.

Upstream differential encoding is enabled by default.

Router(config-if)# cable upstream usport differential-encoding

To determine if upstream differential encoding is activated, enter the show running-config command

and look for the cable interface configuration information. If upstream differential encoding is enabled,