Cisco Systems uBR7246 Manual De Usuario

Voice, Video, and Home Applications Configuration Guide

The cable interface will not operate until you either create and configure a spectrum group or 

set a fixed upstream frequency. From the interface configuration prompt, an interface is assigned 
membership in a spectrum group. From the interface point of view, the spectrum group also 
represents the set of upstreams connected to the same group of fiber nodes. This allows the spectrum 
manager to know if upstream frequencies need to be managed together.

The configuration and activation of frequency agility depends on each cable operator’s physical 
plant.

To configure and activate frequency agility, perform the following tasks:

•

•

Create Spectrum Groups

To create spectrum groups, use the following commands in global configuration mode:

Validation Tips

To verify that a spectrum group has been created, enter the show cable spectrum-group command:

router# show cable spectrum-group

spectrum-group 1

spectrum-group 2

spectrum-group 3

Troubleshooting Tips

If you are having trouble, make sure you have entered a valid spectrum group number and type.

cable spectrum-group group-number type blind

Create a blind spectrum group.

cable spectrum-group group-number type scheduled 
daily

Create a scheduled spectrum group that 
can change its frequency and power 
level at the same time every day. 

cable spectrum-group group-number type scheduled 
periodic-sec seconds

Create a scheduled spectrum group that 
can change its frequency and power 
level at a specified interval in seconds.