Installation guide

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Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
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Chapter 3 Configuring the Cisco Cable Interface
Configuring and Activating Frequency Agility
Tip If you are having difficulty with verification, make sure you entered a valid value for gracetime or
lifetime for KEK and TEK privacy.
Note If you entered the cable privacy mandatory command, then cable interfaces do not operate unless the
cable interface configuration file specifies that privacy is on.
Configuring and Activating Frequency Agility
Set upstream port frequency to a fixed value during system installation and testing. Choose this value
from your frequency allocation plan for the RF plant segment connected to the upstream.
When the system has reached sufficient stability, the RF domain topology can be entered into the
configuration file to enable spectrum management. Spectrum management or frequency agility is
configured and activated using spectrum groups.
Frequency-hopping policies supported on all Cisco cable modem cards include combined blind and
scheduled specifications, as well as guided frequency hops.
Note 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.
To configure and activate frequency agility, perform the following tasks:
• “Creating Spectrum Groups” section on page 3-28
• “Configuring and Activating Spectrum Groups” section on page 3-29
• “Configuring Spectrum Group Characteristics” section on page 3-32
Creating Spectrum Groups
To create a spectrum group, use one of the following general commands in global configuration mode.
Frequency agility is configured and activated using spectrum groups. You can create from 1 to 32
spectrum groups for each cable interface card upstream port.
Command Purpose
CMTS01(config)# 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.
CMTS01(config)# 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.