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
To create spectrum groups, specify a list of upstream frequencies and nominal power levels that each
spectrum group can use when an upstream frequency change is necessary. Each spectrum group should
have its own list of upstream frequencies.
After you have created one or more spectrum groups, you can add characteristics to them, providing
more definitive control over frequency usage and frequency hopping. See the “Configuring and
Activating Spectrum Groups” section on page 3-29.
Verifying Spectrum Groups
To verify that a spectrum group is created, enter the show cable spectrum-group command:
CMTS01# show cable spectrum-group
spectrum-group 1
spectrum-group 2
spectrum-group 3
Tip If you are having difficulty with verification, make sure you have entered a valid spectrum group number
and type.
Configuring and Activating Spectrum Groups
After you create a spectrum group, configure a list of upstream frequencies and optional nominal power
levels that each spectrum group can use when an upstream frequency change is necessary. Each spectrum
group should have its own list of upstream frequencies.
Note Valid frequencies are 5,000,000 to 42,000,000 Hz for NTSC operations and 5,000,000 to 65,000,000 for
EuroDOCSIS 8 MHz operations.
To configure and activate a spectrum group, use the following commands in global configuration mode.
Note Configuring a spectrum group enables frequency agility and disables the fixed upstream frequency
setting.
Command Purpose
CMTS01(config)# cable spectrum-group
group-number [time day hh:mm:ss] [delete]
frequency ctr-freq-hz [power-level-dbmv]
CMTS01(config)# cable spectrum-group
group-number [time day hh:mm:ss] [delete] band
start-freq-hz end-freq-hz [power-level-dbmv]
Add the upstream frequency to the list of valid
frequencies with a default power level for a
spectrum group.
Note If the time parameter is configured,
the frequency setting or band is either
made available or deleted at the
specified time.
The power level value should only be changed
if you want to change the power level as part
of spectrum management. The standard power
level is 0 dBmV.