Configuring Headend Broadband Access Router Features
Configuring and Activating Frequency Agility
MC-569
Cisco IOS Multiservice Applications Configuration Guide
To configure and activate a spectrum group, use one of the following commands in global configuration
mode:
Note Configuring a spectrum group enables frequency agility and disables the fixed upstream
frequency setting.
You must repeat the command described above for each frequency or power level that you
want to add to a spectrum group’s list of valid values.
If your cable plant has an upstream noise characteristic on a weekly cycle, use time-scheduled spectrum
allocation. An example follows:
CMTS01(config)# cable spectrum-group 1 time Mon 08:00:00 frequency 21600000
Deletion is performed using the delete keyword:
CMTS01(config)# cable spectrum-group 1 time Mon 18:00:00 delete frequency 21600000
The following is an example of a spectrum group configuration that is designed to perform minor
equalization as a function of frequency.
CMTS01(config)# cable spectrum-group 1 frequency 21600000
CMTS01(config)# cable spectrum-group 1 frequency 24800000 1
CMTS01(config)# cable spectrum-group 1 frequency 28000000 2
In this example, the upstream port nominal receive power at 21.6 MHz is 0 dBmV, at 24.8 MHz is
1 dBmV, and at 28.0 MHz is 2 dBmV. At any time, the power level set in the interface configuration
overrides the spectrum group power level.
Command Purpose
CMTS01(config)# cable spectrum-group group-number [time
day hh:mm:ss] [delete] frequency ctr-freq-hz
[power-level-dbmv]
or
CMTS01(config)# cable spectrum-group group-number [time
day hh:mm:ss] [delete] band start-freq-hz end-freq-hz
[power-level-dBmV]
Adds 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.
