Specifications
3-28
Cisco Cable Modem Termination System Feature Guide
0L-1467-02
Chapter 3 Spectrum Management for the Cisco Cable Modem Termination System
Configuration Tasks
Creating Spectrum Groups
To create a spectrum group with either a specific frequency or a band of frequencies, use one of the
following commands in global configuration mode:
Refer to the “Adding an Upstream Frequency” section on page 3-29 and “Adding a Spectrum Band”
section on page 3-30 for additional syntax information for the cable spectrum-group command.
Tip To troubleshoot the configuration, make sure that you have entered a valid spectrum group number and type.
Configuring Spectrum Group Characteristics
After you have created spectrum groups for your cable network, you can configure the spectrum groups
with the following characteristics:
• Adding an Upstream Frequency, page 3-29
• Adding a Spectrum Band, page 3-30
• Setting Frequency Hop Threshold or Minimum Hop Period, page 3-30
• Adding a Shared Spectrum Group, page 3-31
Spectrum group characteristics provide more control over frequency usage and frequency hopping.
Configuring spectrum group characteristics enables frequency agility and disables the fixed upstream
frequency setting.
The cable spectrum-group command is used to configure spectrum group characteristics as well as to
create a spectrum group. The complete command is:
[no] cable spectrum-group
group-number
[time
day hh:mm:ss
][delete][{frequency
up-freq-hz
[
power-level-dbmv
]|hop threshold
percent
|hop period
seconds
|band
up-freq-hz up-freq2-hz
[
power-level-dBmV
]|shared}]
Command Purpose
CMTS01(config)# cable spectrum-group
group-number
[time
day hh:mm:ss
[delete]] frequency
up-freq-Hz
[
power-level-dBmV
]
or
CMTS01(config)# cable spectrum-group
group-number
[time
day hh:mm:ss
[delete]] band
up-freq-Hz up-freq2-hz
[
power-level-dBmV
]
Creates a spectrum group with a specific frequency.
Creates a spectrum group with a band of frequencies.
Group-number specifies the spectrum group you are
adding or specifies the spectrum group you want
removed from your router configuration. Valid range is
from 1 to 32.
An upstream frequency has an associated upstream
input power level in dBmV. The power level value
should be changed only if you want to change the
power level as part of spectrum management. The
standard power level is 0 dBmV.
The delete option deletes a frequency.
To remove a spectrum group, use the no cable
spectrum-group command.