Specifications

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Cisco Cable Modem Termination System Feature Guide
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Chapter 3 Spectrum Management for the Cisco Cable Modem Termination System
Configuration Examples
• Use the following example to configure a continuous band between 5,000,004 and 40,000,000 Hz
for scheduled spectrum group 4 with a default power level of 0 dBmV. The band is available to the
spectrum group starting at 12:00 p.m. local time each Monday:
Router(config)# cable spectrum-group 4 time Monday 12:00:00 band 5000004 40000000
• Use the following example to add the upstream frequency 9,500,000 Hz to the list of valid
frequencies and change the nominal power level to 5 dBmV. The spectrum manager adjusts
frequencies and power levels on this group at 2:00 a.m. local time each day:
Router(config)# cable spectrum-group 3 time 02:00:00 frequency 9500000 5
• Use the following example to configure the minimum period before which a frequency hop can
occur in seconds:
Router(config)# cable spectrum-group 3 hop period 800
• Use the following example to configure the threshold value (expressed as a percentage) of the
number of “offline” modems identified before the router initiates an automatic frequency hop:
Router(config)# cable spectrum-group 3 hop threshold 40
• Use the following example to configure a particular spectrum group as a shared RF spectrum group.
Specifying a given spectrum group as “shared” tells the router that you want to be sure that upstream
frequencies assigned to upstream ports are not assigned to additional upstream ports:
Router(config)# cable spectrum-group 3 shared
• Use the following example to remove a specified spectrum group from your configuration:
Router(config)# no cable spectrum-group 3
• 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 receives power at 21.6 MHz with a default power level of 0 dBmV,
at 24.8 MHz with a power level of 1 dBmV, and at 28.0 MHz with a power level of 2 dBmV. At any
time, the power level set in the interface configuration overrides the spectrum group power level.
Dynamic Upstream Modulation Examples
The following examples describe how to display modulation profile information with the show cable
modulation-profile command and to define a modulation profile with the cable modulation-profile
command.
Verifying Your Settings
Step 1 To check the value of the settings you have entered, enter the show running-config command in
privileged EXEC mode at the Router# prompt:
Router# show running-config
To review changes you make to the configuration, use the show startup-config command in privileged
EXEC mode to display the information stored in NVRAM.