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 Tasks
You can use the command to configure all the characteristics at once or enter the parts of the command
separately to configure a separate characteristic. Use the no form of the command to remove a spectrum
group.
Note For more information on the cable spectrum-group command and for syntax descriptions, see the Cisco
Broadband Cable Command Reference Guide on Cisco.com and on the Documentation CD-ROM.
Adding an Upstream Frequency
Before you add a list of upstream frequencies (or frequency hop tables), start by determining which
upstream ports are assigned to a combiner group. Refer to the “Determining the Upstream Ports
Assigned to a Combiner Group Example” section on page 3-61 for an example.
To add a list of upstream frequencies and optional nominal power levels that each spectrum group can
use when an upstream frequency change is necessary, use one of the following commands in global
configuration mode:
Note Each spectrum group should have its own list of upstream frequencies. Valid frequencies are 5,000,000
to 42,000,000 Hz; valid power levels at a channel width of 1.6 MHz are –10 dBmV to 25 dBmV.
Command Options (either/or) Purpose
CMTS01(config)# cable spectrum-group group-number
[delete] frequency up-freq-hz [ power-level-dbmv ]
Adds an upstream frequency to the list of valid frequencies with a
default power level for a spectrum group. Specifies the center
frequency for the given spectrum group for a frequency hop.
Entering additional cable spectrum-group group-number
frequency commands for the same spectrum group creates a
collection of allowable center frequencies for spectrum group
hopping.
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.
CMTS01(config)# cable spectrum-group group-number
[time day hh:mm:ss ][delete] frequency up-freq-hz
[ power-level-dbmv ]
Adds an upstream frequency to the spectrum group at a particular
time of day and day of the week. The time option specifies a time of
day and day of the week on which the CMTS should automatically
perform a frequency hop for the given spectrum group.
The delete option deletes a frequency at a particular time and day.
Note If the time option is configured, the frequency setting is
either made available or deleted at the specified time.