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
To configure a spectrum group with multiple fixed frequencies, use the following procedure:
Command Purpose
Step 1
Router(config)# configure terminal
Enters configuration mode.
Step 2
Router(config)# cable spectrum-group
group-number [ day time hh:mm:ss ] frequency
up-freq-hz [ power-level-dbmv ]
Creates a spectrum group and specifies the frequency (or
frequencies) that belong to the group.
group-number = Spectrum group number. Valid range is 1 to 32.
Configuring a spectrum group with multiple entries of this type,
defines a list of frequencies that are available for use as
upstream frequencies.
day and time hh:mm:ss = (Optional) For scheduled spectrum
groups, specifies the day of the week (Sun–Sat) and the time of
day that the frequency and input power level should change.
frequency up-freq-hz = Specific upstream frequency. Valid
range is 5,000,000 to 42,000,000 Hz.
power-level-dbmv = (Optional) Nominal input power level.
Valid range is –10 to +10 decibels per millivolt (dBmV). Some
cable plants might want to change only the input power level
and not frequency on a daily time schedule.
Step 3
Router(config)# cable spectrum-group
group-number [time hh:mm:ss ] frequency
up-freq-hz [ power-level-dbmv ]
Repeat this command to assign multiple specific frequencies to
one spectrum group.
Note You must assign a minimum of two frequencies to a
spectrum group to enable frequency hopping. If only
one frequency is assigned to a spectrum group, no
hopping occurs, unless guided hopping has been
enabled with the cable upstream hopping blind
command.
Step 4
Router(config)# cable spectrum-group
group-number hop period seconds
Specifies the minimum time in seconds between frequency
hops for the spectrum group. The default value is 25 seconds.
Step 5
Router(config)# interface type slot/port
Configures the interface where:
type = cable
slot = slot number in chassis (slot numbers begin with a 0)
port = port number on cable modem slot (port numbers begin
with a 0)
Step 6
Router(config-if)# cable upstream n
spectrum-group y
or
Router(config-if)# cable spectrum-group y
Assigns the spectrum group y to the upstream port n on the
Cisco uBR-MC16S cable interface line card.
Assigns the spectrum group y to all upstream ports on the cable
interface card.
Step 7
Router(config-if)# exit
Exits configuration mode and forces the system to hop.