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 a range of frequencies, use the following procedure:
The Cisco uBR10012 router using Cisco IOS Release 12.2(8)BC2 does not support spectrum groups
with fixed frequencies.
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 ] band
up-freq-hz up-freq2-hz [ power-level-dbmv ]
Creates a spectrum group and specifies a range of 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.
band up-freq-hz up-freq2-hz = Sets the band of frequencies for
this spectrum group. The valid range for up-freq-hz and
up-freq2-hz is 5,000,000 to 42,000,000 Hz, but up-freq2-hz
must be greater than up-freq-hz.
power-level-dbmv = (Optional) Nominal input power level.
Valid range is –10 to +10 decibels per millivolt (dBmV), with a
default of 0 dBmV. Some cable plants might want to change
only the input power level and not frequency on a daily time
schedule.
Note When configuring a band of frequencies, specify a band that is 500 KHz larger than the largest desired
channel width, to ensure that the largest channel width can still be used when changing the center frequency
within the band.
Step 3
Router(config)# cable spectrum-group
group-number hop period 30
Specifies the minimum time in seconds between frequency
hops for the spectrum group. The default value is 300 seconds,
but it should be set to 30 for proper operation when using
Cisco IOS Release 12.2(8)BC2 on the Cisco uBR10012 router
and Cisco uBR-LCP2-MC16 cable interface line card.
Step 4
Router(config)# interface cable slot/port
Enters interface configuration mode for the cable interface where:
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 5
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.
or
Assigns the spectrum group y to all upstream ports on the cable
interface card.
Note Repeat the above commands as needed to configure
each upstream port.
Step 6
Router(config-if)# no cable upstream port
shutdown
Enables the upstream port. Repeat this command as needed to
configure each upstream port.
Step 7
Router(config-if)# exit
Exits configuration mode and force the system to hop.