Installation guide

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Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
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Chapter 3 Configuring the Cisco Cable Interface
Configuring and Activating Frequency Agility
Table 3-1 describes the spectrum-group parameters.
Examples are provided to configure differing spectrum groups:
• Use the following example to configure spectrum group 1 with an upstream frequency of
6,500,000 Hz and a default power level of 0 dBmV:
Router(config)# cable spectrum-group 1 frequency 6500000
• Use the following example to add the upstream frequency 7,000,000 Hz to the list of valid
frequencies with a default power level of 0 dBmV for spectrum group 1:
Router(config)# cable spectrum-group 1 frequency 7000000
• Use the following example to configure spectrum group 2 with an upstream frequency 7,500,000 Hz
and change the power level to 5 dBmV:
Router(config)# cable spectrum-group 2 frequency 7500000 5
• Use the following example to configure spectrum group 3 with an upstream band of 12,000,000 to
18,000,000 Hz and default power level of 0 dBmV:
Router(config)# cable spectrum-group 3 band 12000000 18000000
Command Purpose
CMTS01(config)# cable spectrum-group
groupnum
shared
Specifying a given spectrum group as “shared” tells the
Cisco uBR7100 series CMTS that you want to be sure that
upstream frequencies assigned to upstream interfaces are
not assigned to additional upstream interfaces.
Table 3-1 spectrum-group parameters
Syntax Valid Values
group number
Specifies the spectrum group for which you are specifying a parameter value or specifies the number of the
spectrum group you wish to remove from your router configuration. Valid range is from 1 to 32.
parameter
The spectrum group values that can be changed or added are:
• Frequency—Specifies the center frequency for the given spectrum group. 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.
• Band—Specifies a range of center frequencies the Cisco uBR7100 series router can scan in order to find
an acceptable channel to which the spectrum group can hop.
• Time—Specifies a time of day that the Cisco uBR7100 series router should automatically perform a
frequency hop for the given upstream spectrum group.
Note The time command can be combined with the frequency and band commands.
• Hop period—Specifies the minimum period (in seconds) before which a frequency hop can occur.
• Hop threshold—The threshold value (expressed as a percentage) of the number of “offline” modems
identified before the Cisco uBR7100 series router initiates an automatic frequency hop.
• Shared—Specifies that a particular spectrum group is a shared RF spectrum group; upstream
frequencies assigned to upstream interfaces are not to be assigned to additional upstream interfaces.
value
The corresponding parameter value for the parameter you are defining for a given spectrum group.