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Configure and Activate Spectrum Groups
Configuring Cisco uBR7246 Universal Broadband Router Features VC-153
Configure and Activate Spectrum Groups
After you create a spectrum group, you need to configure a list of upstream frequencies and nominal
power levels that each spectrum group can use when an upstream frequency change is necessary.
Each spectrum group should have its own list of upstream frequencies. Valid frequencies are
5,000,000 to 42,000,000 Hz, and valid power levels are –10 dBmV to 10 dBmV. The power level
value should only be changed if you want to change only the power level as part of spectrum
management. The standard power level is 0 dBmV.
Note You must repeat this command for each frequency or power level that you want to add to a
spectrum group’s list of valid values.
To configure and activate a spectrum group, use the following command in global configuration
mode:
Validation Tips
To verify if spectrum groups have been configured and activated, enter the show cable
spectrum-group command:
router# show cable spectrum-group
spectrum-group 1
6 .500 MHz 0 dBmV input level
7 .000 MHz 0 dBmV input level
spectrum-group 2
7 .500 MHz -5 dBmV input level
spectrum-group 3
9 .000 MHz -0 dBmV input level
9 .500 MHz -5 dBmV input level
Troubleshooting Tips
If you are having trouble, make sure you entered a valid spectrum group number, time, frequency,
and input power level.
Activate IP Address Resolution Protocol
Address Resolution Protocol (ARP) is an Internet protocol used to map IP addresses to MAC
addresses on computers and other equipment installed in a network. You need to activate ARP
requests so the Cisco uBR7246 can perform IP address resolution on the downstream path.
Note The default values for the commands used in this configuration step are, in most cases,
adequate to configure the Cisco uBR7246.
Command Purpose
cable spectrum-group group-number [time hh:mm:ss]
frequency number [power-level-dbmv]
Add the upstream frequency to the list of
valid frequencies with a default power
level for a spectrum group.