Cisco Systems uBR7200 manual Command, Purpose, MC-569

Configuring Headend Broadband Access Router Features

Configuring and Activating Frequency Agility

To configure and activate a spectrum group, use one of the following commands in global configuration mode:

Command	Purpose
CMTS01(config)# cable spectrum-group group-number[time	Adds the upstream frequency to the list of valid
day hh:mm:ss] [delete] frequency ctr-freq-hz	frequencies with a default power level for a spectrum
[power-level-dbmv]	group.
or
CMTS01(config)# cable spectrum-group group-number[time	Note	If the time parameter is configured, the
		frequency setting or band is either made
day hh:mm:ss] [delete] band start-freq-hz end-freq-hz
		available or deleted at the specified time.
[power-level-dBmV]
	The power level value should only be changed if you
	want to change the power level as part of spectrum
	management. The standard power level is 0 dBmV.

Note Configuring a spectrum group enables frequency agility and disables the fixed upstream frequency setting.

You must repeat the command described above for each frequency or power level that you want to add to a spectrum group’s list of valid values.

If your cable plant has an upstream noise characteristic on a weekly cycle, use time-scheduled spectrum allocation. An example follows:

CMTS01(config)# cable spectrum-group 1 time Mon 08:00:00 frequency 21600000

Deletion is performed using the delete keyword:

CMTS01(config)# cable spectrum-group 1 time Mon 18:00:00 delete frequency 21600000

The following is an example of a spectrum group configuration that is designed to perform minor equalization as a function of frequency.

CMTS01(config)# cable spectrum-group 1 frequency 21600000

CMTS01(config)# cable spectrum-group 1 frequency 24800000 1

CMTS01(config)# cable spectrum-group 1 frequency 28000000 2

In this example, the upstream port nominal receive power at 21.6 MHz is 0 dBmV, at 24.8 MHz is

1 dBmV, and at 28.0 MHz is 2 dBmV. At any time, the power level set in the interface configuration overrides the spectrum group power level.

Cisco IOS Multiservice Applications Configuration Guide

MC-569