Cisco Systems uBR7200 manual MC-570

Configuring Headend Broadband Access Router Features

Configuring and Activating Frequency Agility

The following example enables spectrum management for all upstream ports, assuming that all combiner groups use the frequency band from 20 to 26 MHz:

CMTS01(config)# cable spectrum-group 1 band 20000000 26000000

CMTS01(config)# cable spectrum-group 2 shared

CMTS01(config)# cable spectrum-group 2 band 20000000 26000000

CMTS01(config)# cable spectrum-group 3 shared

CMTS01(config)# cable spectrum-group 3 band 20000000 26000000

CMTS01(config)# interface Cable3/0

CMTS01(config-if)#cable spectrum-group 1

CMTS01(config-if)#cable upstream 2 spectrum-group 2

CMTS01(config-if)#cable upstream 3 spectrum-group 2

CMTS01(config-if)#cable upstream 5 spectrum-group 3

CMTS01(config-if)# exit

CMTS01(config)# interface Cable4/0

CMTS01(config-if)#cable spectrum-group 1

CMTS01(config-if)#cable upstream 0 spectrum-group 3

A description of the spectrum groups 1 through 3 follows:

•Spectrum group 1—This group is nonshared. Upstream RF domains exist for each member upstream port.

Upstream Port	RF Domain
Cable3/0 U0	combiner group A
Cable3/0 U1	combiner group B
Cable3/0 U4	combiner group D
Cable4/0 U1	combiner group F
Cable4/0 U2	combiner group G
Cable4/0 U3	combiner group H
Cable4/0 U4	combiner group I
Cable4/0 U5	combiner group J

•Spectrum group 2—This group is shared. A single upstream RF domain exists.

Upstream Port		RF Domain
Cable3/0	U2	combiner	group C
Cable3/0	U3	combiner	group C

•Spectrum group 3—This group is shared. A single upstream RF domain exists.

Upstream Port		RF Domain
Cable3/0	U5	combiner	group E
Cable4/0	U0	combiner	group E

For the 20 to 26 MHz band of each RF domain, the spectrum is channelized according to the

channel width settings of each member port. For example, if the ports U2 and U3 of Cable3/0 are set to

3.2MHz and 1.6 MHz channel widths, respectively, then spectrum group 2 uses the following channelization:

>Channel Width Start Stop Center

>(Mhz) (Mhz) (Mhz) (Mhz)

> 1		3.2	20.0	23.2	21.6
> 2*		1.6	20.0	21.6	20.8
>	3*	1.6	21.6	23.2	22.4
>	4	1.6	23.2	24.8	24.0

Note Channels 2 and 3 are not available when channel 1 is in use.

Because the group is shared, ports U2 and U3 will be assigned channels 1 and 4, respectively, to prevent overlap.

Cisco IOS Multiservice Applications Configuration Guide

MC-570