Cisco 7246 - uBR Router Manual de usuario descargar pdf (Pagina 4)

Configuration Tasks

12.0(3)T

Conﬁguring Spectrum Groups

You can conﬁgure upstream frequency hop tables using cable spectrum-group commands. Start by

determining which upstream ports are assigned to a combiner group. Then apply the following steps

to conﬁgure a spectrum group:

Conﬁguring Frequency Hopping

To conﬁgure frequency hopping, apply the following steps:

After you have established basic operation, inject a tone to the upstream port. For example, if the

upstream frequency is currently 22.4 MHz, inject a 22.4 MHz tone at approximately the same power

level as the modem. (If the power level at the modem is 40 dBmV, set the tone power to 40 dBmV.)

The interfering carrier should shut down the channel and cause the frequency to change to the next

conﬁgured value. In this example, it would be 24.0 MHz.

If you do not have an RF tone generator, use another line card and modem that caries trafﬁc. Connect

the upstream to the same combiner group, and use the data carrier as an interfering signal by setting

it to the same frequency. For example, to test frequency hopping on c3/0, install c4/0 and connect

both upstreams together using a combiner. If the upstream frequency of c3/0 is currently 22.4 Mhz,

set c4/0 to 22.4 Mhz while c4/0 is carrying trafﬁc. This should force c3/0 to change the frequency to

the next conﬁgured value.

Step Command Purpose

1 router(config)# cable spectrum-group

frequency

Create the frequency hop table

under Cisco IOS global

conﬁguration mode.

2 router(config-if)# cable

spectrum-group

Assign the upstream port to the

frequency hop table under

Cisco IOS interface

conﬁguration mode.

Step Command Purpose

1 router(config)# cable spectrum-group 1 frequency 20800000

router(config)# cable spectrum-group 1 frequency 22400000

router(config)# cable spectrum-group 1 frequency 24000000

Conﬁgure spectrum groups.

2 router(config)# interface c3/0

Assign the upstream ports to the

frequency hop tables for

interface.

3 router(config-if)# cable spectrum-group 1

router(config-if)# no cable upstream 0 shutdown

Assign members to spectrum

groups

, making sure that

everything else has been

conﬁgured correctly on the

interface.

4 router(config-if)# cable upstream 2 spectrum-group 1

router(config-if)# no cable upstream 2 shutdown

If you have an MC16 card,

upstreams can be assigned

individually.

5 router(config-if)# exit

router# test cable hop c3/0

Exit conﬁguration mode and

force the system to hop.

1 2 3 4 5 6 7 8 9 ... 77 78

Comentarios a estos manuales

Sin comentarios

Cisco 7246 - uBR Router Manual de usuario Pagina 4

Comentarios a estos manuales

Relacionado con productos y manuales para Redes Cisco 7246 - uBR Router