Cisco Systems uBR7246 Manual De Usuario

Voice, Video, and Home Applications Configuration Guide

Validation Tips

To verify if the upstream scrambler is activated, enter the command more system:running-config 
and look for the cable interface configuration information. The following is an excerpt from the 
more system:running-config command output.

router# more system:running-config

Building configuration...

 

Current configuration:

!

!

interface Cable6/0

 ip address 1.1.1.1 255.255.255.0

 no keepalive

 cable insertion-interval 150000

 cable downstream annex B

 cable downstream modulation 64qam

 cable downstream interleave-depth 32

 cable downstream symbol-rate 5056941

 cable upstream 0 frequency 15008000

 cable upstream 0 fec

 cable upstream 0 scrambler

 no cable upstream 0 shutdown

!

end

Troubleshooting Tips

If you are having trouble: 

•

Make sure the cable connections are not loose or disconnected. 

•

Make sure the cable modem card is firmly seated in its Cisco uBR7246 chassis slot.

•

Make sure that you have entered the correct slot and port numbers when you typed the command.

•

Make sure that you have entered the correct upstream port number. Currently this is always u0.

Activate the Upstream Ports

Activate the RF carrier on the upstream ports. Each upstream port must be activated to enable 
upstream data from the cable modems on the HFC network to the Cisco uBR7246.

To activate the upstream ports, use the following commands in global configuration mode:

interface cable port/slot

Specify a cable interface, and enter the cable 
interface configuration mode.

Enable upstream data traffic.