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Configure the Upstream Cable Interface
VC-148
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:
Step Command Purpose
1 interface cable port/slot Specify a cable interface, and enter the cable
interface configuration mode.
2 no cable upstream 0 shutdown Enable upstream data traffic.