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Activate the Downstream Carrier
Configuring Cisco uBR7246 Universal Broadband Router Features VC-143
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 the downstream carrier is active by entering the cable downstream if-output
command.
Activate the Downstream Carrier
To activate a downstream port on a cable modem card for digital data transmissions over the HFC
network, use the following commands in global configuration mode:
Validation Tips
To verify that the downstream carrier is active (up), enter the show controllers cable command for
the downstream port that you have just configured:
router# show controllers cable 6/0 downstream
Cable6/0 Downstream is up
Frequency=96000000, Channel Width 6 MHz, 64-QAM, Symbol Rate 5.056941 Msps
FEC ITU-T J.83 Annex B, R/S Interleave I=32, J=4
Troubleshooting Tips
If you are having trouble with this configuration:
• 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.
Step Command Purpose
1 interface cable port/slot Specify a cable interface and enter the cable interface
configuration mode.
2 cable downstream if-output Activate downstream digital data from the Cisco uBR7246.
(This is the default setting.)