Installation guide

3-2
Cisco uBR7100 Series Universal Broadband Router Software Configuration Guide
OL-2238-03
Chapter 3 Configuring the Cisco Cable Interface
Configuring the Downstream Cable Interface
• “Setting the Downstream Modulation” section on page 3-6
• “Setting the Downstream Interleave Depth” section on page 3-6
• “Setting the Downstream Helper Address” section on page 3-7
• “Setting Downstream Rate Limiting” section on page 3-8
Note In most applications, default values for the commands used in these configuration steps are adequate to
configure the Cisco uBR7100 series router. You do not need to specify individual parameters unless you
want to deviate from system defaults.
For information on other configuration options, see the “Cisco Cable Modem Termination System
Commands” chapter in the Broadband Command Consolidation Guide, available on Cisco.com and the
Documentation CD-ROM.
Activating the Downstream Carrier
To activate a downstream port on a Cisco uBR7100 series cable interface card for digital data
transmissions over the HFC network, complete the steps in the following table.
Command Purpose
Step 1
CMTS01> enable
Password:
password
CMTS01#
Enter enable (privileged EXEC) mode.
Enter the password.
You have entered privileged EXEC mode when the
prompt displays the pound symbol
(#).
Step 2
CMTS01# configure terminal
Enter configuration commands, one per line. End with
CNTL/Z.
CMTS01(config)#
Enter global configuration mode. You have entered
global configuration mode when the prompt displays
(config)#.
This command can be abbreviated to config t.
Step 3
CMTS01(config)# interface cable1/0
CMTS01(config-if)#
Enter cable interface configuration mode.
In this example, the interface is downstream port 0 on
the cable interface card installed in slot 1 of the
Cisco uBR7100 series CMTS.
Step 4
CMTS01(config-if)# cable downstream if-output
CMTS01(config-if)# no cable downstream if-output
Default. Activate downstream digital data from the
Cisco uBR7100 series router.
Deactivate downstream digital data. This command
mutes the IF output of the cable interface card and
shuts down the interfaces.
Step 5
CMTS01(config-if)# no shutdown Place the downstream port in the “admin up” state.
Step 6
CMTS01(config-if)# end
CMTS01#
%SYS-5-CONFIG_I: Configured from console by console
Return to privileged EXEC mode.
This message is normal and does not indicate an error.