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Cisco uBR7200 Series Universal Broadband Router Software Configuration Guide
OL-2239-03
Chapter5 Managing Cable Modems on the Hybrid Fiber-Coaxial Network
Activating Cable Modem Insertion Interval
no cable secret-shared
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
!
Troubleshooting CM Authentication
If you are having trouble, make sure that you entered the correct slot and port numbers when you entered
cable interface configuration mode. For additional troubleshooting information, refer to Chapter8,
“Troubleshooting the System.”
Activating Cable Modem Insertion Interval
When a CM is ready to transmit data, it requests a channel from the CiscouBR7200series. You can limit
the amount of time that a CM requests a channel for the first time from the
CiscouBR7200series. A CM's initial channel request is known as insertion. The valid range is 100 to
2000 milliseconds.
To activate the CM insertion interval, use the following command in cable interface configuration mode.
Validating Cable Modem Insertion Interval
To verify that a CM insertion interval has been set, enter the moresystem:running-config command,
and look for the cable interface configuration information, as shown in this sample command output:
Router# more system:running-config
Building configuration...
Current configuration:
!
interface Cable5/0
ip address 1.1.1.1 255.255.255.0
no keepalive
cable insertion-interval 2000
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
!
Troubleshooting Cable Modem Insertion Interval
If you are having trouble, make sure that you entered the correct slot and port numbers when you typed
the command.
Command Purpose
cable insertion-interval milliseconds
Sets the insertion interval in milliseconds.