user manual

Configuring Headend Broadband Access Router Features
Managing Cable Modems on the HFC Network
MC-586
Cisco IOS Multiservice Applications Configuration Guide
Configuring Sync Message Interval
To specify the interval between successive sync message transmissions from the Cisco uBR7200 series,
use the following command in cable interface configuration mode:
To return the sync message interval to its default value of 10 ms, enter the no cable sync-interval
command in cable interface configuration mode.
Verifying Sync Message Interval
To verify whether a sync message interval has been configured, enter the show running-config
command and look for the cable interface configuration information. If a sync message interval has been
configured, it will appear in this output. If the sync message interval has been deactivated or reset to its
default value, no sync interval command line will appear in the output.
Troubleshooting Tips
To troubleshoot the configuration, make sure you entered the correct slot and port numbers when you
entered cable interface configuration mode.
Configuring Telco Return
The Cisco uBR7200 series routers support both two-way communication and DOCSIS-based telco
return communication from remote cable modems.
Note DOCSIS telco return is only supported in Cisco IOS software containing “t” in the
filename. If you do not have a software image that supports telco return, you will need to
download the software from CCO.
For detailed instructions on configuring telco return, refer to the document Telephone Return for the
Cisco uBR7200 Series Cable Router on CCO. You will find this document on the index page for
Cisco IOS software under the section “New Features for Cisco IOS Release 12.0(5)T.”
Activating Cable Modem Authentication
The Cisco uBR7200 series can be configured to require all cable modems to return a known text string
in order to register with the CMTS and gain access to the network. The text string can be from 1 to
80 characters in length.
To activate cable modem authentication, use the following command in cable interface configuration
mode:
Command Purpose
CMTS01(config-if)# cable sync-interval msec
Specifies the interval in milliseconds (ms) between
successive sync message transmissions from the
Cisco uBR7200 series. Valid values are from 1 to 200 ms.
Default = 10 ms.