Configuring Headend Broadband Access Router Features
Configuring the Downstream Cable Interface
Troubleshooting Tips
To troubleshoot the configuration, perform the following tasks:
•Make sure the cable connections are not loose or disconnected.
•Make sure the Cisco cable modem card is firmly seated in its chassis slot and the captive installation screws are tight.
•Make sure you entered the correct slot and port numbers when you typed the command.
•Make sure you have selected the default if you are not certain about the modulation rate needed.
•Make sure the downstream carrier is active by entering the cable downstream
Setting the Downstream Interleave Depth
Set the interleave depth for the downstream port on the Cisco cable modem card. A higher interleave depth provides more protection from bursts of noise on the HFC network; however, it will increase downstream latency. The valid values are 8, 16, 32 (default), 64, and 128.
To set the downstream interleave depth, use the following command in cable interface configuration mode:
Command | Purpose |
|
|
Sets the downstream interleave depth in | |
{8163264128} | milliseconds. |
|
|
Verifying the Downstream Interleave Depth
To verify the downstream interleave depth setting, enter the show controllers cable command for the downstream port you have just configured:
router# show controllers cable 6/0 downstream
Cable6/0 Downstream is up
Frequency=96000000, Channel Width 6 MHz,
FEC
Troubleshooting Tips
To troubleshoot the configuration, perform the following tasks:
•Make sure the cable connections are not loose or disconnected.
•Make sure the Cisco cable modem card is firmly seated in its chassis slot and the captive installation screws are tight.
•Make sure you entered the correct slot and port numbers when you typed the command.
•Make sure the downstream carrier is active by entering the cable downstream
Cisco IOS Multiservice Applications Configuration Guide
