Configuring Headend Broadband Access Router Features
Configuring the Upstream Cable Interface
Verifying Upstream FEC
To verify if FEC is activated or deactivated, enter the more
router# more
Building configuration...
!
interface Cable6/0
ip address 1.1.1.1 255.255.255.0 no keepalive
cable
cable downstream | annex B |
cable downstream | modulation 64qam |
cable downstream | |
cable downstream | |
cable upstream 0 | frequency 15008000 |
cable upstream 0 | fec |
cable upstream 0 | scrambler |
no cable upstream 0 shutdown
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 entered the correct upstream port number:
–On the MC16C cable modem card, this can be u0 to u5.
–On the MC14C cable modem card, this can be u0 to u3.
–On the MC12C cable modem card, this can be u0 or u1.
–On the MC11C cable modem card, this can be u0 only.
Specifying Upstream Minislot Size
To specify the minislot size (in ticks) for specific upstream cable interfaces, use the following command in cable interface configuration mode:
Command | Purpose |
|
|
Specifies the minislot size in ticks for the selected | |
size | upstream interface. Acceptable values are 2, 4, 8, 16, 32, |
| 64, and 128. |
| Default = 8. |
|
|
Cisco IOS Multiservice Applications Configuration Guide
