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Chapter 2
Cisco CMTS Configuration Commands
cable upstream fec
To enable upstream forward error correction (FEC), use the cable upstream fec command in cable
interface configuration mode. To disable FEC, use the no form of this command.
Syntax Description
n
Defaults
Enabled
Command Modes
Interface configuration (cable interface only)
Command History
Release
11.3 XA
Usage Guidelines
The Cisco CMTS uses FEC to attempt to correct any upstream data that might have been corrupted. To
use this feature, you need to activate FEC on the upstream RF carrier. When FEC is activated, the
Cisco CMTS commands all CMs on the network to activate FEC.
Examples
The following example shows how to activate upstream forward error correction:
router (config-if)# cable upstream 0 fec
Related Commands
Command
cable upstream frequency
cable upstream power-level
cable upstream scrambler
cable upstream shutdown
OL-1581-08
cable upstream n fec
no cable upstream n fec
Specifies the upstream port number. Valid values start with 0 for the first
upstream port on the cable interface line card.
Modification
This command was introduced.
Description
Enters a fixed frequency of the upstream RF carrier for an
upstream port.
Sets the input power level for the upstream RF carrier in
decibels per millivolt (dBmV).
Enables the cable upstream scrambler.
Disables the upstream port.
Cisco Broadband Cable Command Reference Guide
cable upstream fec
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