Cisco Broadband Cable Command Reference Guide

cable upstream scrambler
cable upstream scrambler
Syntax Description
Defaults Disabled
2-242
Cisco Broadband Cable Command Reference Guide
Chapter 2 Cisco Cable Modem Termination System Commands
To enable the cable upstream scrambler, use the cable upstream scrambler command in cable interface
configuration mode. To restore the default configuration value for this command, use the no form of this
command.
cable upstream n scrambler
no cable upstream n scrambler
Command Modes Interface configuration (cable interface only)
Command History
Usage Guidelines This command causes CMs to enable their pseudo-random scrambler circuitry to improve the robustness
of the upstream receiver on the line card.
The scrambler on the upstream radio frequency (RF) carrier enables CMs on the HFC network to use
built-in scrambler circuitry for upstream data transmissions. The scrambler circuitry improves reliability
of the upstream receiver on the cable interface line card. The upstream scrambler is activated by default
and should not be disabled under normal circumstances.
Caution Scrambler must be activated for normal operation. Deactivate only for prototype CMs that do not support
scrambler.
Examples The following example shows how to activate the upstream scrambler:
Related Commands
n Specifies the upstream port number. Valid values start with 0 for the first
upstream port on the cable interface line card.
Release Modification
11.3 XA This command was introduced.
router(config-if)# cable upstream 0 scrambler#
Command Description
cable upstream fec Enables the upstream FEC.
cable upstream frequency Enters a fixed frequency of the upstream RF carrier for an
upstream port.
OL-1581-05