Cisco uBR924 Configuration Manual page 34

Cable access router

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cable-modem upstream preamble qpsk

To enable the QPSK modulation scheme in the upstream direction from the cable access router

interface to the headend, enter the cable-modem upstream preamble qpsk command from

interface conﬁguration mode. Use the no form of this command to disable upstream modulation for

the interface.

cable-modem upstream preamble qpsk

no cable-modem upstream preamble qpsk

Syntax Description

This command has no arguments or keywords.

Defaults

Enabled

Command Modes

Interface conﬁguration

Command History

Release

11.3 NA

Usage Guidelines

Examples

The following example shows how to enter the cable-modem upstream preamble qpsk command

for a cable access router interface, starting from global conﬁguration mode:

uBR924(config)# interface cable-modem 0

uBR924(config-if)# cable-modem upstream preamble qpsk

uBR924(config-if)#

Cisco IOS Release 12.0(5)T

Modiﬁcation

This command was ﬁrst introduced.

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