Specifications

Command Reference
24
Cisco IOS Release 12.0(3)T
cable-modem upstream preamble qpsk
To enable the QPSK modulation scheme in the upstream direction from the cable modem 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.
Default
Enabled
Command Mode
Interface configuration
Usage Guidelines
This command first appeared in Cisco IOS Release 11.3 NA.
Example
The following example shows how to enter the cable-modem upstream preamble qpsk command
for a cable modem interface, starting from global configuration mode:
uBR904(config)# interface cable-modem 0
uBR904(config-if)# cable-modem upstream preamble qpsk
uBR904(config-if)#
Related Commands
cable-modem compliant bridge
cable-modem downstream saved channel
cable-modem fast-search
interface cable-modem