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Cisco Broadband Cable Command Reference Guide
OL-1581-07
Chapter 6 Cable CPE Commands
interface cable-modem
cable-modem upstream
preamble qpsk
Enables the QPSK modulation scheme in the upstream direction
from the cable interface to the CMTS.
cable-modem voip best-effort
Allows voice traffic to be transmitted on the upstream using a
best-effort QoS.