Cisco DNCS System Release 2.7 3.7 4.2 Installation Guide
78-4003052-01 Rev G
Quadrature Phase-Shift Keying. Digital modulation scheme that send data by modulating the
phase of a reference signal (the carrier wave).
The QPSK modulator works with the QPSK demodulator and the DHCT to provide forward
signaling and a reverse communications path for interactive video and data services. The
QPSK modulator and demodulator convert digital bit streams to RF format and RF signals to
digital bits, respectively.
radio frequency. The range of electromagnetic frequencies above the audio range and below
infrared light. Most wireless transmission uses RF, including radio, TV, satellites, portable
phones, cellular phones, and wireless networks.
Return Material Authorization DHCT. A DHCT that the service provider has received back
from factory repair.
Service Application Manager. Associates a specific service with an application that defines the
medium to be used for that service, such as the World Wide Web. The SAM maintains the
application in a specific directory to be used when needed by the DHCTs.
Cisco Resident Application. The set of operating programs that is “permanently” loaded into
the DHCT. These programs are immediately available to the subscriber upon activation of the
Service Disconnect feature
The process of disabling a DHCT so that it cannot be used to view cable services. Also known
as Brick mode.
system information. A standard set of tables providing the data necessary for a navigation
device to discover and access services.