Cisco Headend Digital Broadband Delivery System
Glossary
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D
data carousel
See carousel.
data pump
See carousel.
DBDS
Digital Broadband Delivery System. The entire network architecture of our digital system that
ultimately provides signal to and from a subscriber’s DHCT. The DBDS consists of five areas:
sources, headend, transport network, hub, and access network.
demodulator
Receives information such as billing and performance monitoring data in a reverse path from
the DHCT and returns it to the DNCS for processing.
DHCT
Digital Home Communications Terminal. Our digital set-top that is two-way capable for
interactive services. See also Explorer.
DNCS
Digital Network Control System. A computer server that monitors and controls the DBDS
network elements; located at the DBDS headend or at a remote site.
DTV
Digital Television. A telecommunication system for broadcasting and receiving video and
audio by means of digital signals.
E
Explorer®
Our registered trademark name for the Digital Home Communications Terminal (DHCT).
Also known as a set-top box.
F
FAT Channel
See BFS.
FDC
Forward Data Channel. Carries digital data (tuning, management, Internet, and at least two
days of IPG data) in ATM cells on RF signals from the ATM switch to a router, which then
forwards the data to the correct network. Also known as out-of-band data channel.