Cisco Headend System Release 2.5

Glossary

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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.

Explorer®

Our registered trademark name for the Digital Home Communications Terminal (DHCT).

Also known as a set-top box.

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.