Cisco DNCS System Release 2.7 3.7 4.2 Guía De Instalación

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CVT

Code Version Table. A method for staging DHCTs. The CVT is a table that contains

information about download channels and information to map client release software

versions to specific DHCT types. The Broadcast File Server (BFS) broadcasts this information

once per second on every quadrature amplitude modulation (QAM) frequency and on the

quadrature phase shift keying (QPSK) frequency. If a DHCT does not have valid client release

software installed (such as new DHCTs), the DHCT searches QAM frequencies for software

download information. When the DHCT finds this information, it can begin to download

valid client release software.

DhctInstantHit

See instant hit.

DVR

digital video recorder. A device that records television programs without the use of videotape

and saves them to a hard drive located inside the recorder. The programs can then be

deleted, saved to a tape, or left on the hard drive. A DVR allows you to pause live broadcast

for interruption, such as creating your own instant replays. Also known as PVR.

Entitlement Agent. Data structures transmitted within messages having cryptographic

protection that authorize reception of service to a DHCT.

EMM

Entitlement Management Message. Contains information for a specific DHCT that enables it

to access secure services.

Explorer®

Cisco’s registered trademark name for the Digital Home Communications Terminal (DHCT).

Also known as a set-top box.

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.

Glossary