Cisco DNCS System Release 2.2 3.2 Guide De Montage
78-4003052-01 Rev G
129
C
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.
D
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.
E
EA
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.
F
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