95
AC 3
Dolby digital signal
ASTRA
SES (Société Européene des Satellites) satellite
system. Analogue and digital transponders in the
frequency range 10.7-12.75 GHz.
AV channel slot
A preferred channel slot on the TV set for external
connections such as Scart and HDMI.
CAM – Conditional Access Module
Decryption decoder, which uses a Smartcard to
decrypt the encrypted radio and TV signals.
Channel package
The channel package for a digital transponder
normally includes several TV and radio
channels. Each channel package has a fi xed
assignment for the transponder transmission
frequency, for polarisation (horizontal or vertical),
for the symbol rate and for the Viterbi rate
or error rate.
CI – Common Interface
Internationally standardised interface for CI
modules.
CI+ - Common Interface
Further development of CI for CI+ modules.
Data rate
Data bits transmitted per second. Is expressed
in kbit/s or Mbit/s. The higher the data rate the
better the quality of the transmitted signal.
Data reduction
Compression of video and audio signals.
Redundant information is discarded.
DHCP
Dynamic Host Confi guration Protocol. This
features permits automatic integration into a
network.
Automatic assignment of the IP address, subnet
mask, standard gateway and DNS server. As
a result these parameters do not need to be
entered in a network in conjunction with a router.
DiSEqC™
DiSEqC™ (Digital Satellite Equipment Control)
is a communication system between a satellite
receiver (master) and the peripheral satellite
components (slaves), such as LNBs, multi-
switches, rotating antenna systems.
It is a single master/multi-slave system, i.e. there
is only ever one master in the satellite system.
All activities start from the master.
DiSEqC™ components
If DiSEqC™ switching matrices are cascaded,
the master receiver must transmit the DiSEqC™
signal several times, so that all DiSEqC™ multi-
switches in the cascade receive their commands.
These days, DiSEqC™ components (slaves)
must be downward compatible, i.e. respond to
the analogue switching criteria from receivers
that are only equipped with “H/V” and “22 kHz”
control signals.
A DiSEqC™ switching matrix will work with
analogue switching criteria until the DiSEqC™
command from the master is received. All
analogue switching criteria are then ignored.
DNS server
Domain Name System server. Is used to
determine IP addresses (other PCs or receivers)
within a network with DHCP function enabled.
Dolby Digital 5.1
Dolby Digital is a sound transmission process
that allows digital surround sound to be output
on a home cinema system.
DVB – Digital Video Broadcasting
DVB-S refers to the transmission method
(S = satellite, C = cable, T = terrestrial)
DVB-S2
An enhanced DVB-S signal for HDTV with better
quality.
EUTELSAT
European satellite operator, based in Paris.
Many orbit positions and European customers.
Transponders in the frequency range
10.7-12.75 GHz.
FAT and FAT32
File systems for storage media.
Brief technical glossary
Summary of Contents for UFS 946/CI+
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