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8PSK (8-Phase-Shift-Keying)
Digital modulation process used for HDTV satellite
transmission
AC 3
Output for 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
Preferred channel slot on TV set for external con-
nections such as Scart and HDMI
CAM - Conditional Access Module
Decryption decoder, which uses a smart card to
decrypt the encrypted radio and TV signals.
CI - Common Interface
Internationally standardised interface for CA mo-
dules
CI+ - Common Interface
Further development of CI for CI modules
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 polari-
sation (horizontal or vertical), for the symbol rate
and for the Viterbi rate or error rate.
Composite colour video signal
Colour baseband signal for the transmission of
colour video signals
DHCP
Dynamic Host Confi guration Protocol. This per-
mits 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.
DNS server
Domain Name System server. This is used to
determine IP addresses (other PCs or receivers)
within a network with the DHCP function enabled.
Brief Technical Glossary
DVB - Digital Video Broadcasting
DVB-S refers to the transmission method (S = sat-
ellite, C = cable, T = terrestrial).
DVB-S2
An enhanced DVB-S signal for HDTV with better
quality.
Data rate
Data bits transmitted per second. This 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. Redun-
dant information is discarded.
DiSEqC™
DiSEqC™ (Digital Satellite Equipment Control)
is a communication system between a satellite
receiver (master) and the peripheral satellite com-
ponents (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 ana-
logue switching criteria from receivers that are only
equipped with H/V and 22 kHz control signals.
A DiSEqC™ switching matrix will work with ana-
logue switching criteria until the DiSEqC™ com-
mand from the master is received. All analogue
switching criteria are then ignored.
Dolby Digital 5.1
Dolby Digital is a sound transmission method that
allows digital surround sound to be output on a
home cinema system.
EUTELSAT
European Satellite operator, based in Paris. Many
orbit positions and European customers. Tran-
sponders in the frequency range 10.7-12.75 GHz.
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