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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 programme pos.
Preferred programme slot on TV set for external
connections (such as HDMI)
CAM – Conditional Access Module
Decryption decoder, which uses a smart card
to decrypt the encrypted radio and TV signals.
Channel package
The channel package for a digital transponder
normally
includes
several
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 CA
modules
Conditional Access (CA) system
Controls
user
access
programmes which are encrypted for reasons of
copyright or for commercial reasons.
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
Redundant information is discarded.
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.
126
Short Technical Guide
TV
and
radio
to
services
and
and
audio
signals.
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
All analogue switching criteria are then ignored.
Dolby Digital 5.1
Dolby Digital is a sound transmission that allows
digital surround sound to be output on a home
cinema system.
DVB - Digital Video Broadcasting
DVB-S
refers
to
the
(S = satellite, C = cable, T = terrestrial).
DVB-S2
An enhanced DVB-S signal for HDTV with better
quality.
Eb/No ratio
The Eb/No ratio is a measure of the signal to noise
ratio of a digital signal. The value is not identical
to the C/N value familiar from analogue reception
technology. At Eb/No values below 5 dB no
reception is normally possible.
EUTELSAT
European Satellite operator, based in Paris.
Many orbit positions and European customers.
Transponders
in
10.7-12.75 GHz.
FEC
FEC is the abbreviation for Forward Error
Correction. A technique for reducing the error
rate of data transmission. Additional bits are
inserted into the data stream, so that error-
correction algorithms can be used on reception.
The
FEC
error
rate
Viterbi rate.
master
is
received.
transmission
method
the
frequency
range
corresponds
to
the
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