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Short technical lexicon
transponder transmit frequency, the polarisation (horizontal or vertical), the symbol
rate and the viterbirate or error rate.
Symbol rate
The symbol rate describes the amount of data transmitted per second. The symbol
rate is measured in MSymbols/s and is equal to the number of symbols that are re-
ceived per second.
Transponder
A transponder is a satellite transmitter which transmits TV and radio signals. A
satellite has several transponders.
Analogue transponders transmit only one TV channel and possibly several radio
channels on their transmit frequencies.
Digital transponders simultaneously transmit several TV and several radio chan-
nels on their transmit frequencies. When a channel provider broadcasts several TV
channels via a digital transponder this is referred to as the channel package of the
channel provider. The terms "digital transponder" and "channel package" therefore
have the same meaning.
Video bit rate
The video bit rate describes the quantity of data of the digitised video signal that is
transmitted per second.
Viterbirate
The viterbirate (code rate, error rate) characterises the type of error protection used
by the channel provider. The DVB standard stipulates the following values: 1/2 -2/
3 - 3/4 - 4/5 - 5/6 6/7 - 7/8.
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