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6. Definition of terms concerning satellite reception
This compendium was prepared with the aid of the Internet website www.wikipedia.de
You can find further information concerning this subject on the same webpage.
DiSEqC - Digital Satellite Equipment Control
describes a digital control signal technology, applied in the building cabling of
satellite reception facilities, DiSEqC-control signals compared to the 14/18-
Volt- and 22-kHz control signals enable broader range of functions in satellite
reception.
DiSEqC switching commands are transmitted serially as digitally encrypted
data words.
22kHz Switchbox – Switch for two satellites
22kHz Switchbox is an electronic switch which is controlled with a 22kHz
signal from the satellite receiver. The switch can be found between the
receivers and the satellite equipment. Attention! When this point is not
properly configured, it could happen that only one satellite will be found in a
search (usually the satellite which is connected to the first port (0kHz) of the
switchbox).
Toneburst
To obtain another switch criterion (along with 14/18 volt and 22 kHz) tone
burst was introduced. Here only one sequence of bits (e.g. "0" = satellite A or
"1" satellite B) is modulated onto the 22 kHz signal.
Highband 22kHz signal
The 22kHz signal is required for switching between lower and upper sideband.
Thus the 22kHz signal is another switch criterion (along with 14/18 Volt) and is
transmitted by the satellite receiver to the multiswitch/LNB.
Toneburst switchbox - switch for two satellites