Kathrein UFS 712si Operating Manual

Also see for UFS 712si: Notice d'utilisation

Contents

Kathrein UFS 712si Operating Manual Manual pdf 68 page image

68SHORT TECHNICAL GUIDEDISEQC™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 antennasystems.It is a single master/multi-slave system, i.e. there is only ever one master in the satellite system. All activitiesstart from the master.DISEQC™ COMPONENTSIf DiSEqC™ switching matrices are cascaded, the master receiver must transmit the DiSEqC™ signalseveral times, so that all DiSEqC™ multi-switches in the cascade receive their commands.These days, DiSEqC™ components (slaves) must be reverse compatible, i.e. respond to the analogueswitching 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™ commandfrom the master is received. All analogue switching criteria are then ignored.DVB MPEG-2DVB is the abbreviation for Digital Video Broadcasting. DVB-S refers to the transmission method(S = satellite). MPEG is the abbreviation for Moving Picture Experts Group, a working group thatformulates internationally applicable standards for the digital compression of video and audio. MPEG-2has established itself as the standard for compression of digital TV signals. MPEG-2 works up to a datarate of 100 Mbit/s.EB/NO RATIOThe Eb/No ratio is a measure of the signal to noise ratio of a digital signal. The value is not identical tothe C/N value familiar from analogue reception technology. At Eb/No values below 5 dB no reception isnormally possible.FECFEC is the abbreviation for Forward Error Correction. The FEC error rate corresponds to the Viterbi rate.CHANNEL PACKAGEThe channel package for a digital transponder normally includes several TV and radio channels. Eachchannel package has a fixed assignment for the transponder transmission frequency, for polarisation(horizontal or vertical), for the symbol rate and for the Viterbi rate or error rate.