Kathrein UFS 640si Operating Manual

Contents

75SYMBOL RATEThe symbol rate describes the quantity of data that is transmitted per second. The symbol rate is measuredin MSymbols/s and is equal to the number of symbols received per second.VIDEO-BIT-RATEThe video bit rate describes the quantity of data from the digitised video signal that is transmitted persecond.VITERBI RATEThe Viterbi rate (code rate, error rate) characterises the error protection used by the programme provider.The DVB standard provides the following values: 1/2 - 2/3 - 3/4 - 5/6 - 7/8SHORT TECHNICAL GUIDETRANSPONDERA transponder is a frequency converter which receives TV and radio signals broadcast from the earth,converts them and the rebroadcasts them to the earth at a different frequency. Each satellite carriesseveral transponders.Analogue transponders transmit only one TV channel and possibly multiple radio channels on a singletransmission frequency.Digital transponders simultaneously transmit several TV and several radio programmes on a transmissionfrequency. If a programme provider is broadcasting several TV channels via a digital transponder, we referto the provider's channel package. The terms “digital transponder” and “channel package” have the samemeaning.PIDThe PID (Packet IDentification) number is an identification number for video signals and audio signals inthe digital data stream of DVB-MPEG -2 signals. The receiver uses the PID number to create a uniqueassignment for the video and audio data transmission. The PCR PID is the identification number for thesynchronisation signal. The PID-PCR is normally identical to the video PID. For programmes broadcastin multiple languages, the audio PD can be entered manually to assign a different language to the TVprogramme. After the PID is entered, the digital receiver automatically selects the audio data identified bythe PID number from the data stream and assigns it to the video signal.