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Freqently Questions – COMSYS
MDR Communication , Tamilnadu, India.
info@comsys.in
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A LNB (acronym which stands for Low Noise Block Downconverter) is a device composed of a feed horn, a polarizer and a converter.


Placed in the receiving satellite dish focus, it is employed to convert the satellite signals transmitted in KU band (typically from 10700 MHz to 12750 MHz) in a lower frequency band (950-2150 MHz), the so-called 1 IF (First Intermediate Frequency) , thus allowing the distribution of satellite signals to the decoders using a coaxial cable.

DVB-T2 (second generation DVB-T) is a standard for the broadcast transmission of digital terrestrial television which includes part of DVB-T technology , first of all OFDM multicarrier modulation and QAM constellations, to which combines innovative elements, such as the subdivision of the data and the channel coding typical of DVB-S2 standard.


Thanks to a more efficient use of the frequency spectrum, DVB-T2 allows to increase the number of SD or HD services within a single MUX.

The system for satellite broadcasting DVB-S2 (Digital Video Broadcasting – Satellite – Second Generation) is the first second-generation system defined by the DVB European consortium, used today by many broadcasters for satellite transmission of digital high-definition (HD) signals. Evolution of the DVB-S standard, it is designed not only for broadcasting services for TV and HDTV, but also for interactive applications for home and business customers. The system provides for the transmission of one or more digital audio/video streams, using a QPSK or MAPSK modulation system

DVB-C2 (Digital Video Broadcasting – Cable – Second Generation) is a DVB European consortium standard for the broadcast transmission of digital television over cable, born in the wake of two other second-generation standards, DVB-S2 and DVB-T2. DVB-C2, , which is the result of the evolution of the DVB-C standard and the GSE protocol (Generic Stream Encapsulation), extends constellations up to 4k-QAM and introduces maximum allocation flexibility in available channel band.

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