SMS system is mainly made up of database management system andCallCenter. Set out charging standard of programs and charge at users.Register and manage users’ information.SMS system is the heart of DTH system, which is mainly to complete the following functions: The DTH Company inAmericaandCanadaadopt more appropriate special DBS with high power. Because of technique and cost etc, some DTH systems adopt communication satellite with high power. Its transmitting method mainly consists of midband transmitting and digital baseband transmitting.ĭTH system adopts DBS with high power or communication satellite. Transmitting and Uplink system includes the communication equipment from headend to uplink terminal and uplink equipment. According to MPEG-2 standard, DTH compresses the Video and Audio signal, this can transmit up to 10 sets TV programs on a 27MHz transponder with dynamic statistical multiplexing technique. The main function of headend system is to do digital coding and compression, which uses statistical multiplexing technique to transmit more programs on restricted satellite transponder band. Headend system is mainly composed of Video Audio Compression Encoder, MUC etc. The Dish Network of American DTH company newly grew also adopts this DVB standard. But the DVB standard is gradually used widely throughout the world. ![]() ![]() ![]() There are two standards for DTH internationally: European standard DVB-S and American standard DigiCipher.
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