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Line 3: At the time of DirecTV's launch in [[1994]], the [[DVB-S]] digital satellite system in use in the majority of the world had not yet been standardised, the [[Thomson]] developed DSS system was used instead. While functionally similar in DVB-S - [[MPEG 2]] video, [[Musicam]] or [[AC3]] audio, [[QPSK]] modulation, and identical error correction ([[Reed-Solomon error correction\|Reed-Solomon coding]] and [[Viterbi]] [[forward error correction]]. However, the transport stream and information tables are entirely different tofrom those of DVB. Also unlike DVB, all DSS receivers are proprietary DirecTV reception units. DirecTV are now using [[DVB-S2]], the latest version of the DVB-S protocol, for [[HDTV]] services off the [[SPACEWAY-1]] satellite, however huge numbers of DSS encoded channels still remain.

Digital Satellite Service: Difference between revisions