Digital Satellite Service is the assumed initialism expansion of the DSS digital satellite television transmission system used by DirecTV. Only when digital transmission was introduced did direct broadcast satellite (DBS) television become popular in North America, which has led to both DBS and DSS being used interchangeably to refer to all three commonplace digital transmission formats - DSS, DVB-S and 4DTV. Analog DBS services however existed prior to DirecTV and were still operational in continental Europe until April 2012.[1] 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, MPEG-1 Layer II or AC3 audio, QPSK modulation, and identical error correction (Reed-Solomon coding and Viterbi[disambiguation needed] forward error correction), the transport stream and information tables are entirely different from those of DVB. Also unlike DVB, all DSS receivers are proprietary DirecTV reception units. DirecTV is now using a modified version of DVB-S2, the latest version of the DVB-S protocol, for HDTV services off the SPACEWAY-1, SPACEWAY-2, DirecTV-10 and DirecTV-11[2] satellites, however huge numbers of DSS encoded channels still remain. The ACM modulation scheme used by DirecTV prevents regular DVB-S2 demodulators from receiving the signal although the data carried is regular MPEG-4 Transport Stream. See also[edit source | edit] * direct broadcast satellite References[edit source | edit] 1. ^ "AnalogueSat". Retrieved 2013-05-25. 2. ^ http://dtv.client.shareholder.com/releasedetail.cfm?ReleaseID=324646 External links[edit source | edit] * DSS, the "Other Other" MPEG-2 system Retrieved from "http://en.wikipedia.org/w/index.php?title=Digital_Satellite_Service&oldid=556716023" Categories: * Satellite television * Digital television Hidden categories: * Articles with links needing disambiguation from January 2012 Navigation menu Personal tools * Create account * Log in Namespaces * Article * Talk Variants Views * Read * Edit source * Edit * View history Actions Search Search Navigation * Main page * Contents * Featured content * Current events * Random article * Donate to Wikipedia Interaction * Help * About Wikipedia * Community portal * Recent changes * Contact page Toolbox * What links here * Related changes * Upload file * Special pages * Permanent link * Page information * Data item * Cite this page Print/export * Create a book * Download as PDF * Printable version Languages * Edit links * This page was last modified on 25 May 2013 at 11:39. * Text is available under the Creative Commons Attribution-ShareAlike License; additional terms may apply. By using this site, you agree to the Terms of Use and Privacy Policy. Wikipedia® is a registered trademark of the