The distribution links are all of those used in the process at the headwaters of broadcasting, to transport digital signals of audio, video and data to the end user, governing global mode by the regulations and recommendations of the DVB. In the encoding of the video signal, taking advantage of the characteristics of the human visual perception system, which is less sensitive to color than luminance, 4:2:0 encoding profiles are used. These profiles reduce part of the color information and therefore reduce the bandwidth needed for your coding and transmission. Encodings are used more aggressive with lower bit rates, which although they are not advised in Multi-generacion processes (as described in the contribution section), maintains quality standards suitable for viewing by the end user. Therefore, it is important to consider that the distribution is the final process to the video signal, and on this not must be held new encoding process which as we have seen in the part of contribution, this is where further loss of quality encoding 4:2:0 against another differentiating point of the distribution link 4:2:2, is that in this part of the chain, it is necessary to insert additional service information to be diffused in the so-called Multiplex digital, such as ATSC/DVB/ISDB tables, Teletext, signaling AFD, etc. Sapec has both for encoding H.264 MPEG-2 encoding and decoding equipment with 4:2:0 profiles.
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