An HDMI cable consists primarily of a set of shielded twisted pairs which carry video data, together with embedded audio, at extremely high bitrates. Its arrival created a few problems — while it’s heavily preferred by content-providers due to its support for digital copy protection schemes, it is not nearly as robust over distance runs as its analog predecessors, e.g., component video, were. It was created to run on balanced lines, in contrast to the professional digital video standard, SDI, which runs on coax, and this early design decision has made increasing the bandwidth of HDMI cable a difficult problem. On the plus side, in the great majority of simple installations, HDMI works trouble-free, and its “one-cable” approach to home theater interconnection has simplified the process of setting up most equipment racks.
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