Paul
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Hi,
I believe there are good reasons not to include these features and I don't think the mentioned protocols are comparable. SONET is a long-distance communication standard, 10GbE shoots for comparable applications (while also targeting the LAN market somehow) and SATA is a storage interface. More appropriate comparison would be USB or FireWire, I believe.
I believe HDMI uses minimum transition codes to keep the signal bandwidth requirements as low as possible. Based on this, scrambling would be a nonsense because it would destroy the code's frequency domain properties. The idea of HDMI is to achieve maximum distance (15m) over copper to keep the cable prices within reasonable bounds. I believe none of the mentioned protocols is able to achieve operation over comparable distances on copper links (possibly 10GbE would?).
Error correction, scrambling and data encoding always relate to tradeoffs in terms of bandwidth and/or latency. In the case of a DVD-TV link, you certainly don't want to spend money on optical fibers, so bandwidth is constrained. On the other hand, you want your image to stop right there when you hit the pause button, so latency is critical too. In that sense, I believe the HDMI spec may be a good solution to the problem. In comparison, SONET and 10GbE are not latency sensitive, while SATA could more easily accept compromise on the maximum distance during the specification process to alleviate bandwidth constraints.
Paul
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