> Do you know of a 4 wire to 8 wire and back interface that can function at 
> 32 megabaud and doesn't cost 5 grand+?  Neither do I. :)  Laser diodes 
> and detectors that could handle 2x the video speed needed to hit an HDTV 
> transmitter would be required, times 4 to do it optically.
> 
> There are capacitatively coupled chips I have seen the announcements for, 
> intended to steal some of the jobs the MOC chips are doing, but no clue 
> as to their useable bandwidth. I'll see what google says.

The capacitance coupled chips are good, and rather cheap. Opto couplers are 
cheaper but a lot slower.

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