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What uses more power? Cable or Infrared

What actually uses more power for a hotsync between Outlook and a Palm? The direct cable over the serial port or using the Infrared port?
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I don't have the figures, but it is quite obvious that infrared uses a lot more power, because it requires a source of infrared radiation powered by the Palm. Serial connection, on the other hand, requires very little power, just enough to open or shut a tiny CMOS gate. I would guess that the difference between the two is orders of magnitude.

This is, of course, for transmission. There is only a negligible amount of power used for reception, in either case. Thus, infrared wireless Palm keyboard should not be any more taxing (on the Palm) than the wired one.

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