>> that the flanks (signal changes) will 'flatten':
>
>How do you know about this, and how do you explain it?

Some electronics expert told me :-)
Ultra-short explanation: longer line means higher capacity of the line
(in (micro)Farad, not in Baud :-)) and therefor 'slower' response of
the line to voltage level changes.

(It's exactly the same reason that the length of e.g. SCSI cables is
 limited)

Ciao,
        Eric

Note & Disclaimer: I haven't got the foggiest idea at which cable
lenghts these effects will actually occur. I guess this depends heavily
on cable diameter and IC specs (voltage ranges which define and distiguish
logical '0' and '1') etc...
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