George, it’s not clear who your last post was addressed to, but if it was addressed to the person who posted just above that post I think you may not have interpreted what he said as it was intended.
Geoff, thanks for the comprehensive response, although I’m not sure what the strawman argument was that I was attacking. BTW, when I referred to cable effects essentially all being proportional to length I should make it clear that I was referring to power wiring. While the same is also true for analog cables, it is not necessarily true for cables conducting digital signals. And in the case of digital cables, btw, I wouldn’t rule out the possibility that they might be at least slightly directional under some circumstances, due to reflection effects that may affect waveform quality, that may in turn affect jitter. That might occur if the cable’s "characteristic impedance" is not precisely the same at both ends, perhaps due to minor soldering differences in the two connectors. Directionality due to that kind of effect, however, would be system-dependent, unpredictable, and unrelated to the direction of any arrow that may be marked on the cable.
Regards,
-- Al
Geoff, thanks for the comprehensive response, although I’m not sure what the strawman argument was that I was attacking. BTW, when I referred to cable effects essentially all being proportional to length I should make it clear that I was referring to power wiring. While the same is also true for analog cables, it is not necessarily true for cables conducting digital signals. And in the case of digital cables, btw, I wouldn’t rule out the possibility that they might be at least slightly directional under some circumstances, due to reflection effects that may affect waveform quality, that may in turn affect jitter. That might occur if the cable’s "characteristic impedance" is not precisely the same at both ends, perhaps due to minor soldering differences in the two connectors. Directionality due to that kind of effect, however, would be system-dependent, unpredictable, and unrelated to the direction of any arrow that may be marked on the cable.
Regards,
-- Al