On Thu, 13 Apr 2000, John P. Looney wrote:
The extra wires are just grounding wires. As the bus runs at a higher
frequency, there is more crosstalk/interferenece between data cables, so
wrapping an extra ground wire around each one reduces that a lot (like the
way twisted pair works).
twisting a ground wire around a signal wire is next to useless. (in
fact it might make things worse because of inductance).
it's only useful if the second wire carries the exact same signal but
inverted. so presumably this is what the extra wires are doing.
Paul Jakma paul at clubi.ie
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