On 23/01/2018 16:48, Grant Taylor via cctalk wrote:
On 01/23/2018 09:10 AM, Bill Gunshannon via cctalk wrote:
If you didn't locate the transceivers on those black marks you would have had terrible performance as that affects collisions.  Timing (among other things like grounding) was very important with that version of ethernet hardware.

It's my understanding that the marks (black bands or other markings on the sheath) were exactly one wavelength apart.  Which from what I remember ~> understand from my ham radio days is quite important.

No, that's quite wrong. The marks are every 2.5m (8.2 feet) wich IIRC is 1/19th of a wavelength apart, the point being to try to minimise the likelihood of connections being made where they'd suffer constructive (additive) interference and to prevent transceivers being too close together.

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Pete
Pete Turnbull

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