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> Usually it works. However it will not always work. It does not work
> between my laptop(with 3com 10mbps card) and i810
> BookPC(onboard 100mbps). I needed a crossover with all 8
> wires(extra 4 wires straight through).
>
> Note the 3com card has an 8 pin x-jack, with 6 wires on the jack,
> not 4 or 8! The extra wires go somewhere.

I suscpet that that was just an issue with a not terribly compliant
10/100 ethernet card.

> The link light goes on with 4 wires, but nothing else would work.

4 wires is all you need if you have 10Mbps at each end.

> Perhaps the 4 wire approach would work if the two computers
> shared ground.

As far as I know, ethernet is a differential protocol for the express
purpose of avoiding the issues involved with shared grounds.  The
grounds shouldn't matter.

- --Brendan

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