Hi Charles.
> pins 1&2 are a pair
> pins 3&6 are a pair
That's correct. What I suspect has happenned is that one end is
wired with 3&6 as a pair, the other with 3&4 as a pair. That just
doesn't work, and leads to the one-way effect described...
> short cables wired 1-1, 2-2, 3-3, 4-4, 5-5,... will work.
> (<10meters?)
Assuming in all cases that 1&2 are from the same twisted pair,
experience has shown the following limits to usually apply:
1. Less than 5 metres with standard cable if 3&6 are not from
the same twisted pair.
2. Less than 10 metres with low capacitance and 3&6 not from
the same twisted pair.
3. Up to 250 metres with standard cable and 3&6 from the same
twisted pair.
4. Up to 450 metres low capacitance with 3&6 from the same
twisted pair.
That was obtained by trying to bridge the 500 metre run between
two classrooms at the school I admin for. Even when using low
capacitance cable, we discovered that it was slightly too far,
and we ended up dropping a hub in a staffroom about 2/3 the way
down the run, and putting separate cables in either side of it.
> If you only have two NICs, a 'crossover' cable is cheaper
> than two cables and a hub. :-|
True - and if you don't need 100 Mbps, 10baseT is far cheaper
than 10base2 for up to a dozen machines.
Best wishes from Riley GM7GOD / KB8PPG.
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* God Made 7 Greedy Old Devils
* Kilroy Bought 8 Personal Pregnancy Guides
