making cables - what am I doing wrong?



I'm making ethernet cables which don't quite work and it's drivign me
crazy.
I can't quite explain under what conditions they work and don't work.
It seems that they do work with almost all (or juts all) 10 mbit boards
but don't work with the newer 100mbit boards. I've used two different
sources of cat 5e cable, in one case it's not clerly labeled for speed,
in the other it says that it was tested for Gigabit networks. Results
are the same. So it must be the heads I'm using? Is this even
possible? Or could it be the crimper? Because I've tried heads from
two different sources -- doesn't seem to make a difference.
When I plug such cable between a 100mbit Linksys router and a 100mbit
PCMCIA card the light on the switch goes on for couple of seconds,
blinking very-very fast and then disappears. If I replace the PCMCIA
card with an old one 10mbit card it works fine.
Please help, I'm getting scared.

.



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