Re: making cables - what am I doing wrong?
- From: info_at_telecom-gear_dot_com@xxxxxxx (telecom-gear.com)
- Date: Mon, 03 Apr 2006 13:46:46 GMT
meshko@xxxxxxxxx wrote:
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.
The cables you are using should get you 1Gbit/s no problem. Sounds like
you might be making a straight-through cable without actually placing all
conductors into their standard-defined positions. Check your color code
with either T568A or T568B pinouts:
http://www.cabling-design.com/references/pinouts/t568ab.shtml
and make sure you use the same pinout on both ends of the cable. One other
thing: very often people use heads designed for stranded cable on a solid
conductor one. This usually results in higher attenuation, but could
actually have other symptoms as well. Check with the supplier of your
plugs - make sure you are using the correct type for your cable.
Cheers!
Dmitriy
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