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Old 05-04-2008, 01:34 AM
Jeff Liebermann
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Default Re: Ethernet connection sensitive to cable length

On Sat, 03 May 2008 20:22:07 GMT, Robert Redelmeier
<redelm@ev1.net.invalid> wrote:

>These homebuilt cables, which wiring pattern did you use?
>T-568A or -B ? If you don't know what I'm talking about,
>it is highly likely you split a pair.


Huh? Unless he did something really disgusting, like EIA-568A on one
end and EIA-568B on the other, either wiring standard will work. The
color codes are different, but the pairing is identical.

Drivel: I once had some hired help in wiring a medical office. I did
568B while my hired help did 568A wiring. Nothing worked when we were
done. Never ignore the obvious.

>Please do not complain "but the other comp works".
>Difference NICs and drivers are more error-tolerant
>and have more robust fall-backs.


True. I recently demonstrated that I can run 10baseT-HDX (half
duplex) through 2,000 ft of CAT5e (two rolls in series), without any
data degradation. If I had a 3rd roll, I would have added it. The
catch is that it would only work between my Cisco 1900 ethernet
switch, and a desktop with an Intel Pro100 card. It would function to
other devices (several laptops, assorted junk around the office), but
these showed various errors in the switch SNMP logs.

>Electrons may be color blind, but they _do_ know
>who their dance [twist] partners are.


Perhaps a matchmaker would be appropriate?

>-- Robert


See item #6:
<http://www.LearnByDestroying.com/nooze/support.txt>

--
Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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