Date: Mon, 16 Jan 2006 14:38:07 -0500
To: Christopher Friesen <cfriesen@nortel.com>
Cc: "Arne R. van der Heyde" <vanderHeydeAR@summitinstruments.com>,
       linux-kernel@vger.kernel.org, c-d.hailfinger.kernel.2004@gmx.net
Subject: Re: no carrier when using forcedeth on MSI K8N Neo4-F
Message-ID: <20060116193807.GW18970@csclub.uwaterloo.ca>
References: <43C7F35A.9010703@summitinstruments.com> <20060113222647.GB18972@csclub.uwaterloo.ca> <43C82BD5.2050904@nortel.com>
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From: lsorense@csclub.uwaterloo.ca (Lennart Sorensen)
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On Fri, Jan 13, 2006 at 04:38:13PM -0600, Christopher Friesen wrote:
> Lennart Sorensen wrote:
> 
> >Gigabit does NOT use cross over cables.
> 
> I don't think this is always true.  Some gigabit ports can autosense 
> polarity and are able to use standard cables.  Others require gigabit 
> crossover cables.

Hmm, it appears you are right.  I have never seen a non autosensing
gigabit port, so I thought it was part of the spec.  Given the pairs all
send and receive already it seemed like an obvious part to include in
the spec.

Certainly a cross over cable made for 10/100 mbit won't work.  It needs
the other two pairs swapped to.  Most store bought cross over cables
seem to only have 10/100mbit in mind when they were made.

Proper pinout appears to be:
1 <-> 3
2 <-> 6
4 <-> 7
5 <-> 8

Len Sorensen
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