[78228] in North American Network Operators' Group
RE: E1 - RJ45 pinout with ethernet crossover cable
daemon@ATHENA.MIT.EDU (Hannigan, Martin)
Fri Feb 25 10:51:44 2005
Date: Fri, 25 Feb 2005 10:49:54 -0500
From: "Hannigan, Martin" <hannigan@verisign.com>
To: "Alex Bligh" <alex@alex.org.uk>,
"Sam Stickland" <sam_ml@spacething.org>, <nanog@nanog.org>
Errors-To: owner-nanog@merit.edu
> -----Original Message-----
> From: Alex Bligh [mailto:alex@alex.org.uk]
> Sent: Friday, February 25, 2005 10:32 AM
> To: Hannigan, Martin; Sam Stickland; nanog@nanog.org
> Cc: Alex Bligh
> Subject: RE: E1 - RJ45 pinout with ethernet crossover cable
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> --On 25 February 2005 09:43 -0500 "Hannigan, Martin"=20
> <hannigan@verisign.com> wrote:
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> > Not that I know of, but I've never attempted what you
> > describe. Putting the baluns in the loop will destroy the
> > framing i.e. it's going to try and convert b8zs/ami to 802.x.
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> How does a balun destroy the framing (or rather line coding)?=20
> It's just a
> pair of transformers, and hence AC characteristics pass=20
> through intact.
> All you've done is converted impedance (and, IIRC, line voltage).
My mistake, I misunderstood their function.=20
-M<
