E1 - RJ45 pinout with ethernet crossover cable

Fri Feb 25 15:49:54 UTC 2005

> -----Original Message-----
> From: Alex Bligh [mailto:alex at alex.org.uk]
> Sent: Friday, February 25, 2005 10:32 AM
> To: Hannigan, Martin; Sam Stickland; nanog at nanog.org
> Cc: Alex Bligh
> Subject: RE: E1 - RJ45 pinout with ethernet crossover cable
> 
> 
> 
> 
> --On 25 February 2005 09:43 -0500 "Hannigan, Martin" 
> <hannigan at verisign.com> wrote:
> 
> > 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.
> 
> How does a balun destroy the framing (or rather line coding)? 
> It's just a
> pair of transformers, and hence AC characteristics pass 
> through intact.
> All you've done is converted impedance (and, IIRC, line voltage).

My mistake, I misunderstood their function. 

-M<