[78274] in North American Network Operators' Group
Re: E1 - RJ45 pinout with ethernet crossover cable
daemon@ATHENA.MIT.EDU (Miquel van Smoorenburg)
Sat Feb 26 09:24:53 2005
To: nanog@merit.edu
From: "Miquel van Smoorenburg" <miquels@cistron.nl>
Date: Sat, 26 Feb 2005 14:24:26 +0000 (UTC)
X-Complaints-To: abuse@cistron.nl
Errors-To: owner-nanog@merit.edu
In article <cistron.cvn2v1$kc2$1@news.cistron.nl>,
Miquel van Smoorenburg <miquels@cistron.nl> wrote:
>
>In article
><cistron.Pine.WNT.4.61.0502251117300.4032@tech1.office.toastedmedia.net>,
>Sam Stickland <sam_ml@spacething.org> wrote:
>>Quick question: If I have two E1 ports (RJ45), then will running a
>>straight ethernet cable between the two ports have the same affect as
>>plugging a ballan into each port and using a pair of coax (over a v.
>>short distance).
>>
>>Likewise would using an ethernet crossover cable have the same affect as
>>swapping the pairs round on one balland.
>>
>>Or are the pinouts different to ethernet? I tried googling but couldn't
>>find anything (perhaps because I can't seem to spell ballan :/ ).
>
>The pinouts are different. It's easy to make your own E1 crosscable
>though.
>
>E1 uses pairs 4-5 and 3-6, just swap those.
>
> 4-5 <------------> 3-6
> 3-6 <------------> 4-5
I wrote this from memory, and I got it wrong. Sorry. It's not 4/5
and 3/6, but 1/2 and 4/5 (as others undoubtedly will point out).
Mike.
