North American Network Operators Group

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Re: E1 - RJ45 pinout with ethernet crossover cable

  • From: Miquel van Smoorenburg
  • Date: Sat Feb 26 09:25:28 2005
  • Distribution: cistron
  • Newsgroups: lists.nanog

In article <[email protected]>,
Miquel van Smoorenburg <[email protected]> wrote:
>In article
><[email protected]>,
>Sam Stickland  <[email protected]> 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
>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).