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Re: E1 - RJ45 pinout with ethernet crossover cable

  • From: Miquel van Smoorenburg
  • Date: Fri Feb 25 07:40:55 2005
  • Distribution: cistron
  • Newsgroups: lists.nanog

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

(Oh it's "balun", from BALanced/UNbalanced, but you don't need one)