E1 - RJ45 pinout with ethernet crossover cable

Fri Feb 25 11:42:25 UTC 2005

In article <cistron.Pine.WNT.4.61.0502251117300.4032 at tech1.office.toastedmedia.net>,
Sam Stickland  <sam_ml at 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

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

Mike.