Wiring help?

Mikkel L. Ellertson mikkel at infinity-ltd.com
Tue Apr 4 16:03:33 UTC 2006


Tim wrote:
> 
> I wonder if the way some cables are formed makes it easier to wire it
> one way or another?  Hand wrangling the wires into the right place to
> crimp on a plug can be a right pain.  You've got untangle wires, cross
> some over others, and get them all to go into the plug the same
> distance.  It would have been a lot easier to do that if they'd come up
> with a wiring arrangement different from the current specs.  i.e. A pair
> on 1 & 2, the next on 3 & 4, the next on 5 & 6, the last on 7 & 8,
> instead of having the break apart pairs and straddle others.  I
> seriously doubt that would have degraded noise rejection.
> 
It has to do with backward compatibility. Remember, the same jacks
are used for more then Ethernet. One consideration is being able to
plug an RJ-11 plug into an RJ-45 jack. (Not really a good idea, as
it can bend the outside pins of the jack...) The center 4 pins on a
RJ-45 jack are the same as a RJ-11 jack.

Mikkel
-- 

  Do not meddle in the affairs of dragons,
for thou art crunchy and taste good with Ketchup!




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