[LUNI] [OT] RJ45 568 A/B wiring scheme

[Trev Peterson]

It doesn't matter whether you use 586A or B.  586B tend to be used more
in commercial and 586A in residential.  As long as both ends are wired
to the same standard (or for that mean same color scheme of any kind)
you have a straight through cable (pin 1 to pin 1 ... pin 8 to pin 8).
A crossover cable is made from having one 586A end and one 586B end.

FYI: I sometimes plan and install structured wiring so I do have some
experience in this.

A switch to switch connection should be done using a crossover cable
unless the switch has auto mdi/mid--x (many newer ones do but older ones
don't).  This may be why you don't get a light (depending on age).

HTH

	Trev

On Mon, 2007-02-12 at 00:01 +0530, Arun K. Khan wrote:
> For ethernet LAN purposes does it make any difference whether the RJ45
> connectors are crimped per 568 A or B as long as both ends of the cable
> follow the same scheme?  I have noticed that ready made cables use the
> 568B scheme.
> 
> I have run 2 lengths of CAT5 (approx. 12m) from one end to another end
> of my house, both ends are crimped per 568A scheme (straight) and visual
> inspection and LAN wire testers check out OK.  
> 
> However, the LEDs for resp. ports do not light up when I connect two
> switches at each end of the cables.  Whereas, the port LEDs on the 2
> switches (side by side) light up using a 568B (straight) cable.
> 
> Suggestions what could be wrong with my cabling.
> 
> TIA,
> -- Arun Khan
> 
-- 
Trev Peterson
Advanced Reality
Email: trev at advanced-reality.com
Phone: +1 847 406 9018