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Tuesday, 11 April 2017

Remembering T586A, B and crossover - Beware my thought process

Clip back, B is current, Orange with Orange, Green with Blue, Blue with Green, Brown with Brown. One to Three, Two to Six. Straight to A, Cross to cross.

This may sound like madness, but it's my process of remembering T586A, B and crossover wiring using twisted pair ethernet cables.

So let's break it down:

"Clip back"
When looking at the Ethernet cable plug, the clip to secure it in a socket should be at the back (facing away from you), then looking at the lines, pin one is on your left.

"B is current, Orange with Orange, Green with Blue, Blue with Green, Brown with Brown."

Pin| T586B (The T586B standard is the current standard mainly in use)
---|--------
 1 |Orange White (Orange with)
 2 |Orange
 3 |Green White (Green with)
 4 |Blue
 5 |Blue White  (Blue with)
 6 |Green
 7 |Brown White  (Brown with)
 8 |Brown

So not too complicated, just keeping the flow. The next part might lose some of you...
"One to Three, Two to Six."

At this point, I need to visualise the eight pins of the older standard (T586A) side by side with this and draw a line between pin one to pin three and two to six from both sides to the other.

Which allows us to move on to "Straight to A, Cross to cross."

If the final intended end is T586A, go pin to pin down the remaining pins.

Or if the final intended end is a T586B crossover cable, cross the lines in a parallel fashion.
With this pattern in mind, I can remember how to wire any T586A/B/Crossover cable.

I've deliberately left out any pictures of connectors in this article to avoid focusing on the physical and encourage a reliance on the schematic of mnemonics in the mind that proves correct in all situations. Small information is beautiful.

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