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Ethernet Cat5 Cable (RJ-45) Pinout

Recording the pinouts for Ethernet Cat5 RJ-45 connectors, for straight thru and crossover cables. They are different than I expected. The two links (below) have colored sketches which may be easier to understand.




Note that the pinout according to the standard is not what I expected. Note the splitting of pair 3 (568B pinout) or pair 2 (568A pinout). What I was doing works, but I've only used it in 10 MBPS networks, I had better switch to the standard for my 100 MBPS links.

To make a standard (straight thru) cable, use the 568B pinout on each end.

To make a crossover cable, use the 568A on one end and the 568B on the other end.

Because the 568B pinout is used on both ends of a straight thru connection, I show the 568B pinout first.

Looking from the top (the surface opposite the plastic latch), with the connection (open end of the connector) pointed to your right, you can read from top (pin 1) to bottom (pin 8), just the way the tables are laid out.

If you only have four conductor cable, pins 1 (Rc+), 2 (Rc-), 3 (Tx+), and 6 (Tx-) are the essential pins. The Tx+ and similar designations are misleading, clearly what is transmit on one end is receive on the other end.

568B Pinout

568B Pinout (below): For both ends of a straight thru cable or one end of a crossover cable — View with latch down

    Cable End     Color   Pair     Pin  
  White-Orange Pair 2 1
C Orange Pair 2 2
A White-Green Pair 3 3
B Blue Pair 1 4
L White-Blue Pair 1 5
E Green Pair 3 6
  White-Brown Pair 4 7
  Brown Pair 4 8

568A Pinout

568A Pinout (below): For the other end of a crossover cable — View with latch down

    Cable End     Color   Pair     Pin  
  White-Green Pair 3 1
C Green Pair 3 2
A White-Orange Pair 2 3
B Blue Pair 1 4
L White-Blue Pair 1 5
E Orange Pair 2 6
  White-Brown Pair 4 7
  Brown Pair 4 8


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  • () RandyKramer - 13 May 2003
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Topic revision: r8 - 2010-06-06 - RandyKramer
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