CAT5 RJ-45 Cable Pin-Outs

Copied from http://www.tc.cc.tx.us/rj45_wiring_scheme.html and put here just in case their website removes it.

Eight Position (RJ-45) Modular Cable



T568B
(with clip down)
T568A
(with clip down)


  • UTP consists of 4 twisted pairs. The standard colors are:



    white/blue - blue
    white/orange - orange
    white/green - green
    white/brown - brown
  • Hub to Hub or
    Computer to Computer connection: one end T568A, other end T568B (Crossover Cable).
  • Hub to Computer connection: T568B on each end.

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