TechToolSupply.com :: RJ11 & RJ12 Termination
Wiring Configuration for RJ11 & RJ12 Modular Connectors

Wiring RJ11 and RJ12 Phone Plugs:

 

   Standard wiring for an RJ11 connector using 4 conductor phone line.  RJ11's wire pairs are made from inside out. Pair one (3&4) is the Red & Green. Pair 2 (2&5) is the Black & Yellow.
   Standard wiring for an RJ11 or RJ12 connector using Category 5.  RJ11's wire pairs are made from inside out. Pair one (3&4) is the blue pair. Pair 2 (2&5) is the orange pair. Pair 3 (1&6) is the Green Pair.