Amazon - Rj11 - Sconti su Rj11 AdSpedizione gratis (vedi condizioni) RJ11 Phone to RJ45 Jack - Tom Builds Stuff RJ11 Phone to RJ45 Jack Cat6 cable is frequently used for wiring telephone jacks. Taking a close look at the wiring diagram it appears to follow T568B on the Telephone RJ11 Wiring Reference - wikitz RJ-11 Plug Wiring. The RJ-11 connector has six terminals on it. Typically, only the middle 4 are used. Line 1 is the center pair, red and green.