RJ11 vs RJ14 vs RJ25 vs RJ12 in Structured Cabling RJ 11 and RJ12 are two different standards in structured cabling. RJ11 is 6P4C type of wiring and RJ12 is 6P6C wiring standard. RJ is acronym to Registered Jack. RJ family has lots of standards like RJ9, RJ11, RJ12, RJ13, RJ14, RJ45, RJ48, RJ15, RJ61, […]