The mandate termed these specifications registration interfaces, and the modular connectors became known as registered jacks, or RJ for short. Six-conductor RJ11 became the standard for connecting ...
Common types are 6P4C, 6P2C and 8P8C. The most common uses of modular connectors are for plugging a telephone into the wall outlet (RJ-11), as well as the cable that connects the handset with the ...