RJ11 cable: standard telephone cable
Often considered a standard phone cable, RJ11 cable is almost always 6P4C (six position, four conductors), in which four wires run to a central junction box. Two of its six possible contact positions connect tip and ring and the other two conductors are then unused. One can also find 6P2C (six position, two conductors) and 6P6C (six position, six conductors) on the market. A RJ11 cable usually carries a single telephone line or channel.
By RJ11 we mean a physical interface which is often used for terminating telephone wires. It is a very familiar registered jack, which is used for single line POTS telephone jacks in most homes all over the world. RJ14 and RJ25 are similar, but they are for two and three lines respectively. RJ61 is a similar registered jack for four lines. The telephone line cord and its plug are more often a true RJ11 having just two conductors.
All these registered jacks contain several potential contact “positions” and the actual number of contacts installed within these positions. RJ11, RJ14, and RJ25 all use the same six-position modular connector, thus are physically identical except for the different number of contacts (two, four and six respectively).
In the powered version of RJ11, Pins 2 and 5 (black and yellow) may carry low voltage AC or DC power. Typically, the power on the two above mentioned Pins in these cables is supplied by a transformer plugged into a wall near one jack, providing power to all of the jacks in the house.
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