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RJ11(C/W) 6P2C: Establishes a bridged connection for one telephone line (6P4C if power on second pair). In computers, it is often used for dial-up internet access. [7] RJ12(C/W) 6P6C: Establishes a bridged connection for one telephone line with key telephone system control ahead of line circuit RJ13(C/W) 6P4C: Similar to RJ12, but behind the ...
The 6P2C, 6P4C, and 6P6C modular connectors are probably best known for their use as RJ11, RJ14, and RJ25 non-powered registered jacks, respectively (and 6P4C and 6P6C for powered RJ11 and RJ14, power being delivered on the outer pairs). These interfaces use the same six-position modular connector body but have different numbers of pins installed.
For example, telephone cables in the UK typically have a BS 6312 (UK standard) plug at the wall end and a 6P4C or 6P2C modular connector at the telephone end: this latter may be wired as per the RJ11 standard (with pins 3 and 4), or it may be wired with pins 2 and 5, as a straight-through cable from the BT plug (which uses pins 2 and 5 for the ...
Typically it will have a 6P4C or 6P2C modular connector at the telephone end: this latter may be wired as per the RJ11 standard (with pins 3 and 4), or it may be wired with pins 2 and 5, as a straight-through cable from the BT plug (which uses pins 2 and 5 for the line, unlike RJ11, which uses pins 3 and 4).
The six position, commonly referred to as RJ11, and the eight position, commonly referred to as RJ45. The six position can be wired with two wires on pins 3/4, therefore an RJ11. This same plug can be wired with four wires on pins 3/4 and 2/5, thus becoming an RJ12, 13 or 14.
Looking at the variety of RJ11 and RJ14 telephone cables that I have for connecting from the wall socket to the actual phone, most (but not all!) seem to be wired with the pair wiring reversed from one end to the other: pins 3/4 will be red/green at one end and green/red at the other.