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Cords connecting to an RJ11 interface require a 6P2C connector. Nevertheless, cords sold as RJ11 often use 6P4C connectors (six position, four conductor) with four wires. Two of the six possible contact positions connect tip and ring, and the other two conductors are unused. RJ11 is commonly used to connect DSL modems to the customer line.
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 ...
600 series connectors. A 600 series connector is an obsolete three-pin connector with up to six conductors.. It was for many years the standard telephone service connector in Australia, used on rural party lines and the national Postmaster-General's Department (later Telstra) landline network, but has since the 1970s been superseded by the six position modular connector in this application.
Equipment rooms house equipment and wiring consolidation points that serve the users inside the building or campus. Backbone cabling is the inter-building and intra-building cable connections in structured cabling between entrance facilities, equipment rooms and telecommunications closets.
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.
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. I am assuming that ordinary telephone equipment expects this.
In legacy on-premises wiring the first, or only, pair of inside wiring and jacks is color-coded in green for the tip conductor and red for the ring side. A second pair is coded in black for tip and yellow for ring. A third pair consists of white tip coding and blue ring coding.
The registered jack or modular jack in RJ11, RJ45 and other similar connectors used for telecommunications and computer networking; The telephone jack of manual telephone switchboards, which is the socket fitting the original 1 ⁄ 4 inch (6.35 mm) telephone plug