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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, RJ11 and RJ14 use female six-position modular connectors, and RJ21 uses a 25-pair (50-pin) miniature ribbon connector. RJ11 uses two conductors in a six-position female modular connector, so can be made with any female six-position modular connector, while RJ14 uses four, so can be made with either a 6P4C or a 6P6C connector.
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 ...
The design is used only by Televerket (now Telia Company) in Sweden and older Póstur og Sími (now Síminn) installations in Iceland (RJ11 and a data/voice standard using an 8P8C modular connector are used in more recent buildings). Neither plug nor socket is compatible with other plugs and sockets. It is defined in Swedish Standard SS 455 15 50.
The Malaysian Telecommunications Department (now Telekom Malaysia) and Telecommunication Authority of Singapore (now Singtel) adopted Bell System-style 6P2C plugs and 6P4C "RJ11" sockets in the 1970s, with Ireland's P&T (now Eir) doing so (but with 6P6C instead of 6P4C sockets) slightly later, some time before BS 6312 was rolled out by BT in ...
The Modified Modular Jack (MMJ) is a small form-factor serial port connector developed by Digital Equipment Corporation (DEC). It uses a modified version of the 6P6C modular connector with the latch displaced off-center so standard modular connectors found on Ethernet cables or phone jacks cannot accidentally be plugged in. MMJ connections are used on Digital minicomputers, such as the PDP-11 ...