![]() For example, the six-position physical connector, plug and jack, is identically dimensioned and inter-connectable, whether it is wired for one, two, or three lines. Strictly, Registered Jack refers to both the female physical connector ( modular connector) and specific wiring patterns, but the term is often used loosely to refer to modular connectors regardless of wiring, gender, or use, commonly for telephone line connections, but also for Ethernet over twisted pair, resulting in confusion over the various connection standards and applications. Modular connectors were developed to replace older telephone installation methods that used hardwired cords or bulkier varieties of telephone plugs. The same modular connector type may be used for different registered jack applications. The registered jack designations originated in the standardization process of telephone connections in the Bell System in the United States, and describe application circuits and not just the physical geometry of the connectors. 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, RJ11 and RJ14 use female six-position modular connectors, and RJ21 uses a 25-pair (50-pin) miniature ribbon connector. The connectors used for registered jack installations are primarily the modular connector and the 50-pin miniature ribbon connector. Although these standards are legal definitions in the United States, some interfaces are used worldwide. For example, RJ11, RJ14, and RJ25 are the most commonly used interfaces for telephone connections for one-, two-, and three-line service, respectively. Additional letter suffixes indicate minor variations. Accordingly, registered jacks are primarily named by the letters RJ, followed by two digits that express the type. The specification includes physical construction, wiring, and signal semantics. Registered jack connections began to see use after their invention in 1973 by Bell Labs. They were subsequently codified in title 47 of the Code of Federal Regulations Part 68. Registered interfaces were first defined in the Universal Service Ordering Code (USOC) system of the Bell System in the United States for complying with the registration program for customer-supplied telephone equipment mandated by the Federal Communications Commission (FCC) in the 1970s. Six-position, six-contact (6P6C) jack, which could be wired as RJ11, RJ14, or RJ25Ī registered jack ( RJ) is a standardized telecommunication network interface for connecting voice and data equipment to a service provided by a local exchange carrier or long distance carrier.Four-position, four-contact (4P4C) plug, used for connecting a telephone handset and base.Six-position, four-contact (6P4C) plug, which can be used with RJ14 and RJ11 (and will carry lines 1 and 2, but not line 3, of an RJ25).Six-position, six-contact (6P6C) plug, which can be used with RJ25, RJ14, and RJ11.Eight-position, eight-contact (8P8C) plug, as used for RJ45S, RJ49, RJ61, and others (though shown wired in a pattern incompatible with RJ61).
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