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. For example, RJ11 uses a six-position two-conductor connector ( 6P2C), RJ14 uses a six-position four-conductor ( 6P4C) modular jack, while 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. Registration 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. 6P6C jack, may be used for RJ11, RJ14, and RJ25.Ī 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. eight-contact 8P8C plug used for RJ45S, RJ49, RJ61 and others.
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