page_title: Registered jack
hierarchical_section_title: Registered jack
caption_attribution_description: English: Left to right, RJ connectors: eight-pin RJ-45 plug six-pin RJ-25 or RJ-12 plug four-pin RJ-11 or RJ-14 plug four-pin RJ-22 (RJ-10 or RJ-9) handset plug The middle two plug into the same standard six-pin jack, pictured. Français&#160;: Différents connecteurs de type RJ, de gauche à droite&#160;: connecteur 8P8C (8 positions, 8 contacts) utilisé pour RJ45, connecteur 6P6C utilisé pour RJ25 et RJ12, connecteur 6P4C utilisé pour RJ11 et RJ14, connecteur 4P4C utilisé pour RJ9, RJ10 et RJ22. À droite, une prise 6P6C utilisables avec les connecteurs RJ11, RJ14 et RJ25
context_page_description: A registered jack 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. Registration interfaces were first defined in the Universal Service Ordering Code 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 in the 1970s. They were subsequently codified in title 47 of the Code of Federal Regulations Part 68. Registered Jack connections began to see use after their invention in 1973 by Bell Labs.
  The specification includes physical construction, wiring, and signal semantics. Accordingly, registered jacks are primarily named by the letters RJ, followed by two digits that express the type. Additional letter suffixes indicate minor variations. For example, RJ11, RJ14, and RJ25 are the most commonly used interfaces for telephone connections for one-, two-, and three-line service, respectively. Although these standards are legal definitions in the United States, some interfaces are used worldwide.
context_section_description: A 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. 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. They were subsequently codified in title 47 of the Code of Federal Regulations Part 68. Registered Jack connections began to see use after their invention in 1973 by Bell Labs.
  The specification includes physical construction, wiring, and signal semantics. Accordingly, registered jacks are primarily named by the letters RJ, followed by two digits that express the type. Additional letter suffixes indicate minor variations. For example, RJ11, RJ14, and RJ25 are the most commonly used interfaces for telephone connections for one-, two-, and three-line service, respectively. Although these standards are legal definitions in the United States, some interfaces are used worldwide.
  The connectors used for registered jack installations are primarily the modular connector and the 50-pin miniature ribbon connector. 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.
caption: Left to right, modular connectors: eight-contact 8P8C plug used for RJ45S, RJ49, RJ61 and others.six-contact 6P6C plug used for RJ25four-contact 6P4C plug used for RJ14four-contact 4P4C handset plug6P6C jack, may be used for RJ11, RJ14, and RJ25.
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