A Registered jack (RJ) is a standardized physical Network Interface — both jack construction and wiring pattern — for connecting telecommunications, or data equipment (commonly, a telephone jack) or computer networking equipment to a service provided by a local exchange carrier, a long distance carrier, or a data network in the case of the RJ45 connector. The standard designs for these connectors and their wiring are named RJ11, RJ14, RJ45, etc. These interface standards are most commonly used in North America, though some interfaces are used world-wide[citation needed].
The physical connectors that Registration Jacks use are of the modular connector type, except RJ21X which is a 25-pair Amphenol connector. For example, RJ11 uses a 6 pin 4 conductor (6P4C) modular plug and jack.
The physical connectors that Registration Jacks use are of the modular connector type, except RJ21X which is a 25-pair Amphenol connector. For example, RJ11 uses a 6 pin 4 conductor (6P4C) modular plug and jack.
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