A registere jack (RJ) is a standardized physical interface--both jack construction and wiring pattern--for connecting telecommunications equipment (commonly, a telephone jack) or computer networking equipment to a service provided by a local exchange carrier or, sometimes, a long distance carrier. 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.