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RJ is a kind of information socket (ie communication terminal) connector in the wiring system. The connector is composed of a plug (connector, crystal head) and a socket (module). The plug has 8 grooves and 8 contacts. RJ is the abbreviation of Registered Jack, which means "registered socket". In FCC (Federal Communications Commission Standards and Regulations), RJ is an interface describing public telecommunications networks, and RJ for computer networks is a common name for standard 8-bit modular interfaces.