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(hardware, communications)
An American-style telephone jack with six possible connections. A telephone normally uses two pairs of wires. Often found on the back of US-manufactured modems or for connection to a leased line.
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(Registered Jack-11) A telephone interface that uses a cable of twisted wire pairs and a modular jack with two, four or six contacts. RJ-11 is the common connector for plugging a telephone into the wall and the handset into the telephone. See modular connector.

RJ-11, 14, 25 - One, Two and Three Lines
RJ-11 cables can hold six wires for up to three telephone lines, and their nomenclature is technically RJ-11, RJ-14 or RJ-25 depending on the number of lines (see chart below).

RJ-21X, RJ-26X and RJ-27X
For PBX and other telecom connections, RJ-21X, 26X and 27X cables use a 50-pin Centronics-style "Miniature Ribbon" connector to handle 25 telephone lines in one cable.

C and W
The C refers to a desk phone jack, such as RJ-11C, while RJ-11W means a wall-mounted jack. See modular connector.

RJ-11 Connectors
Four-wire RJ-11 connectors (6P4C) are commonly used for telephone handsets and wall outlets. The six-wire variation (6P6C) is used for three telephone lines (see below).

Jack Positions (P)RJ     U.S.                 andType   Wire Pair Colors    Contacts (C)

  RJ-11  Line 1 - red-green     6P2C

  RJ-14  Line 1 - red-green     6P4C
         Line 2 - yellow-black

  RJ-25  Line 1 - red-green     6P6C
         Line 2 - yellow-black
         Line 3 - blue-white
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References in periodicals archive ?
Entre as farmacias que apresentaram os melhores servicos foram selecionadas RJ8 (nivel 6), RJ12 (nivel 7) e RJ2 (nivel 8) e entre aquelas que apresentaram os piores servicos RJ14 (nivel 6), RJ9 (nivel 7) e RJ20 (nivel 8).
As informacoes sobre o consumo fisico de medicamentos eram atualizadas diariamente em duas unidades (RJ12 e RJ2), semanalmente em outras duas (RJ9 e RJ20) e mensalmente em uma (RJ14).
As unidades analisadas (RJ8, RJ9, RJ12, RJ14, RJ20) apresentavam os dois problemas.
Os problemas relativos as condicoes de trabalho, como espaco fisico insuficiente, ausencia de procedimentos escritos e falhas na disposicao dos medicamentos no setor (RJ8, RJ9, RJ12, RJ14, RJ20) parecem ter sido as principais causas de erros de distribuicao detectadas neste estudo.
The wall jack to use for the new line, called an RJ14 jack, is designated for one and two lines.