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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 ?
The RD-10 offers an optional RJ11 telephone interface for control/monitoring applications where a phone line is available.
Depending on the application (video conferening, remote LAN bridging, work-at-home units) the TA has plugs for RS232, V35, and/or RJ11 cables.
Some of the newest products in the Megahertz line, which was showcased at PC Expo in New York last month, include the addition of the patented XJACK connector system to its PCMCIA Ethernet modem, making it the only Ethernet/modem combination card on the market with a built-in, extendable RJ11 jack for the modem.
Inside the buildings, each user would have a dual RJ11 connector, one for telephone and the other for data.
Others incorporate an RJ11 connection into which any standard phone device can be plugged for exclusive operation over cellular, the priority phone feature.
Every IOLAN SCG M Secure Console Server also comes with an on-board RJ11 V.92 modem connection for a secure and reliable out-of-band connection over the POTS network.
(NASDAQ: CALL) s that the newest product has been modified to include two USB slots, one USB plug, a SD micro slot, one RJ11 jack and one RJ45 jack.
The sensors are connected over total wiring length of 10 meters, standard phone cables and RJ11 or RJ12 are suitable.