RJ-11

RJ-11 (Registered Jack 11) is a physical interface often used for terminating twisted pair type cables. RJ stands for Registered Jack which is part of the United States Code of Federal Regulations. It has six positions with 4 pins (electrical connections) installed at positions 2,3,4 and 5.

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(T4 means 4th pair's tip wire, R2 means 2nd pair's ring wire, etc.)

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Most telephones are "single line" telephones and only connect to the center 2 pins ("line 1"), the red and green wires.

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"Two-line" telephones are also fairly common—one pushes a button to switch between "line 1" (the center 2 pins) and "line 2" (the outer pins).

Physical interface: REDIRECT electrical connector...

Registered Jack: RJ stands for registered jack. RJ-XX is a general term for electrical connector designs registered with the US Federal Communications Commission, including the RJ-11, RJ-14, RJ-25, RJ-48, RJ-61 and RJ-45 connectors....

United States: :For other uses, see US (disambiguation), USA (disambiguation), and United States (disambiguation)....