Registered Jack-11

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What Does Registered Jack-11 Mean?

A registered jack-11 (RJ-11) is a 6-position 2-conductor telephone connector/jack (6P2C) with 4 positions unused. In the United States, RJ-11 is commonly used to connect the telephone handset to the base unit, and the entire telephone to the wall outlet.

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A registered Jack-11 can also be used to connect LANs, but RJ-45 connectors are more commonly used for this purpose.

Techopedia Explains Registered Jack-11

Registered jack is a standardized construction and wiring pattern providing the physical interface for telecommunications or data equipment. Other standard designs include RJ-14, RJ-21, RJ-45 and RJ-48.

The "RJ" abbreviation actually only refers to the wiring of these types of jacks. However, the plug itself without wires is also referred to by these names, although this is technically incorrect.

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Margaret Rouse
Senior Editor
Margaret Rouse
Senior Editor

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.