DETAIL OF RJ CONNECTORS: WHAT IS RJ11, RJ45 Etc..

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This article is about the registered jack (RJ) wiring standard. For other uses of modular connectors, see Modular connector.any doubts about this article anybody can contact Mr.Anil Kumar Lines/mailid :lines_anil@hotmail.com

Left to right, modular connectors:

• eight-contact 8P8C plug (used for RJ45S, RJ49, RJ61 and others)
• six-contact 6P6C plug used for RJ25
• four-contact 6P4C plug used for RJ14 (often also used instead of 6P2C for RJ11)
• four-contact 4P4C handset plug (also popularly called "RJ9", "RJ10", or "RJ22")

RJ11, RJ14, and RJ25 can be plugged into the same six-pin 6P6C jack, pictured.

A Registered Jack (RJ) is a telecommunication network interface for connecting voice and data equipment to a service provided by a local exchange carrier or long distance carrier. Registration interfaces were first defined in the Universal Service Ordering Code (USOC) system of the Bell System in the United States for complying with the registration program for customer-supplied telephone equipment mandated by the Federal Communications Commission (FCC) in the 1970s.^[1] They were subsequently codified in the Code of Federal Regulations Part 68.^[2][3][4]

standardized

The specification includes physical construction, wiring, and signal semantics. Accordingly, registered jacks are primarily named by the letters RJ, followed by two digits that express the type. Additionally, letter suffixes indicate minor variations. For example, RJ11, RJ14, and RJ25 are the most commonly used interfaces for telephone connections for one-, two-, and three-line service, respectively. Although these standards are legal definitions in the United States, some interfaces are used world-wide.

The connectors used for registered jack installations are primarily the modular connector and the 50-pin miniature ribbon connector types. For example, RJ11 uses a six-position two-conductor connector (6P2C), RJ14 uses a six-position four-conductor (6P4C) modular jack, while RJ21 uses a 25-pair (50-pin) miniature ribbon connector.