Registered jack
A registered jack (RJ) is a standardized telecommunication network interface for connecting voice and data equipment to a service provided by a local exchange carrier or long distance carrier.
Contents
Description
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.
They were subsequently codified in the Code of Federal Regulations Part 68.
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.
RJ45
The RJ45(S) jack is rarely used, but the designation RJ45 commonly refers to any 8P8C modular connector for application in computer networking, notably Ethernet.
See also
External links
- Registered jack @ Wikipedia
