Most modular connectors are designed with a latching mechanism that secures the physical connection. Instead, cables are usually connected using a female-to-female coupler, having two jacks wired back-to-back. Other than telephone extension cables, cables with a modular plug on one end and a jack on the other are rare. Plugs are used to terminate cables and cords, while jacks are used for fixed locations on surfaces of walls, panels, and equipment. Modular connectors have gender: plugs are considered to be male, while jacks or sockets are considered to be female. In 1976, these connectors were standardized nationally in the United States by the Registration Interface program of the Federal Communications Commission (FCC), which designated a series of Registered Jack (RJ) specifications for interconnection of customer-premises equipment to the public switched telephone network (PSTN). Hardesty and coworkers, US 3699498 (1972) and US 3860316 (1975), followed by other improvements, were the basis for the modular molded-plastic connectors that became commonplace for telephone cords by the 1980s. For this purpose, Illinois Bell started installing modular telephone sets on a limited scale in June 1972. Driven by demand for multiple sets in residences with various lengths of cords, the Bell System introduced customer-connectable part kits and telephones, sold through PhoneCenter stores in the early 1970s. The first types of small modular telephone connectors were created by AT&T in the mid-1960s for the plug-in handset and line cords of the Trimline telephone. Likewise, the 4P4C connector is sometimes called RJ9 or RJ22 though no such official designations exist. Similarly, various six-position modular connectors may be called RJ11. It is common to use a registered jack number to refer to the physical connector itself for instance, the 8P8C modular connector type is often labeled RJ45 because the registered jack standard of that name specified 8P8C modular connectors. Registered jack designations describe the signals and wiring used for voice and data communication at customer-facing interfaces of the public switched telephone network. This includes the 6P2C used for telephone line connections and 4P4C used for handset connectors. The term modular connector arose from its original use in modular wiring components of telephone equipment by the Western Electric Company in the 1960s. Modular connectors are often referred to as modular phone jack and plug, RJ connector, and Western jack and plug. Probably the best-known applications of modular connectors are for telephone and Ethernet.Īccordingly, various electronic interface specifications exist for applications using modular connectors, which prescribe physical characteristics and assign electrical signals to their contacts. Many applications that originally used bulkier, more expensive connectors have converted to modular connectors. The convenience of prior existence for designers and ease of use led to a proliferation of modular connectors for many other applications. The Federal Communications Commission (FCC) mandated in 1976 an interface registration system, in which they became known as registered jacks. Modular connectors were originally developed for use on specific Bell System telephone sets in the 1960s, and similar types found use for simple interconnection of customer-provided telephone subscriber premises equipment to the telephone network. This is the common crimp type plug, of the same kind pictured above crimped onto a cable (with molded sleeve).Ī modular connector is a type of electrical connector for cords and cables of electronic devices and appliances, such as in computer networking, telecommunication equipment, and audio headsets. Left to right, modular connectors: 8P8C plug, 6P6C plug, 6P4C plug, 4P4C plug, 6P6C jack. JSTOR ( May 2023) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed.įind sources: "Modular connector" – news Please help improve this article by adding citations to reliable sources. A sealing ring is furnished to assure a liquid-tight seal when installing in non-threaded openings.įor additional information, including specifications, dimensions, and applications - please click on a part number listed below.This article needs additional citations for verification. A liquid-tight seal and superior pullout resistance is accomplished by just tightening the nut. These connectors have the largest cord range in the industry, so there are fewer items to stock. Furnished with sealing ring and locknut.Īrlington's Low Profile Cord Connector has a unique grommet with gripping fingers. Non-Metallic Low Profile Strain Relief Cord Connectors Arlington | Non-Metallic Low Profile Strain Relief Cord Connectors
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