Telephone jack and plug
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A telephone jack and a telephone plug are electrical connectors for connecting a telephone set or other telecommunications apparatus to the telephone wiring inside a building, establishing a connectio
Modular connector 6P6C plug (left) and 6P4C jack (right)
Bell System Type 404A jack and type 283B plug (c. 1960)
Trimline telephone line cord with a Type 505A wall plug and modular set plug (mid-1960s)
Type 505A wall jack (1968)
Modular connector
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A 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.
Telephone jack and plug
…each contact. Modular connectors are specified for the registered jack (RJ) series of connectors, as well as for Ethernet and other connectors, such as 4P4C (4 position, 4 contacts) modular connectors, the de facto standard on handset cords, often improperly referred to as RJ connectors. Historically…
Left to right, modular connectors: 8P8C plug, 6P6C plug, 6P4C plug, 4P4C plug, 6P6C jack.
8P8C plug with contacts for solid wire (left) and stranded wire (right)
Contacts for solid wire (top left) and stranded wire (bottom right)
A modular plug crimping tool with exchangeable crimping dies