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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 connection to a telephone network. The plug is inserted into its counterpart, the jack, which is commonly affixed to a wall or baseboard. The standards for ...
C: flush-mount or surface mount; F: flex-mount; W: wall-mount; L: lamp-mount; S: single-line; M: multi-line; X: complex jack; For example, RJ11 comes in two forms: RJ11W is a jack from which a wall telephone can be hung, while RJ11C is a jack designed to have a cord plugged into it. A cord can be plugged into an RJ11W as well.
The Trimline base was available in desk-top and wall-mount versions. The handsets and bases were interchangeable. The Trimline was the first US telephone to achieve design recognition in Europe, where it was referred to as the "Manhattan" model or the "Gondola". [citation needed] Today, similarly designed telephones are sold by many companies ...
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. [1] 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. [2]
The origin of the "Keystone" module may be traced back to US Patent 4261633 of Aug 27, 1979 for a "Wiring module for telephone jack" - by Amp Incorporated. [1] The module referred to in that patent was affixed by "A pair of diagonally inclined mounting flanges (which) include stepped, panel bearing surfaces .. at the outer free ends thereof."
In the latter role, they were soon replaced by coaxial DC power connectors. 2.5 mm phone jacks have also been used as headset jacks on mobile telephones (see § Mobile devices). The 1 ⁄ 8 in and 1 ⁄ 10 in sizes, approximately 3.5 mm and 2.5 mm respectively in mm, though those dimensions are only approximations. [ 26 ]