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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.
BS 6312 431A plug, colloquially a British Telecom 4-wire male plug. British telephone sockets were introduced in their current plug and socket form on 19 November 1981 by British Telecom to allow subscribers to connect their own telephones. The connectors are specified in British Standard BS 6312. [ 1][ 2][ 3] Electrical characteristics of the ...
A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. [ 1] It is designed to reproduce speech of a quality that is understandable. [ 2] It is the physical wire or other signaling medium connecting the user's telephone apparatus to the telecommunications network ...
When used for plain old telephone service (POTS), the first wire is known as the tip or A-leg (U.K.) conductor, and is usually connected to the positive side of a direct current (DC) circuit, while the second wire is known as the ring lead or B-leg (U.K.), and is connected to the negative side of the circuit. Neither of these two sides of the ...
Four-position, four-contact (4P4C) plug, used for connecting a telephone handset and base. Six-position, six-contact (6P6C) jack, which could be wired as RJ11, RJ14, or RJ25. A registered jack ( RJ) is a standardized telecommunication network interface for connecting voice and data equipment to a computer service provided by a local exchange ...
Tip and ring. 1: Sleeve, 2: Ring, 3: Tip, 4: Insulators. Tip and ring are the two conductors or sides of a telephone line. Their names are derived from the telephone plugs used for connecting telephone calls in manual switchboards. One side of the line is connected to the metal tip of the plug, and the second is connected to a metal ring behind ...
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]
A twisted pair can be used as a balanced line, which as part of a balanced circuit can greatly reduce the effect of noise currents induced on the line by coupling of electric or magnetic fields. The idea is that the currents induced in each of the two wires are very nearly equal. The twisting ensures that the two wires are on average the same ...
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