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  2. British telephone socket - Wikipedia

    en.wikipedia.org/wiki/British_telephone_socket

    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 ...

  3. Telephone jack and plug - Wikipedia

    en.wikipedia.org/wiki/Telephone_jack_and_plug

    Telephone jack and plug. 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 ...

  4. 25-pair color code - Wikipedia

    en.wikipedia.org/wiki/25-pair_color_code

    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 ...

  5. Registered jack - Wikipedia

    en.wikipedia.org/wiki/Registered_jack

    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 ...

  6. Telephone exchange - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange

    A telephone switch is the switching equipment of an exchange. A wire center is the area served by a particular switch or central office. A concentrator is a device that concentrates traffic, be it remote or co-located with the switch. An off-hook condition represents a circuit that is in use, e.g., when a telephone call is in progress.

  7. GPO telephones - Wikipedia

    en.wikipedia.org/wiki/GPO_telephones

    The Telephone No. 706 was a revelation when it was first released in 1959. Again, still also available in CB (no dial) form, it was a robust design which is still in use today in the UK, suitably modified for use with the New Plan BT sockets. It was available in two-tone green, two-tone grey, topaz yellow, concorde blue, lacquer red, black and ...

  8. Demarcation point - Wikipedia

    en.wikipedia.org/wiki/Demarcation_point

    In the United States, the modern demarcation point is a device defined by FCC rules (47 C.F.R. Part 68) [1] to allow safe connection of third-party telephone customer-premises equipment and wiring to the Public Switched Telephone Network (PSTN). The modern demarcation point is the network interface device (NID) or intelligent network interface ...

  9. KX telephone boxes - Wikipedia

    en.wikipedia.org/wiki/KX_telephone_boxes

    The main telephone box in the KX range is the KX100. Upon launch, there were five models in total. The boxes were produced at a rate of 5,000 a year, with the total count of all BT-owned kiosks reaching 137,000 by 1999, a number which has since decreased by more than seventy per cent. Whilst the updated functions of the KX series were praised ...

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