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  2. Public address system - Wikipedia

    en.wikipedia.org/wiki/Public_address_system

    At the transmission end, a PSTN Telephone, mobile phone, VOIP phone or any other communication device that can access and make audio calls to a GSM-based mobile SIM card can communicate with it. At the receiving end, a GSM transceiver receives these network transmissions and reproduces the analogue audio signal via a Power Amplifier and speaker.

  3. Bell System Practices - Wikipedia

    en.wikipedia.org/wiki/Bell_System_Practices

    The content could be general descriptive information, information on wiring and connections, test procedures, or piece-part replacement and repair information. The BSP documents were produced in primarily two formats, 8 1/2"x11" pages for use in office environments, and in a small, portable format (4" x 6 7/8") for use by installers on the job ...

  4. Serving area interface - Wikipedia

    en.wikipedia.org/wiki/Serving_area_interface

    The SAI provides the termination of individual twisted pairs of a telephony local loop for onward connection back to the nearest telephone exchange (US: "central office" (CO)) or remote switch, or first to transmission equipment such as a subscriber loop carrier multiplexer and then to the exchange main distribution frame (MDF).

  5. Network interface device - Wikipedia

    en.wikipedia.org/wiki/Network_interface_device

    In telecommunications, a network interface device (NID; also known by several other names) is a device that serves as the demarcation point between the carrier's local loop and the customer's premises wiring. Outdoor telephone NIDs also provide the subscriber with access to the station wiring and serve as a convenient test point for ...

  6. Telephone jack and plug - Wikipedia

    en.wikipedia.org/wiki/Telephone_jack_and_plug

    The installation of a conventional wired telephone set has four connection points, each of which may be hardwired, but more often use a plug and socket: telephone line to phone cord: The wall jack. This connection is the most standardized, and often regulated as the boundary between an individual's telephone and the telephone network.

  7. Red telephone box - Wikipedia

    en.wikipedia.org/wiki/Red_telephone_box

    The red telephone box is a telephone kiosk for a public telephone designed by Sir Giles Gilbert Scott, the architect responsible for Liverpool Cathedral. The telephone box is a familiar sight on the streets of the United Kingdom , its associated Crown Dependencies , British Overseas Territories and Malta .

  8. Telephone exchange - Wikipedia

    en.wikipedia.org/wiki/Telephone_exchange

    Telephone switches are a small component of a large network. A major part, in terms of expense, maintenance, and logistics of the telephone system is outside plant, which is the wiring outside the central office. While many subscribers were served with party-lines in the middle of the 20th century, it was the goal that each subscriber telephone ...

  9. British telephone socket - Wikipedia

    en.wikipedia.org/wiki/British_telephone_socket

    A domestic single British telephone line installation will have a single master socket or line box in the premises, which is provided by BT or another service provider: this socket is the demarcation point between the customer-owned and maintained on-premises wiring, and the telephone network.

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