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  2. Telephone switchboard - Wikipedia

    en.wikipedia.org/wiki/Telephone_switchboard

    PBX switchboard, 1975. A telephone switchboard is a device used to connect circuits of telephones to establish telephone calls between users or other switchboards. The switchboard is an essential component of a manual telephone exchange, and is operated by switchboard operators who use electrical cords or switches to establish the connections.

  3. Telephone jack and plug - Wikipedia

    en.wikipedia.org/wiki/Telephone_jack_and_plug

    For example, telephone cables in the UK typically have a BS 6312 (UK standard) plug at the wall end and a 6P4C or 6P2C modular connector at the telephone end: this latter may be wired as per the RJ11 standard (with pins 3 and 4), or it may be wired with pins 2 and 5, as a straight-through cable from the BT plug (which uses pins 2 and 5 for the ...

  4. Telecommunications equipment - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_equipment

    Telecommunications equipment (also telecoms equipment or communications equipment) is a type of hardware which is used for the purposes of telecommunications. Since the 1990s the boundary between telecoms equipment and IT hardware has become blurred as a result of the growth of the internet and its increasing role in the transfer of telecoms data.

  5. Telecommunications - Wikipedia

    en.wikipedia.org/wiki/Telecommunications

    Overall, a basic telecommunication system consists of three main parts that are always present in some form or another: A transmitter that takes information and converts it to a signal; A transmission medium, also called the physical channel, that carries the signal (e.g., the "free space channel")

  6. Telephone - Wikipedia

    en.wikipedia.org/wiki/Telephone

    A mobile phone or cellphone or hand phone is a handheld telephone which connects via radio transmissions to a cellular telephone network. The cellular network consists of a network of ground based transmitter/receiver stations with antennas – which are usually located on towers or on buildings – and infrastructure connecting to the global ...

  7. Tip and ring - Wikipedia

    en.wikipedia.org/wiki/Tip_and_ring

    Telephone carriers provide DC potential (voltage) on telephone lines for the operation of analog telephone service at customer locations. This supply is referred to as battery owing to the history of achieving this with the use of electrochemical batteries. The potential supplied is a compromise between operational needs for reliable service ...