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  2. Modular connector - Wikipedia

    en.wikipedia.org/wiki/Modular_connector

    The connector provides power to the keyboard on the outer two contacts and receives data signals on the inner pair. The cable between the computer and the keyboard is a coiled cord with an appearance very similar to a telephone handset cable. [11] The connector on the Amiga 1000 uses crossover wiring, similar to a telephone handset.

  3. Telephone jack and plug - Wikipedia

    en.wikipedia.org/wiki/Telephone_jack_and_plug

    When modular connectors are used, the latch release of the connector should be on the ridge side of flat phone wire in order to maintain polarity. Though four wires are typically used in U.S. phone cabling, only two are necessary for telecommunication. In the event that a second line is needed, the other two are used.

  4. Electrical connector - Wikipedia

    en.wikipedia.org/wiki/Electrical_connector

    Ring style wire-end crimp connectors. The connectors in the top row of the image are known as ring terminals and spade terminals (sometimes called fork or split ring terminals). Electrical contact is made by the flat surface of the ring or spade, while mechanically they are attached by passing a screw or bolt through them.

  5. NEMA connector - Wikipedia

    en.wikipedia.org/wiki/NEMA_connector

    NEMA non-locking connectors all use blades of various flat and folded shapes (except for the round pins used on grounding connectors). The plugs can be detached from the receptacles by pulling back on the plug body. These connector families have been designed so that connectors of differing types cannot be accidentally intermated.

  6. Two-wire circuit - Wikipedia

    en.wikipedia.org/wiki/Two-wire_circuit

    Two-wire circuits in new installations are limited to intercom and military field telephone applications, though these too are being supplanted by modern digital communication modes. To communicate in both directions in the same wire pair, conversion between four-wire and two-wire was necessary, both at the telephone and at the central office .

  7. Electrical cable - Wikipedia

    en.wikipedia.org/wiki/Electrical_cable

    Electrical cable diagram Flexible mains cable with three 2.5 mm ... the installation of boxes constructed of ... type of cable is a flat two-wire line. It is commonly ...