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  2. Extension (telephone) - Wikipedia

    en.wikipedia.org/wiki/Extension_(telephone)

    In business telephony, a telephone extension may refer to a phone on an internal telephone line attached to a private branch exchange (PBX) or Centrex system. The PBX operates much as a community switchboard does for a geographic telephone numbering plan and allows multiple lines inside the office to connect without each phone requiring a ...

  3. Telephone jack and plug - Wikipedia

    en.wikipedia.org/wiki/Telephone_jack_and_plug

    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. In many residences, though, the boundary between utility-owned and household-owned cabling is a network interface on an outside wall known as the demarcation ...

  4. Modular connector - Wikipedia

    en.wikipedia.org/wiki/Modular_connector

    An 8P8C modular plug. This is the common crimp-type plug, of the same kind pictured above crimped onto a cable (with molded sleeve). A modular connector is a type of electrical connector for cords and cables of electronic devices and appliances, such as in computer networking, telecommunication equipment, and audio headsets.

  5. Off-premises extension - Wikipedia

    en.wikipedia.org/wiki/Off-premises_extension

    An off-premises extension (OPX), sometimes also known as off-premises station (OPS), is an extension telephone at a location distant from its servicing exchange.. One type of off-premises extension, connected to a private branch exchange (PBX), is generally used to provide employees with access to a company telephone system while they are out of the office.

  6. Telephone line - Wikipedia

    en.wikipedia.org/wiki/Telephone_line

    In most cases, two copper wires (tip and ring) for each telephone line run from a home or other small building to a local telephone exchange. There is a central junction box for the building where the wires that go to telephone jacks throughout the building and wires that go to the exchange meet and can be connected in different configurations ...

  7. USB hardware - Wikipedia

    en.wikipedia.org/wiki/USB_hardware

    The 24-pin double-sided connector provides four power–ground pairs, two differential pairs for USB 2.0 data (though only one pair is implemented in a USB-C cable), four pairs for SuperSpeed data bus (only two pairs are used in USB 3.1 mode), two "sideband use" pins, V CONN +5 V power for active cables, and a configuration pin for cable ...

  8. Lightning (connector) - Wikipedia

    en.wikipedia.org/wiki/Lightning_(connector)

    Apple Lightning to USB-A cable. Lightning is an 8-pin digital connector. Unlike the 30-pin dock connector it replaced (and USB Type-A and -B connectors), it is reversible. [23] Most Lightning devices only support USB 2.0, which has a maximum transfer speed of 480 Mbit/s or 60 MB/s. With USB 2.0, only one lane is in use at a time.

  9. Unbalanced line - Wikipedia

    en.wikipedia.org/wiki/Unbalanced_line

    A multicore cable able to support 25 unbalanced transmission lines. In telecommunications and electrical engineering in general, an unbalanced line is a pair of conductors intended to carry electrical signals, which have unequal impedances along their lengths and to ground and other circuits.

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