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  2. 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 ...

  3. 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 ...

  4. Modular connector - Wikipedia

    en.wikipedia.org/wiki/Modular_connector

    The first types of small modular telephone connectors were created by AT&T in the mid-1960s for the plug-in handset and line cords of the Trimline telephone. [1] Driven by demand for multiple sets in residences with various lengths of cords, the Bell System introduced customer-connectable part kits and telephones, sold through PhoneCenter stores in the early 1970s. [2]

  5. Telephone line - Wikipedia

    en.wikipedia.org/wiki/Telephone_line

    Utility pole with electric lines (top) and telephone cables. Fixed telephone lines per 100 inhabitants, 1997–2007. Cross section of telephone cable of 1,800 twisted pairs, 1922. A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. [1]

  6. Tip and ring - Wikipedia

    en.wikipedia.org/wiki/Tip_and_ring

    In the era of the telephone industry when rotary dial instruments were in use, the polarity when connecting a telephone set to the tip and ring wires was usually important only for properly ringing a telephone, especially in party line service with selective ringing, and for correctly identifying the calling customer on certain party lines for ...

  7. Who still owns a landline phone? You might be surprised at ...

    www.aol.com/still-owns-landline-phone-might...

    Landline cord-cutters: 'The young and the restless' ... Verizon and other fiber-optic providers often package service in a bundle: internet, cable television and a telephone line for one low price ...

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