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  2. Telephone hybrid - Wikipedia

    en.wikipedia.org/wiki/Telephone_hybrid

    The need for hybrids comes from the nature of analog plain old telephone service (POTS) home or small business telephone lines, where the two audio directions are combined on a single two-wire pair. Within the telephone network, switching and transmission are almost always four-wire circuits with the two signals being separated. Hybrids perform ...

  3. Line2 - Wikipedia

    en.wikipedia.org/wiki/Line2

    The Line2 app was submitted to the Apple App Store on June 5, 2009. It was developed with the goal of providing users with two different phone lines. One would be a personal line, the other used for business. This would allow users to keep any personal numbers private, as well as applying professional business features to the other line.

  4. Business telephone system - Wikipedia

    en.wikipedia.org/wiki/Business_telephone_system

    Using small PBXs for ISDN is a logical step since the ISDN basic rate interface provides two logical phone lines (via two ISDN B channels) that can be used in parallel. With the adoption of VoIP by consumers, consumer VoIP PBXs have appeared, with PBX functions becoming simple additional software features of consumer-grade routers and switches ...

  5. 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 ...

  6. Plain old telephone service - Wikipedia

    en.wikipedia.org/wiki/Plain_old_telephone_service

    Plain Old Telephone Service (POTS), or Plain Ordinary Telephone System, [1] is a retronym for voice-grade telephone service that employs analog signal transmission over copper loops. The term POTS originally stood for Post Office Telephone Service , as early telephone lines in many regions were operated directly by local Post Offices .

  7. 1A2 Key Telephone System - Wikipedia

    en.wikipedia.org/wiki/1A2_Key_Telephone_System

    The phone lines that terminated at the KSU were also terminated at these relays and in the event of a power failure, the relays would de-energize and switch the phone lines to the ringers of selected phones. Buzzers were not usually designed to accommodate the 90-110 volt, 20–30 Hz ringing signal used by telephone ringers.

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