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  2. Public switched telephone network - Wikipedia

    en.wikipedia.org/wiki/Public_switched_telephone...

    The public switched telephone network (PSTN) is the aggregate of the world's telephone networks that are operated by national, regional, or local telephony operators. It provides infrastructure and services for public telephony .

  3. Dial-up Internet access - Wikipedia

    en.wikipedia.org/wiki/Dial-up_Internet_access

    Dial-up Internet access is a form of Internet access that uses the facilities of the public switched telephone network (PSTN) to establish a connection to an Internet service provider (ISP) by dialing a telephone number on a conventional telephone line which could be connected using an RJ-11 connector. [1]

  4. Public data network - Wikipedia

    en.wikipedia.org/wiki/Public_data_network

    A public switched data network (PSDN) is a network for providing data services via a system of multiple wide area networks, similar in concept to the public switched telephone network (PSTN). [3] A PSDN may use a variety of switching technologies, including packet switching , circuit switching , and message switching . [ 3 ]

  5. PSTN network topology - Wikipedia

    en.wikipedia.org/wiki/PSTN_network_topology

    PSTN network topology is the switching network topology of a telephone network connected to the public switched telephone network (PSTN).. In the United States and Canada, the Bell System network topology was the switching system hierarchy implemented and operated from c. 1930 to the 1980s for the purpose of integrating the diverse array of local telephone companies and telephone numbering ...

  6. Telecommunications network - Wikipedia

    en.wikipedia.org/wiki/Telecommunications_network

    Examples of telecommunications networks include computer networks, the Internet, the public switched telephone network (PSTN), the global Telex network, the aeronautical ACARS network, [1] and the wireless radio networks of cell phone telecommunication providers.

  7. Voice over IP - Wikipedia

    en.wikipedia.org/wiki/Voice_over_IP

    The VoIP E911 emergency-calling system associates a physical address with the calling party's telephone number. All VoIP providers that provide access to the public switched telephone network are required to implement E911, a service for which the subscriber may be charged. "VoIP providers may not allow customers to opt-out of 911 service."

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