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  2. AT&T Communications (1984-2010) - Wikipedia

    en.wikipedia.org/wiki/AT&T_Communications_(1984...

    AT&T Long Lines initially began with wire and cable, but as technology progressed, it transitioned to a microwave radio relay network that provided long-distance services for AT&T and its customers. Telephone connections to other countries used this network. By the 1970s, 95% of long-distance and 70% of intercity telephone calls in the United ...

  3. History of AT&T - Wikipedia

    en.wikipedia.org/wiki/History_of_AT&T

    In 1880, the management of American Bell created what would become AT&T Long Lines. The project was the first of its kind to create a nationwide long-distance network with a commercially viable cost-structure. This project was formally incorporated into a separate company named American Telephone and Telegraph Company on March 3, 1885.

  4. Long line (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Long_line_(telecommunications)

    Long line (telecommunications) In telecommunication, a long line is a transmission line in a long-distance communications network such as carrier systems, microwave radio relay links, geosynchronous satellite links, underground cables, aerial cables and open wire, and Submarine communications cables. In the United States, some of this ...

  5. Breakup of the Bell System - Wikipedia

    en.wikipedia.org/wiki/Breakup_of_the_Bell_System

    [citation needed] Bedminster, New Jersey, is home to the AT&T Global Network Operations Center and is the headquarters of AT&T Corp., the long-distance subsidiary of AT&T Inc. The new AT&T Inc. lacks the vertical integration that characterized the historic AT&T Corporation and led to the Department of Justice antitrust suit.

  6. AT&T Communications - Wikipedia

    en.wikipedia.org/wiki/AT&T_Communications

    AT&T Cybersecurity. Website. www .att .com. AT&T Communications is a division of AT&T that focuses on mobile phone, broadband, fixed line telephone, home security, network security, and business services. The division houses AT&T Mobility, AT&T Internet, AT&T Phone, AT&T Long Distance, AT&T Labs, AT&T Digital Life, and AT&T Cybersecurity .

  7. L-carrier - Wikipedia

    en.wikipedia.org/wiki/L-carrier

    L-carrier. The L-carrier system was one of a series of carrier systems developed by AT&T for high-capacity transmission for long-distance communications. Over a period from the late 1930s to the 1970s, the system evolved in six significant phases of development, designated by Bell System engineers as L-1 through L-5, and L-5E.

  8. No. 4 Electronic Switching System - Wikipedia

    en.wikipedia.org/wiki/No._4_Electronic_Switching...

    The No. 4 Electronic Switching System ( 4ESS) is a class 4 telephone electronic switching system that was the first digital electronic toll switch introduced by Western Electric for long-distance switching. It was introduced in Chicago in January 1976, to replace the 4A crossbar switch. [1] The last of the 145 systems in the AT&T network was ...

  9. Long-distance calling - Wikipedia

    en.wikipedia.org/wiki/Long-distance_calling

    In telecommunications, a long-distance call (U.S.) or trunk call (also known as a toll call in the U.K. [citation needed]) is a telephone call made to a location outside a defined local calling area. Long-distance calls are typically charged a higher billing rate than local calls. The term is not necessarily synonymous with placing calls to ...

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