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  2. AT&T Switching Center - Wikipedia

    en.wikipedia.org/wiki/AT&T_Switching_Center

    The AT&T Madison Complex Tandem Office is a 17-story, 79 m (259 ft) building in Los Angeles, California, completed in 1961.With its microwave tower, used through 1993, bringing the overall height to 137 m (449 ft), it is the 29th tallest building in Los Angeles.

  3. 811 Tenth Avenue - Wikipedia

    en.wikipedia.org/wiki/811_Tenth_Avenue

    AT&T Switching Center, 2020. 811 Tenth Avenue (also called the AT&T Switching Center) is a 370-foot-tall (110 m) skyscraper in the Hell's Kitchen neighborhood of Manhattan in New York City. [1] It was designed by Kahn & Jacobs and completed in 1964, occupying the full block of 10th Avenue's western side between West 53rd and 54th Streets.

  4. AT&T Huron Road Building - Wikipedia

    en.wikipedia.org/wiki/AT&T_Huron_Road_Building

    The Huron Road building was retained as a telephone switching center for Downtown Cleveland. It was one of the biggest switching stations in the country for years. In 1983, Ohio Bell moved into its current location at 45 Erieview. Today, the Huron Road building has been expanded for DSL service for Cleveland.

  5. 33 Thomas Street - Wikipedia

    en.wikipedia.org/wiki/33_Thomas_Street

    The building was a core part of the AT&T Long Lines Department, housing solid-state switching equipment that required tight security and ample space. The Long Lines Department became AT&T Communications in 1984 after the Bell System divestiture. The AT&T Long Lines Building is now commonly known by its street address, 33 Thomas Street. [4]

  6. Mobile Telephone Switching Office - Wikipedia

    en.wikipedia.org/wiki/Mobile_Telephone_Switching...

    The Mobile Telephone Switching Office (MTSO) is the mobile equivalent of a PSTN Central Office. The MTSO contains the switching equipment or Mobile Switching Center (MSC) for routing mobile phone calls. It also contains the equipment for controlling the cell sites that are connected to the MSC. The systems in the MTSO are the heart of a ...

  7. Franklin Center (Chicago) - Wikipedia

    en.wikipedia.org/wiki/Franklin_Center_(Chicago)

    The Franklin Center is a 60-story supertall skyscraper in the Loop neighborhood of downtown Chicago.Completed in 1989 as the AT&T Corporate Center to consolidate the central region headquarters of the American Telephone & Telegraph Company (AT&T), [2] it stands at a height of 1,007 ft (307 m) and contains 1.7 million sq ft (160,000 m 2) of floor space. [3]

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  9. Ohio Bell - Wikipedia

    en.wikipedia.org/wiki/Ohio_Bell

    The Ohio Bell Telephone Company, now doing business as AT&T Ohio, is the Bell Operating Company serving most of Ohio and parts of West Virginia. It is a wholly owned subsidiary of AT&T . Its headquarters is the Ohio Bell Building at 750 Huron Road, Cleveland , Ohio , and formerly had a secondary headquarters at 150 East Gay Street, Columbus ...