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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.
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.
901 Marquette, formerly known as AT&T Tower, is a 464-foot (141 m) tall skyscraper in Minneapolis, located on the corner of Marquette Avenue and 9th Street South.It was completed in 1991 and has 34 floors.
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]
AT&T City Center; AT&T Switching Center; 901 Marquette; ATT Chesterfield; B. Bell Laboratories Building; Bell Labs Holmdel Complex; Bell Telephone Company of ...
Room 641A is a telecommunication interception facility operated by AT&T for the U.S. National Security Agency, as part of its warrantless surveillance program as authorized by the Patriot Act. The facility commenced operations in 2003 and its purpose was publicly revealed by AT&T technician Mark Klein in 2006. [1] [2]
Bell Communications Around the Globe is a 1961 sculptural relief by Anthony Heinsbergen, installed on the west side of an AT&T switching center at 420 South Grand Avenue in Los Angeles, California. [ 1 ] [ 2 ] [ 3 ] According to the Los Angeles Times , the mural depicts the "globe linked by undersea telephone cables and satellite relays that ...
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 ...