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The first TD-2 link between New York and Chicago opened on 1 September 1950, followed by a Los Angeles-San Francisco link on 1 September. The two coasts were linked in 1951. Equipment improvements in 1953 increased capacity to 600 calls per channel.
The first system, dubbed TDX and built by AT&T, connected New York and Boston in 1947 with a series of eight radio relay stations. [1] Through the 1950s, they deployed a network of a slightly improved version across the U.S., known as TD2. These included long daisy-chained links that traversed mountain ranges and spanned continents.
TD2 or TD-2 may also refer to: Taepodong-2, North Korean space launcher technology; TD-2 RNA motif, a conserved RNA structure and metagenome sequences;
These sites were part of the initial White Alice system and connected Aircraft Control and Warning (AC&W) sites with central command and control facilities. The Boswell Bay to Neklasson Lake link was both the first and last operational link in the White Alice system, serving from 1956 to 1985.
The first test connection was made along the initial six stations on February 14, 1955. The line was declared fully operational end-to-end on December 31, 1956. The total cost came to $24,590,000 (equivalent to $270,146,084 in 2023), significantly less than the original relay system. [18] It was the first operational troposcatter system in the ...
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The T-carrier is a hardware specification for carrying multiple time-division multiplexed (TDM) telecommunications channels over a single four-wire transmission circuit. It was developed by AT&T at Bell Laboratories ca. 1957 and first employed by 1962 for long-haul pulse-code modulation (PCM) digital voice transmission with the D1 channel bank.
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