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TAT-6

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Original synthesis to sit alongside the encyclopedia article below. Not part of Wikipedia; verify facts on Wikipedia when precision matters.

TAT-6, short for Transatlantic Telephone Cable 6, is an undersea communications cable system part of the transatlantic TAT cable series, designed to carry telephone and data traffic between North America and Western Europe. It was a coaxial-based cable, an upgrade over earlier TAT models with higher transmission capacity.

Key moments

  • 1976Laid between France and the United States, with a total length of approximately 6,300 km
  • 1976Entered commercial service, supporting up to 4,200 simultaneous telephone circuits with 693 line amplifiers spaced every 9 km
  • Late 1990s to early 2000sDecommissioned as newer fiber-optic transatlantic cables replaced its transmission capacity

Historical and Technical Significance

TAT-6 represented a mid-generation upgrade for transatlantic communications, following earlier coaxial TAT cables like TAT-1 through TAT-5. Unlike the first-generation TAT cables with smaller circuit counts, its 4,200-circuit capacity significantly boosted cross-Atlantic voice and early data transmission. It was also one of the last major coaxial transatlantic cables, as subsequent TAT systems starting with TAT-8 adopted fiber-optic technology which offered far higher bandwidth.

Role in Global Communications

For over two decades, TAT-6 was a critical infrastructure link for international telecommunications, supporting business calls, media transmission, and early cross-border data exchanges between North America and Europe. Its deployment helped standardize transatlantic communication standards and laid groundwork for the global digital communications network that followed.

TAT-6 was the sixth transatlantic telephone cable. It was in operation from 1976 to 1994, with a bandwidth of 12 MHz (4,000 telephone circuits) between Green Hill (United States) and Saint-Hilaire-de-Riez, Vendée, (France).[1][2]

Known as the SG coaxial cable system, designed by Bell Labs, the cable is 3396 nmi with repeater spacing of 5.1 nmi. The deep sea portion, some 3000 nmi in length, was laid by the Cable Ship Long Lines, owned by AT&T. Portions of the shore sections were laid by the French Cable Ship Vercors.

The SG Undersea Cable System was designed by Bell Laboratories at their Allentown, PA, Greensboro, NC, Holmdel, NJ, and Whippany, NJ facilities.[3]

A few years later, TAT-7 was put into service between Tuckerton, New Jersey, and Lands End, England, and was the last analog Transatlantic undersea system.

The following system, TAT-8, was implemented by AT&T Corp. (with Bell Laboratories), STC (with British Telecom), and Alcatel (with France Telecom). This was the first Transatlantic fiber-optic system, had greatly increased capacity and performance.

References

  1. 1990 World's Submarine Telephone Cable Systems U.S. Department of Commerce, 1990^
  2. History of the Atlantic Cable & Submarine Telegraphy - Cable Timeline atlantic-cable.com, retrieved 2018-08-05^
  3. The Bell System Technical Journal, Volume 57, Number 7, Part 1, September 1978^