Transatlantic communications cable explained

A transatlantic telecommunications cable is a submarine communications cable connecting one side of the Atlantic Ocean to the other. In the 19th and early 20th centuries, each cable was a single wire. After mid-century, coaxial cable came into use, with amplifiers. Late in the 20th century, all cables installed use optical fiber as well as optical amplifiers, because distances range thousands of kilometers.

History

When the first transatlantic telegraph cable was laid in 1858 by Cyrus West Field, it operated for only three weeks; a subsequent attempt in 1866 was more successful. On July 13, 1866 the cable laying ship Great Eastern sailed out of Valentia Island, Ireland and on July 27 landed at Heart's Content in Newfoundland, completing the first lasting connection across the Atlantic. It was active until 1965.[1]

Although a telephone cable was discussed starting in the 1920s,[2] to be practical it needed a number of technological advances which did not arrive until the 1940s. Starting in 1927, transatlantic telephone service was radio-based.[3]

TAT-1 (Transatlantic No. 1) was the first transatlantic telephone cable system. It was laid between Gallanach Bay, near Oban, and Clarenville, Newfoundland between 1955 and 1956 by the cable ship Monarch.[4] It was inaugurated on September 25, 1956, initially carrying 36 telephone channels. In the first 24 hours of public service, there were 588 London–U.S. calls and 119 from London to Canada. The capacity of the cable was soon increased to 48 channels. Later, an additional three channels were added by use of C Carrier equipment. Time-assignment speech interpolation (TASI) was implemented on the TAT-1 cable in June 1960 and effectively increased the cable's capacity from 37 (out of 51 available channels) to 72 speech circuits. TAT-1 was finally retired in 1978. Later coaxial cables, installed through the 1970s, used transistors and had higher bandwidth. The Moscow–Washington hotline was initially connected through this system.

Current technology

All cables presently in service use fiber optic technology. Many cables terminate in Newfoundland and Ireland, which lie on the great circle route from London, UK to New York City, US.

There has been a succession of newer transatlantic cable systems. All recent systems have used fiber optic transmission, and a self-healing ring topology. Late in the 20th century, communications satellites lost most of their North Atlantic telephone traffic to these low-cost, high-capacity, low-latency cables. This advantage only increases over time, as tighter cables provide higher bandwidth – the 2012 generation of cables drop the transatlantic latency to under 60 milliseconds, according to Hibernia Atlantic, deploying such a cable that year.[5] [6]

Some new cables are being announced on the South Atlantic: SACS (South Atlantic Cable System)[7] and SAex (South Atlantic Express).[8]

TAT cable routes

The TAT series of cables constitute a large percentage of all North Atlantic cables. All TAT cables are joint ventures between a number of telecommunications companies, e.g. British Telecom. CANTAT cables terminate in Canada rather than in the US.

NameIn serviceTypeInitial channelsFinal channelsWestern endEastern end
TAT-11956–1978Galvanic3651NewfoundlandScotland
TAT-21959–1982Galvanic4872NewfoundlandFrance
TAT-31963–1986Galvanic138276New JerseyEngland
TAT-41965–1987Galvanic138345New JerseyFrance
TAT-51970–1993Galvanic8452,112Rhode IslandSpain
TAT-61976–1994Galvanic4,00010,000Rhode IslandFrance
TAT-71978–1994Galvanic4,00010,500New JerseyEngland
TAT-81988–2002Fiber-optic40,000New JerseyEngland, France
TAT-91992–2004Fiber-optic80,000New Jersey, Nova ScotiaSpain, France, England
TAT-101992–2003Fiber-optic2 × 565 Mbit/sUSGermany, Netherlands
TAT-111993–2003Fiber-optic2 × 565 Mbit/sNew JerseyFrance
TAT-12/131996–2008Fiber-optic12 × 2.5 Gbit/sUS × 2England, France
TAT-142001–2020Fiber-optic3.2 Tbit/sNew Jersey × 2England, France, Netherlands, Germany, Denmark
CANTAT-11961–1986Galvanic80NewfoundlandScotland
CANTAT-21974–1992Galvanic1,840Nova ScotiaEngland
CANTAT-31994–2010Fiber-optic2 × 2.5 Gbit/sNova ScotiaIceland, Faroe Islands, England, Denmark, Germany
PTAT-11989–2004Fiber-optic3 × 140 Mbit/s?New Jersey & BermudaIreland & England

Private cable routes

There are a number of private non-TAT cables.

Cable nameReady for serviceCable length (km)Nominal capacityLatency (ms)Landing pointsOwner
Gemini (decommissioned)May 1998under 100 msnorth: Charlestown, US-RI; Oxwich Bay, GB-WLS; south: Manasquan, US-NJ; Porthcurno, GB-ENGVodafone (originally Cable & Wireless)
AC-1May 199814,301 km120 Gbit/s65 msBrookhaven, US-NY; Whitesands Bay, GB-ENG; Beverwijk, NL-NH; Sylt, DE-SHLumen Technologies (originally Global Crossing)
Columbus IIIDecember 19999,833 kmHollywood, US-FL; Ponta Delgada (Azores), PT; Carcavelos, PT; Conil de la Frontera, ES-AN; Mazara del Vallo (Sicily), ITvarious telecom operators
Yellow/AC-2September 20007,001 km640 Gbit/sunder 100 msBellport, US-NY; Bude, GB-ENGLumen Technologies
Hibernia AtlanticApril 200112,200 km320 Gbit/s, upgraded to 10.16 Tbit/s[9] 59 msLynn, US-MA; Herring Cove, CA-NS; Dublin, IE-L; Southport, GB-ENG; Coleraine, GB-NIRGTT Communications, Inc. (originally Hibernia Networks)
FLAG AtlanticJune 200114,500 kmunder 100 msIsland Park, US-NY; Plerin, FR-BRE; Skewjack, GB-ENG; Northport, US-NYGlobal Cloud Xchange (Reliance Communications)
Tata TGN-AtlanticJune 200113,000 km5.1 Tbit/sunder 100 msWall Township, US-NJ; Highbridge, GB-ENGSold by Tyco to Tata Communications in 2005
ApolloFebruary 200313,000 km3.2 Tbit/sunder 100 msManasquan, New Jersey, US-NJ; Lannion, FR-BRE; Bude, GB-ENG; Shirley, US-NYVodafone (originally Cable & Wireless)[10]
Greenland ConnectMarch 20094,780 kmMilton, CA-NL; Aasiaat, GL-QA; Sisimiut, GL-QE; Maniitsoq, GL-QE; Nuuk, GL-SM; Qaqortoq, GL-KU; Landeyjar, ISTELE Greenland
Hibernia ExpressSeptember 20154,600 kmHalifax, CA-NS; Cork, IE-M; Brean, GB-ENGGTT Communications, Inc. (originally Hibernia Networks)
AEConnect (AEC-1)January 20165,522 km4 × 10 Tbit/s (four strand 100 × 100 Gbit/s)54 msShirley, US-NY; Killala, IE-CAqua Comms
MAREAFebruary 20186,600 km160 Tbit/sVirginia Beach, US-VA; Bilbao, ES-PVFacebook (25 %), Microsoft (25 %), Telefónica (50 %)
MidgardsormenQ2 2019 (planned)7,848 kmVirginia Beach, US-VA; Blaabjerg, DK; Mo i Rana, NOMidgardsormen
DunantSeptember 2020 (live)6,400km250 Tbit/sVirginia Beach, US-VA; Saint-Hilaire-de-Riez, FRGoogle[11] [12]
Havfrue, including America Europe Connect-2 (AEC-2) branchDecember 20207,851km108 Tbit/sAquaCommms, Bulk Infrastructure, Facebook and Google[13]
Grace HopperSeptember 20226,000km352 Tbit/sNew York, US; Bude, UK; Bilbao, SpainGoogle[14] [15]
AmitiéJuly 20236,600km320 Tbit/sLynn, Massachusetts, US; Bude, UK; Le Porge, FranceA consortium comprising Facebook, Microsoft, Aqua Comms, Vodafone (through Cable & Wireless Americas Systems), Orange[16]

South Atlantic cable routes

Cable name Ready for service Length Landing points Owner
February 2000 8,500 km various telecom operators
Q2 2021 5,900 km Telebras, IslaLink
Q3 2018 6,165 km Angola Cables
Q4 2018 5,900 km Camtel, China Unicom

See also

External links

Notes and References

  1. Guarnieri. M.. The Conquest of the Atlantic . IEEE Industrial Electronics Magazine. March 2014 . 8 . 1 . 53–55/67. 10.1109/MIE.2014.2299492.
  2. Web site: Elmore . Bart . January 2017: From the Transatlantic Telephone to the iPhone . Origins . Ohio State University . 28 May 2021.
  3. http://alcatel-lucent.com/bstj/vol14-1935/articles/bstj14-3-489.pdf Short-Wave System for Transatlantic Telephony, by Polkinghorn and Schlaack
  4. https://books.google.com/books?id=nNwDAAAAMBAJ&pg=PA115 "Being First Telephone Cable to Connect Hemispheres"
  5. Web site: Building Networks for High-Speed Stock Trading - WSJ.com . Online.wsj.com . October 9, 2011 . September 18, 2013.
  6. News: The $300m cable that will save traders milliseconds . https://web.archive.org/web/20110911194258/http://www.telegraph.co.uk/finance/newsbysector/mediatechnologyandtelecoms/8753784/The-300m-cable-that-will-save-traders-milliseconds.html . dead . September 11, 2011 . The Daily Telegraph . London . September 11, 2011 . September 18, 2013.
  7. Web site: Angola Cables to build the world's first submarine cable across the South Atlantic: Press Releases - NEC.
  8. Web site: 16Tbit/s SAEx cable deal signed.
  9. Web site: Hibernia Offers Cross-Atlantic 40G. Light Reading. August 13, 2009.
  10. Web site: Submarine Cable Actions Taken PN. FCC. October 4, 2012.
  11. Web site: How Google is building its huge subsea cable infrastructure. Sawers. Paul. April 24, 2019. VentureBeat. https://web.archive.org/web/20190425163121/https://venturebeat.com/2019/04/24/how-google-is-building-its-huge-subsea-cable-infrastructure/. April 25, 2019. live. April 26, 2019.
  12. Web site: Google's Dunant trans-Atlantic cable will deliver record-breaking capacity w/ first use of SDM tech. Li. Abner. April 5, 2019. 9to5Google. https://web.archive.org/web/20190425163227/https://9to5google.com/2019/04/05/google-dunant-undersea-fiber-cable/. April 25, 2019. live. April 25, 2019.
  13. Web site: Aqua Comms plans Havfrue, transatlantic cable network funded by Facebook, Google. Data Center Dynamics. January 16, 2018. Tanwen Dawn-Hiscox.
  14. Web site: Announcing the Grace Hopper subsea cable, linking the U.S., U.K. and Spain. Koley . Vikash. July 28, 2020. Google Cloud.
  15. Web site: Google is building a new private subsea cable between Europe and the US. Lardinois. Frederick. July 28, 2020. TechCrunch.
  16. Web site: Orange landing the transatlantic Amitié cable. TotalTele. 8 February 2021.