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From Wikipedia, the free encyclopedia
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Unity is a Trans-Pacific submarine communications cable between Japan and the United States that was completed in April 2010.[1][2][3]

Unity comprises a 10,000 km linear cable system with a "multi-terabit" capacity of up to 7.68 Tbit/s.[4] Construction of the cable was funded by a consortium formed in February 2008 comprising Bharti Airtel, Global Transit, Google, KDDI Corporation, Pacnet and SingTel.[4] Unity's installation cost around US$300 million, and its completion increased Trans-Pacific cable capacity by around 20 per cent.[2]

History[edit]

The CS Tyco Responder, a cable-laying ship which was used to install the Unity underwater communications cables

In February 2008 a consortium comprising Bharti Airtel, Global Transit, Google, KDDI Corporation, Pacnet and SingTel announced that they had executed agreements to build a high-bandwidth subsea fiber optic cable linking the United States and Japan, with an estimated construction cost of US$300 million.[2]

A signing ceremony was held in Tokyo on February 23, 2008 at which the Unity consortium contracted NEC Corporation and Tyco Telecommunications to construct and install the system. NEC and Tyco began work on the project in June 2008.[5] The cable reached Japan in November 2009.[6] Testing of the cable was completed, and it became ready for service, in April 2010.[7][8]

Specifications[edit]

Unity is a 10,000 kilometer Trans-Pacific cable between Chikura, located off the coast near Tokyo, and Los Angeles and other network points of presence on the West Cost of the United States. At Chikura, Unity is connected to other cable systems.

The new five fiber pair cable system has five fiber pairs, with each fiber pair capable of carrying up to 960 gigabits per second (Gbit/s). By having a high fiber count, Unity is able to offer more capacity at lower unit costs.

Unity is expected to initially increase Trans-Pacific lit cable capacity by about 20 percent, with the potential to add up to 7.68 terabits per second (Tbit/s) of bandwidth across the Pacific.

Media response[edit]

Writing in The New York Times in September 2007, Saul Hansell said of Google's anticipated involvement in Unity that:

"Google may be the ultimate do-it-yourself company. From the start, Google's sense of its own engineering superiority, combined with a tightwad sensibility, led it to build its own servers. It writes its own operating systems. It is now threatening to buy wireless carrier spectrum and it is getting ready to hire ships that will lay a data communications cable across the Pacific..."[9]

References[edit]

  1. ^ "Google will help build trans-Pacific fiber-optic cable". USA Today. 26 February 2008. Retrieved 1 January 2012. 
  2. ^ a b c "Google part of group building cable to Japan". The Washington Post. 26 February 2008. Retrieved 1 January 2012. 
  3. ^ "Google, SingTel, others to build submarine cable". Reuters. 26 February 2008. Retrieved 1 January 2012. 
  4. ^ a b Grahame Lynch "Google plans new undersea "Unity" cable across Pacific." CommsDay.com. September 21, 2007. Retrieved on September 21, 2007.
  5. ^ "Work Begins on Google-backed 'Unity' Undersea Cable". PC World. 24 June 2008. Retrieved 1 January 2012. 
  6. ^ "Google-backed Unity Cable Lands in Japan". PC World. 3 November 2009. Retrieved 1 January 2012. 
  7. ^ "Unity cable set for service". The Star. 2 April 2010. Retrieved 1 January 2012. 
  8. ^ "Bharti launches $300 m Unity cable system". The Hindu. 1 April 2010. Retrieved 1 January 2012. 
  9. ^ "Has Google Plans to Lay a Pacific Cable?". The New York Times. 21 September 2007. Retrieved 2 January 2012. 
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