The TAT-14 is a 15,428 km transatlantic submarine cable system, connecting the United States to the United Kingdom, France, the Netherlands, Germany, and Denmark. The TAT-14 cable system was ready for service on March 21, 2001.

The TAT-14 consortium comprises 11 carriers, namely, AT&T, BT, C&W, Deutsche Telekom, France Telecom, KPN, MCII, PGE, Sprint, Swisscom and Telia.

The TAT-14 cable lands at:

• Manasquan, NJ, USA,
• Tuckerton, NJ, USA,
• Widemouth, the United Kingdom,
• St Valery-en-Caux, France,
• Katwijk,  the Netherlands,
• Norden, Germany, and
• Blaabjerg, Denmark

The TAT-14 cable system consists of four fiber pairs, each initially operating with 40 x 10 Gbps DWDM.

Designed with a partial SDH ring protection network structure, the TAT-14 cable system has a initial system capacity of 1.87Tbs calculated as: 
Southern route: 41 x 10Gbs channels + 640 Gbs SDH capacity 
Northern route: 18 x 10Gbs channels + 640 Gbs SDH capacity 
Total = 1.87 Tbs

Now, TAT-14 has a total design capacity of 9.38Tbps upon upgrade with new technology.

In September 1998, KDD Submarine Cable Systems Inc.(KDD-SCS) was awarded the Supply Contract f as the sole supplier for the TAT-14 Cable Network. The Contract Value was approximately US$1.2 billion (Approximately 170 billion yen). KDD-SCS' subcontractors for the TAT-14 cable project included Mitsubishi Electric Corp., TOSHIBA CORP., Ocean Cable Co., Ltd, etc. At that time, KDD-SCS won contracts for large-scale cable systems in the Pacific and Atlantic Oceans, including PC-1, JAPAN-US Cable Network, and TAT-14 Cable Network, with a total contract value of approximately 300 billion yen. As a result, KDD-SCS toasted to be the top of the world, superseding its antecessors, ALCATEL Submarine Networks (France) and TYCO Submarine Systems (U.S.A.), in terms of contract amount as well as technology.

In May 2011, Mitsubishi Electric signed a contract to upgrade the TAT-14 Cable Network with 40Gbps DWDM technology.