TeliaSonera International Carrier has announced it is to become the biggest single stakeholder in the TAT-14 Atlantic Seacable submarine system, which is in the process of being upgraded. The Swedish-owned carrier said in a press release that it is increasing its stake by 67% in terms of the committed upgrade volume in the transatlantic dual cable system, which is owned by a consortium including AT&T, KPN, T-Systems and France Telecom amongst others, and has been in operation since 2001. IP traffic demand has prompted a second upgrade of TAT-14 to be carried out by Mitsubishi Electric Corporation, providing an additional 8×10G capacity on the north TAT route and 4×10G on the south stretch. An additional second phase of the upgrade will give TeliaSonera International Carrier an extra 20×10G on each cable. TeliaSonera International Carrier currently has a total of ten separate routes to carry transatlantic traffic. The upgrade project is scheduled to be delivered in two phases, the first by the end of 2011 and the second in the third quarter of 2012.