Nortel Networks Corporation operates in the Telephone and telegraph apparatus sector. Nortel Networks Corporation (Nortel) previously was a global supplier of end-to-end networking products and solutions serving both service providers and enterprise customers. Nortel Networks Limited (NNL) is Nortel's principal direct operating subsidiary. As of December 31, 2010, the Company had sold substantially all of its businesses. Nortel is focused on the sale of its remaining assets, optimizing the value of its intellectual property (IP) portfolio, providing transition services to the purchasers of its businesses, the wind-down of its global operations and other restructuring activities. On December 17, 2010, the Company announced that NNL and NNTC completed the sale of its Ottawa Carling Campus to Public Works and Government Services Canada (PWGSC). On June 29, 2010, it announced that NNL had completed the sale of its 50% plus one share interest in LGN to Ericsson. In July 2011, the Company sold its patents and patent applications to a consortium.