ADTRAN, Inc. designs, manufactures and markets solutions and provides services and support for communications networks. The Company�s solutions are deployed by providers of communications services (serviced by its Carrier Networks Division), and small and mid-sized enterprises (SMEs) (serviced by its Enterprise Networks Division), and enable voice, data, video and Internet communications across wireline and wireless networks. The Company operates in two segments: the Carrier Networks Division and the Enterprise Networks Division. During the year ended December 31, 2011, sales of Carrier Networks products accounted for 79.4% of total revenue, while sales of Enterprise Networks products accounted for 20.6%. On August 4, 2011, the Company acquired Bluesocket, Inc. In May 2012, the Company announced the completion of its acquisition of the Nokia Siemens Networks Fixed Line Broadband Access Business.