ADTRAN, Inc. designs, manufactures, markets, services, and supports communications network solutions that enable voice, data, video, and Internet communications across various network infrastructures in the United States and internationally. Its Carrier Networks division provides fiber and copper-based solutions used by service providers to deliver voice, data, and video services to their customers' premises and mobile network cell sites. Its products enable services, such as voice, VoIP, Internet protocol (IP) television, RF video, high speed Internet access, mobile broadband, and data services based upon Ethernet, frame relay, time division multiplexed, and asynchronous transfer mode networks, connecting the network with user components, such as switches, routers, gateways, integrated access devices, PBXs, wireless LAN products, and telephone key systems. It serves local exchange carriers, independent operating companies, competitive local exchange carriers, utilities, municipalities, cable MSOs, international carriers, and wireless service providers. The company's Enterprise Networks division provides internetworking products, including IP business gateways, optical network terminals, wireless LAN products, multi-service routers, managed Ethernet switches, unified communications solutions, carrier Ethernet network terminating equipment, network management solutions, and integrated access devices. This division serves service providers, independent telephone companies, and competitive service providers, as well as retail, food service, healthcare, finance, government, education, manufacturing, military, transportation, hospitality, and energy/utility markets. The company also offers loop access products, such as high bit-rate digital subscriber line, digital data service, integrated services digital network, T1/E1/T3 channel service units/data service units, and fixed-wireless products. ADTRAN, Inc. was founded in 1985 and is headquartered in Huntsville, Alabama.