ADTRAN, Inc. manufactures and sells networking and communications equipment worldwide. It operates in two divisions, Carrier Networks and Enterprise Networks. The Carrier Networks division provides broadband access products, such as multi-service access nodes, fiber to the nodes, digital subscriber line access multiplexer products, and distribution point units; optical products, including optical networking edge, fiber Ethernet access devices, multi-service edge switches, multi-service provisioning platforms, and pluggable optical products; and time division multiplexed (TDM) systems under the Total Access and hiX brand names. This division serves local exchange carriers, public telephone and telegraphs companies, cable multi-service operators, independent operating companies, utilities, municipalities, and wireless service providers. The Enterprise Networks division provides internetworking products, such as Internet protocol business gateways, optical network terminals, virtual wireless LAN products, access routers, enterprise session border controllers, managed Ethernet switches, unified communications solutions, carrier Ethernet network terminating equipment, Ethernet routers and gateways, and network management solutions. This division serves service providers, cable multi-service operators, and independent communications companies, 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, including 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.