Telecommunications companies dial up Dycom Industries to string wire, bury cable or erect towers to extend their networks. Operating through a nationwide network of more than 40 subsidiaries, Dycom designs, builds, and maintains coaxial, copper, and fiber-optic cable systems as well as wireless infrastructure for phone companies and cable television operators. Dycom also provides wiring services for businesses and government agencies, installs and maintains electrical lines for electric and gas utilities, and locates underground wires and pipelines for excavators. Dycom operates throughout the United States. Most of the company's revenue comes from major telecommunications companies.