ADTRAN, Inc. designs, develops, and manufactures ADvanced TRANsmission products for high-speed digital communications. Incorporated in 1985, ADTRAN began operations in 1986 following AT&T's divestiture of the Regional Bell Operating Companies (RBOCs) with restrictions that effectively barred their manufacturing of equipment. These events created an opportunity for companies such as ADTRAN to supply network equipment to the seven RBOCs as well as more than 1,300 independent telephone companies in the United States.

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