HUNTSVILLE, Ala.--(BUSINESS WIRE)--ADTRAN®, Inc., (NASDAQ: ADTN), a leading provider of next-generation networking solutions, today announced more than 100 communities across the U.S. are reaping the benefits of Gigabit broadband as part of ADTRAN’s Enabling Communities, Connecting Lives campaign. United Communications is the most recent ADTRAN customer to outpace the competition and beat larger service providers to Gigabit delivery with deployments in Nolensville, Chapel Hill, and College Grov