ADTRAN Enhances Carrier Ethernet Capabilities; Technology Assets Acquired from Luminous Networks.

HUNTSVILLE, Ala. -- ADTRAN(R), Inc. (NASDAQ: ADTN), a leading supplier of next-generation network solutions, today announced that the company has enhanced its carrier Ethernet capabilities with the acquisition of all intellectual property and world-wide product rights from Luminous Networks. In addition to integrating the Luminous technologies into existing and future ADTRAN products, the company will continue to manufacture selected Luminous products.

"This is another step in our long-established strategy to aid carriers in the migration to IP access architectures," said Kevin Schneider, chief technology officer, ADTRAN. "The acquisition of these technologies, used globally by service providers to deliver carrier-class Ethernet services, both strengthens and broadens our business service offerings."

"The market for Ethernet-based carrier services is growing at a rapid rate," said Michael Howard, principal analyst, Infonetics Research. "Our research indicates that a majority of service providers have deployed Ethernet collector rings in 2005, and the number is increasing, and many of these are offering Ethernet services over RPR, and more plan to in the near future. The addition of these technologies to ADTRAN's product line is a good move and will allow them to address this growing market with a full portfolio."

About ADTRAN

ADTRAN, Inc. is one of the world's most successful network access equipment suppliers, with an 18-year history of profitability and a portfolio of more than 1,400 solutions for use in the last mile of today's telecommunications networks. Widely deployed by carriers and enterprises alike, ADTRAN solutions enable voice, data, video, and Internet communications across copper, fiber, and wireless network infrastructures. ADTRAN solutions are currently in use by every major U.S. service provider and many global ones, as well as by thousands of public, private and governmental organizations worldwide.

For more information, contact the company at 800 9ADTRAN (800 923-8726) or via email at [e-mail]. On the Web, visit www.adtran.com.