ADTRAN Expands MSPP with the Addition of OC -48 and EFM Bonding

ADTRAN, Inc. (NASDAQ: ADTN), a leading supplier of network access equipment, today announced the addition of OC-48 and Ethernet in the First Mile (EFM) capabilities to its OPTI-6100 Multi-Service Provisioning Platform (MSPP).

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Contact:
Tammie Dodson
ADTRAN, Inc.
256.963.6739
press@adtran.com

ADTRAN Expands MSPP with the Addition of OC -48 and EFM Bonding

New Capabilities Further Enhance Converged Services Solutions

HUNTSVILLE, Ala. - -(June 5, 2006) - -ADTRAN, Inc. (NASDAQ: ADTN), a leading supplier of network access equipment, today announced the addition of OC -48 and Ethernet in the First Mile (EFM) capabilities to its OPTI -6100 Multi -Service Provisioning Platform (MSPP). The OPTI -6100 now provides scalability from OC -3 to OC -48, making it perfectly positioned to address virtually any access or metro ring application. The new system enables delivery of Ethernet, DS1, DS3, and optical services directly from OC -48 rings in the compact OPTI -6100 form factor, thereby minimizing cost and space requirements. The OPTI -6100 offers the flexibility to add additional network bandwidth, upgrade existing optical rings, and support Next Generation Ethernet services.

ADTRAN's addition of EFM to the platform provides carriers with the means to host multiple bonded circuits and aggregate these circuits into a single element, thus eliminating the need for multiple stand -alone pieces of equipment. This increases network efficiency, simplifies network support, leverages existing OPTI -6100 systems, and reduces overall costs for carriers and their customers.

"Next -generation services are driving the demand for higher capacity fiber rings and carriers are looking for cost -effective solutions to meet these needs," said Eric Vallone, director of product management, ADTRAN Carrier Networks Division. "This compact yet powerful platform offers the converged service capability, functionality, and scalability carriers need to address a variety of network topologies while minimizing deployment costs."

About ADTRAN
ADTRAN, Inc. is a leading global provider of networking and communications equipment, 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 info@adtran.com. On the Web, visit www.adtran.com.

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