ADTRAN

2 ® Adtran, Inc All rights reserved The Company  Strong Stable –Strong Balance Sheet –Over 20 year history of continuous profitability –Global Presence > 50 Countries The Products  Innovative –All-in-one space and cost-saving solutions with integrated functionality  Carrier Class Reliability –Multi-service platforms leverage new service deployments The Support  Exceptional, Customer Oriented –“Above and Beyond” core company value –Employees empowered to “problem solve Why ADTRAN?

3 ® Adtran, Inc All rights reserved Who is ADTRAN?  Leading provider of innovative networking and communications equipment –ADTRAN solutions enable converged voice, data, video, and Internet services –Broad customer base with solutions widely deployed by carriers and businesses of all sizes, worldwide ADTRAN Headquarters, Huntsville, AL  Smart, reliable solutions for today’s communications networks –25 years of experience building innovative solutions supporting next generation technologies –Continued market leadership in key technologies from integrated access, DSL, and VoIP to routing  Dependable solutions for business and residential connectivity –Entrepreneurial engineering capabilities –Demonstrated financial competence

4 ® Adtran, Inc All rights reserved Industry Acknowledgement  Forbes “Top 200 Best Small Companies”  Fortune “40 Stocks to Retire On”  Featured in “The Breakthrough Company”  National Media Participation –Cover story for NGN Magazine –Wall Street Journal –Fortune –Business Week

5 ® Adtran, Inc All rights reserved 1986 FOUNDED with D4 card opportunity for large installed base 1987 Signed first customer contract with a Regional Bell Operating Company 1989 Had first million dollar month 1992 Introduces first HDSL product family 1997 Becomes market leader in DSU/CSUs 1995 Stock hits $65/share; announced 2 for split; ships HDSL to the global market 1994 ADTN becomes publicly traded on NASDAQ, expands with 200,000 sq. ft. addition ADTRAN History 2004 Founder Mark Smith retires; Tom Stanton becomes CEO 2003 Ranked by Forbes as one of the “Best Places to do Business” 2007 Top 8 US wireline carriers select TA5000. Market Leadership in BB, MBH and CE 2000 Becomes market leader in HDSL, ISDN, DDS, TDM IADs, CSU /DSU; East Tower built 1999 Forms Carrier and Enterprise Networks Divisions ADTN named one of the “200 Best Small Companies” by Forbes 2010 Record Revenue in all growth product areas, contributing over 50% of revenue

6 ® Adtran, Inc All rights reserved Carrier Networks Division  Improve service provider access infrastructure  Increase services for business & residential customers –Broadband –Optical access –Carrier Ethernet –IPTV –VoIP –Mobile Backhaul Central Office Business & Residential Customers Provider’s Access Infrastructure

7 ® Adtran, Inc All rights reserved  Value-based communication solutions for SME  Converged Access Solutions –IPBG, IADs, Routers, GPON  Unified Business Solutions –Unified Communications, appliance PBX, Phones, Switches, WAPs  ADTRAN solutions enable: –IP Telephony/VoIP –Unified Communications –Branch Office Connectivity –LAN Switching –Internet Access –Wireless Access Increase Services for Business Customers Enterprise Networks Division

8 ® Adtran, Inc All rights reserved EN Internetworking Product Portfolio VoIP-enabled Performance Routers IP Business Gateways (IPBGs) Integrated Access Devices (IADs) Gigabit Passive Optical Networking (GPON) Network Management Unified Communications Premises-based IP PBX IP Phones LAN Switches Wireless Access Points (WAPs) Network Management Converged Access SolutionsUnified Business Solutions

9 ® Adtran, Inc All rights reserved  Customer priority mentality –“Above and Beyond” core company value –Reputation established on premiere support –Employees empowered to “problem solve” Above and Beyond Support  Pre- & Post-sales technical support –U.S.-based knowledgeable and dedicated staff –Engineering focus  Product updates without service contracts  Industry renown warranties –5-year, 10-year and Lifetime

10 ® Adtran, Inc All rights reserved Professional Services ACES – ADTRAN Custom Extended Services A nationwide, comprehensive and flexible installation and maintenance service program designed to protect the network  Install and maintain full line of enterprise solutions –Quick delivery to market New or complex technologies  Flexibility –Custom solutions to ‘fill the gap’  Ensures customer satisfaction –Professional deployment –Support down the road Priority TAC access Advanced replacements On-Site technicians Move, Add, Change support Support for future growth

11 ® Adtran, Inc All rights reserved ADTRAN - The Right Choice  Strong, Stable Company  Innovative, Carrier Class Products  Outstanding Support

12 ® Adtran, Inc All rights reserved