Corporate Headquarters – Huntsville, Al

2 ® Adtran, Inc All rights reserved Market Differentiators - Taking the Next Step in Broadband  Market Leadership –Clear leader in FTTN / OSP Products –Over 10M VoIP ports deployed –Comprehensive Suite of products focused on the Access Network  Leveraging Ethernet –Native IP / Ethernet architectures –All Access Platforms Ethernet-based  Common software and feature-set –Native support of Advanced Services  Engineering Focus –Innovators in FGPA development –Custom developments for focus customers –CTO and Staff Engineers driving standards and product adherence  Thought Leadership in Regulatory and Public Policy Arena

3 ® Adtran, Inc All rights reserved Smart Solutions for SMEs and Distributed Enterprises  Routers –Fixed Port –Modular –Multiservice - routers with integrated switches –Wi-Fi  Switches –Layer 2 Fast Ethernet –Layer 3 Fast Ethernet –Gigabit Ethernet –Power over Ethernet (PoE) –Integrated Switch-Routers with PoE  UC/IP Telephony/VoIP –IP PBX –IP Phones  Security and Firewall/VPN  IP Business Gateways –SIP Gateways for Hosted VoIP

4 ® Adtran, Inc All rights reserved About ADTRAN  Market Leadership –#1 Supplier of High-Bit-Rate DSL (HDSL) Equipment –#2 DSL Equipment Supplier in North America –#1 Supplier of Fiber-To-The-Node Sealed Outside Plant DSLAMs –#2 Routers –#2 Ethernet Switches –#2 IP Business Gateways

5 ® Adtran, Inc All rights reserved Strategic Areas of Focus Q Revenue Growth Products made up 55% of Q Revenue Growth Products Grew At 41% QoQ

6 ® Adtran, Inc All rights reserved Revenue ($ millions) Revenue: 2006 – 2009 Revenue by Quarter

7 ® Adtran, Inc All rights reserved Earnings Per Share EPS: 2006 – 2009 EPS by Quarter – 2009

8 ® Adtran, Inc All rights reserved Net Cash & Marketable Securities Quarterly Dividends Stock Repurchases Net Cash & Marketable Securities ($ millions)

9 ® Adtran, Inc All rights reserved More Than Just Products  Benefits ADTRAN brings –No Maintenance Fees –No Software Upgrade Fees –No Tech Support Fees – year warranty –Total Access EMS manages complete suite of ADTRAN products  Large but agile –Quick turns on new product development –Engineering teams are involved with customer requirements  Focused team –Long term partnership –Team is committed to Customer success