Corporate Headquarters – Huntsville, Al

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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

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Smart Solutions for SMEs andDistributed Enterprises

Routers– Fixed Port

– Modular

– Multiservice - routers withintegrated 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

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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

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Internetworking19%

Broadband Access23%

Optical Access13%HDSL

28%

Other17%

Strategic Areas of Focus

Q4 2009 Revenue

Growth Products made up 55% of Q4 2009 Revenue

Growth Products Grew At 41% QoQ

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Revenue ($ millions)

Revenue: 2006 – 2009 Revenue by Quarter - 2009

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Earnings Per Share

EPS: 2006 – 2009 EPS by Quarter – 2009

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Net Cash & Marketable Securities

Quarterly DividendsStock Repurchases

Net Cash & Marketable Securities

($ millions)

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More Than Just Products

Benefits ADTRAN brings– No Maintenance Fees– No Software Upgrade Fees– No Tech Support Fees– 5 - 10 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