ADTRAN's NetVanta 3000 Series of Access Routers Adds VPN Functionality; New ADTRAN Operating System Enhancements Secure Corporate Connectivity Using IPSec VPN.

Business Editors/High-Tech Writers

NetWorld+Interop 2003 Las Vegas

Booth No. 6469

HUNTSVILLE, Ala.--(BUSINESS WIRE)--April 29, 2003

ADTRAN(TM), Inc. (NASDAQ: ADTN) today announces a new version of the ADTRAN Operating System (OS), version 4.1, that adds Virtual Private Networking (VPN) to the low-cost, access router alternative, the NetVanta(TM) 3000 Series. This new ADTRAN OS upgrade expands market opportunities by allowing businesses of all sizes to secure corporate connectivity using the public Internet with standard-based IPSec protocols and various encryption algorithms like DES, 3DES, and AES. When equipped with the ADTRAN OS upgrade, the NetVanta 3000 Series of access routers interoperates with other IPSec based products including ADTRAN's NetVanta 2000 Series of dedicated VPN/Firewall appliances and the NetVanta VPN software client.

"There are two schools of thought when it comes to implementing Virtual Private Networks," said Tim Saunders, vice president product management, ADTRAN Enterprise Networks Division. "Some users want a dedicated appliance to perform VPN and firewall functions, separate from the access router. Others prefer a single box solution that performs all the functions. Either way, ADTRAN can now satisfy both requirements. The NetVanta 2000 Series is a dedicated VPN/Firewall platform, while the NetVanta 3000 Series is an access device that can terminate the wide area circuit, and perform all routing, firewall, and VPN functions."

The new 4.1 version of the ADTRAN OS introduces an Enhanced Feature Pack, which is an upgrade to the Standard Feature Pack and includes all the VPN functionality described. The NetVanta 3305 equipped with the Enhanced Feature Pack includes a hardware encryption accelerator and acts as an Internet security gateway supporting up to 100 private encrypted communication tunnels. The NetVanta 3200 and 3205 devices loaded with the ADTRAN OS Enhanced Feature Pack support an unlimited number of users and up to five simultaneous private encrypted communication tunnels.

The ADTRAN OS Standard Feature Pack is the default operating system for all the NetVanta 3000 routers and includes standard features such as a stateful inspection firewall to protect the corporate infrastructure, familiar Command Line Interface (CLI) to reduce training, and standards based implementations of Frame Relay, PPP, OSPF, and RIP. It also features NAT/NAPT for IP address concealment and conservation, and DHCP server and client for automatic and flexible IP address assignment. Dual flash memory locations allow two full versions of the ADTRAN OS to coexist on the same device which simplifies adoption of newly released versions.

About NetVanta Routers

The NetVanta 3000 Series is a family of modular access routers designed for cost-effective branch office connectivity via Frame Relay, Point to Point, Internet Access, and now Virtual Private Networking. This modular, full-featured solution supports line rates from 56 Kbps to dual-T1s, at a cost that is up to 55 percent lower than other brand name routers. To date, ADTRAN has announced four NetVanta router models including the single-slot, single Ethernet NetVanta 3200, NetVanta 3205, NetVanta 3205 DC, and the dual-slot, dual Ethernet NetVanta 3305. The Enhanced Feature Pack upgrade is currently shipping and is priced at $495 (U.S. List) for the NetVanta 3200, 3205, and 3205 DC, and $695 (U.S. List) for the NetVanta 3305.

The NetVanta 3000 Series is backed by an industry-leading five-year warranty (for North America), ADTRAN's world-class technical support, and free maintenance updates are available via the ADTRAN web site. For added value, ADTRAN Custom Extended Service (ACES) programs are also available offering software maintenance contracts, guaranteed response times from four-hours to next business day, on-site and remote installation services, maintenance support, and depot sparing.

About ADTRAN

ADTRAN, Inc. is an established provider of advanced transmission products for today's expansive telecommunications networks. ADTRAN products support most major technologies, including internetworking, access routing, fiber, T3, T1, E1, E3, wireless T1/E1, ATM, Frame Relay, IP, VPN, ADSL, SHDSL, SDSL, HDSL, HDSL2, HDSL4, SONET, SDH, ISDN, and DDS. According to Gartner/Dataquest and IDC, ADTRAN has gained the leading market position in enterprise integrated access devices and HDSL, while maintaining its leadership position for the fourth year in a row in T1 and sub rate CSU/DSUs, Frame Relay/DDS extension, and ISDN extension. ADTRAN equipment serves the major Incumbent Local Exchange Carriers, interexchange carriers, ISPs, Competitive Local Exchange Carriers, international service providers, public and private enterprises, and original equipment manufacturers.