HERNDON, Virginia and SUNNYVALE, California, October 1 /PRNewswire/ --

- Spirent SR5500 Test Solution Contributes to Successful Rollout of WiMAX Services in North America

WiMAX World 2008 Spirent Booth # 63 -- Spirent Communications plc (LSE: SPT), a global provider of performance analysis and service management solutions, today announced that it has been selected by AT4 wireless to provide RF channel emulation capability to AT4 wireless' WiMAX interoperability lab. The lab will use Spirent SR5500 Wireless Channel Emulators to test the interoperability between commercial WiMAX infrastructure and WiMAX mobile devices.

(Logo: http://www.newscom.com/cgi-bin/prnh/20080909/CLTU016LOGO )

AT4 wireless' lab is providing device interoperability testing for the most ambitious North American rollout of WiMAX services to date. "We know that this deployment will become a highly visible symbol of WiMAX's capabilities, so we've taken a very serious approach to evaluating all available test solutions required for our test lab to meet our customer demands and requirements," said Jose Aurelio Rodrigo, Chief Operating Officer of AT4 wireless, Inc. "Spirent's test equipment provides all the features necessary to evaluate complex interoperability scenarios including 4x4 MIMO and mobility, as well as the flexibility and modularity to adapt as our testing needs evolve."

"With the Spirent SR5500 having been adopted by leading WiMAX network operators, equipment manufacturers and technology providers, Spirent has already made significant contributions to the deployment of WiMAX in North America," said Rob Van Brunt, vice president and market segment leader at Spirent Communications Wireless division. "We're delighted to have been chosen by AT4 wireless for this phase of interoperability testing, so crucial to moving the technology forward. With our combined expertise in WiMAX technology we can provide an excellent test solution which will contribute to a successful rollout."

The Spirent SR5500 builds on more than a decade of wireless test leadership, providing highly accurate emulation of the transmission channel for receiver performance testing. Unlike technology-specific channel emulators, the Spirent SR5500 supports multiple emerging next-generation technologies. All relevant frequency bands are supported, including the new 700 MHz and 2.7 GHz bands. In addition to WiMAX, the advanced fading engine ensures accurate testing of other sophisticated technologies including HSPA, EV-DO and LTE.

Spirent is demonstrating performance capabilities of Spirent SR5000 at WIMAX World 2008 in Chicago, October 1 to October 2 at Booth # 632. For more information please visit www.spirent.com/go/SR5500.

About AT4 wireless

AT4 wireless, a global supplier of Testing Solutions for wireless technologies prides itself on being both, the most complete Wireless Certification & Testing Laboratory in the world and a leading manufacturer of cutting-edge test & measurement equipment for telecommunication technologies.

AT4 wireless, Inc.

AT4 wireless, Inc. is the first North America-based certification test laboratory, accredited by the WiMAX Forum in 2008. The lab is located in Herndon, Virginia, easy to access due to its vicinity to the Washington-Dulles International Airport.

AT4 wireless, Inc. conducts WiMAX Forum Certification Testing, including Radio and Protocol Conformance testing, Mobile Interoperability testing and Radiated Performance Testing (RPT). AT4 wireless is the first location worldwide to offer RPT Testing for WiMAX devices.

AT4 wireless was founded in 1991, has more than 350 employees and operates from its headquarter in Malaga/Spain and its U.S.-based branch in Herndon, VA.

For more information, visit www.at4wireless.com

All trademarks are the properties of their respective owners.

About Spirent Communications plc

Spirent Communications (www.spirent.com) is a global provider of integrated performance analysis and service assurance systems that enable the development and deployment of next-generation networking technology such as Internet telephony, broadband services, 3G wireless, global navigation satellite systems, and network security equipment. Spirent Communications' solutions are used by more than 1,700 customers in 30 countries, including the world's largest equipment manufacturers, service providers, enterprises and governments. Based in Sunnyvale, CA, Spirent Communications has 1,500 employees worldwide.

Spirent Communications plc Ordinary shares are traded on the London Stock Exchange (ticker: SPT). The Company operates a Level 1 American Depositary Receipt ("ADR") programme with each ADR representing four Spirent Communications plc Ordinary shares. The ADRs trade in the US over-the-counter ("OTC") market under the symbol SPMYY and the CUSIP number is 84856M209. Spirent Communications' sales to the United States government are made through Spirent Federal Systems Inc. www.spirentfederal.com

Spirent, Spirent Communications and the Spirent logo are trademarks or registered trademarks of Spirent Communications plc. All other trademarks or registered trademarks mentioned herein are held by their respective companies. All rights reserved.

Contact: Sailaja Tennati, Spirent Communications, Direct Tel +1-770-432-3225, E-mail sailaja.tennati@spirent.com; or Ed Sheehan, AT4 wireless, Inc.,Direct Tel +1-703-657-2014, E-mail esheehan@at4wirelessusa.com

This document may contain forward-looking statements which are made in good faith and are based on current expectations or beliefs, as well as assumptions about future events. You can sometimes, but not always, identify these statements by the use of a date in the future or such words as "will", "anticipate", "estimate", "expect", "project", "intend", "plan", "should", "may", "assume" and other similar words. By their nature, forward-looking statements are inherently predictive and speculative and involve risk and uncertainty because they relate to events and depend on circumstances that will occur in the future. You should not place undue reliance on these forward-looking statements, which are not a guarantee of future performance and are subject to factors that could cause our actual results to differ materially from those expressed or implied by these statements. The Company undertakes no obligation to update any forward-looking statements contained in this document, whether as a result of new information, future events or otherwise.

Web site: http://www.spirent.com http://www.at4wireless.com http://www.spirentfederal.com

Sailaja Tennati of Spirent Communications, +1-770-432 3225, sailaja.tennati@spirent.com; or Ed Sheehan of AT4 wireless, Inc., +1-703-657-2014, esheehan@at4wirelessusa.com; Photo: Newscom: http://www.newscom.com/cgi-bin/prnh/20080909/CLTU016LOGO, AP Archive: http://photoarchive.ap.org, PRN Photo Desk, photodesk@prnewswire.com