Spirent Communications Establishes U.S. Company Focused On U.S. Department of Defense Contracts.

Business Editors

ROCKVILLE, M.D.--(BUSINESS WIRE)--Feb. 4, 2002

One of the world's largest providers of performance analysis and service assurance systems, Spirent Communications(TM), announced today the formation of a U.S. subsidiary, Global Secure Systems, to provide simulation system technology to the U.S. Department of Defense for analyzing and assuring Global Positioning System (GPS) receivers.

Spirent Communications, a wholly owned business group of Spirent plc (NYSE: SPM and LSE: SPT), established Global Secure Systems (GSS) under a proxy agreement with the U.S. Defense Security Service to enable the company to compete for U.S. government contracts requiring classified security clearances. GSS will provide global positioning simulators, including government-required modifications or enhancements, for evaluation of mission-critical GPS receivers. GSS also will support existing equipment for local and wide area network infrastructures, including Service Level Agreement (SLA) verification, through Spirent's Adtech and SmartBits product lines.

"Spirent has more than half of the GPS satellite simulator market worldwide, and its products are already firmly established in U.S. military qualification, certification, integration and production environments," said Steve Naylor, vice president of business development for GSS and previously government sales manager with Spirent Communications. "With Spirent's GPS simulation products, the U.S. military will be able to create different scenarios for tracking real-time positioning of all moving vehicles, including space vehicles. Overall, our products will be used for development, testing and evaluation of user equipment."

The management of GSS will be spear headed by a three-member team with more than 100 combined years of experience in U.S. security and defense operations. Ellen Hall, president and CEO, has more than 20 years experience in the aerospace industry, most recently as vice president of L-3 Communications' Interstate Electronics Corp. Former U.S. Secretary of the Navy Larry Garrett will serve as chairman of the board for the new company. Jack Devine, previously deputy director for technology and systems at the U.S. National Security Agency, will also sit on the company's board.

"The government's increased focus on secure telecommunications systems demands best-in-class products for simulation of global positioning systems," said Hall. "In the context of this specialized market, we will work with our customers to analyze their requirements and develop customized applications based on Spirent's technology. We look forward to producing a new line of simulators that will accelerate the development and deployment of GPS modernization, including M Code, the next generation of GPS."

More information about GSS and its offerings can be obtained at www.global-secure.com.

About Spirent Communications

Spirent Communications (www.spirentcom.com) unites the best in performance analysis technology with network operations expertise. The company's award-winning solutions enable customers to accelerate the development, deployment and assurance of next-generation network equipment and services worldwide.

Spirent Communications designs and manufactures Adtech, DLS, Edgcumbe, GSS, Hekimian, SmartBits, TAS and Zarak products. More than 2,500 of the world's leading network and terminal equipment manufacturers, network service providers, corporate enterprises and test laboratories rely on our first-to-market products to verify and measure the performance and services of networks and communications devices.

Spirent plc is listed on the London Stock Exchange (ticker: SPT). The company is also listed on the New York Stock Exchange through a Level 2 American Depository Receipt program, through which one ADR represents four Spirent shares (ticker: SPM; CUSIP number: 84856M209). Further information about Spirent plc can be found at www.spirent.com.

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

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