Spirent Communications Expands International Distribution of NTAS.

Business Editors & Technology Writers

ATLANTA--(BUSINESS WIRE)--June 5, 2001

Spirent Communications(TM) (Booth No. 752) today announced the addition of three distributors to Net-HOPPER division's international sales unit.

Joining the Net-HOPPER team are Empowered Networks of Canada, Nihon Dynetcom KK of Japan, and Unitel of Korea.

Net-HOPPER Division president, Vince Dugan, said, "We're very pleased to join with these highly-respected companies to bring the power of Net-HOPPER's Network Test Access System (NTAS) to their customers. Today's networks are the central nervous systems of telecommunication and enterprise companies throughout the world and we've designed NTAS to maximize the uptime of these networks."

Spirent recently received its fourth patent for Net-HOPPER technologies supporting NTAS, which has become indispensable to several telecommunication companies, ISPs and ASPs. NTAS is comprised of the award-winning control software, PATHmaster, and Net-HOPPER's suite of matrix switches. Together, they enable remote access of traffic on any network segment, across all switches and routers, to protocol analyzers and remote monitoring (RMON) probes, which are permanently installed on the network. The permanent integration of analyzers into the system enables companies to better leverage their personnel and equipment.

NTAS provides Spirent customers with a global solution, which offers significant competitive advantages, the best price/performance value in the industry and enables them to avoid the prohibitive cost of downtime on large, mission-critical networks.

About Spirent Communications

Spirent Communications 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, Net-HOPPER, 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 the parent of Spirent Communications. Spirent is quoted on the London Stock Exchange, ticker SPT. The company operates a Level 1 American Depository Receipt program (ticker: SPNUY; CUSIP number: 84856M100). For information, contact Brian Heston, The Bank of New York, American Depository Receipts, 101 Barclay St, 22 West, New York, N.Y. 10286, phone [phone], fax [phone], e-mail: [e-mail], www.adrbny.com. 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.