ADVISORY/ Spirent Demonstrations at Networld+Interop 2002, Las Vegas.

News & Assignment Editors

ADVISORY...Tuesday (May 7)

NetWorld+Interop 2002 Las Vegas

LAS VEGAS--(BUSINESS WIRE)--May 7, 2002

Spirent Communications(TM), a wholly owned business group of Spirent plc (NYSE:SPM), is a key contributor to many of the most innovative testbeds and demonstrations taking place at Networld+Interop 2002, in Las Vegas.

Spirent has a broad portfolio of technologies and products that simplify network equipment manufacturers' and service providers' test, evaluation and performance analysis functions during product development and pre-deployment evaluations, as well as assuring the ongoing performance in live networks and accelerating time to market and profit.

In addition to product demonstrations in the Spirent booth, the company's test solutions are widely deployed throughout the event - simulating real-world network conditions in the iLabs, the eNet, the 10 Gigabit Ethernet Alliance, and in several customer booths, including Foundry, Extreme and Brocade.

Who:   Spirent Communications

When:  May 6 through May 9, 2002 (during exhibit hours)

Where: Networld+Interop 2002, Las Vegas, Nevada. Booth #6089.

What:  Product demonstrations of the following Spirent test solutions:

      --  Metro Routing

          --  MPLS-VPN RFC-2547bis test solution, running in Spirent
            Connect

      --  Storage Networking

          --  FaST

          --  Fibre Channel IP Testing with impairments, featuring SMB
            FC and AX/4000 Gigabit Ethernet Network Impairment
            Emulator (GENIE)

      --  Broadband Access

          --  ATM on SMB 6000B Platform

          --  SMB PPP Capacity Assessment (SmartxDSL)

          --  TR-048

      --  VoIP

          --  Abacus2 SIP

          --  SmartVoIPQoS

      --  Optical

          --  OTA 4400

          --  AX/4000 Optical BERT (OPX-192)

      --  10GbE

          --  SMB XENPAK and LAN 3710

          --  AX/4000 Uni-PHY

      --  Wireless

          --  1xEVDO

      --  Web/Security

          --  TeraCaw

          --  TeraVPN

          --  WebSuite

      --  Web

          --  WebAvalanche

          --  WebReflector

      --  Service Assurance

          --  Sentry

          --  Perform

          --  React

Press and analysts are invited to visit Spirent Communications at Networld+Interop 2002, Las Vegas. Demonstrations of Spirent's latest test solutions will run during exhibit hours.

In addition, Spirent executives will be available to address specific questions at the booth. For appointments, please contact Cathi Lane, director of public relations, at 818/229-2229 or [e-mail]

This press release may contain forward-looking statements that are based on current expectations or beliefs, as well as assumptions about future events. You can identify these statements by their use of words such as "will," "anticipate," "estimate," "expect," "project," "intend," "plan," "should," "may," "assume" and other similar words. You should not place undue reliance on our 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. Such factors include: aggressive competition; our ability to develop and commercialize new products and services; risks relating to the acquisition or sale of businesses; our reliance on third party manufacturers and suppliers; our exposure to liabilities for product defects; our reliance on proprietary technology; our ability to grow in e-commerce; our ability to attract and retain qualified personnel; risks of doing business internationally; and risks of downturns in the industries in which we participate; and other risks described from time to time in Spirent plc's Securities and Exchange Commission periodic reports and filings. We undertake no obligation to update our forward-looking statements, whether as a result of new information, future events or otherwise.