Acquisition

Spirent Communications PLC
10 July 2006


                           SPIRENT COMMUNICATIONS PLC
                                        
              ACQUISITION OF SCIENTIFIC SOFTWARE ENGINEERING, INC.

London, UK - 10 July 2006: Spirent Communications plc (LSE: SPT; NYSE: SPM), a
leading communications technology company, today announces that it has acquired
Scientific Software Engineering, Inc. ("SSE"), the US based developer of the
fast growing Landslide product, a leading software based system for testing the
performance and functionality of 2.5 and 3G wireless network infrastructure.

Spirent is paying an initial consideration of $10.0 million (£5.4 million),
payable in cash on completion with up to a further $6.0 million (£3.3 million)
payable depending on the satisfaction of certain technical milestones and the
retention of key employees.

SSE, based in Dallas, Texas and employing 24 people, will be incorporated within
Spirent's Performance Analysis division. Spirent has been re-selling the
Landslide product since November 2003 and customers include leading global
network equipment manufacturers and wireless operators.

The acquisition will allow Spirent to integrate the business and the technology
to deliver enhanced applications for the wireless infrastructure, IMS and
fixed-mobile convergence test markets, which have been identified as key growth
areas. Landslide revenues grew strongly in the first half of the year.


Anders Gustafsson, Chief Executive, commented:


"The acquisition is in line with our strategy to expand our communications
business, drive profitable growth and deliver shareholder value. We believe that
the Landslide product is a market-leading solution for wireless network
infrastructure testing and will also enhance our IMS portfolio."


                                    - ends -


Enquiries

Spirent Communications plc                                    [phone]
Anders Gustafsson, Cheif Executive                             
Eric Hutchinson, Chief Financial Officer

Smithfield
Reg Hoare/Katie Hunt                                         [phone]
                                                              


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About Spirent Communications plc

Spirent Communications plc is a leading communications technology company
focused on delivering innovative systems and services to meet the needs of
customers worldwide. We are a global provider of performance analysis and
service assurance solutions that enable the development and deployment of
next-generation networking technologies such as broadband services, Internet
telephony, 3G wireless and web applications and security testing. The Systems
group develops power control systems for specialist electrical vehicles in the
mobility and industrial markets. Further information about Spirent
Communications plc can be found at www.spirent.com.

Spirent Communications plc Ordinary shares are traded on the London Stock
Exchange (ticker: SPT) and on the New York Stock Exchange (ticker: SPM; CUSIP
number: 84856M209) in the form of American Depositary Shares ("ADS"),
represented by American Depositary Receipts, with one ADS representing four
Ordinary shares.

Spirent 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.

This press release may contain forward-looking statements that are based on
current expectations or beliefs, as well as assumptions about future events. By
their nature, forward-looking statements are inherently predictive, 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. These
risks include the risks described from time to time in Spirent Communications
plc's Securities and Exchange Commission periodic reports and filings. The
Company undertakes no obligation to update any forward-looking statements
contained in this press release, whether as a result of new information, future
events or otherwise.



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