Spirent Communications PLC announces Transaction in Own Shares

Crawley, UK -- (MARKET WIRE) -- October 16, 2006 --

Spirent Communications Plc
Transaction in Own Shares 

Spirent Communications PLC announces that it has today purchased through Citigroup Global Markets U.K. Equity Limited 3,500,000 ordinary shares at an average price of 60.1593 pence per share. The highest price and the lowest price paid for these shares were 60.25 pence and 59.25 pence respectively.

Following the above purchase, Spirent Communications plc holds 74,290,000 Spirent Communications plc ordinary shares in treasury, and has 898,751,073 Spirent Communications plc ordinary shares in issue (excluding treasury shares).

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