Transaction in Own Shares

Spirent Communications PLC
21 September 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 1,000,000 ordinary shares at an
average price of  47.888 pence per share. The highest price and the lowest price
paid for these shares were  48.75 pence and  47.25 pence respectively.



Following the above purchase, Spirent Communications plc holds 64,640,000
Spirent Communications plc ordinary shares in treasury, and has 907,468,262
Spirent Communications plc ordinary shares in issue (excluding treasury shares).




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