Transaction in Own Shares

Spirent Communications PLC
09 November 2007


Spirent Communications plc: Transaction in own shares

Spirent Communications plc announces that it has today purchased through ABN
AMRO Bank NV 2,350,000 ordinary shares  at an average price of 68.85 pence per
share. The highest price and the lowest price paid for these shares were  71.375
pence and 66.75 pence respectively.

Spirent Communications plc intends to hold the purchased shares in treasury.

Following the purchase of these shares, Spirent Communications plc holds
62,732,103 of its ordinary shares in  treasury and has 827,741,456 ordinary
shares in issue (excluding treasury shares). This figure (827,741,456)
represents  the total voting rights in the Company and may be used by
shareholders as the denominator for the calculations by which  they can
determine if they are required to notify their interest in, or a change to their
interest in, the Company  under the Financial Services Authority's Disclosure
and Transparency Rules.



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