Transaction in Own Shares

Spirent Communications PLC
03 October 2007

Spirent Communications plc: Transaction in own shares



Spirent Communications plc announces that it has today purchased through UBS
Limited 312,641 ordinary shares at an average price of 61.9 pence per share. The
highest price and the lowest price paid for these shares were 62.0 pence and
61.3 pence respectively.



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



Following the purchase of these shares, Spirent Communications plc holds
105,429,641 of its ordinary shares in treasury and has 859,609,675 ordinary
shares in issue (excluding treasury shares).  This figure 859,609,675 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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