Transaction in Own Shares

Spirent Communications PLC
24 September 2007


Spirent Communications plc: Transaction in own shares

Spirent Communications plc announces that it has today purchased through ABN 
AMRO Bank NV 1,000,000 ordinary shares at an average price of 61.19 pence per 
share. The highest price and the lowest price paid for these shares were 61.5 
pence and 59.75 pence respectively.

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

Following the purchase of these shares, Spirent Communications plc holds
100,382,000 of its ordinary shares in treasury and has 864,594,017 ordinary
shares in issue (excluding treasury shares). This figure (864,594,017)
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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