Transaction in Own Shares

Spirent Communications PLC
10 January 2008


Spirent Communications plc: Transaction in own shares

Spirent Communications plc announces that it has today purchased through ABN
AMRO Bank NV 500,000 ordinary shares at an average price of 60.44 pence per
share. The highest price and the lowest price paid for these shares were 61
pence and 59.25 pence respectively.

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

Following the purchase of these shares, Spirent Communications plc holds
53,665,603 of its ordinary shares in treasury and has 787,131,215 ordinary
shares in issue (excluding treasury shares). This figure (787,131,215)
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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